System stall when boot up

Robotics & Edge Computing Jetson Systems Jetson Thor
,
1

Hi, nvidia team:
Our custom Thor board may stall occasionally when boot up.
here is the log:

image
image1369×905 196 KB

开机卡死.log (113.0 KB)

BR//ChengKe

2

Looking at your attached log. The hang appears to be in pwm_tegra_tachometer module registration/probe path, possibly associated with the tachometer@810c5c0000 DT node. I think the journald and systemd-modules-load failures are secondary symptoms to that.

# Is your pwm_tegra_tachometer loaded?

lsmod |grep pwm
pwm_tegra_tachometer    12288  0
pwm_fan                16384  0
pwm_tegra              12288  1


# If not, try loading

sudo modprobe -v pwm_tegra_tachometer

A Test you could do is temporarily blacklist pwm_tegra_tachometer to see if that skips the error. But, I think you will need pwm_tegra_tachometer for fans and cooling.

printf '%s\n' 'blacklist pwm_tegra_tachometer' | sudo tee /etc/modprobe.d/blacklist-pwm-tegra-tachometer.conf
sudo reboot

Jetson Module Adaptation and Bring-Up: Checklists

Fan

  • Verify that the module’s PWM and TACH lines are connected to fan’s PWM and TACH lines.
  • Verify that the fan speed is changed based on the PWM signal pulse width.
  • Verify that the fan’s RPM can be measured using the TACH pin.
3

hi：nv team

我们想知道是什么原因导致的rt锁造成的堆栈，有没有patch修正，卡死之后，串口不能输入，系统也不重启，表现是开机不成功，目前复现了两次，我把另外一份log 也上传

log(1).txt (31.7 KB)

4

Check what compatible string your module expects:
modinfo obc_max96712 | grep alias
Then align your DT compatible property to match, or vice versa.

If max96712_c and max96712_d aren’t physically present on your custom carrier, disable those nodes:

&max96712_c {
    status = "disabled";
};
&max96712_d {
    status = "disabled";
};

This might be a bug in tegra_camera_rtcpu, it shouldn’t deadlock on device_link_drop_managed when camera devices fail to enumerate.

5

hi：nv team

Please analyze the log and determine which module caused the rt mutex issue.

7

Hi,
Please make sure you apply this to Jetpack 7.1:
Jetson AGX Thor FAQ

If the issue persists, please try to reproduce it on developer kit. We need to replicate it on developer kit first, and then investigate further.