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Date:      Tue, 22 Aug 2023 10:26:22 +0200
From:      Martin Matuska <mm@freebsd.org>
To:        Alexander Motin <mav@freebsd.org>
Cc:        Dag-Erling =?utf-8?b?U23DuHJncmF2?= <des@freebsd.org>, current@freebsd.org, Mateusz Guzik <mjguzik@gmail.com>
Subject:   Re: ZFS deadlock in 14
Message-ID:  <20230822102622.Horde.tUEwNRTMDn0AjOBiO1UB7OX@webmail.your-server.de>
In-Reply-To: <0fd64567-59cd-9276-cc0c-17a09611f11a@FreeBSD.org>
References:  <86leeltqcb.fsf@ltc.des.no> <86h6p4s64h.fsf@ltc.des.no> <86a5utrafp.fsf@ltc.des.no> <86350kqokl.fsf@ltc.des.no> <CAGudoHHGeC4qaZpmTc15-Rimo78qVUmg8-oYveMfo0_JO45TSw@mail.gmail.com> <86y1icp95t.fsf@ltc.des.no> <CAGudoHFgyb2%2B3jkfmuzG86FqCQfNfPOuoWpsXFByY=YBYCN%2BFQ@mail.gmail.com> <86ttt0p8wv.fsf@ltc.des.no> <197ead1e-210a-6be6-7e24-5c56b14bb777@FreeBSD.org> <86350hpiby.fsf@ltc.des.no> <0fd64567-59cd-9276-cc0c-17a09611f11a@FreeBSD.org>

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Hi Alexander,

as 15107 is a prerequisite for 15122,
would it be possible to have https://github.com/openzfs/zfs/pull/15107  
merged into the OpenZFS zfs-2.2-release branch (and of course later  
15122)?

If the patches help I can cherry-pick them into main.

Cheers,
mm


Alexander Motin <mav@freebsd.org> wrote:

> On 17.08.2023 15:41, Dag-Erling Smørgrav wrote:
>> Alexander Motin <mav@FreeBSD.org> writes:
>>> Trying to run your test (so far without reproduction) I see it
>>> producing a substantial amount of ZIL writes.  The range of commits
>>> you reduced the scope to so far includes my ZIL locking refactoring,
>>> where I know for sure are some deadlocks.  I am already waiting for 3
>>> weeks now for reviews and tests for PR that should fix it:
>>> https://github.com/openzfs/zfs/pull/15122 .  It would be good if you
>>> could test it, though it seems to depend on few more earlier patches
>>> not merged to FreeBSD yet.
>>
>> Do you have a FreeBSD branch with your patch applied?
>
> I don't have a FreeBSD branch, but these two patches apply clean and  
> build on top of today's FreeBSD main branch:
>
> https://github.com/openzfs/zfs/pull/15107
> https://github.com/openzfs/zfs/pull/15122
>
> And if you still experience the issue, please show all stacks, or at  
> least include ZFS sync threads.
>
> -- 
> Alexander Motin






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