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Date:      Wed, 10 Mar 2010 19:04:01 +0100
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        Andriy Gapon <avg@icyb.net.ua>
Cc:        freebsd-fs@FreeBSD.org, FreeBSD Stable <freebsd-stable@FreeBSD.org>, Borja Marcos <borjam@sarenet.es>
Subject:   Re: Many processes stuck in zfs
Message-ID:  <20100310180401.GG1715@garage.freebsd.pl>
In-Reply-To: <4B97DA13.1040900@icyb.net.ua>
References:  <864468D4-DCE9-493B-9280-00E5FAB2A05C@lassitu.de> <20100309122954.GE3155@garage.freebsd.pl> <EC9BC6B4-8D0E-4FE3-852F-0E3A24569D33@sarenet.es> <20100309125815.GF3155@garage.freebsd.pl> <CB854F58-03AF-46DD-8153-85FA96037C21@sarenet.es> <BFF1E2D6-B48A-4A5E-ACEE-8577FDB07820@sarenet.es> <20100310110202.GA1715@garage.freebsd.pl> <E04F91AA-B2C4-4166-A24A-74F1BEF01519@sarenet.es> <20100310173143.GD1715@garage.freebsd.pl> <4B97DA13.1040900@icyb.net.ua>

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On Wed, Mar 10, 2010 at 07:42:43PM +0200, Andriy Gapon wrote:
> on 10/03/2010 19:31 Pawel Jakub Dawidek said the following:
> > This should be impossible. If we are that deep in zfsvfs_teardown(), it=
 means
> > that we hold the z_teardown_lock exclusively. And we do as 'show allloc=
ks'
> > output confirms. But if we are holding this lock exclusively we shouldn=
't be
> > that deep in create code path, because we need hold this lock as reader.
> > It isn't visible in 'show alllocks' output, because this lock is special
> > (rrwlock.c).
>=20
> BTW, it seems that our 'stock' rwlock implements exactly the same thing as
> rrwlock.c - recursive readers, etc.

But you cannot sleep while holding our rwlock(9).

--=20
Pawel Jakub Dawidek                       http://www.wheelsystems.com
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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