Enabling v4l2 driver in R24.1 by building Kernel from source code

How to enable v4l2 in the latest release 24.1

I followed the steps given in Tegra_Linux_Driver_Package_Documents_R24.1(Video for Linux User Guide)

In R23.2, After building the kernel from source code I had nvhost-vi.ko, ov5693_v4l2.ko, tegra_camera.ko files so that I can execute the below commands.

$ sudo rmmod nvhost-vi
$ sudo modprobe ov5693_v4l2
$ sudo modprobe tegra_camera

But in R24.1 I am not able to find these .ko files after following the same build procedure as R23.2.
I followed same steps because R24.1 documentation says so.
Only difference is that there was a patch to be applied for R23.2 and no patch for R24.1(according to documentation).

Is there any other build procedure for R24.1.
Could anybody please guide me regarding this…

I was able to see “/dev/video0” after install L4T 24.1 without patching or rebuilding kernel.

But when I started “cheese” I got “One or more needed G Streamer elements are missing: cluttervideosink.”

@yahoo2016

Yes, I’m also able to see “/dev/video0” by installing R24.1 sample root file system.

But v4l2src pipeline is not working. So I tried to rebuild the kernel following R24.1 documentation.

And I already commented about the issue I’m facing(Please see #1).

the document is not detail enough, there is a document to tell you how to build it and dissolved two little mistake you will encounter , such as r7 mistake and a long long logical expression.

you should choice the R23.2 instead of the old r23.1 version. during present i have n’t test the r24.1 version.
thanks to this document and my colleague, i have dissolved it.

https://developer.ridgerun.com/wiki/index.php?title=Compiling_Tegra_X1_source_code#Flashing_the_board

the step, run the apply_binaries.sh is very very important

Hi Chenghaibo

The link that you have given here is by David.
I followed the steps given by him while building R23.2

Now I want to test v4l2 with R24.1

Could you please give me updates after you test the R24.1 version.

Thanks in advance.

Hi,

I have the same problem here. I see “/dev/video0” but yavta is unable to get images from the sensor successfully.

Details:
I followed the instructions at http://developer.download.nvidia.com/embedded/L4T/r24_Release_v1.0/24.1_64bit/t210ref_release_aarch64/l4t_quick_start_guide.txt?autho=1464301278_d35ba83913060615e064aa1467c19cd8&file=l4t_quick_start_guide.txt to install L4T 24.1 on my Tx1 dev kit and I’m able to see “/dev/video0” without patching or rebuilding the kernel.

The “Video for Linux User Guide” section of the docs (http://developer.nvidia.com/embedded/dlc/l4t-documentation-24-1) mentions instructions to follow to enable v4l2 for R23.x but nothing for R24.1 other than the soc_camera driver being deprecated in favor of the media-controller driver.

I tried running the yavta tool as mentioned in the docs but something seems to be failing. The tool takes 4 seconds to grab a frame and outputs a large zeroed out file. The output of dmesg below says that we’re hitting syncpt timeouts. I may be wrong but if I understand things correctly it means the host1x DMA engine is not being programmed correctly and hitting sync issues.

[70324.794839] video4linux video0: frame start syncpt timeout!
[70324.800680] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0x00000000
[70324.807455] vi vi: TEGRA_CSI_PIXEL_PARSER_STATUS 0x00000000
[70324.807577] vi vi: TEGRA_CSI_CIL_STATUS 0x00000010
[70324.807772] vi vi: TEGRA_CSI_CILX_STATUS 0x00040041
[70326.795297] video4linux video0: MW_ACK_DONE syncpoint time out!
[70326.841341] vi vi: TEGRA_CSI_PIXEL_PARSER_STATUS 0x00000000
[70326.841354] vi vi: TEGRA_CSI_CIL_STATUS 0x00000010
[70326.841362] vi vi: TEGRA_CSI_CILX_STATUS 0x00040041

Is this a bug or do we need to do something special to get a working v4l2 driver on the Tx1 dev kit?

Thank you very much

Hi

While building source code of R24.1 according to documentation I’m able to generate ov5693_v4l2.ko

But tegra_camera.ko is not generated.

To activate v4l2 I need both .ko files. Somebody please help me.

Please see part of build log

hafx@hafx:~/Raja/kernel_sources$ make modules_install INSTALL_MOD_PATH=/home/hafx/Raja/kernel_sources/Modules
  INSTALL block/cfq-iosched.ko
  INSTALL block/deadline-iosched.ko
  INSTALL crypto/md4.ko
  INSTALL drivers/bluetooth/hci_uart.ko
  INSTALL drivers/media/i2c/soc_camera/ov5693_v4l2.ko
  INSTALL drivers/media/platform/tegra/vi/nvhost-vi.ko
  INSTALL drivers/media/usb/gspca/gspca_main.ko
  INSTALL drivers/misc/bluedroid_pm.ko
  INSTALL drivers/net/wireless/bcmdhd/bcmdhd.ko
  INSTALL drivers/net/wireless/iwlwifi/dvm/iwldvm.ko
  INSTALL drivers/net/wireless/iwlwifi/iwlwifi.ko
  INSTALL drivers/net/wireless/iwlwifi/mvm/iwlmvm.ko
  INSTALL drivers/usb/gadget/g_audio.ko
  INSTALL drivers/usb/gadget/g_ether.ko
  INSTALL drivers/usb/gadget/g_mass_storage.ko
  INSTALL drivers/usb/gadget/libcomposite.ko
  INSTALL drivers/usb/serial/baseband_usb_chr.ko
  INSTALL drivers/video/backlight/lcd.ko
  INSTALL fs/cifs/cifs.ko
  INSTALL net/bluetooth/bnep/bnep.ko
  INSTALL net/bluetooth/rfcomm/rfcomm.ko
  INSTALL net/mac80211/mac80211.ko
  INSTALL net/wireless/cfg80211.ko
  MKDIR   Modules/lib/firmware/tigon
  INSTALL Modules/lib/firmware/tigon/tg3.bin
  INSTALL Modules/lib/firmware/tigon/tg3_tso.bin
  INSTALL Modules/lib/firmware/tigon/tg3_tso5.bin
  DEPMOD  3.10.96+
hafx@hafx:~/Raja/kernel_sources$ grep -rni "tegra_camera.ko" *
Modules/lib/modules/3.10.96+/modules.builtin:209:kernel/drivers/media/platform/soc_camera/tegra_camera/tegra_camera.ko
drivers/media/platform/soc_camera/modules.builtin:3:kernel/drivers/media/platform/soc_camera/tegra_camera/tegra_camera.ko
drivers/media/platform/soc_camera/tegra_camera/modules.builtin:1:kernel/drivers/media/platform/soc_camera/tegra_camera/tegra_camera.ko
drivers/media/platform/modules.builtin:3:kernel/drivers/media/platform/soc_camera/tegra_camera/tegra_camera.ko
drivers/media/modules.builtin:9:kernel/drivers/media/platform/soc_camera/tegra_camera/tegra_camera.ko
drivers/modules.builtin:163:kernel/drivers/media/platform/soc_camera/tegra_camera/tegra_camera.ko
modules.builtin:209:kernel/drivers/media/platform/soc_camera/tegra_camera/tegra_camera.ko
h

From what I’ve seen, the V4L2 section in the L4T 24.1 documentation is out of date and still describes how things were done with R23.x. The camera-related kernel configuration in 24.1 is quite different.

Try starting with the .config file that comes in the R24.1 kernel-headers tarball. It configures in the right ov5693 driver (CONFIG_VIDEO_I2C_OV5693) and the newer V4L2-based camera support (CONFIG_VIDEO_TEGRA_VI). Those drivers are built-ins in that configuration, not modules, btw. The new V4L2 driver does work with nvgstcapture and the nvcamerasrc gstreamer plug-in.

The “V4L2_Sensor_Driver_Programming_Guide_v4.0.pdf” file that’s included in the doc package looks to be up-to-date with the current design, but unfortunately doesn’t provide any details on how to get the configuration exactly right.

FWIW, I’m facing the same issue. No instructions on how to make the ov5693 v4l2 work in R24.1, the 24.1 docs only talk about 23.2.

It is not clear if it will work using media controller or soc_camera, only that soc_camera is being deprecated. I know both drivers are in the source (drivers/media/i2c/ov5693.c and drivers/media/i2c/soc_camera/ov5693_v4l2.c), and I don’t mind which one works and which one doesn’t, as long as one of them works, so that I can make custom drivers work using it as an example.

In addition, the device tree was significantly changed (with respect to video input), and it is not clear what needs to be done in order to add a new device, or even make the ov5693 work with, say, yavta.

It is also not clear what needs to be enabled/disabled in the .config file.

Furthermore, besides providing a recipe that works, some explanation of why such things are being done would go a long way in helping figuring things out on our own in the future, instead of having to ask every time any little change is made and any given recipe no longer works verbatim.

An updated document is inside the L4T 24.1 documentation package, linked at http://developer.nvidia.com/embedded/dlc/l4t-documentation-24-1

When you extract the .tar file from the link and navigate to [extracted directory]/nvl4t_docs/Tegra Linux Driver Package Development Guide/baggage/ there is a PDF called “V4L2_Sensor_Driver_Programming_Guide_v4.0.pdf”, which should answer many of these questions.

Apologies for the confusion, we are looking into making this document more visible.

Is it too much to expect that after a clean installation of R24.1, cheese should just work with /dev/video0? What kind of QA process lets such a glaring problem slip?

[quote]

The document keeps talking about R23.1. It provides NO information about R24.1.

A few clarification here,

. The default OV5693 camera is bayer format sensor. You could use NV nvgstcapture-1.0 (under /usr/bin and source also available) to perform capture function. It will use Tegra ISP function as the capture is a raw image. This is described in the first section of SCF user mode data path of V4L2 Sensor Driver programming Guide.

Without going through ISP, it won’t be human consumable image. This will be the case for standard V4L2-based application as v4l2 capture won’t have Tegra ISP support and the image is raw data.

. To use standard v4l2 application, you could use YUV camera module by writing your own media controller sensor driver (such as some of the Omnivision YUV camera sensor). Again above default bayer camera won’t have this data pass. One thing to note is, with this YUV sensor driver, you will need to configure V4L2 media controller driver as VI non-bypass mode which I will cover at the very end of my comment about documentation.

. From r23.2 to r24.1, there is slight camera driver model changes - we revamp nvhost-vi (bypass) driver and v4l2 soc_camera (non-bypass) driver into one v4l2 media controller driver model. That’s why nvhost-vi driver is gone for r24.1. Tegra-camera driver is used for loadable v4l2 driver to support both L4T and Android. But using one media controller driver, there is no more need for it. So it’s gone for r24.1 too.

. if cheese use gstreamer framework, it should work for default camera but might not be accelerated by TX1 unless you use NV gstreamer plug-in components. Can refer to Multimedia User Guide for details. If cheese uses standard v4l2 IOCtl, you won’t be able to use it with default bayer camera.

We can explore the missing cluttervideosink error message if you could provide us more details.

. As for r24.1 documentation confusion, we will review, clarify and update both ‘Video for Linux User Guide’ and ‘V4L2 Sensor Driver Programming Guide’ ASAP. Thanks for your patience.

How much more detail than “load the 24.1 release, see that /dev/video0 exists, but cheese and vlc doesn’t work” do you need? Did you do that? Does it work for you?

I can see the same error message using cheese. We are looking into it now. It should not be due to v4l2 media controller driver.

  1. I have downloaded and compiled L4T24.1 with minor compiler fixes only.

  2. After reflashing Tegra X1 I see both nvhost_vi and ov5693 modules loaded:

~$ lsmod

Module                  Size  Used by
bcmdhd               7453369  0 
soc_camera             19779  0 
rfcomm                 65174  0 
soc_mediabus            4805  1 soc_camera
videobuf_core          20066  1 soc_camera
cfg80211              449494  1 bcmdhd
bnep                   14520  2 
ov5693                 27234  1 
nvhost_vi               5592  0 
bluedroid_pm           11244  0
  1. Executing gstreamer pipeline with nvcamerasrc works fine generating video on the desktop. But that’s not we need. We need in future to attach some CSI device with parameters other than supported by nvcamerasrc. So for now we stick with the default camera OV5693.

  2. Executing gstreamer pipeline with v4l2 generates strange warnings and after several seconds the device becomes irresponsible (extremely slow leading to irresponsiveness):
    ~# gst-launch-1.0 -e
    v4l2src device="/dev/video0"
    ! “video/x-raw, width=(int)640, height=(int)480, format=(string)I420”
    ! xvimagesink

[  106.640099] video4linux video0: frame start syncpt timeout!
[  106.645842] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0x00000000
[  108.649114] video4linux video0: MW_ACK_DONE syncpoint time out!
[  108.649170] video4linux video0: frame start syncpt timeout!
[  108.649174] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0x00000000
[  110.649652] video4linux video0: frame start syncpt timeout!
[  110.655704] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0x00000000
[  110.669824] video4linux video0: MW_ACK_DONE syncpoint time out!
[  112.669835] video4linux video0: MW_ACK_DONE syncpoint time out!
[  112.739093] video4linux video0: frame start syncpt timeout!
[  113.247170] Host read timeout at address 54080384
[  113.254895] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0xffffffff
[  114.266664] Host read timeout at address 54081054
[  115.239791] video4linux video0: MW_ACK_DONE syncpoint time out!
[  116.259829] video4linux video0: frame start syncpt timeout!
[  116.768685] Host read timeout at address 54080384
[  116.772536] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0xffffffff
[  118.282023] video4linux video0: MW_ACK_DONE syncpoint time out!
[  124.898566] Host read timeout at address 542400e0
[  125.401699] video4linux video0: frame start syncpt timeout!
[  125.904554] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0xffffffff
[  129.927031] Host write timeout at address 54241c20
[  129.929165] video4linux video0: MW_ACK_DONE syncpoint time out!
[  130.431682] video4linux video0: frame start syncpt timeout!
[  130.934194] video4linux video0: TEGRA_VI_CSI_ERROR_STATUS 0xffffffff
[  133.455969] Host read timeout at address 542400e0
[  133.456068] video4linux video0: MW_ACK_DONE syncpoint time out!
[  133.466573] Host write timeout at address 542400e0
[  134.476442] Host write timeout at address 542400e0
  1. Any attempt to rmmod nvhost_vi leads to kernel NULL pointer crash:

ubuntu@tegra-ubuntu:~$ sudo rmmod nvhost_vi

[  123.121931] Unable to handle kernel NULL pointer dereference at virtual address 000000a8
[  123.130154] pgd = ffffffc0fae5d000
[  123.133553] [000000a8] *pgd=0000000000000000
[  123.137830] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[  123.143390] Enter nvdumper_crash_setup_regs
[  123.147600] nvdumper: all registers are saved.
[  123.147611] nvdumper: all registers are saved.
[  123.147615] nvdumper: all registers are saved.
[  123.160897] nvdumper: all registers are saved.
[  123.165330] Modules linked in: bcmdhd soc_camera rfcomm soc_mediabus videobuf_core cfg80211 bnep ov5693 nvhost_vi(-) bluedrm
[  123.177076] CPU: 0 PID: 1545 Comm: rmmod Not tainted 3.10.96-urcpi-1.0.3a+ #11
[  123.184283] task: ffffffc0f50ae5c0 ti: ffffffc0e3450000 task.ti: ffffffc0e3450000
[  123.191756] PC is at mutex_lock+0x24/0x60
[  123.195756] LR is at mutex_lock+0x24/0x60
[  123.199756] pc : [<ffffffc000a96618>] lr : [<ffffffc000a96618>] pstate: 60000145
[  123.207134] sp : ffffffc0e3453b60
[  123.210440] x29: ffffffc0e3453b60 x28: ffffffc0e3450000 
[  123.215759] x27: ffffffc0010f8000 x26: 000000000000006a 
[  123.221076] x25: ffffffc0fa88a858 x24: ffffffc0fafbc520 
[  123.226394] x23: ffffffc00130e098 x22: ffffffc00130e094 
[  123.231712] x21: ffffffc0fa492980 x20: ffffffc0fa492980 
[  123.237032] x19: 00000000000000a8 x18: a000540e53e8eec0 
[  123.242352] x17: 80880080002300c4 x16: ffffffc0fdc89740 
[  123.247669] x15: ffffffc0fdc89780 x14: ffffffc0fdc897c0 
[  123.252989] x13: ffffffc0fdc89800 x12: 0000000000000027 
[  123.258307] x11: 0000000000000011 x10: ffffffc0fdc898c0 
[  123.263626] x9 : ffffffc0fdc89b00 x8 : fffffffffc3fffff 
[  123.268947] x7 : 3f05a6f29a46fe03 x6 : ffffffc0012b9ea8 
[  123.274264] x5 : ffffffc0e3450000 x4 : 0000000000000000 
[  123.279582] x3 : 0000000000000000 x2 : 0000000000000140 
[  123.284901] x1 : 000000000000005f x0 : ffffffc000ef8b98 
[  123.290222] 
[  123.290222] PC: 0xffffffc000a96598:
[  123.295175] 6598  97d8d4d0 17ffff91 910123a1 aa1503e0 97d8ef8c 17ffffb8 b9400260 7100041f
[  123.303419] 65b8  54fff360 17fffff9 910123a1 aa1503e0 97d8ef84 17ffffb5 b9400260 7100041f
[  123.311665] 65d8  54ffff41 17ffff92 a94153f3 a9425bf5 a94363f7 a8c67bfd d65f03c0 a9be7bfd
[  123.319912] 65f8  910003fd f9000bf3 aa0003f3 52800002 52800be1 d0002300 912e6000 97d915b7
[  123.328157] 6618  885f7e60 51000400 8801fe60 35ffffa1 d5033bbf 36f80060 aa1303e0 97ffff5a
[  123.336404] 6638  910003e0 9272c400 f9400800 f9000e60 f9400bf3 a8c27bfd d65f03c0 a9be7bfd
[  123.344650] 6658  910003fd a90153f3 aa0003f3 91001014 aa1403e0 940008b7 aa1303e0 52800021
[  123.352895] 6678  b8008401 f9400661 eb00003f 54000060 f9400820 97d92b88 aa1403e0 940009b2
[  123.361142] 
[  123.361142] LR: 0xffffffc000a96598:
[  123.366095] 6598  97d8d4d0 17ffff91 910123a1 aa1503e0 97d8ef8c 17ffffb8 b9400260 7100041f
[  123.374342] 65b8  54fff360 17fffff9 910123a1 aa1503e0 97d8ef84 17ffffb5 b9400260 7100041f
[  123.382585] 65d8  54ffff41 17ffff92 a94153f3 a9425bf5 a94363f7 a8c67bfd d65f03c0 a9be7bfd
[  123.390830] 65f8  910003fd f9000bf3 aa0003f3 52800002 52800be1 d0002300 912e6000 97d915b7
[  123.399076] 6618  885f7e60 51000400 8801fe60 35ffffa1 d5033bbf 36f80060 aa1303e0 97ffff5a
[  123.407325] 6638  910003e0 9272c400 f9400800 f9000e60 f9400bf3 a8c27bfd d65f03c0 a9be7bfd
[  123.415570] 6658  910003fd a90153f3 aa0003f3 91001014 aa1403e0 940008b7 aa1303e0 52800021
[  123.423815] 6678  b8008401 f9400661 eb00003f 54000060 f9400820 97d92b88 aa1403e0 940009b2
[  123.432061] 
[  123.432061] SP: 0xffffffc0e3453ae0:
[  123.437012] 3ae0  fa492980 ffffffc0 fa492980 ffffffc0 0130e094 ffffffc0 0130e098 ffffffc0
[  123.445257] 3b00  fafbc520 ffffffc0 fa88a858 ffffffc0 0000006a 00000000 010f8000 ffffffc0
[  123.453503] 3b20  e3450000 ffffffc0 e3453b60 ffffffc0 00a96618 ffffffc0 e3453b60 ffffffc0
[  123.461749] 3b40  00a96618 ffffffc0 60000145 00000000 e3453b60 ffffffc0 00a96618 ffffffc0
[  123.469997] 3b60  e3453b80 ffffffc0 002af054 ffffffc0 fe1fa0c0 ffffffc0 0008bd98 ffffffc0
[  123.478244] 3b80  e3453bc0 ffffffc0 0041dae8 ffffffc0 fe1fa0c0 ffffffc0 fed50000 ffffffc0
[  123.486488] 3ba0  fed50058 ffffffc0 e3453c60 ffffffc0 0000000a 00000000 fafbc520 ffffffc0
[  123.494736] 3bc0  e3453bf0 ffffffc0 0041dba0 ffffffc0 01137420 ffffffc0 fe1fa0c0 ffffffc0
[  123.502985] 
[  123.502985] X0: 0xffffffc000ef8b18:
[  123.507937] 8b18  6f6c635f 6e5f6b63 736f6e61 7065656c 00000000 00000000 6e72656b 6b2f6c65
[  123.516182] 8b38  65726874 632e6461 00000000 00000000 7268746b 64646165 00000000 00000000
[  123.524427] 8b58  6e72656b 702f6c65 7869736f 7570632d 6d69742d 2e737265 00000063 00000000
[  123.532673] 8b78  54523601 74615720 6f646863 69542067 756f656d 25203a74 64255b73 00000a5d
[  123.540917] 8b98  6e72656b 6d2f6c65 78657475 0000632e 6e72656b 682f6c65 6d697472 632e7265
[  123.549165] 8bb8  00000000 00000000 6f433401 20646c75 20746f6e 74697773 74206863 6968206f
[  123.557409] 8bd8  72206867 6c6f7365 6f697475 6f6d206e 6f206564 5043206e 64252055 0000000a
[  123.565654] 8bf8  72683601 656d6974 725f7372 6d757365 20292865 6c6c6163 77206465 20687469
[  123.573903] 
[  123.573903] X5: 0xffffffc0e344ff80:
[  123.578854] ff80  a9425bf5 a94363f7 a9446bf9 a94573fb a8cf7bfd d65f03c0 b00000e1 9101e021
[  123.587101] ffa0  38604822 10000063 8b228862 d61f0040 f941ba60 97ffb2b7 17ffffd5 aa1303e0
[  123.595345] ffc0  97fffe44 17ffffe9 79475661 79475e60 52801bc2 0a000020 0a020000 1ad82800
[  123.603591] ffe0  3607f840 93407f00 b00000e1 8b000400 91026021 8b000c20 b9408fa8 39404017
[  123.611837] 0000  00000008 00000000 ffffffff ffffffff f50ae5c0 ffffffc0 000bc344 ffffffc0
[  123.620082] 0020  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.628325] 0040  00000000 00000000 00000002 00000000 00000100 00000000 57ac6e9d 00000000
[  123.636574] 0060  0000004c 0000730c f7fcfab8 00000424 005a8604 a00e4200 1e289d01 1d0d4222
[  123.644822] 
[  123.644822] X6: 0xffffffc0012b9e28:
[  123.649775] 9e28  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.658022] 9e48  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.666265] 9e68  00000000 00000000 00000000 00000000 01262cf0 ffffffc0 0000000f 00000000
[  123.674513] 9e88  0000000f 00000000 00020002 00000000 01149420 ffffffc0 00000000 00000000
[  123.682761] 9ea8  0000000f 00000000 00000000 00000000 0000000f 00000000 00000000 00000000
[  123.691008] 9ec8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.699254] 9ee8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 0000122f
[  123.707500] 9f08  00000021 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.715746] 
[  123.715746] X8: 0xfffffffffc3fff7f:
[  123.720697] ff7c  ******** ******** ******** ******** ******** ******** ******** ********
[  123.728950] ff9c  ******** ******** ******** ******** ******** ******** ******** ********
[  123.737201] ffbc  ******** ******** ******** ******** ******** ******** ******** ********
[  123.745451] ffdc  ******** ******** ******** ******** ******** ******** ******** ********
[  123.753702] fffc  ******** ******** ******** ******** ******** ******** ******** ********
[  123.761957] 001c  ******** ******** ******** ******** ******** ******** ******** ********
[  123.770204] 003c  ******** ******** ******** ******** ******** ******** ******** ********
[  123.778457] 005c  ******** ******** ******** ******** ******** ******** ******** ********
[  123.786711] 007c  ******** ******** ******** ******** ******** ******** ******** ********
[  123.794962] 
[  123.794962] X9: 0xffffffc0fdc89a80:
[  123.799914] 9a80  30302d36 762d3633 00006669 00000000 00000000 00000000 00000000 00000000
[  123.808163] 9aa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.816407] 9ac0  f9d4a000 ffffffc0 fdc89b80 ffffffc0 0041dbb4 ffffffc0 fe1fa0c0 ffffffc0
[  123.824657] 9ae0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.832907] 9b00  30302d36 762d3633 00616e61 00000000 00000000 00000000 00000000 00000000
[  123.841157] 9b20  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.849401] 9b40  30302d36 762d3633 00616e61 00000000 00000000 00000000 00000000 00000000
[  123.857646] 9b60  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.865898] 
[  123.865898] X10: 0xffffffc0fdc89840:
[  123.870937] 9840  00100100 dead0000 00200200 dead0000 fdc898c0 ffffffc0 fa8c70c0 ffffffc0
[  123.879184] 9860  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.887432] 9880  00100100 dead0000 00200200 dead0000 00000000 00000000 fa8c7240 ffffffc0
[  123.895681] 98a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.903928] 98c0  00100100 dead0000 00200200 dead0000 fdc89900 ffffffc0 fa8c7180 ffffffc0
[  123.912177] 98e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.920421] 9900  00100100 dead0000 00200200 dead0000 fdc89940 ffffffc0 fa8c7480 ffffffc0
[  123.928672] 9920  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.936924] 
[  123.936924] X13: 0xffffffc0fdc89780:
[  123.941963] 9780  00100100 dead0000 00200200 dead0000 fdc89800 ffffffc0 f9d49d40 ffffffc0
[  123.950211] 97a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.958458] 97c0  00100100 dead0000 00200200 dead0000 fdc89840 ffffffc0 f9d49e00 ffffffc0
[  123.966710] 97e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.974958] 9800  00100100 dead0000 00200200 dead0000 fdc89880 ffffffc0 f9d49ec0 ffffffc0
[  123.983208] 9820  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  123.991455] 9840  00100100 dead0000 00200200 dead0000 fdc898c0 ffffffc0 fa8c70c0 ffffffc0
[  123.999702] 9860  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.007949] 
[  124.007949] X14: 0xffffffc0fdc89740:
[  124.012988] 9740  00100100 dead0000 00200200 dead0000 fdc897c0 ffffffc0 fafe2000 ffffffc0
[  124.021238] 9760  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.029489] 9780  00100100 dead0000 00200200 dead0000 fdc89800 ffffffc0 f9d49d40 ffffffc0
[  124.037737] 97a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.045987] 97c0  00100100 dead0000 00200200 dead0000 fdc89840 ffffffc0 f9d49e00 ffffffc0
[  124.054239] 97e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.062483] 9800  00100100 dead0000 00200200 dead0000 fdc89880 ffffffc0 f9d49ec0 ffffffc0
[  124.070733] 9820  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.078982] 
[  124.078982] X15: 0xffffffc0fdc89700:
[  124.084021] 9700  00100100 dead0000 00200200 dead0000 fdc89780 ffffffc0 fab47000 ffffffc0
[  124.092271] 9720  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.100515] 9740  00100100 dead0000 00200200 dead0000 fdc897c0 ffffffc0 fafe2000 ffffffc0
[  124.108761] 9760  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.117010] 9780  00100100 dead0000 00200200 dead0000 fdc89800 ffffffc0 f9d49d40 ffffffc0
[  124.125259] 97a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.133501] 97c0  00100100 dead0000 00200200 dead0000 fdc89840 ffffffc0 f9d49e00 ffffffc0
[  124.141749] 97e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.149996] 
[  124.149996] X16: 0xffffffc0fdc896c0:
[  124.155036] 96c0  00100100 dead0000 00200200 dead0000 fdc89740 ffffffc0 f9d49c80 ffffffc0
[  124.163283] 96e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.171531] 9700  00100100 dead0000 00200200 dead0000 fdc89780 ffffffc0 fab47000 ffffffc0
[  124.179779] 9720  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.188028] 9740  00100100 dead0000 00200200 dead0000 fdc897c0 ffffffc0 fafe2000 ffffffc0
[  124.196276] 9760  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.204519] 9780  00100100 dead0000 00200200 dead0000 fdc89800 ffffffc0 f9d49d40 ffffffc0
[  124.212765] 97a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.221015] 
[  124.221015] X20: 0xffffffc0fa492900:
[  124.226054] 2900  00004580 00000e0a 1001010c 00005187 00000eac 00000508 00000000 000a000a
[  124.234302] 2920  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000e68 000041c6 00000000 00000000
[  124.242551] 2940  fa492940 ffffffc0 fa492940 ffffffc0 fa492a20 ffffffc0 fa492a20 ffffffc0
[  124.250798] 2960  fa492960 ffffffc0 fa492960 ffffffc0 fa4937e0 ffffffc0 001ab0d8 ffffffc0
[  124.259045] 2980  00100088 00000008 00000000 00000000 00000000 00000000 ff988b00 ffffffc0
[  124.267294] 29a0  b3ac2104 0000000a fa4929b8 ffffffc0 00000000 00000000 30302d36 762d3633
[  124.275540] 29c0  00006669 0000049e 1000000c 00005598 000006ac 00000528 00000000 00170017
[  124.283787] 29e0  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000e40 00004566 00000000 00000000
[  124.292036] 
[  124.292036] X21: 0xffffffc0fa492900:
[  124.297074] 2900  00004580 00000e0a 1001010c 00005187 00000eac 00000508 00000000 000a000a
[  124.305322] 2920  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000e68 000041c6 00000000 00000000
[  124.313569] 2940  fa492940 ffffffc0 fa492940 ffffffc0 fa492a20 ffffffc0 fa492a20 ffffffc0
[  124.321816] 2960  fa492960 ffffffc0 fa492960 ffffffc0 fa4937e0 ffffffc0 001ab0d8 ffffffc0
[  124.330062] 2980  00100088 00000008 00000000 00000000 00000000 00000000 ff988b00 ffffffc0
[  124.338310] 29a0  b3ac2104 0000000a fa4929b8 ffffffc0 00000000 00000000 30302d36 762d3633
[  124.346561] 29c0  00006669 0000049e 1000000c 00005598 000006ac 00000528 00000000 00170017
[  124.354811] 29e0  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000e40 00004566 00000000 00000000
[  124.363059] 
[  124.363059] X22: 0xffffffc00130e014:
[  124.368097] e014  ffffffc0 fe481800 ffffffc0 fe4818c0 ffffffc0 fe481980 ffffffc0 fe481a40
[  124.376346] e034  ffffffc0 00000000 00000000 00000000 00000000 00000000 00000000 fe4815c0
[  124.384594] e054  ffffffc0 fe479440 ffffffc0 fe479500 ffffffc0 fe481680 ffffffc0 000004eb
[  124.392845] e074  000004eb f7b463f0 ffffffc0 f7b463f0 ffffffc0 fc8ac800 ffffffc0 00000001
[  124.401094] e094  00002f4d ffc3e9a0 ffffffc0 ff0ea740 ffffffc0 fe479380 ffffffc0 fc8ac000
[  124.409341] e0b4  ffffffc0 00000000 00000000 01118830 ffffffc0 00000000 00000000 00010001
[  124.417593] e0d4  00000000 00000000 00000000 00000000 00000001 00200000 00000000 f6000000
[  124.425842] e0f4  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.434093] 
[  124.434093] X23: 0xffffffc00130e018:
[  124.439132] e018  fe481800 ffffffc0 fe4818c0 ffffffc0 fe481980 ffffffc0 fe481a40 ffffffc0
[  124.447382] e038  00000000 00000000 00000000 00000000 00000000 00000000 fe4815c0 ffffffc0
[  124.455632] e058  fe479440 ffffffc0 fe479500 ffffffc0 fe481680 ffffffc0 000004eb 000004eb
[  124.463882] e078  f7b463f0 ffffffc0 f7b463f0 ffffffc0 fc8ac800 ffffffc0 00000001 00002f4d
[  124.472132] e098  ffc3e9a0 ffffffc0 ff0ea740 ffffffc0 fe479380 ffffffc0 fc8ac000 ffffffc0
[  124.480382] e0b8  00000000 00000000 01118830 ffffffc0 00000000 00000000 00010001 00000000
[  124.488633] e0d8  00000000 00000000 00000000 00000001 00200000 00000000 f6000000 00000000
[  124.496881] e0f8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.505127] 
[  124.505127] X24: 0xffffffc0fafbc4a0:
[  124.510166] c4a0  00000001 00000000 fafbc4a8 ffffffc0 fafbc4a8 ffffffc0 00000000 00000000
[  124.518416] c4c0  00000000 00000000 00000000 00000000 ff22a010 ffffffc0 00000000 00000000
[  124.526659] c4e0  fe1f0440 ffffffc0 011b1f40 ffffffc0 00000000 00000000 00000001 00000000
[  124.534904] c500  fbafb418 ffffffc0 fafbc040 ffffffc0 fafbc510 ffffffc0 fafbc510 ffffffc0
[  124.543155] c520  fafbc520 ffffffc0 fafbc520 ffffffc0 00100100 dead0000 00200200 dead0000
[  124.551399] c540  006c4d24 ffffffc0 006c52f4 ffffffc0 00000000 00000000 fe1f8bd8 ffffffc0
[  124.559646] c560  fe1f8bd8 ffffffc0 00000001 00000001 fafbc628 ffffffc0 fab4a818 ffffffc0
[  124.567896] c580  07300000 ffffff80 00000001 00000000 fafbc590 ffffffc0 fafbc590 ffffffc0
[  124.576146] 
[  124.576146] X25: 0xffffffc0fa88a7d8:
[  124.581184] a7d8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.589431] a7f8  00000000 00000000 f9d4a800 ffffffc0 e3453c60 ffffffc0 004d784c ffffffc0
[  124.597678] a818  fc011df0 ffffffbf f9d4a858 ffffffc0 fe6c0000 ffffffc0 fe6c0028 ffffffc0
[  124.605927] a838  fc00f0f0 ffffffbf 00b4c230 ffffffc0 00000000 00000000 f9d4a818 ffffffc0
[  124.614178] a858  00100100 dead0000 00200200 dead0000 00000000 00000000 00000002 00000000
[  124.622431] a878  fa88a918 ffffffc0 00020001 00000000 00000000 00000000 00000000 00010001
[  124.630679] a898  00010000 00000000 f9d4ae20 ffffffc0 f501cc00 ffffffc0 fc00f1a0 ffffffbf
[  124.638926] a8b8  00000000 00000000 00000000 00000000 00000051 00000001 00000000 00000000
[  124.647176] 
[  124.647176] X27: 0xffffffc0010f7f80:
[  124.652213] 7f80  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.660465] 7fa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.668711] 7fc0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.676958] 7fe0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.685202] 8000  001e3108 ffffffc0 001e3334 ffffffc0 001e3680 ffffffc0 001e37b8 ffffffc0
[  124.693452] 8020  001e39e4 ffffffc0 001babf0 ffffffc0 001badb4 ffffffc0 001baf78 ffffffc0
[  124.701699] 8040  001bb10c ffffffc0 001bb29c ffffffc0 001bb42c ffffffc0 001bb59c ffffffc0
[  124.709944] 8060  001bb724 ffffffc0 001bb8ac ffffffc0 001bba0c ffffffc0 001bbba8 ffffffc0
[  124.718192] 
[  124.718192] X28: 0xffffffc0e344ff80:
[  124.723231] ff80  a9425bf5 a94363f7 a9446bf9 a94573fb a8cf7bfd d65f03c0 b00000e1 9101e021
[  124.731478] ffa0  38604822 10000063 8b228862 d61f0040 f941ba60 97ffb2b7 17ffffd5 aa1303e0
[  124.739730] ffc0  97fffe44 17ffffe9 79475661 79475e60 52801bc2 0a000020 0a020000 1ad82800
[  124.747979] ffe0  3607f840 93407f00 b00000e1 8b000400 91026021 8b000c20 b9408fa8 39404017
[  124.756224] 0000  00000008 00000000 ffffffff ffffffff f50ae5c0 ffffffc0 000bc344 ffffffc0
[  124.764472] 0020  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  124.772723] 0040  00000000 00000000 00000002 00000000 00000100 00000000 57ac6e9d 00000000
[  124.780972] 0060  0000004c 0000730c f7fcfab8 00000424 005a8604 a00e4200 1e289d01 1d0d4222
[  124.789224] 
[  124.789224] X29: 0xffffffc0e3453ae0:
[  124.794263] 3ae0  fa492980 ffffffc0 fa492980 ffffffc0 0130e094 ffffffc0 0130e098 ffffffc0
[  124.802513] 3b00  fafbc520 ffffffc0 fa88a858 ffffffc0 0000006a 00000000 010f8000 ffffffc0
[  124.810765] 3b20  e3450000 ffffffc0 e3453b60 ffffffc0 00a96618 ffffffc0 e3453b60 ffffffc0
[  124.819010] 3b40  00a96618 ffffffc0 60000145 00000000 e3453b60 ffffffc0 00a96618 ffffffc0
[  124.827261] 3b60  e3453b80 ffffffc0 002af054 ffffffc0 fe1fa0c0 ffffffc0 0008bd98 ffffffc0
[  124.835511] 3b80  e3453bc0 ffffffc0 0041dae8 ffffffc0 fe1fa0c0 ffffffc0 fed50000 ffffffc0
[  124.843760] 3ba0  fed50058 ffffffc0 e3453c60 ffffffc0 0000000a 00000000 fafbc520 ffffffc0
[  124.852008] 3bc0  e3453bf0 ffffffc0 0041dba0 ffffffc0 01137420 ffffffc0 fe1fa0c0 ffffffc0
[  124.860257] 
[  124.861744] Process rmmod (pid: 1545, stack limit = 0xffffffc0e3450058)
[  124.868343] Stack: (0xffffffc0e3453b60 to 0xffffffc0e3454000)
[  124.874076] 3b60: e3453b80 ffffffc0 002af054 ffffffc0 fe1fa0c0 ffffffc0 0008bd98 ffffffc0
[  124.882236] 3b80: e3453bc0 ffffffc0 0041dae8 ffffffc0 fe1fa0c0 ffffffc0 fed50000 ffffffc0
[  124.890397] 3ba0: fed50058 ffffffc0 e3453c60 ffffffc0 0000000a 00000000 fafbc520 ffffffc0
[  124.898557] 3bc0: e3453bf0 ffffffc0 0041dba0 ffffffc0 01137420 ffffffc0 fe1fa0c0 ffffffc0
[  124.906717] 3be0: fe6c0028 ffffffc0 fafbc520 ffffffc0 e3453c10 ffffffc0 0041dbc4 ffffffc0
[  124.914877] 3c00: fdc89ac0 ffffffc0 fdc89b80 ffffffc0 e3453c20 ffffffc0 004d7de0 ffffffc0
[  124.923036] 3c20: e3453c70 ffffffc0 004d813c ffffffc0 fe6c0028 ffffffc0 fc011e98 ffffffbf
[  124.931197] 3c40: fbafa9c0 ffffffc0 fafbc4f8 ffffffc0 00000000 00000000 004d8128 ffffffc0
[  124.939357] 3c60: fa88a800 ffffffc0 fdc89680 ffffffc0 e3453c90 ffffffc0 004d40fc ffffffc0
[  124.947518] 3c80: fe6c0028 ffffffc0 fafbc4f8 ffffffc0 e3453cb0 ffffffc0 004d4164 ffffffc0
[  124.955677] 3ca0: fe6c0088 ffffffc0 fe6c0028 ffffffc0 e3453cd0 ffffffc0 006ae654 ffffffc0
[  124.963837] 3cc0: fafbc410 ffffffc0 fe6c0028 ffffffc0 e3453d20 ffffffc0 006c54f8 ffffffc0
[  124.971997] 3ce0: fafbc038 ffffffc0 0112d988 ffffffc0 ff22a000 ffffffc0 ff22a010 ffffffc0
[  124.980157] 3d00: 80000000 00000000 00000015 00000000 00000116 00000000 0112d988 ffffffc0
[  124.988316] 3d20: e3453d40 ffffffc0 006c2e78 ffffffc0 fafbc038 ffffffc0 00000015 00000000
[  124.996477] 3d40: e3453d60 ffffffc0 fc00776c ffffffbf fafbc018 ffffffc0 9ab6a132 00000000
[  125.004636] 3d60: e3453d90 ffffffc0 004d67fc ffffffc0 ff22a010 ffffffc0 fc007eb8 ffffffbf
[  125.012796] 3d80: ff22a070 ffffffc0 00000800 00000000 e3453db0 ffffffc0 004d40f4 ffffffc0
[  125.020956] 3da0: ff22a010 ffffffc0 fc007eb8 ffffffbf e3453dd0 ffffffc0 004d48e8 ffffffc0
[  125.029115] 3dc0: ff22a010 ffffffc0 fc007eb8 ffffffbf e3453e00 ffffffc0 004d3b8c ffffffc0
[  125.037275] 3de0: fc007eb8 ffffffbf c4a619b8 0000007f 00000000 00000000 00000001 ffffffc0
[  125.045436] 3e00: e3453e20 ffffffc0 004d5448 ffffffc0 fc007eb8 ffffffbf 0010bd04 ffffffc0
[  125.053595] 3e20: e3453e40 ffffffc0 004d688c ffffffc0 fc007f68 ffffffbf 00000800 00000000
[  125.061756] 3e40: e3453e50 ffffffc0 fc00781c ffffffbf e3453e60 ffffffc0 0010bd2c ffffffc0
[  125.069915] 3e60: c4a61390 0000007f 000853c8 ffffffc0 5878f4f0 00000055 c4a619b8 0000007f
[  125.078075] 3e80: ffffffff ffffffff 7bb5ea08 0000007f 60000000 00000000 6f68766e 765f7473
[  125.086236] 3ea0: 00000069 00000000 000853c8 ffffffc0 c4a60360 0000007f 00085470 ffffffc0
[  125.094397] 3ec0: 5878f4f0 00000055 c4a603b0 0000007f 5878f550 00000055 00000800 00000000
[  125.102557] 3ee0: 00000a00 00000000 00002002 00000000 7bbcae58 0000007f c4a60339 0000007f
[  125.110718] 3f00: 7bb08714 0000007f 919c999a ffffff8b 0000006a 00000000 99999999 19999999
[  125.118878] 3f20: ffffffff 00000000 00000000 00000000 00000005 00000000 ffffffff ffffffff
[  125.127038] 3f40: 7ba97a94 0000007f 7bbcc588 0000007f 7bb5ea00 0000007f 5878d2e0 00000055
[  125.135199] 3f60: c4a610f0 0000007f 5878f4f0 00000055 c4a619b8 0000007f c4a61670 0000007f
[  125.143360] 3f80: 5878e010 00000055 c4a61448 0000007f 00000800 00000000 00000000 00000000
[  125.151520] 3fa0: 5878f4f0 00000055 00000800 00000000 c4a61678 0000007f c4a61390 0000007f
[  125.159681] 3fc0: 587701a4 00000055 c4a61390 0000007f 7bb5ea08 0000007f 80000000 00000000
[  125.167842] 3fe0: 5878f550 00000055 0000006a 00000000 0001bc00 c80302f0 09580401 10020801
[  125.176001] Call trace:
[  125.178443] [<ffffffc000a96618>] mutex_lock+0x24/0x60
[  125.183486] [<ffffffc0002af054>] debugfs_remove_recursive+0x54/0x160
[  125.189828] [<ffffffc00041dae8>] _regulator_put+0x50/0xe0
[  125.195213] [<ffffffc00041dba0>] regulator_put+0x28/0x3c
[  125.200512] [<ffffffc00041dbc4>] devm_regulator_release+0x10/0x18
[  125.206594] [<ffffffc0004d7de0>] release_nodes+0x64/0x98
[  125.211892] [<ffffffc0004d813c>] devres_release_all+0x4c/0x58
[  125.217627] [<ffffffc0004d40fc>] __device_release_driver+0x84/0xc8
[  125.223794] [<ffffffc0004d4164>] device_release_driver+0x24/0x38
[  125.229790] [<ffffffc0006ae654>] v4l2_async_notifier_unregister+0xdc/0x1fc
[  125.236651] [<ffffffc0006c54f8>] tegra_vi_graph_cleanup+0x18/0x80
[  125.242731] [<ffffffc0006c2e78>] tegra_vi_media_controller_cleanup+0x14/0x30
[  125.249767] [<ffffffbffc00776c>] $x+0x6c/0x104 [nvhost_vi]
[  125.255241] [<ffffffc0004d67fc>] platform_drv_remove+0x20/0x40
[  125.261061] [<ffffffc0004d40f4>] __device_release_driver+0x7c/0xc8
[  125.267227] [<ffffffc0004d48e8>] driver_detach+0x8c/0xc0
[  125.272527] [<ffffffc0004d3b8c>] bus_remove_driver+0x8c/0xb4
[  125.278173] [<ffffffc0004d5448>] driver_unregister+0x4c/0x58
[  125.283820] [<ffffffc0004d688c>] platform_driver_unregister+0x10/0x18
[  125.290247] [<ffffffbffc00781c>] vi_exit+0x18/0x20 [nvhost_vi]
[  125.296069] [<ffffffc00010bd2c>] SyS_delete_module+0x1bc/0x2d0
[  125.301889] Code: 52800be1 d0002300 912e6000 97d915b7 (885f7e60) 
[  125.308508] ---[ end trace 6b0fa630ff1191ae ]---

6) Removing manualy nvhost_vi.ko from drivers and trying to rmmod ov5693 leads to NULL pointer error:
[   39.671035] Unable to handle kernel NULL pointer dereference at virtual address 000000a8
[   39.679123] pgd = ffffffc0d93b6000
[   39.682551] [000000a8] *pgd=0000000000000000
[   39.686830] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[   39.692392] Enter nvdumper_crash_setup_regs
[   39.696608] nvdumper: all registers are saved.
[   39.696615] nvdumper: all registers are saved.
[   39.696621] nvdumper: all registers are saved.
[   39.709908] nvdumper: all registers are saved.
[   39.714343] Modules linked in: bcmdhd soc_camera soc_mediabus videobuf_core cfg80211 rfcomm bnep ov5693(-) bluedroid_pm
[   39.725212] CPU: 2 PID: 1578 Comm: rmmod Not tainted 3.10.96-urcpi-1.0.3a+ #11
[   39.732419] task: ffffffc0fc48f100 ti: ffffffc0f8c5c000 task.ti: ffffffc0f8c5c000
[   39.739892] PC is at mutex_lock+0x24/0x60
[   39.743893] LR is at mutex_lock+0x24/0x60
[   39.747893] pc : [<ffffffc000a96618>] lr : [<ffffffc000a96618>] pstate: 60000145
[   39.755272] sp : ffffffc0f8c5fc70
[   39.758579] x29: ffffffc0f8c5fc70 x28: ffffffc0f8c5c000 
[   39.763901] x27: ffffffc0010f8000 x26: 000000000000006a 
[   39.769222] x25: 0000000000000116 x24: 0000000000000015 
[   39.774543] x23: ffffffc00130e098 x22: ffffffc00130e094 
[   39.779862] x21: ffffffc0fa862540 x20: ffffffc0fa862540 
[   39.785180] x19: 00000000000000a8 x18: 0000007fe623bcb0 
[   39.790500] x17: 000000557f4622e0 x16: ffffffc00010bb70 
[   39.795819] x15: 0000007f84233588 x14: 0000007f840fea94 
[   39.801137] x13: ffffffffffffffff x12: 0000000000000002 
[   39.806456] x11: 0000000000000011 x10: 00000000ffffffff 
[   39.811775] x9 : ffffffc0f8c5faf0 x8 : 87ffffffffffffff 
[   39.817093] x7 : 3f05657db2a43c03 x6 : ffffffc0012b9ea8 
[   39.822411] x5 : ffffffc0f8c5c000 x4 : 0000000000000000 
[   39.827729] x3 : 0000000000000000 x2 : 0000000000000140 
[   39.833049] x1 : 000000000000005f x0 : ffffffc000ef8b98 
[   39.838368] 
[   39.838368] PC: 0xffffffc000a96598:
[   39.843322] 6598  97d8d4d0 17ffff91 910123a1 aa1503e0 97d8ef8c 17ffffb8 b9400260 7100041f
[   39.851575] 65b8  54fff360 17fffff9 910123a1 aa1503e0 97d8ef84 17ffffb5 b9400260 7100041f
[   39.859826] 65d8  54ffff41 17ffff92 a94153f3 a9425bf5 a94363f7 a8c67bfd d65f03c0 a9be7bfd
[   39.868078] 65f8  910003fd f9000bf3 aa0003f3 52800002 52800be1 d0002300 912e6000 97d915b7
[   39.876328] 6618  885f7e60 51000400 8801fe60 35ffffa1 d5033bbf 36f80060 aa1303e0 97ffff5a
[   39.884579] 6638  910003e0 9272c400 f9400800 f9000e60 f9400bf3 a8c27bfd d65f03c0 a9be7bfd
[   39.892831] 6658  910003fd a90153f3 aa0003f3 91001014 aa1403e0 940008b7 aa1303e0 52800021
[   39.901085] 6678  b8008401 f9400661 eb00003f 54000060 f9400820 97d92b88 aa1403e0 940009b2
[   39.909337] 
[   39.909337] LR: 0xffffffc000a96598:
[   39.914288] 6598  97d8d4d0 17ffff91 910123a1 aa1503e0 97d8ef8c 17ffffb8 b9400260 7100041f
[   39.922540] 65b8  54fff360 17fffff9 910123a1 aa1503e0 97d8ef84 17ffffb5 b9400260 7100041f
[   39.930792] 65d8  54ffff41 17ffff92 a94153f3 a9425bf5 a94363f7 a8c67bfd d65f03c0 a9be7bfd
[   39.939041] 65f8  910003fd f9000bf3 aa0003f3 52800002 52800be1 d0002300 912e6000 97d915b7
[   39.947290] 6618  885f7e60 51000400 8801fe60 35ffffa1 d5033bbf 36f80060 aa1303e0 97ffff5a
[   39.955539] 6638  910003e0 9272c400 f9400800 f9000e60 f9400bf3 a8c27bfd d65f03c0 a9be7bfd
[   39.963789] 6658  910003fd a90153f3 aa0003f3 91001014 aa1403e0 940008b7 aa1303e0 52800021
[   39.972041] 6678  b8008401 f9400661 eb00003f 54000060 f9400820 97d92b88 aa1403e0 940009b2
[   39.980297] 
[   39.980297] SP: 0xffffffc0f8c5fbf0:
[   39.985250] fbf0  fa862540 ffffffc0 fa862540 ffffffc0 0130e094 ffffffc0 0130e098 ffffffc0
[   39.993501] fc10  00000015 00000000 00000116 00000000 0000006a 00000000 010f8000 ffffffc0
[   40.001752] fc30  f8c5c000 ffffffc0 f8c5fc70 ffffffc0 00a96618 ffffffc0 f8c5fc70 ffffffc0
[   40.010000] fc50  00a96618 ffffffc0 60000145 00000000 f8c5fc70 ffffffc0 00a96618 ffffffc0
[   40.018248] fc70  f8c5fc90 ffffffc0 002af054 ffffffc0 fe067840 ffffffc0 0008bd98 ffffffc0
[   40.026499] fc90  f8c5fcd0 ffffffc0 0041dae8 ffffffc0 fe067840 ffffffc0 fed61000 ffffffc0
[   40.034752] fcb0  fed61058 ffffffc0 f8c5fd70 ffffffc0 0000000a 00000000 00000015 00000000
[   40.043004] fcd0  f8c5fd00 ffffffc0 0041dba0 ffffffc0 01137420 ffffffc0 fe067840 ffffffc0
[   40.051256] 
[   40.051256] X0: 0xffffffc000ef8b18:
[   40.056209] 8b18  6f6c635f 6e5f6b63 736f6e61 7065656c 00000000 00000000 6e72656b 6b2f6c65
[   40.064462] 8b38  65726874 632e6461 00000000 00000000 7268746b 64646165 00000000 00000000
[   40.072712] 8b58  6e72656b 702f6c65 7869736f 7570632d 6d69742d 2e737265 00000063 00000000
[   40.080963] 8b78  54523601 74615720 6f646863 69542067 756f656d 25203a74 64255b73 00000a5d
[   40.089213] 8b98  6e72656b 6d2f6c65 78657475 0000632e 6e72656b 682f6c65 6d697472 632e7265
[   40.097462] 8bb8  00000000 00000000 6f433401 20646c75 20746f6e 74697773 74206863 6968206f
[   40.105715] 8bd8  72206867 6c6f7365 6f697475 6f6d206e 6f206564 5043206e 64252055 0000000a
[   40.113965] 8bf8  72683601 656d6974 725f7372 6d757365 20292865 6c6c6163 77206465 20687469
[   40.122217] 
[   40.122217] X5: 0xffffffc0f8c5bf80:
[   40.127170] bf80  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.135418] bfa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.143669] bfc0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.151917] bfe0  00000000 00000000 00000000 00000000 7483b003 00000001 6c9ca003 00000001
[   40.160166] c000  00000000 00000000 ffffffff ffffffff fc48f100 ffffffc0 000bc344 ffffffc0
[   40.168413] c020  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.176663] c040  00000000 00000000 00000002 00000002 00000100 00000000 57ac6e9d 00000000
[   40.184910] c060  04010401 00000000 00400000 00000102 00010000 00000040 00200000 00000102
[   40.193161] 
[   40.193161] X6: 0xffffffc0012b9e28:
[   40.198114] 9e28  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.206365] 9e48  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.214615] 9e68  00000000 00000000 00000000 00000000 01262cf0 ffffffc0 0000000f 00000000
[   40.222865] 9e88  0000000f 00000000 00020002 00000000 01149420 ffffffc0 00000000 00000000
[   40.231116] 9ea8  0000000f 00000000 00000000 00000000 0000000f 00000000 00000000 00000000
[   40.239367] 9ec8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.247620] 9ee8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 000010ff
[   40.255873] 9f08  00000043 00000001 00000000 00000000 00000000 00000000 00000000 00000000
[   40.264126] 
[   40.264126] X9: 0xffffffc0f8c5fa70:
[   40.269079] fa70  fa8acc30 ffffffc0 00a98d78 ffffffc0 f8c5fac0 ffffffc0 000de808 ffffffc0
[   40.277331] fa90  f8c5faa0 ffffffc0 00081214 ffffffc0 f8c5fc70 ffffffc0 00084c30 ffffffc0
[   40.285583] fab0  000000a8 00000000 fa862540 ffffffc0 f8c5fc70 ffffffc0 00a96618 ffffffc0
[   40.293835] fad0  f8c5fb10 ffffffc0 000de808 ffffffc0 f8c5fb20 ffffffc0 f8c5fb50 ffffffc0
[   40.302089] faf0  f8c5fb10 ffffffc0 000de80c ffffffc0 f8c5fb30 ffffffc0 0008bd98 ffffffc0
[   40.310340] fb10  00000001 00000000 00122420 ffffffc0 fa862e30 ffffffc0 01108c80 ffffffc0
[   40.318594] fb30  f8c5fb70 ffffffc0 000de808 ffffffc0 f8c5fb80 ffffffc0 f8c5fbb0 ffffffc0
[   40.326842] fb50  00ef8b98 ffffffc0 0000005f 00000000 00000140 00000000 00000000 00000000
[   40.335095] 
[   40.335095] X16: 0xffffffc00010baf0:
[   40.340135] baf0  aa1503e0 94081d96 aa1403e0 97ffffcf aa1403e0 97fff75e b940ea81 f9407280
[   40.348392] bb10  97ff0506 aa1303e0 94262ab7 d2800002 aa1403e1 90ffffe0 910b3000 94003508
[   40.356643] bb30  aa1303e0 94262adc f9409681 aa1403e0 97ffffaa f940ca80 9401ff5e aa1403e0
[   40.364892] bb50  97fff6ca f9409a81 aa1403e0 97ffffa3 a94153f3 f94013f5 a8c37bfd d65f03c0
[   40.373143] bb70  a9b97bfd 910003fd a90153f3 a9025bf5 aa0003f5 aa0103f6 90008ac0 910fc000
[   40.381391] bb90  b9400800 34000340 910003e0 9272c401 b9404820 11000400 b9004820 90008ac0
[   40.389636] bbb0  910fc000 f9401013 b4000133 b0006f94 91362294 f9400262 aa1403e1 f9400660
[   40.397881] bbd0  d63f0040 f8410e60 b5ffff60 910003e0 9272c400 b9404801 51000421 b9004801
[   40.406136] 
[   40.406136] X20: 0xffffffc0fa8624c0:
[   40.411175] 24c0  746e756f 00000000 00000000 00000000 00000000 00000000 00000000 000a000a
[   40.419428] 24e0  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000000 00000000 00000000 00000000
[   40.427680] 2500  fa862500 ffffffc0 fa862500 ffffffc0 fa882a50 ffffffc0 fa884ca0 ffffffc0
[   40.435928] 2520  fa862520 ffffffc0 fa862520 ffffffc0 fdbb4168 ffffffc0 001ab0d8 ffffffc0
[   40.444178] 2540  00100088 00000008 00000000 00000000 00000000 00000000 ff988b00 ffffffc0
[   40.452433] 2560  b3ac2104 0000000a fa862578 ffffffc0 00000000 00000000 30302d36 762d3633
[   40.460683] 2580  00006669 5825ab10 00000000 5825ab10 5788be44 0025ab10 00000000 00170017
[   40.468936] 25a0  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000000 00000000 00000000 00000000
[   40.477190] 
[   40.477190] X21: 0xffffffc0fa8624c0:
[   40.482229] 24c0  746e756f 00000000 00000000 00000000 00000000 00000000 00000000 000a000a
[   40.490479] 24e0  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000000 00000000 00000000 00000000
[   40.498735] 2500  fa862500 ffffffc0 fa862500 ffffffc0 fa882a50 ffffffc0 fa884ca0 ffffffc0
[   40.506986] 2520  fa862520 ffffffc0 fa862520 ffffffc0 fdbb4168 ffffffc0 001ab0d8 ffffffc0
[   40.515237] 2540  00100088 00000008 00000000 00000000 00000000 00000000 ff988b00 ffffffc0
[   40.523491] 2560  b3ac2104 0000000a fa862578 ffffffc0 00000000 00000000 30302d36 762d3633
[   40.531744] 2580  00006669 5825ab10 00000000 5825ab10 5788be44 0025ab10 00000000 00170017
[   40.539989] 25a0  00ab5380 ffffffc0 ff15fc00 ffffffc0 00000000 00000000 00000000 00000000
[   40.548242] 
[   40.548242] X22: 0xffffffc00130e014:
[   40.553282] e014  ffffffc0 fe491800 ffffffc0 fe4918c0 ffffffc0 fe491980 ffffffc0 fe491a40
[   40.561534] e034  ffffffc0 00000000 00000000 00000000 00000000 00000000 00000000 fe4915c0
[   40.569786] e054  ffffffc0 fe489400 ffffffc0 fe4894c0 ffffffc0 fe491680 ffffffc0 000004eb
[   40.578050] e074  000004eb f39973f0 ffffffc0 f39973f0 ffffffc0 fca7ac00 ffffffc0 00000001
[   40.586304] e094  00002f47 ffc3e9a0 ffffffc0 ff0ea740 ffffffc0 fe489340 ffffffc0 fca7bc00
[   40.594558] e0b4  ffffffc0 00020002 00000000 01118830 ffffffc0 00000000 00000000 00010001
[   40.602804] e0d4  00000000 00000000 00000000 00000000 00000001 00200000 00000000 f6000000
[   40.611055] e0f4  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.619304] 
[   40.619304] X23: 0xffffffc00130e018:
[   40.624343] e018  fe491800 ffffffc0 fe4918c0 ffffffc0 fe491980 ffffffc0 fe491a40 ffffffc0
[   40.632596] e038  00000000 00000000 00000000 00000000 00000000 00000000 fe4915c0 ffffffc0
[   40.640847] e058  fe489400 ffffffc0 fe4894c0 ffffffc0 fe491680 ffffffc0 000004eb 000004eb
[   40.649098] e078  f39973f0 ffffffc0 f39973f0 ffffffc0 fca7ac00 ffffffc0 00000001 00002f47
[   40.657346] e098  ffc3e9a0 ffffffc0 ff0ea740 ffffffc0 fe489340 ffffffc0 fca7bc00 ffffffc0
[   40.665595] e0b8  00020002 00000000 01118830 ffffffc0 00000000 00000000 00010001 00000000
[   40.673847] e0d8  00000000 00000000 00000000 00000001 00200000 00000000 f6000000 00000000
[   40.682100] e0f8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.690351] 
[   40.690351] X27: 0xffffffc0010f7f80:
[   40.695392] 7f80  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.703639] 7fa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.711888] 7fc0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.720136] 7fe0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.728387] 8000  001e3108 ffffffc0 001e3334 ffffffc0 001e3680 ffffffc0 001e37b8 ffffffc0
[   40.736637] 8020  001e39e4 ffffffc0 001babf0 ffffffc0 001badb4 ffffffc0 001baf78 ffffffc0
[   40.744882] 8040  001bb10c ffffffc0 001bb29c ffffffc0 001bb42c ffffffc0 001bb59c ffffffc0
[   40.753133] 8060  001bb724 ffffffc0 001bb8ac ffffffc0 001bba0c ffffffc0 001bbba8 ffffffc0
[   40.761386] 
[   40.761386] X28: 0xffffffc0f8c5bf80:
[   40.766425] bf80  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.774681] bfa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.782930] bfc0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.791180] bfe0  00000000 00000000 00000000 00000000 7483b003 00000001 6c9ca003 00000001
[   40.799427] c000  00000000 00000000 ffffffff ffffffff fc48f100 ffffffc0 000bc344 ffffffc0
[   40.807679] c020  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   40.815932] c040  00000000 00000000 00000002 00000002 00000100 00000000 57ac6e9d 00000000
[   40.824186] c060  04010401 00000000 00400000 00000102 00010000 00000040 00200000 00000102
[   40.832433] 
[   40.832433] X29: 0xffffffc0f8c5fbf0:
[   40.837472] fbf0  fa862540 ffffffc0 fa862540 ffffffc0 0130e094 ffffffc0 0130e098 ffffffc0
[   40.845726] fc10  00000015 00000000 00000116 00000000 0000006a 00000000 010f8000 ffffffc0
[   40.853979] fc30  f8c5c000 ffffffc0 f8c5fc70 ffffffc0 00a96618 ffffffc0 f8c5fc70 ffffffc0
[   40.862226] fc50  00a96618 ffffffc0 60000145 00000000 f8c5fc70 ffffffc0 00a96618 ffffffc0
[   40.870481] fc70  f8c5fc90 ffffffc0 002af054 ffffffc0 fe067840 ffffffc0 0008bd98 ffffffc0
[   40.878734] fc90  f8c5fcd0 ffffffc0 0041dae8 ffffffc0 fe067840 ffffffc0 fed61000 ffffffc0
[   40.886984] fcb0  fed61058 ffffffc0 f8c5fd70 ffffffc0 0000000a 00000000 00000015 00000000
[   40.895236] fcd0  f8c5fd00 ffffffc0 0041dba0 ffffffc0 01137420 ffffffc0 fe067840 ffffffc0
[   40.903487] 
[   40.904975] Process rmmod (pid: 1578, stack limit = 0xffffffc0f8c5c058)
[   40.911574] Stack: (0xffffffc0f8c5fc70 to 0xffffffc0f8c60000)
[   40.917308] fc60:                                     f8c5fc90 ffffffc0 002af054 ffffffc0
[   40.925469] fc80: fe067840 ffffffc0 0008bd98 ffffffc0 f8c5fcd0 ffffffc0 0041dae8 ffffffc0
[   40.933631] fca0: fe067840 ffffffc0 fed61000 ffffffc0 fed61058 ffffffc0 f8c5fd70 ffffffc0
[   40.941793] fcc0: 0000000a 00000000 00000015 00000000 f8c5fd00 ffffffc0 0041dba0 ffffffc0
[   40.949953] fce0: 01137420 ffffffc0 fe067840 ffffffc0 fe6d0028 ffffffc0 00000015 00000000
[   40.958113] fd00: f8c5fd20 ffffffc0 0041dbc4 ffffffc0 f9dcde80 ffffffc0 f9dcdf40 ffffffc0
[   40.966273] fd20: f8c5fd30 ffffffc0 004d7de0 ffffffc0 f8c5fd80 ffffffc0 004d813c ffffffc0
[   40.974433] fd40: fe6d0028 ffffffc0 fc00be98 ffffffbf fe6d0088 ffffffc0 00000800 00000000
[   40.982593] fd60: 80000000 00000000 004d8128 ffffffc0 fbea4800 ffffffc0 f9dcda00 ffffffc0
[   40.990753] fd80: f8c5fda0 ffffffc0 004d40fc ffffffc0 fe6d0028 ffffffc0 00000800 00000000
[   40.998913] fda0: f8c5fdc0 ffffffc0 004d48e8 ffffffc0 fe6d0028 ffffffc0 fc00be98 ffffffbf
[   41.007073] fdc0: f8c5fdf0 ffffffc0 004d3b8c ffffffc0 fc00be98 ffffffbf e623c9be 0000007f
[   41.015234] fde0: 00000000 00000000 00000001 ffffffc0 f8c5fe10 ffffffc0 004d5448 ffffffc0
[   41.023394] fe00: fc00be98 ffffffbf 00695b48 ffffffc0 f8c5fe30 ffffffc0 00695b50 ffffffc0
[   41.031555] fe20: fc00be50 ffffffbf 00000800 00000000 f8c5fe50 ffffffc0 fc008eec ffffffbf
[   41.039716] fe40: fc00c588 ffffffbf 00000015 00000000 f8c5fe60 ffffffc0 0010bd2c ffffffc0
[   41.047878] fe60: e623bf50 0000007f 000853c8 ffffffc0 7f463090 00000055 e623c9be 0000007f
[   41.056038] fe80: ffffffff ffffffff 841c5a08 0000007f 60000000 00000000 3635766f 00003339
[   41.064199] fea0: 00000116 00000000 000853c8 ffffffc0 e623af20 0000007f 00085470 ffffffc0
[   41.072360] fec0: 7f463090 00000055 e623af70 0000007f 7f4630f0 00000055 00000800 00000000
[   41.080522] fee0: 00000a00 00000000 00002002 00000000 84231e58 0000007f e623aef9 0000007f
[   41.088683] ff00: 8416f714 0000007f 919c999a ffffff8b 0000006a 00000000 99999999 19999999
[   41.096844] ff20: ffffffff 00000000 00000000 00000000 00000005 00000000 ffffffff ffffffff
[   41.105005] ff40: 840fea94 0000007f 84233588 0000007f 841c5a00 0000007f 7f4622e0 00000055
[   41.113167] ff60: e623bcb0 0000007f 7f463090 00000055 e623c9be 0000007f e623c230 0000007f
[   41.121328] ff80: 7f463010 00000055 e623c008 0000007f 00000800 00000000 00000000 00000000
[   41.129490] ffa0: 7f463090 00000055 00000800 00000000 e623c238 0000007f e623bf50 0000007f
[   41.137652] ffc0: 7f4451a4 00000055 e623bf50 0000007f 841c5a08 0000007f 80000000 00000000
[   41.145813] ffe0: 7f4630f0 00000055 0000006a 00000000 00000000 00000000 00000000 00000000
[   41.153972] Call trace:
[   41.156416] [<ffffffc000a96618>] mutex_lock+0x24/0x60
[   41.161460] [<ffffffc0002af054>] debugfs_remove_recursive+0x54/0x160
[   41.167802] [<ffffffc00041dae8>] _regulator_put+0x50/0xe0
[   41.173188] [<ffffffc00041dba0>] regulator_put+0x28/0x3c
[   41.178488] [<ffffffc00041dbc4>] devm_regulator_release+0x10/0x18
[   41.184571] [<ffffffc0004d7de0>] release_nodes+0x64/0x98
[   41.189872] [<ffffffc0004d813c>] devres_release_all+0x4c/0x58
[   41.195606] [<ffffffc0004d40fc>] __device_release_driver+0x84/0xc8
[   41.201773] [<ffffffc0004d48e8>] driver_detach+0x8c/0xc0
[   41.207075] [<ffffffc0004d3b8c>] bus_remove_driver+0x8c/0xb4
[   41.212721] [<ffffffc0004d5448>] driver_unregister+0x4c/0x58
[   41.218371] [<ffffffc000695b50>] i2c_del_driver+0x24/0x58
[   41.223762] [<ffffffbffc008eec>] $x+0x18/0x20 [ov5693]
[   41.228892] [<ffffffc00010bd2c>] SyS_delete_module+0x1bc/0x2d0
[   41.234713] Code: 52800be1 d0002300 912e6000 97d915b7 (885f7e60) 
[   41.241078] ---[ end trace 668eba406076f87e ]---

*** What should I exactly do to make default OV5693 work via V4L2??? ***

A quick way to fix issue for cheese is to create below sw link,

ubuntu@tegra-ubuntu:~$ sudo ln -s /usr/lib/aarch64-linux-gnu/tegra/libGL.so.1 /usr/lib/aarch64-linux-gnu/libGL.so
[sudo] password for ubuntu: 
ubuntu@tegra-ubuntu:~$ ls -l /usr/lib/aarch64-linux-gnu/libGL.so*
lrwxrwxrwx 1 root root 43 Jul 20 06:22 /usr/lib/aarch64-linux-gnu/libGL.so -> /usr/lib/aarch64-linux-gnu/tegra/libGL.so.1

or you can add below patch into your /etc/init/nv.conf,

--- a/rfs/etc/init/nv.conf
+++ b/rfs/etc/init/nv.conf
@@ -108,14 +108,18 @@ script
        # Alternatively, package management tools could be used to prevent updates
        ARCH=`/usr/bin/dpkg --print-architecture`
        if [ "x${ARCH}" = "xarm64" ]; then
-               LIB_DIR="/usr/lib/aarch64-linux-gnu/tegra"
+               LIB_DIR="/usr/lib/aarch64-linux-gnu"
        elif [ "x${ARCH}" = "xarmhf" ]; then
-               LIB_DIR="/usr/lib/arm-linux-gnueabihf/tegra"
+               LIB_DIR="/usr/lib/arm-linux-gnueabihf"
        else
-               LIB_DIR="/usr/lib/arm-linux-gnueabi/tegra"
+               LIB_DIR="/usr/lib/arm-linux-gnueabi"
        fi
 
-       if [ -e "${LIB_DIR}/libglx.so" ]; then
-               ln -sf ${LIB_DIR}/libglx.so /usr/lib/xorg/modules/extensions/libglx.so
+       if [ -e "${LIB_DIR}/tegra/libglx.so" ]; then
+               ln -sf ${LIB_DIR}/tegra/libglx.so /usr/lib/xorg/modules/extensions/libglx.so
+       fi
+
+       if [ -e "${LIB_DIR}/tegra/libGL.so.1" ]; then
+               ln -sf ${LIB_DIR}/tegra/libGL.so.1 ${LIB_DIR}/libGL.so
        fi
 end script

Hi NvConan,

  1. Even it does not work with these changes you suggested.
    I am using TX1 with L4T 24.1, while i try to capture video using cheese it gives error:

One or more needed G Streamer elements are missing: cluttervideosink.

  1. And with v4l2 pipeline is also not working. Only i can see a black window while a run it with v4l2 with the following warning…

WARNING: from element /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0: A lot of buffers are being dropped.
Additional debug info:
gstbasesink.c(2791): gst_base_sink_is_too_late (): /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
There may be a timestamping problem, or this computer is too slow.

Is there any fix for this problem ?

Have you tried this change?
https://devtalk.nvidia.com/default/topic/947552/jetson-tx1/enabling-ov5693-v4l2-driver-in-l4t-24-1/post/4915124/#4915124