Re: NFS write OOPS with 2.6.29.2

[Holger Kiehl]

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@xxxxxx> 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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