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SubjectRe: NFS oops in 2.6.26rc4
On Fri, May 30, 2008 at 01:59:12PM -0400, Chuck Lever wrote:

> > When trying to mount an nfs export, I got this oops..
> >
> > BUG: unable to handle kernel paging request at f4569000
> > IP: [<f8daac01>] :sunrpc:xdr_encode_opaque_fixed+0x2d/0x69
> > *pde = 34c23163 *pte = 34569160
> > Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
> > Modules linked in: nfs nfsd lockd nfs_acl auth_rpcgss exportfs sunrpc ext2 sg button via_rhine via_ircc pcspkr r8169 mii pata_sil680 irda crc_ccitt i2c_viapro i2c_core dm_snapshot dm_zero dm_mirror dm_log dm_mod pata_via ata_generic pata_acpi libata sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: scsi_wait_scan]
> > ...
> > Code: e5 57 56 89 d6 53 83 ec 04 85 c9 89 45 f0 89 c8 74 4c 8d 59 03 c1 eb 02 8d 14 9d 00 00 00 00 29 ca 85 f6 74 11 c1 e9 02 8b 7d f0 <f3> a5 89 c1 83 e1 03 74 02 f3 a4 85 d2 74 1b 8b 7d f0 89 d1 c1
> > EIP: [<f8daac01>] xdr_encode_opaque_fixed+0x2d/0x69 [sunrpc] SS:ESP 0068:f4566a68
> > ---[ end trace a8a691a45122c25a ]---
> > mount.nfs used greatest stack depth: 812 bytes left
>
> The last line suggests you are trying this with 4KB kernel stacks. I
> have patches queued for .27 that provide some stack relief in this
> code path. If you hit this often, you might want to try with 8KB
> stacks to see if that helps.

Yes, Fedora kernels have been using 4K stacks for some time.
From the trace though, it doesn't look like we actually ran out of
stack space ?

> In the meantime, the traceback is a little funky, so I can't see
> directly what the root cause is. Can you provide the full command
> line of the mount command that caused this?

mount point in the fstab is ..

gelk:/mnt/data /mnt/nfs/gelk nfs nfsvers=3,tcp 0 0

> What "brand" of server were you trying to mount?

It's just another linux box. A no-name core2 duo, running 2.6.25.

> How often can you reproduce this?

Seems to do it every time I ask it to.

Dave

--
http://www.codemonkey.org.uk


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