JetPack 4.6.3 preempt-rt patkernel: reboot loop

[damien.lefevre]

Hi,

@DaveYYY

I just tested with running smartctl on SATA drives, but it did not seem to cause anything abnormal.
Is it something that’s 100% guaranteed to happen?
Can you share what exact commands do you use in the use case?

For the SATA drive lock, I run this command "/usr/sbin/smart-log --test" after about a minute, I lose access to the disk. It happens 100% of the time and that’s using our meta-tegra based distro. I cannot log in the Ubuntu distro since the device keeps rebooting.

@DaveYYY

I think it just disables part of dmesg logs, but not all of them? Are you saying you get nothing from dmesg with the patch?

It disables all of them. But I think that’s the easiest command to use to find the root cause because it happen systematically. Looking at the syslog_print_all source some locking is happening there. I don’t know how to debug this.

@DaveYYY

Can you apply the patch and run longer to find if there are other ways to trigger this bug?

I’m not able to run the Ubuntu distro because of the reboots. With the meta-tegra distro I was only able to find the previously mentioned issues and spent days on it.

BTW according to this post Device reboots after using the RT-Kernel patch [JP4.6.3] the pre-built rt kernel deb package still uses an older kernel version. So it does need to be re-built to perform this test.