BUG at mm/vmscan.c:904 [mmotm 2009-07-02-19-57]

[Jiri Slaby]

Hi,

I don't know what exactly lead to this, but I got it when installing a
kernel rpm (io load) in qemu:

------------[ cut here ]------------
kernel BUG at mm/vmscan.c:904!
invalid opcode: 0000 [#1] PREEMPT SMP
last sysfs file: /sys/devices/pci0000:00/0000:00:05.0/modalias
CPU 0
Modules linked in: e1000
Pid: 290, comm: kswapd0 Tainted: G       AW  2.6.31-rc1-mm1 #103
RIP: 0010:[<ffffffff81095c96>]  [<ffffffff81095c96>]
isolate_pages_global+0x196/0x260
RSP: 0018:ffff880011943c40  EFLAGS: 00010082
RAX: 00000000ffffffea RBX: ffffea0000050170 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffea0000050170
RBP: ffff880011943cd0 R08: 0000000000000001 R09: ffffffff81668b00
R10: 00000000ffffffff R11: 0000000000000001 R12: ffffffff81669060
R13: ffffea0000050198 R14: ffff880011943d50 R15: ffffffff81668b00
FS:  0000000000000000(0000) GS:ffff88000176f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00007f5d32981000 CR3: 0000000011adb000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process kswapd0 (pid: 290, threadinfo ffff880011942000, task
ffff88001254c840)
Stack:
 ffff880011943d68 0000000000000020 0000000000000030 000000020177f4b0
<0> 0000000000000003 000000008103329b 0000000000000001 ffffffffffffffff
<0> 0000000100000003 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff81096ae6>] shrink_active_list+0xa6/0x330
 [<ffffffff81032fe8>] ? task_rq_lock+0x48/0x90
 [<ffffffff810985c0>] ? kswapd+0x0/0x770
 [<ffffffff81098ab5>] kswapd+0x4f5/0x770
 [<ffffffff81037177>] ? pick_next_task_fair+0xd7/0xf0
 [<ffffffff810985c0>] ? kswapd+0x0/0x770
 [<ffffffff81095b00>] ? isolate_pages_global+0x0/0x260
 [<ffffffff8103f1ed>] ? default_wake_function+0xd/0x10
 [<ffffffff8105aa30>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff813f9978>] ? preempt_schedule+0x38/0x60
 [<ffffffff813fbb40>] ? _spin_unlock_irqrestore+0x30/0x40
 [<ffffffff810985c0>] ? kswapd+0x0/0x770
 [<ffffffff8105a6b6>] kthread+0x96/0xa0
 [<ffffffff8100ceaa>] child_rip+0xa/0x20
 [<ffffffff8105a620>] ? kthread+0x0/0xa0
 [<ffffffff8100cea0>] ? child_rip+0x0/0x20
Code: 80 75 12 8b 55 bc 8b 75 b4 4c 89 ef e8 f4 f9 ff ff 85 c0 74 79 49
ff c7 49 83 c5 38 4c 39 7d 98 77 cf 48 ff 45 c8 e9 e9 fe ff ff <0f> 0b
eb fe 48 8b 53 30 48 8b 4b 28 48 8d 43 28 48 89 51 08 48
RIP  [<ffffffff81095c96>] isolate_pages_global+0x196/0x260
 RSP <ffff880011943c40>
---[ end trace fc1de39f3465335f ]---
note: kswapd0[290] exited with preempt_count 1
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