Crashes with newest kernel (4.18.0-240.1.1)

[rob153]

Hi,

After the newest kernel upgrade to 4.18.0-240.1.1, I'm experiencing very frequent system crashes, about two per day.

Usually, there is no log output whatsoever, the screen goes black and after a while the workstation reboots. Once out of many crashes I actually got an error on the screen which said there was a "NULL pointer dereference" in the kernel, and a stack containing hub_tt_work(). I googled a bit and found that this likely relates to USB somehow, but other than that I didn't find any helpful information.

Does anyone else experience this kind of problems currently?

I now reverted back to using kernel 4.18.0-193.28.1 which is stable and doesn't have this problem.

Any feedback appreciated!

[enigma131]

Have you some traces in journalctl for previous boot after crash?
Or some errors in dmesg at 240 boot you haven't for 193 ?

[rob153]

I didn't see anything out of the ordinary in the logs (although the problem might obviously be that I don't know what to look for...)

At any rate, at the time of the crash nothing gets logged. It seems the crash is too severe to allow any logging to the persistent journal before the reboot happens.

I was mainly wondering if I'm the only one experiencing this or if others also have issues with the new kernel.
Looks like I might have to wait for the next kernel update and see if that problem goes away.

[enigma131]

Are you sure about your hardware side?
SMART datas from disk and memtest for RAM test

[rob153]

SMART gives my disks a clean bill of health.
Haven't done memtest yet as that takes a long time and so I will have to take the system offline for a day at some point.

However wouldn't memory failures affect the older kernel all the same?