Description of problem:

First ... as this is an old machine (single p3/600, 440GX board, 512mb ecc ram) 
it is entirely possible that this is a hardware problem. I'm reporting it just 
in case it is not ...

This machine has 4 scsi disks configured in two md mirrors and lvm2 on top of 
them. This volume is then split in logical volumes for /, /var and /home (/boot 
is dedicated small mirror at the beginning of the first two disks).

While doing a bonnie++ run on /home, I started a small compile (powerdns) on / 
and was soon greeted with this oops:

Jun  6 13:18:03 klotilda kernel: Assertion failure in __journal_remove_journal_
head() at fs/jbd/journal.c:1772: "buffer_jbd(bh)"
Jun  6 13:18:03 klotilda kernel: ------------[ cut here ]------------
Jun  6 13:18:03 klotilda kernel: kernel BUG at fs/jbd/journal.c:1772!
Jun  6 13:18:03 klotilda kernel: invalid operand: 0000 [#1]
Jun  6 13:18:03 klotilda kernel: Modules linked in: parport_pc lp parport md5 
ipv6 autofs4 i2c_dev i2c_core sunrpc uhci_hcd
e100 mii floppy sg dm_snapshot dm_zero dm_mirror ext3 jbd raid1 dm_mod aic7xxx 
sd_mod scsi_mod
Jun  6 13:18:03 klotilda kernel: CPU:    0
Jun  6 13:18:03 klotilda kernel: EIP:    0060:[<e08bb7f0>]    Not tainted VLI
Jun  6 13:18:03 klotilda kernel: EFLAGS: 00010212   (2.6.9-34.0.1.EL)
Jun  6 13:18:03 klotilda kernel: EIP is at __journal_remove_journal_head+0x86/0x
120 [jbd]
Jun  6 13:18:03 klotilda kernel: eax: 00000063   ebx: d6d307dc   ecx: e08bd
080   edx: dfcf8e00
Jun  6 13:18:03 klotilda kernel: esi: caeed48c   edi: d6d307dc   ebp: caeed48
c   esp: dfcf8dfc
Jun  6 13:18:03 klotilda kernel: ds: 007b   es: 007b   ss: 0068
Jun  6 13:18:03 klotilda kernel: Process kswapd0 (pid: 34, threadinfo=dfcf8000 
task=dfdcc620)
Jun  6 13:18:03 klotilda kernel: Stack: e08bd080 e08bbd97 e08bcfcc 000006ec e08
bd5a8 caeed48c d6d307dc e08bb926
Jun  6 13:18:03 klotilda kernel:        caeed48c c101c8a0 e08b3b4b 00000000 c14f
0c00 e08ec9c0 000000d0 dac7da60
Jun  6 13:18:03 klotilda kernel:        dfcf8f58 c016bf06 dac7da60 c101c8a0 c
015327d 00000001 00000001 00000002
Jun  6 13:18:03 klotilda kernel: Call Trace:
Jun  6 13:18:03 klotilda kernel:  [<e08bb926>] journal_put_journal_head+0x64/0x
83 [jbd]
Jun  6 13:18:03 klotilda kernel:  [<e08b3b4b>] journal_try_to_free_buffers+0x8c/
0xc3 [jbd]
Jun  6 13:18:03 klotilda kernel:  [<e08ec9c0>] ext3_releasepage+0x0/0x54 [ext3]
Jun  6 13:18:03 klotilda kernel:  [<c016bf06>] try_to_release_page+0x34/0x46
Jun  6 13:18:03 klotilda kernel:  [<c015327d>] shrink_list+0x294/0x4ea
Jun  6 13:18:03 klotilda kernel:  [<c01536d2>] shrink_cache+0x1ff/0x454
Jun  6 13:18:03 klotilda kernel:  [<c0152d91>] shrink_slab+0x7d/0x14c
Jun  6 13:18:03 klotilda kernel:  [<c015408c>] shrink_zone+0x8f/0x9e
Jun  6 13:18:03 klotilda kernel:  [<c015442f>] balance_pgdat+0x197/0x2cb
Jun  6 13:18:03 klotilda kernel:  [<c015461c>] kswapd+0xb9/0xbb
Jun  6 13:18:03 klotilda kernel:  [<c011e867>] autoremove_wake_function+0x0/0x2d
Jun  6 13:18:04 klotilda kernel:  [<c031139a>] ret_from_fork+0x6/0x14
Jun  6 13:18:04 klotilda kernel:  [<c011e867>] autoremove_wake_function+0x0/0x2d
Jun  6 13:18:04 klotilda kernel:  [<c0154563>] kswapd+0x0/0xbb
Jun  6 13:18:04 klotilda kernel:  [<c01041dd>] kernel_thread_helper+0x5/0xb
Jun  6 13:18:04 klotilda kernel: Code: 0f 85 bc 00 00 00 8b 06 f6 c4 20 75 29 
68 a8 d5 8b e0 68 ec 06 00 00 68 cc cf 8b e0 68 97 bd 8b e0 68 80 d0 8b e0 e8 
21 61 86 df <0f> 0b ec 06 cc cf 8b e0 83 c4 14 39 33 74 29 68 b7 d5 8b e0 68



Version-Release number of selected component (if applicable):
kernel 2.6.9-34.0.1.EL on rhel4 with all recent updates


How reproducible:
Not sure yet if this is reproducible. If it is a hardware problem, I guess I'll 
see more weird behaviour ... but if it is not, I hope I'll get more of the same.

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

Memtest86 runs on this machie for 24h without any errors.