NFS crash in linux-2.6.17-rc6-mm2; patch testd and works good.

[Linas Vepstas]

I saw a crash in 2.6.17-rc6-mm2 in the NFS code, w/ stack trace 

                   c00000000007efac .dec_zone_page_state+0x4/0xb0
[c00000003321bb60] c0000000001790f8 .nfs_commit_done+0x1a8/0x1f0
[c00000003321bc00] c00000000042169c .rpc_exit_task+0x48/0x84
[c00000003321bc80] c0000000004219b8 .__rpc_execute+0xec/0x2ac
[c00000003321bd20] c00000000005f57c .run_workqueue+0xdc/0x168
[c00000003321bdc0] c00000000005ff30 .worker_thread+0x138/0x1a8
[c00000003321bee0] c0000000000643f0 .kthread+0x124/0x174
[c00000003321bf90] c00000000002260c .kernel_thread+0x4c/0x68

which was passed a NULL pointer. This was on PowerPC. 

It appears that the patch of Tue, 13 Jun 2006 14:13:36 -0700 (PDT)
from Christoph Lameter seems to fix the probelm for me, after
some light testing. 

That is, the patch posted at  http://lkml.org/lkml/2006/6/13/210

So -- thanks -- and please add the appropriate Signed-Off-bys to 
that patch and get it upstream!

--linas

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