linux-kernel - Re: [patch 1/3] fix illogical behavior in balance_dirty

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Date:	Tue, 03 Apr 2007 14:40:03 -0400
From:	Kris Corwin <Kris.Corwin@...com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3] fix illogical behavior in balance_dirty_pages()

I think I'm seeing the same VM behavior with NFS/ext3 that was described 
with fuse.

I have a shared storage unit with 2 servers.  The local filesystem is 
ext3 and I'm failing
the ext3 mounting and NFS serving from one node to another.  I'm running 
I/O on the NFS
mount point to the active server.   If I failover to the server that is 
also executing the I/O,
I can hang the machine.  Looking at the stack traces, the NFS writes are 
stuck in
balance_dirty_pages().  NFS start up is causing rpc.mountd to write to 
the local
ext3 filesystem, but it gets blocked in balance_dirty_pages() too.  
Deadlock.  Without
the NFS server successfully started, the kernel can't write the dirty pages.

I'm running a 2.6.9-42 RH kernel.  Early in my debugging, I had tried 
several kernel
versions.  All 2.6 kernels saw this behavior and the 2.4 kernel I tried 
did not.

Kris Corwin
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