FC2 kernel oops, panic

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A machine I managed crashed today.  The console (25 lines) indicated a 
kernel fault in an interrupt handler.  After reboot, two pre-crash 
kernel oopses were in the log (see attached).  The commonality between 
the two seems to be a spin_lock being already locked in mm/slab.c.

The oops times were 10:43 and 11:01; the machine crashed somewhere 
between 11:01 and 11:10 judging by /var/log/cron (how can I get a more 
accurate time of crash?).

This machine is running FC2 kernel 2.6.8-1.521 #1 Mon Aug 16 09:01:18 
EDT 2004 i686 i686 i386.  The machine had been up for about two weeks 
(when it was first put in service with this OS installation), and there 
was no apparent unusual activity on it today.  It's an NFS fileserver.

Any ideas?  Is this likely a problem in the kernel, or with my hardware?

Thanks,
David
Oct 27 10:43:12 powraid kernel: Unable to handle kernel paging request at virtual address 00020004
Oct 27 10:43:12 powraid kernel:  printing eip:
Oct 27 10:43:12 powraid kernel: 02146bc4
Oct 27 10:43:12 powraid kernel: *pde = 00000000
Oct 27 10:43:12 powraid kernel: Oops: 0002 [#1]
Oct 27 10:43:12 powraid kernel: Modules linked in: nfs nfsd exportfs lockd md5 ipv6 autofs4 sunrpc tulip 8139too mii floppy sg microcode xfs ohci_hcd ehci_hcd button battery asus_acpi ac ext3 jbd dm_mod mptscsih mptbase sd_mod scsi_mod
Oct 27 10:43:12 powraid kernel: CPU:    0
Oct 27 10:43:12 powraid kernel: EIP:    0060:[<02146bc4>]    Not tainted
Oct 27 10:43:12 powraid kernel: EFLAGS: 00010006   (2.6.8-1.521) 
Oct 27 10:43:12 powraid kernel: EIP is at free_block+0x3a/0xbb
Oct 27 10:43:12 powraid kernel: eax: 00020000   ebx: 0204b000   ecx: 0204b080   edx: 05f9d080
Oct 27 10:43:12 powraid kernel: esi: 0f754a80   edi: 0000001b   ebp: 00000017   esp: 0c8fbacc
Oct 27 10:43:12 powraid kernel: ds: 007b   es: 007b   ss: 0068
Oct 27 10:43:12 powraid kernel: Process nfsd (pid: 2006, threadinfo=0c8fb000 task=0c928cd0)
Oct 27 10:43:12 powraid kernel: Stack: 0eaad090 0f754a80 0eaad090 0edac680 0f363d60 02146d1d 0000001b 0eaad080 
Oct 27 10:43:12 powraid kernel:        0eaad080 0eaad090 0edac680 00000206 02147143 0edac6b4 0c8fbb34 00000008 
Oct 27 10:43:12 powraid kernel:        00000000 0217e596 0edac6b4 0217e949 05f9d734 0000000a 02348c20 0217f079 
Oct 27 10:43:12 powraid kernel: Call Trace:
Oct 27 10:43:12 powraid kernel:  [<02146d1d>] cache_flusharray+0xd8/0x15a
Oct 27 10:43:12 powraid kernel:  [<02147143>] kmem_cache_free+0x21/0x2f
Oct 27 10:43:12 powraid kernel:  [<0217e596>] destroy_inode+0x36/0x45
Oct 27 10:43:12 powraid kernel:  [<0217e949>] dispose_list+0x4e/0x160
Oct 27 10:43:12 powraid kernel:  [<0217f079>] prune_icache+0x366/0x3a3
Oct 27 10:43:12 powraid kernel:  [<0217f0c3>] shrink_icache_memory+0xd/0x24
Oct 27 10:43:12 powraid kernel:  [<0214957b>] shrink_slab+0xf9/0x15c
Oct 27 10:43:12 powraid kernel:  [<0214abf5>] try_to_free_pages+0xa9/0x14e
Oct 27 10:43:12 powraid kernel:  [<021422af>] __alloc_pages+0x1c8/0x2be
Oct 27 10:43:12 powraid kernel:  [<0213f916>] generic_file_aio_write_nolock+0x502/0x855
Oct 27 10:43:12 powraid kernel:  [<109da583>] xfs_ichgtime+0xf4/0xfc [xfs]
Oct 27 10:43:12 powraid kernel:  [<109fec5a>] xfs_write+0x3e5/0x678 [xfs]
Oct 27 10:43:12 powraid kernel:  [<109fb43f>] linvfs_writev+0xdf/0x120 [xfs]
Oct 27 10:43:12 powraid kernel:  [<021d9ac7>] __copy_from_user_ll+0x41/0x4a
Oct 27 10:43:12 powraid kernel:  [<109fb360>] linvfs_writev+0x0/0x120 [xfs]
Oct 27 10:43:12 powraid kernel:  [<02160f4c>] do_readv_writev+0x15d/0x1de
Oct 27 10:43:12 powraid kernel:  [<02160aa5>] do_sync_write+0x0/0x99
Oct 27 10:43:12 powraid kernel:  [<10a95449>] fh_verify+0x497/0x4af [nfsd]
Oct 27 10:43:12 powraid kernel:  [<109fb606>] linvfs_open+0x39/0x3d [xfs]
Oct 27 10:43:12 powraid kernel:  [<02161875>] open_private_file+0x9c/0xb7
Oct 27 10:43:12 powraid kernel:  [<02161048>] vfs_writev+0x3d/0x41
Oct 27 10:43:12 powraid kernel:  [<10a9711a>] nfsd_write+0x112/0x2a6 [nfsd]
Oct 27 10:43:12 powraid kernel:  [<0211a930>] __wake_up_common+0x36/0x5b
Oct 27 10:43:12 powraid kernel:  [<0211a9e2>] __wake_up+0x8d/0xf2
Oct 27 10:43:12 powraid kernel:  [<10a9cff3>] nfsd3_proc_write+0xc7/0xde [nfsd]
Oct 27 10:43:12 powraid kernel:  [<10a9e6ae>] nfs3svc_decode_writeargs+0x0/0x159 [nfsd]
Oct 27 10:43:12 powraid kernel:  [<10a93a20>] nfsd_dispatch+0xbf/0x163 [nfsd]
Oct 27 10:43:12 powraid kernel:  [<10970ba9>] svc_process+0x323/0x562 [sunrpc]
Oct 27 10:43:12 powraid kernel:  [<10a93683>] nfsd+0x3ae/0x68c [nfsd]
Oct 27 10:43:12 powraid kernel:  [<10a932d5>] nfsd+0x0/0x68c [nfsd]
Oct 27 10:43:12 powraid kernel:  [<021041d9>] kernel_thread_helper+0x5/0xb
Oct 27 10:43:12 powraid kernel: Code: 89 50 04 89 02 31 d2 2b 4b 0c c7 03 00 01 10 00 c7 43 04 00 
Oct 27 10:43:13 powraid kernel:  mm/slab.c:2725: spin_lock(mm/slab.c:0f754ac4) already locked by mm/slab.c/2141
Oct 27 11:01:00 powraid kernel: Unable to handle kernel paging request at virtual address 00020004
Oct 27 11:01:00 powraid kernel:  printing eip:
Oct 27 11:01:00 powraid kernel: 02146aa1
Oct 27 11:01:00 powraid kernel: *pde = 00000000
Oct 27 11:01:00 powraid kernel: Oops: 0002 [#2]
Oct 27 11:01:00 powraid kernel: Modules linked in: nfs nfsd exportfs lockd md5 ipv6 autofs4 sunrpc tulip 8139too mii floppy sg microcode xfs ohci_hcd ehci_hcd button battery asus_acpi ac ext3 jbd dm_mod mptscsih mptbase sd_mod scsi_mod
Oct 27 11:01:00 powraid kernel: CPU:    0
Oct 27 11:01:00 powraid kernel: EIP:    0060:[<02146aa1>]    Not tainted
Oct 27 11:01:00 powraid kernel: EFLAGS: 00010046   (2.6.8-1.521) 
Oct 27 11:01:00 powraid kernel: EIP is at cache_alloc_refill+0x154/0x23d
Oct 27 11:01:00 powraid kernel: eax: 00020000   ebx: 0f754b80   ecx: 0cc75000   edx: 0f754b8c
Oct 27 11:01:00 powraid kernel: esi: 00000008   edi: 0f754b8c   ebp: 0f7ae080   esp: 0f267e08
Oct 27 11:01:00 powraid kernel: ds: 007b   es: 007b   ss: 0068
Oct 27 11:01:00 powraid kernel: Process bash (pid: 23727, threadinfo=0f267000 task=0d242640)
Oct 27 11:01:00 powraid kernel: Stack: 00000050 00000050 0f754b80 00000246 0f709000 02146de5 0042da8f 0f709000 
Oct 27 11:01:00 powraid kernel:        031f386c 108c69b3 0217e3f1 0042da8f 0f709000 031f386c 0042da8f 0217f5a0 
Oct 27 11:01:00 powraid kernel:        0042da8f 02d1aeb8 0f709000 02ff60f0 108c40e3 062b92e8 108d3fc0 02d1aeb8 
Oct 27 11:01:00 powraid kernel: Call Trace:
Oct 27 11:01:00 powraid kernel:  [<02146de5>] kmem_cache_alloc+0x46/0x4c
Oct 27 11:01:00 powraid kernel:  [<108c69b3>] ext3_alloc_inode+0xf/0x3c [ext3]
Oct 27 11:01:00 powraid kernel:  [<0217e3f1>] alloc_inode+0x13/0x182
Oct 27 11:01:00 powraid kernel:  [<0217f5a0>] get_new_inode_fast+0xf/0x21f
Oct 27 11:01:00 powraid kernel:  [<108c40e3>] ext3_lookup+0x42/0x89 [ext3]
Oct 27 11:01:00 powraid kernel:  [<0216ffe8>] real_lookup+0x73/0xde
Oct 27 11:01:00 powraid kernel:  [<0217034a>] do_lookup+0x43/0x72
Oct 27 11:01:00 powraid kernel:  [<02171039>] link_path_walk+0xcc0/0x1017
Oct 27 11:01:00 powraid kernel:  [<0217160b>] path_lookup+0xff/0x12f
Oct 27 11:01:00 powraid kernel:  [<02171747>] __user_walk+0x21/0x51
Oct 27 11:01:00 powraid kernel:  [<0216bac4>] vfs_stat+0x14/0x3a
Oct 27 11:01:00 powraid kernel:  [<0216c03f>] sys_stat64+0xf/0x23
Oct 27 11:01:00 powraid kernel:  [<021181a7>] do_page_fault+0x0/0x489
Oct 27 11:01:00 powraid kernel: Code: 89 50 04 89 02 66 83 79 14 ff c7 01 00 01 10 00 c7 41 04 00 
Oct 27 11:01:01 powraid kernel:  mm/slab.c:2656: spin_lock(mm/slab.c:0f754bc4) already locked by mm/slab.c/1921

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