linux-kernel - Re: 2.6.34 nfs fsync() deadlock

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Message-ID: <1275320467.5038.9.camel@heimdal.trondhjem.org>
Date:	Mon, 31 May 2010 11:41:07 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Nix <nix@...eri.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Linux NFS Mailing List <nfs@...ts.sourceforge.net>
Subject: Re: 2.6.34 nfs fsync() deadlock

On Mon, 2010-05-31 at 15:41 +0100, Nix wrote:
> I just got a deadlock while doing a postgresql 'make check' on an NFSv3
> TCP mount (the server is Linux 2.6.34 as well; the underlying filesystem
> is ext4). This testsuite is notable for doing a lot of things in
> parallel, each of which is generally doing a lot of fsync()ing.
> 
> /proc/mounts for the filesystem of discourse:
> 
> package.srvr.nix:/usr/src /usr/src nfs rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.14.15,mountvers=3,mountport=50892,mountproto=udp,addr=192.168.14.15 0 0
> 
> /etc/exports for it on the server:
> 
> /usr/src mutilate(rw,no_root_squash,no_subtree_check,async)
> 
> dmesg:

Can you see if the following 2 attached patches (already sent to
stable@...nel.org) suffice to fix the hang?

Cheers
  Trond

View attachment "0001-NFS-Ensure-that-we-mark-the-inode-as-dirty-if-we-exi.patch" of type "text/x-patch" (1790 bytes)

View attachment "0002-NFS-Fix-another-nfs_wb_page-deadlock.patch" of type "text/x-patch" (1436 bytes)