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Date:      Tue, 30 Apr 2019 16:18:07 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 236220] ZFS vnode deadlock on zfs_mknode
Message-ID:  <bug-236220-3630-dve76DB2fy@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-236220-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-236220-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236220

--- Comment #24 from ncrogers@gmail.com ---
(In reply to Dennis Noordsij from comment #23)
Yes, I have a few systems that have about a 6 week uptime now after applying
the patch, and many more running the same patch with uptimes less than a mo=
nth
because that's about when I started upgrading more systems. It does seem to
take up to a few weeks to manifest itself but I feel like I have enough sys=
tems
running this now that it would have happened.

In my experience it doesn't seem to matter if its a small workload or a huge
workload, eventually it strikes. My guess is the problem is unique to somet=
hing
strange with how PostgreSQL handles its WAL but I have no idea what that wo=
uld
be. I have full_page_writes OFF, synchronous_commit OFF, and fsync ON in my
postgresql conf. Running PostgreSQL 11.2.

I will definitely report back if I witness a hang/crash. Perhaps it would be
useful for someone to open up an issue with PostgreSQL? I am less familiar =
with
their bug reporting process. But given that there is definitively a bug in a
feature borrowed  from ZoL that was later fixed in ZoL upstream, it seems l=
ike
this is more of a FreeBSD problem, so I am not sure if PostgreSQL devs will
have much to say other than to perhaps help pinpoint why this is only happe=
ning
to postgres users?

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