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From: George Hartzell <hartzell@alerce.com>
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Date: Wed, 7 Aug 2013 16:38:17 -0700
To: Andriy Gapon <avg@FreeBSD.org>
Subject: Re: Help with filing a [maybe] ZFS/mmap bug.
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Andriy Gapon writes:
 > on 18/07/2013 20:44 George Hartzell said the following:
 > > Andriy Gapon writes:
 > >  > on 17/07/2013 23:47 George Hartzell said the following:
 > >  > > How should I move forward with this?
 > >  > 
 > >  > Could you please try to reproduce this problem using a kernel built with
 > >  > INVARIANTS options?
 > > 
 > > I added INVARIANT_SUPPORT and INVARIANTS options to the GENERIC
 > > kernel, rebuilt it, installed it and running through my "test case"
 > > generated a lot of invalid flac files.  I"m not sure what the options
 > > are/were supposed to do though, it looks like they generally lead to
 > > KASSERTS, which lead to abort()'s.  Nothing in /var/log/messages or on
 > > the console.
 > 
 > George,
 > 
 > do you have anything new on this issue?

Since the message that you quoted I narrowed down my "test case"
somewhat but I have not yet produced a stand-alone tool that
reproduces it (you still have to go through picard et al.).

 > Could you please try the following patch?
 > http://people.freebsd.org/~avg/zfs-putpages.diff
 > 
 > I expect it to not really fix the issue, but it may help to narrow it down.
 > Please keep INVARIANTS.

Absolutely.  Probably not until the weekend, but I'll give it a go.

Thanks for following up.

g.