[lustre-discuss] LBUG: 2.5.16, EL8 Linux 4.18.0-553.30.1 in 'll_truncate_inode_pages

[Peter Grandi]

[...] 
>>> If this is a manifestation of LU-16637 there is a fix, but I
>>> have checked the changelogs and LU-16637 is listed as
>>> applied to 2.16.0 but it does not seem to be listed in the
>>> 2.15.[1-6] changelogs.

>> This is indeed this bug, and as the ticket said, this is not
>> fixed in 2.15.x, only 2.16.0 I've no idea if this will ever
>> make 2.15.x

> You can always take the patch and apply it locally to your
> clients to see if it fixes the issue.

I was wondering whether to try that, but that the fix had not
already been applied to 2.16 got me to think that there were
some subtle changes between 2.15 and 2.16 that made it a
difficult operation. But I will try.

BTW I can easily switch to 2.16 except that I cannot yet easily
switch away from EL8, and allegedly 2.16 is not available for
EL8, at least in pre-compiled form:

  https://downloads.whamcloud.com/public/lustre/lustre-2.16.1/

I can easily rebuild from sources, but I wonder whether there is
some specific incompatibility between 2.16 and the EL8 kernel
and libraries...