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Date: Thu, 23 Feb 2012 21:20:36 +0100
From: Florian Smeets <flo@FreeBSD.org>
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To: Gleb Kurtsou <gleb.kurtsou@gmail.com>
References: <4F358F01.1090508@FreeBSD.org> <20120211102006.GA1274@reks>
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Cc: decke@FreeBSD.org, Konstantin Belousov <kib@FreeBSD.org>,
	"current@freebsd.org" <current@FreeBSD.org>
Subject: Re: Processes getting stuck in state tmpfs
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On 11.02.12 11:20, Gleb Kurtsou wrote:
> On (10/02/2012 22:41), Florian Smeets wrote:
>> Hi,
>>
>> if you set WRKDIRPREFIX to a tmpfs mountpoint and try to build audio/g=
sm
>> from ports one of the mv processes gets stuck in state tmpfs quite
>> often. Traces from a kernel with WITTNESS and DEBUG_VFS_LOCKS are
>> available here http://tb.smeets.im/~flo/tmpfs.txt
>=20
> It's because of incorrect vnode locking order in tmpfs_rename. Issue is=

> known and tmpfs is not the only file system suffering from it (e.g. ext=
2).
>=20
> There two ways of working around it in tree:
> * UFS: try locking vnode, unlock all vnodes on failure, restart,
> relookup vnodes needed.
> * ZFS: introduce directory entry locks to guarantee fvp won't disappear=
,
> fdvp can be safely traversed, etc. That won't be easy..
>=20
> UFS-way would be a good temporal solution, but I think we should work o=
n
> improving VOP_RENAME() in a long run.
>=20
> I'll try to prepare a patch in several days.
>=20

Hey Gleb,

did you get anywhere with this?

Thanks,
Florian


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