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Kernel Oops

Posted: 2018/05/23 12:49:14
by ohw0571
Dear community,

I am currently observing a strange bug on one of the CentOS 7 systems I am administering: During every reboot, ABRT generates a crash report, with the backtrace containing these lines:

BUG: unable to handle kernel paging request at ffffebe000040000
Oops: 0000 [#1] SMP
CPU: 3 PID: 2568 Comm: umount.nfs Not tainted 3.10.0-514.10.2.el7.x86_64 #1

For subsequent occurrences of the crash (recorded by deleting the problem directory and rebooting), the output of abrt-cli info -d <dir> is identical (with the exception of the timestamps of course). So it appears to be always CPU #3, PID 2568 and Comm. (=command?) umount.nfs which is associated with the problem. Notably, the error occurs regardless of whether or not nfs mounts are present!
As mentioned above, this type of crash is happening on a single machine only. I was thinking of a hardware issue first, but checks did not reveal any defect. Updating the BIOS did not help either.

Any ideas in what direction to look next?