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Date:      Thu, 27 Sep 2018 20:03:48 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 229614] ZFS lockup in zil_commit_impl
Message-ID:  <bug-229614-3630-9EC41cA0GR@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-229614-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-229614-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D229614

--- Comment #16 from Andreas Sommer <andreas.sommer87@googlemail.com> ---
Hi all,

within the last weeks I've managed to strip my host's workload down to a
reproducible example of the interlock, and here it is:
https://github.com/AndiDog/zfs-lockup

Please have a look at the `README` and `scripts/all.sh` files at least to
understand the very simple setup. Sure it can be reproduced with even simpl=
er
tricks. I talked to Allan Jude (CC) at EuroBSDcon and he thought that any
synchronous write might trigger the issue (and had some ideas on debugging =
it)
=E2=80=93 for me, the buildbot master did a good job of triggering the inte=
rlock by
writing lots of stuff to its SQLite database.

It would be great if some ZFS experts could take a look into this, now that=
 we
have a way to reproduce it. Since several people already claimed to have th=
is
problem, it remains a pretty risky issue for production.

(P.S. if you find non-best-practice things in the setup, I'm interested to =
hear
about it by short e-mail or @AndiDog87, just for the sake of learning)

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