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Date: Tue, 25 Jun 2013 13:44:06 +0200
From: Kristof Provost <kristof@sigsegv.be>
To: Thomas Steen Rasmussen <thomas@gibfest.dk>
Subject: Re: Reproducible ZFS jailed dataset panic after upgrading to latest
 9-stable
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On 2013-06-25 13:27:43 (+0200), Thomas Steen Rasmussen <thomas@gibfest.dk> wrote:
> Hello,
> 
> To fix the mmap vulnerability I've upgraded one of my jail hosts from:
> "FreeBSD 9.1-STABLE #1: Sun Mar 17 08:48:35 UTC 2013"
> to:
> "FreeBSD 9.1-STABLE #3: Tue Jun 18 12:49:39 UTC 2013"
> 
> One of the jails on this machine has a jailed zfs dataset:
> 
> $ zfs get jailed gelipool/backups
> NAME              PROPERTY  VALUE   SOURCE
> gelipool/backups  jailed    on      local
> $
> 
> After the upgrade, when I start the jail, the machine panics.
> 
> This is a remote zfs-only machine with swap on zfs, so far I have
> been unable to get a proper coredump. I have access to the
> console of the machine, and I have taken a couple of screenshots:
> 
> http://imgur.com/2V0PBlf and http://imgur.com/OopP9Sp
> 
> Any ideas what might have caused this ? It worked great before the
> upgrade to latest 9-STABLE. This is a production server, but I am
> willing to try any suggestions to get it working again.
> 
I think you're hitting the same issue as me and Alexander Leidinger.
Alexander said that the maintainer of the stress-test suite has managed
to create a test case to trigger the issue, so hopefully a fix will be
found soon.

http://docs.freebsd.org/cgi/getmsg.cgi?fetch=250572+0+/usr/local/www/db/text/2013/freebsd-current/20130616.freebsd-current

Regards,
Kristof