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Date:      Wed, 16 Dec 2015 13:14:29 +0100
From:      Bengt Ahlgren <bengta@sics.se>
To:        Andriy Gapon <avg@FreeBSD.org>
Cc:        Steven Hartland <killing@multiplay.co.uk>, freebsd-fs@FreeBSD.org
Subject:   Re: ZFS hang in zfs_freebsd_rename
Message-ID:  <uh7vb7ylhei.fsf@P142s.sics.se>
In-Reply-To: <56714344.1070908@FreeBSD.org> (Andriy Gapon's message of "Wed, 16 Dec 2015 12:56:04 %2B0200")
References:  <uh7a8pbj2mo.fsf@P142s.sics.se> <567022FB.1010508@multiplay.co.uk> <uh7vb7zhihv.fsf@P142s.sics.se> <56714344.1070908@FreeBSD.org>

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Andriy Gapon <avg@FreeBSD.org> writes:

> On 15/12/2015 16:52, Bengt Ahlgren wrote:
>> So this is likely fixed then in 10.x?
>
> No and neither in head / current.  We haven't had any fixes in ZFS<->VFS code
> for quite a long while.
> And this is a FreeBSD-specific problem.  zfs_rename() does not behave as
> VOP_RENAME should do with respect to the vnode locking.

OK, good to know.  I assume this means that it would be beneficial to
extract more information if this deadlock happens again, regardless of
whether or not I have had the time to upgrade to 10.x.

Bengt



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