The following was seen on the console on ipp025 on 2011-01-07 Power cycled by bills

<Jan/07 01:02 am>[6801637.087360] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
<Jan/07 01:02 am>[6801637.087360] IP: [<ffffffff8022dfe5>] __wake_up_common+0x28/0x74
<Jan/07 01:02 am>[6801637.087360] PGD 18e534067 PUD 1ec5c2067 PMD 0 

<Jan/07 01:02 am>[6801637.087360] Oops: 0000 [#1] SMP 
<Jan/07 01:02 am>[6801637.087360] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
<Jan/07 01:02 am>[6801637.087360] CPU 3 
<Jan/07 01:02 am>[6801637.087360] Modules linked in: autofs4 smsc37b787_wdt k8temp forcedeth i2c_nforce2 i2c_core tg3 libphy e1000 xfs dm_snapshot dm_mirror dm_region_hash dm_log aacraid 3w_9xxx 3w_xxxx atp870u arcmsr aic7xxx scsi_wait_scan
<Jan/07 01:02 am>[6801637.087360] Pid: 3168, comm: xfslogd/3 Not tainted 2.6.28-rc7-00105-gfeaf384 #4
<Jan/07 01:02 am>[6801637.087360] RIP: 0010:[<ffffffff8022dfe5>]  [<ffffffff8022dfe5>] __wake_up_common+0x28/0x74
<Jan/07 01:02 am>[6801637.087360] RSP: 0018:ffff88012e0a7ce0  EFLAGS: 00010097
<Jan/07 01:02 am>[6801637.087360] RAX: 0000000000000286 RBX: ffff880046a36c58 RCX: 0000000000000000
<Jan/07 01:02 am>[6801637.087360] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff880046a36c58
<Jan/07 01:02 am>[6801637.087360] RBP: ffff88012e0a7d10 R08: ffffffffffffffe8 R09: 0000000000000001
<Jan/07 01:02 am>[6801637.087360] R10: 0000000000000000 R11: ffffffff8039d94e R12: 0000000000000000
<Jan/07 01:02 am>[6801637.087360] R13: 0000000000000000 R14: ffff880046a36c58 R15: 0000000000000000
<Jan/07 01:02 am>[6801637.087360] FS:  00007f4be179e6f0(0000) GS:ffff88022fa3e880(0000) knlGS:0000000000000000
<Jan/07 01:02 am>[6801637.087360] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
<Jan/07 01:02 am>[6801637.087360] CR2: 0000000000000000 CR3: 000000022c4d1000 CR4: 00000000000006e0
<Jan/07 01:02 am>[6801637.087360] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<Jan/07 01:02 am>[6801637.087360] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
<Jan/07 01:02 am>[6801637.087360] Process xfslogd/3 (pid: 3168, threadinfo ffff88012e0a6000, task ffff88012e47cbf0)
<Jan/07 01:02 am>[6801637.087360] Stack:
<Jan/07 01:02 am>[6801637.087360]  0000000300000000 ffff880046a36c58 0000000000000000 0000000000000000
<Jan/07 01:02 am>[6801637.087360]  0000000000000286 0000000000000003 ffff88012e0a7d50 ffffffff8022f03e
<Jan/07 01:02 am>[6801637.087360]  ffffffffffffff6e ffff8800945aa301 0000000000000000 ffff880046a36c00

<Jan/07 01:02 am>[6801637.087360] Call Trace:
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff8022f03e>] __wake_up+0x38/0x4e
<Jan/07 01:02 am>[6801637.087360]  [<ffffffffa00b042f>] xfs_buf_item_unpin+0x25/0xa4 [xfs]
<Jan/07 01:02 am>[6801637.087360]  [<ffffffffa00d50d3>] ? xfs_trans_chunk_committed+0xba/0xf0 [xfs]
<Jan/07 01:02 am>[6801637.087360]  [<ffffffffa00d514d>] ? xfs_trans_committed+0x44/0xd2 [xfs]
<Jan/07 01:02 am>[6801637.087360]  [<ffffffffa00ca407>] ? xlog_state_do_callback+0x169/0x281 [xfs]
<Jan/07 01:02 am>[6801637.087360]  [<ffffffffa00e079c>] ? xfs_buf_iodone_work+0x0/0x74 [xfs]
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff80248973>] ? run_workqueue+0xed/0x1ed
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff8024891d>] ? run_workqueue+0x97/0x1ed
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff80249511>] ? worker_thread+0xd8/0xe3
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff8024bfda>] ? autoremove_wake_function+0x0/0x2e
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff80249439>] ? worker_thread+0x0/0xe3
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff8024becc>] ? kthread+0x47/0x73
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff80234852>] ? schedule_tail+0x27/0x5f
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff8020cd19>] ? child_rip+0xa/0x11
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff80212496>] ? c1e_idle+0x0/0xe9
                 <Jan/07 01:02 am>[6801637.087360]  [<ffffffff8024be85>] ? kthread+0x0/0x73
<Jan/07 01:02 am>[6801637.087360]  [<ffffffff8020cd0f>] ? child_rip+0x0/0x11
<Jan/07 01:02 am>[6801637.087360] Code: e5 c9 c3 55 48 89 e5 41 57 4d 89 c7 41 56 49 89 fe 41 55 41 54 41 89 d4 53 48 83 ec 08 89 75 d4 89 4d d0 4c 8b 47 30 49 83 e8 18 <49> 8b 58 18 eb 29 45 8b 28 4c 89 f9 8b 55 d0 8b 75 d4 4c 89 c7 
<Jan/07 01:02 am>[6801637.087360] RIP  [<ffffffff8022dfe5>] __wake_up_common+0x28/0x74
<Jan/07 01:02 am>[6801637.087360]  RSP <ffff88012e0a7ce0>
<Jan/07 01:02 am>[6801637.087360] CR2: 0000000000000000

<Jan/07 01:02 am>[6801637.087360] ---[ end trace 314f22cf22e3d9ac ]---