Re: MDS "newly corrupt dentry" after patch version upgrade

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On Wed, May 3, 2023 at 4:33 AM Janek Bevendorff
<janek.bevendorff@xxxxxxxxxxxxx> wrote:
>
> Hi Patrick,
>
> > I'll try that tomorrow and let you know, thanks!
>
> I was unable to reproduce the crash today. Even with
> mds_abort_on_newly_corrupt_dentry set to true, all MDS booted up
> correctly (though they took forever to rejoin with logs set to 20).
>
> To me it looks like the issue has resolved itself overnight. I had run a
> recursive scrub on the file system and another snapshot was taken, in
> case any of those might have had an effect on this. It could also be the
> case that the (supposedly) corrupt journal entry has simply been
> committed now and hence doesn't trigger the assertion any more. Is there
> any way I can verify this?

You can run:

https://github.com/ceph/ceph/blob/main/src/tools/cephfs/first-damage.py

Just do:

python3 first-damage.py --memo run.1 <meta pool>

No need to do any of the other steps if you just want a read-only check.

-- 
Patrick Donnelly, Ph.D.
He / Him / His
Red Hat Partner Engineer
IBM, Inc.
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
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