Re: XFS or Kernel Problem / Bug

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Stefan Priebe - FH wrote:
> Sorry that is not possible - cause it is a production machine.
>
> But i've catched the error and the files from another machine -
> perhaps this helps.
>
> "BUG: unable to handle kernel NULL pointer dereference at virtual
> address 00000288"
> " printing eip:"
> "c0142ff7"
> "*pde = 00000000"
> "Oops: 0000 [#1]"
> "SMP "
> "Modules linked in: iptable_filter ip_tables x_tables"
> "CPU:    0"
> "EIP:    0060:[<c0142ff7>]    Not tainted VLI"
> "EFLAGS: 00010246   (2.6.18.6 #1) "
> "EIP is at generic_file_buffered_write+0x390/0x6cf"
> "eax: 00000000   ebx: 000001ec   ecx: ea029a40   edx: 00008002"
> "esi: 00000000   edi: e3b28c9c   ebp: 000001ec   esp: dd04bd18"
> "ds: 007b   es: 007b   ss: 0068"
> "Process proftpd (pid: 3615, ti=dd04a000 task=eba88a70 task.ti=dd04a000)"
> "Stack: e3b28d44 00000001 00000010 000001fc c036d793 000001fc c14765c0
> 00000010 "
> "       080d404c 000001ec e3b28c9c c03e78c0 e3b28d44 ea029a40 000001fc
> 00000000 "
> "       00000000 000001ec dd04beac 00d420b1 00000000 00000000 dd04bd80
> 45b1fa67 "
> "Call Trace:"
> " [<c036d793>] sock_def_readable+0x7f/0x81"
> " [<c017a03a>] file_update_time+0xad/0xcb"
> " [<c0232015>] xfs_iunlock+0x55/0x9f"
> " [<c0262eeb>] xfs_write+0xa74/0xc61"
> " [<c036a253>] sock_aio_read+0x95/0x99"
> " [<c025d9fb>] xfs_file_aio_write+0x8f/0xa0"
> " [<c015fb94>] do_sync_write+0xc9/0x10f"
> " [<c0133ad6>] autoremove_wake_function+0x0/0x57"
> " [<c015f3d5>] generic_file_llseek+0x95/0xbc"
> " [<c015facb>] do_sync_write+0x0/0x10f"
> " [<c015fc80>] vfs_write+0xa6/0x179"
> " [<c015fe24>] sys_write+0x51/0x80"
> " [<c0102d3f>] syscall_call+0x7/0xb"
> "Code: 04 89 10 8b 44 24 40 85 c0 0f 85 db 00 00 00 8b 5c 24 24 85 db
> 0f 88 c3 00 00 00 8b 4c 24 34 8b 51 18 f6 c6 10 75 73 8b 7c 24 28 <8b>
> 85 9c 00 00 00 f6 40 30 10 75 63 f6 87 48 01 00 00 01 75 5a "
> "EIP: [<c0142ff7>] generic_file_buffered_write+0x390/0x6cf SS:ESP
> 0068:dd04bd18"
>
> Files:
> http://server113-han.de-nserver.de/filemap.s
> http://server113-han.de-nserver.de/filemap.o
>
You seem to have some kind of hardware/memory problem.

Disassembly of the failing instruction from the oops:

     8b 7c 24 28               mov    0x28(%esp),%edi
     8b 85 9c 00 00 00         mov    0x9c(%ebp),%eax   <=====

Dump of the object code:

           8b 7c 24 28             mov    0x28(%esp),%edi
           8b 87 9c 00 00 00       mov    0x9c(%edi),%eax

Looks like a bit is flipped.

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