Re: 2.6.21.14 NFS related oops

[Trond Myklebust <trond.myklebust@fys.uio.no>]

On Sat, 2007-06-16 at 11:26 +0200, Maciej Sołtysiak wrote:
> >>  =======================
> >> Code: 10 89 5c 24 10 89 c3 89 7c 24 18 89 d7 89 74 24 14 8b 70 28 75 1a 
> >> 8b
> >> 4e 08 89 fa 89 d8 ff 51 18 8b 5c 24 10 83 74 24 14 8b 7c 24 <18> 83 c4 1c 
> >> c3
> >> 89 74 24 0c 8b 40 10 8b 40 24 8b 40 10 8b 40 08 EIP: [<f0a93c94>]
> >> rpcauth_checkverf+0x34/0x70 [sunrpc] SS:ESP 0068:e64b5eec
> >
> > At a first guess, it looks as though something has scribbled over your
> > credential. Have you tried running this kernel with slab debugging
> > enabled?
> 
> I'm running 2.6.21.5 now with slab debugging on, here's what I got about
> slab corruption:
> 
> Slab corruption: skbuff_head_cache start=ef287b78, len=164
> Redzone: 0x5a2cf071/0x5a2cf071.
> Last user: [<c031710c>](kfree_skbmem+0x3c/0x90)
> 090: 6b 6b 6b 6b 6b 63 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> Single bit error detected. Probably bad RAM.
> Run memtest86+ or a similar memory test tool.
> Prev obj: start=ef287ac8, len=164
> Redzone: 0x170fc2a5/0x170fc2a5.
> Last user: [<c031798b>](__alloc_skb+0x2b/0x100)
> 000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 010: 00 00 00 00 e0 71 e6 ef 00 00 00 00 00 00 00 00
> Next obj: start=ef287c28, len=164
> Redzone: 0x170fc2a5/0x170fc2a5.
> Last user: [<c031798b>](__alloc_skb+0x2b/0x100)
> 000: 84 d0 85 c5 84 d0 85 c5 04 d0 85 c5 2c 0a 73 46
> 010: 6f cd 09 00 00 00 00 00 01 00 00 00 08 e5 72 ee
> 
> How probable is that it is really a bad memory issue?
> Does this report say anything about which RAM chip I should
> investigate/replace ? I have 1x512MB+1x256MB
> 
> Best Regards,
> Maciej

I'd try doing as suggested above: run memtest86 on the computer for a
couple of hours and see what it tells you. That should hopefully give
you enough information to figure out which chips need replacing.

Cheers
  Trond