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Date:      Fri, 03 Feb 2017 23:02:17 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-fs@FreeBSD.org
Subject:   [Bug 216586] zfs panic: sa.sa_magic == 0x2F505A in zfs_space_delta_cb()
Message-ID:  <bug-216586-3630-742BFKQnLx@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-216586-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-216586-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216586

--- Comment #4 from johannes@jo-t.de ---
Thanks Andriy.

There are indeed lots of (very) old files there. I had an earlier snapshot =
from
a few years ago (that refs all these files). Deleted all files in the fs, a=
nd
rsync'd everything anew. No panic.

I've also tried (first rolling back to the old snapshot with all old files
present) rsync with either --xattrs present or not. Panics for both cases.
But the time until panic varies a lot. So looks like a race condition.

Question is now, is there bogus data (old format that wasn't properly upgra=
ded
on-the-fly) with the correct checksum on the disk, and the current code tri=
ps
over it.
Or is the race condition still present when it tries to on-the-fly-upgrade =
old
files?

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