I just hit this bug on:

Linux EMP 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26
UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

May 28 22:23:01 sentinel kernel: [728916.706084] kernel BUG at 
/build/buildd/linux-lts-quantal-3.5.0/fs/jfs/jfs_metapage.c:752!
May 28 22:23:02 sentinel kernel: [728917.489239]  ffff8808354fee48 
ffff88017b2d5c50 ffff88017b2d5bc8 ffffffffa0561b99
May 28 22:23:03 sentinel kernel: [728917.991960]  [<ffffffff811928e5>] ? 
putname+0x35/0x50May 28 22:23:03 sentinel kernel: [728918.190811] Code: 74 b4 
4c 89 e7 e8 84 df bc e0 eb aa 48 c7 c1 a5 58 56 a0 ba f0 02 00 00 48 c7 c
6 80 68 56 a0 48 c7 c7 af 58 56 a0 e8 28 c7 12 e1 <0f> 0b 4c 89 e7 e8 59 df bc 
e0 e9 b6 fe ff ff 0f 0b 66 90 55 48 
May 28 22:23:03 sentinel kernel: [728918.352408]  RSP <ffff88017b2d5b78>
May 29 01:10:38 sentinel kernel: [738968.427593] RAX: 0000000000000058 RBX: 
ffff8808b7230f80 RCX: 00000000ffffffff
May 29 01:10:39 sentinel kernel: [738969.926073] Code: 74 b4 4c 89 e7 e8 84 df 
bc e0 eb aa 48 c7 c1 a5 58 56 a0 ba f0 02 00 00 48 c7 c
6 80 68 56 a0 48 c7 c7 af 58 56 a0 e8 28 c7 12 e1 <0f> 0b 4c 89 e7 e8 59 df bc 
e0 e9 b6 fe ff ff 0f 0b 66 90 55 48 
May 29 01:20:10 sentinel kernel: [739541.032392] page flags: 
0xa0000000000080c(referenced|uptodate|private)
May 29 01:20:12 sentinel kernel: [739542.873114]  [<ffffffff811b2be0>] ? 
wb_do_writeback+0x1d0/0x1d0
May 29 01:20:12 sentinel kernel: [739542.972947]  [<ffffffff816a8324>] 
kernel_thread_helper+0x4/0x10
May 29 01:20:14 sentinel kernel: [739544.442600]  [<ffffffff81131312>] ? 
mapping_tagged+0x12/0x20
May 29 01:20:15 sentinel kernel: [739545.303295] invalid opcode: 0000 [#3] SMP 
May 29 01:20:16 sentinel kernel: [739546.567635] Stack:
May 29 01:20:16 sentinel kernel: [739546.886219]  [<ffffffffa055fcf3>] 
jfs_lazycommit+0x183/0x200 [jfs]
May 29 01:20:16 sentinel kernel: [739546.992457]  [<ffffffffa055fb70>] ? 
txCommit+0x360/0x360 [jfs]
May 29 01:20:17 sentinel kernel: [739547.491752] ---[ end trace 
45a860a9cb63ff31 ]---

This appeared to happen as the underlying device is flakey and removed
itself from the system forcefully, but reattached a moment later. (Was
across a USB 3.0 channel.)

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https://bugs.launchpad.net/bugs/541887

Title:
  BUG in jfs_metapage.c

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