JetPack 4.6.3 preempt-rt patkernel: reboot loop

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
,
22

Hi @DaveYYY

Using NVidia distro, I reverted the commit b3fb2b5173662 enabled more lock debugging flags in the kernel config .config (163.3 KB), rebuilt and flashed the device.

I am back at the boot loop but I can see more information.

There’s are 3 lock errors detected, see kernel_lock_console.txt (69.6 KB).

Ex:

[    5.254801] BUG: sleeping function called from invalid context at ../kernel/locking/rtmutex.c:987
[    5.254804] in_atomic(): 1, irqs_disabled(): 128, pid: 5, name: kworker/u12:0
[    5.254805] INFO: lockdep is turned off.
[    5.254808] irq event stamp: 0
[    5.254810] hardirqs last  enabled at (0): [<          (null)>]           (null)
[    5.254820] hardirqs last disabled at (0): [<        (ptrval)>] copy_process.isra.7.part.8+0x2a8/0x18d0
[    5.254823] softirqs last  enabled at (0): [<        (ptrval)>] copy_process.isra.7.part.8+0x2a8/0x18d0
[    5.254825] softirqs last disabled at (0): [<          (null)>]           (null)
[    5.254831] Preemption disabled at:
[    5.254832] [<        (ptrval)>] tegra_i2c_xfer_msg+0x1d8/0xc38
[    5.254838] CPU: 0 PID: 5 Comm: kworker/u12:0 Tainted: G        W       4.9.337-rt197-d-tegra-rt #4
[    5.254840] Hardware name: quill (DT)
[    5.254852] Workqueue: events_unbound async_run_entry_fn
[    5.254854] Call trace:
[    5.254858] [<        (ptrval)>] dump_backtrace+0x0/0x1a0
[    5.254861] [<        (ptrval)>] show_stack+0x24/0x30
[    5.254865] [<        (ptrval)>] dump_stack+0xa4/0xd4
[    5.254870] [<        (ptrval)>] ___might_sleep+0x15c/0x230
[    5.254873] [<        (ptrval)>] rt_spin_lock+0x30/0x70
[    5.254878] [<        (ptrval)>] devres_add+0x2c/0x70
[    5.254881] [<        (ptrval)>] devm_kmalloc+0x5c/0x88
[    5.254886] [<        (ptrval)>] tegra_dma_sg_req_get+0xa4/0xc8
[    5.254889] [<        (ptrval)>] tegra_dma_prep_slave_sg+0x190/0x498
[    5.254892] [<        (ptrval)>] tegra_i2c_xfer_msg+0x238/0xc38
[    5.254894] [<        (ptrval)>] tegra_i2c_xfer+0x5e4/0x7a8
[    5.254897] [<        (ptrval)>] __i2c_transfer+0x128/0x9e0
[    5.254900] [<        (ptrval)>] i2c_transfer+0x98/0x108
[    5.254905] [<        (ptrval)>] tegra_hdmi_ddc_i2c_xfer+0x70/0x158
[    5.254909] [<        (ptrval)>] tegra_edid_read_block+0xc0/0x260
[    5.254913] [<        (ptrval)>] tegra_edid_get_monspecs+0x6c/0xbd8
[    5.254917] [<        (ptrval)>] tegra_hdmi_controller_enable+0x2e0/0xf80
[    5.254920] [<        (ptrval)>] tegra_dc_hdmi_enable+0x48/0xb8
[    5.254924] [<        (ptrval)>] tegra_nvdisp_head_enable+0x4a0/0x13b8
[    5.254927] [<        (ptrval)>] _tegra_dc_enable+0xf0/0x110
[    5.254930] [<        (ptrval)>] tegra_dc_probe+0x1204/0x1ac0
[    5.254933] [<        (ptrval)>] platform_drv_probe+0x60/0xc0
[    5.254936] [<        (ptrval)>] driver_probe_device+0x298/0x448
[    5.254938] [<        (ptrval)>] __driver_attach+0x110/0x138
[    5.254941] [<        (ptrval)>] bus_for_each_dev+0x5c/0xa8
[    5.254944] [<        (ptrval)>] driver_attach+0x30/0x40
[    5.254946] [<        (ptrval)>] driver_attach_async+0x20/0x60
[    5.254949] [<        (ptrval)>] async_run_entry_fn+0x48/0x150
[    5.254953] [<        (ptrval)>] process_one_work+0x288/0x7d8
[    5.254956] [<        (ptrval)>] worker_thread+0x50/0x4d0
[    5.254958] [<        (ptrval)>] kthread+0xf4/0xf8
[    5.254961] [<        (ptrval)>] ret_from_fork+0x10/0x50

I found a similar bug report R32.7.1 / 4.9.253-rt168 : BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:987

The patch mentioned as solution does not apply and has few errors

../init/do_mounts_rd.c: In function 'rd_load_image':
../init/do_mounts_rd.c:272:3: error: implicit declaration of function 'sys_write'; did you mean 'sys_writev'? [-Werror=implicit-function-declaration]
   sys_write(out_fd, buf, BLOCK_SIZE);
   ^~~~~~~~~
   sys_writev
  CC      arch/arm64/kernel/return_address.o
  LD      firmware/built-in.o
../init/initramfs.c: In function 'xwrite':
../init/initramfs.c:30:16: error: implicit declaration of function 'sys_write'; did you mean 'sys_writev'? [-Werror=implicit-function-declaration]
   ssize_t rv = sys_write(fd, p, count);
                ^~~~~~~~~
                sys_writev
  CC      arch/arm64/kernel/cpuinfo.o
  AS      arch/arm64/lib/bitops.o
  CC      sound/core/sound.o
  CC      arch/arm64/kernel/cpu_errata.o
  CC      arch/arm64/kernel/cpufeature.o
  CC      virt/lib/irqbypass.o
../include/uapi/asm-generic/unistd.h:206:23: error: 'sys_write' undeclared here (not in a function); did you mean 'sys_writev'?
 __SYSCALL(__NR_write, sys_write)
                       ^
../arch/arm64/kernel/sys.c:56:35: note: in definition of macro '__SYSCALL'
 #define __SYSCALL(nr, sym) [nr] = sym,

Can you reproduce the same on your side?

1 Like