Re: git: 315ee00fa961 - main - zfs: merge openzfs/zfs@804414aad

On 31.08.2023 22:18, Kyle Evans wrote:
> It seems to have clearly been stomped on by uma trashing. Encountered 
> while running a pkgbase build, I think while it was in the packaging 
> phase. I note in particular in that frame:
> 
> (kgdb) p/x lwb->lwb_issued_timestamp
> $4 = 0xdeadc0dedeadc0de
> 
> So I guess it was freed sometime during one of the previous two 
> zio_nowait() calls.

Thank you, Kyle.  If the source lines are resolved correctly and it 
really crashes on lwb_child_zio access, then I do see there a possible 
race condition, even though I think it would involve at least 2 or may 
be even 3 different threads.

I've just created this new PR to address it:
https://github.com/openzfs/zfs/pull/15233

If you'll be able to test it, include also the two previous:
https://github.com/openzfs/zfs/pull/15227
https://github.com/openzfs/zfs/pull/15228

Thank you for something actionable, it really feels much better! :)

-- 
Alexander Motin