Kernel Crash since update to 7.3-6, kernel 5.15.85

[RedChili]

Hello,

ever since I upgraded to 7.3 with kernel 5.15.85 my system from time to time goes into a hard lock due to a kernel BUG. The system freezes:

Mar 18 00:46:01 elcapitan CRON[386326]: (root) CMD (curl --data "cpu.fan,cpu=1 $(sensors -j | jq '.["nct6793-isa-0290"]["fan2"]["fan2_input"]')" http://>
Mar 18 00:46:01 elcapitan CRON[386323]: pam_unix(cron:session): session closed for user root
Mar 18 00:46:01 elcapitan CRON[386324]: pam_unix(cron:session): session closed for user root
Mar 18 00:46:41 elcapitan kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000

pve-manager/7.3-6/723bb6ec (running kernel: 5.15.85-1-pve)
root@elcapitan:~# uname -a
Linux elcapitan 5.15.85-1-pve #1 SMP PVE 5.15.85-1 (2023-02-01T00:00Z) x86_64 GNU/Linux

With 7.2. the system was stable for a long time. Looking at the above I suspected that reading the hardware sensors (which I do every minute for reporting fan/temp) might be the cause. But this is done every minute all the time, so unlikely.
Are there any known issues with that specific kernel/update?

Cheers

 

[cheiss]

Hi,

Do you have a copy/screenshot of the full BUG splat (esp. the backtrace)? Otherwise figuring out the actual issue will be near-impossible.

What you can try is installing the opt-in 6.2 kernel, which might have fixed the issue. Although no guarantees here of course - if this is a hardware problem, the kernel version won't matter.

I'd also recommend running memtest86, which is never a bad idea - maybe you got some faulty RAM stick which then causes this.