linux-kernel - Re: NFS write OOPS with 2.6.29.2

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Date:	Mon, 11 May 2009 09:24:15 +0000 (GMT)
From:	Holger Kiehl <Holger.Kiehl@....de>
To:	Trond Myklebust <trond.myklebust@....uio.no>
cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-nfs@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: NFS write OOPS with 2.6.29.2

On Sun, 10 May 2009, Trond Myklebust wrote:

> On Sat, 2009-05-09 at 19:16 +0000, Holger Kiehl wrote:
>> On Mon, 4 May 2009, Andrew Morton wrote:
>>
>>>
>>> (cc linux-nfs)
>>>
>>> On Sun, 3 May 2009 16:03:38 +0000 (GMT) Holger Kiehl <Holger.Kiehl@....de> wrote:
>>>
>>>> Hello
>>>>
>>>> With plain kernel 2.6.29.2 I get the following OOPS (several of them) when
>>>> writing lots of small files on the client system:
>>>>
>>>>     May  3 18:48:34 obelix kernel: ------------[ cut here ]------------
>>>>     May  3 18:48:34 obelix kernel: kernel BUG at fs/nfs/write.c:252!
>>>
>>> I think this is a well-know bug, and fixes should be available in 2.6.29.3?
>>>
>> Thanks for this information. I just tried 2.6.29.3 and it still oopses.
>> Are there any patches I can try?
>
> The attached backports against 2.6.29 are untested, but they are known
> to compile at least. Could you give them a try?
>
Thanks. They do compile but when there is a mmap on the NFS drive the
program gets a SIGBUS:

    unlink("/home/afdbench/afd2/fifodir/AFD_ACTIVE") = 0
    close(3)                                = 0
    open("/home/afdbench/afd2/fifodir/AFD_ACTIVE", O_RDWR|O_CREAT|O_TRUNC|O_CLOEXEC, 0600) = 3
    lseek(3, 78, SEEK_SET)                  = 78
    write(3, "\377"..., 1)                  = 1
    mmap(NULL, 78, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0x7f8045cdb000
    --- SIGBUS (Bus error) @ 0 (0) ---

This was with 2.6.29.3 plus the patches you send me.

Holger
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