Re: LVM kernel lockup scenario during lvcreate

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Hi,

On 2023/06/12 20:40, Bart Van Assche wrote:
On 6/9/23 00:29, Jaco Kroon wrote:
I'm attaching dmesg -T and ps axf.  dmesg in particular may provide
clues as it provides a number of stack traces indicating stalling at
IO time.

Once this has triggered, even commands such as "lvs" goes into
uninterruptable wait, I unfortunately didn't test "dmsetup ls" now
and triggered a reboot already (system needs to be up).

To me the call traces suggest that an I/O request got stuck. Unfortunately call traces are not sufficient to identify the root cause in case I/O gets stuck. Has debugfs been mounted? If so, how about dumping the contents of /sys/kernel/debug/block/ into a tar file after the lockup has been reproduced and sharing that information?

tar -czf- -C /sys/kernel/debug/block . >block.tgz

Right on queue ... please find attached.  Not seeing any content in any of the files from the tar czf so I doubt there is much use here ... perhaps you might be able to explain why all of these files under /sys/kernel/debug/block would be empty?

Kind Regards,
Jaco

Attachment: block.tgz
Description: application/gzip

Attachment: ps.txt.gz
Description: application/gzip

Attachment: dmesg.txt.gz
Description: application/gzip


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