NFS oops with 2.6.4 server / Solaris 2.8 client

From: Peter Clay
Date: Fri Apr 16 2004 - 09:11:16 EST

I have this oops with the situation described in the subject, using the Solaris
automounter in /net to access the Linux server. This is repeatable. It doesn't
always crash the machine, but fairly soon after I end up with all the nfsd
processes stuck in 'D' state. What other debugging information would help find
this problem?

(output of dmesg follows)

nfs warning: mount version older than kernel
RPC request reserved 0 but used 112
Unable to handle kernel NULL pointer dereference at virtual address 00000004
printing eip:
*pde = 00000000
Oops: 0002 [#1]
CPU: 0
EIP: 0060:[<c02a91c0>] Not tainted
EFLAGS: 00010287
EIP is at do_tcp_sendpages+0x660/0xbf0
eax: 00000000 ebx: ddc5cb80 ecx: 00000008 edx: 00000000
esi: 00000001 edi: cfd0d9c8 ebp: d0632100 esp: dd0dbe34
ds: 007b es: 007b ss: 0068
Process nfsd (pid: 1366, threadinfo=dd0da000 task=dd100d40)
Stack: 000000b0 000000d0 c014d61a dd19670c dd0dbe70 c01c7efd d0632110 00000000
00000008 00000000 00000000 00000000 000005b4 00007530 00000000 cfd0d800
00000008 00000000 c02a97d9 cfd0d800 dd0dbeac 00000000 00000008 00000000
Call Trace:
[<c014d61a>] close_private_file+0x2a/0x30
[<c01c7efd>] nfsd_close+0x1d/0x40
[<c02a97d9>] tcp_sendpage+0x89/0xa0
[<c02e8343>] svc_sendto+0x173/0x2b0
[<c01d0e28>] encode_post_op_attr+0x1c8/0x260
[<c02e941c>] svc_tcp_sendto+0x6c/0xc0
[<c02e9bbc>] svc_send+0xbc/0x100
[<c02eb828>] svcauth_unix_release+0x58/0x60
[<c02e7858>] svc_process+0x1b8/0x640
[<c01c43b0>] nfsd+0x190/0x300
[<c01c4220>] nfsd+0x0/0x300
[<c0108c49>] kernel_thread_helper+0x5/0xc

Code: ff 42 04 8b 83 a8 00 00 00 8b 6c 24 28 8d 04 f0 89 68 10 8d

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