Re: [Xen-devel] 2.6.32.27 dom0 - BUG: unable to handle kernel paging request

["Christopher S. Aker" <caker@xxxxxxxxxxxx>]

On Dec 31, 2010, at 12:19 PM, Christopher S. Aker wrote:
> We kicked off this identical run on 10 hosts.  On another host I cranked 
> these numbers up to total about 80 domUs.  They're all still running fine.

Scratch that - another box just hit the identical trace:

BUG: unable to handle kernel paging request at 15555d60
IP: [<c1022781>] vmalloc_sync_all+0xd1/0x1f0
*pdpt = 000000000c0ea027 *pde = 0000000000000000
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/system/xen_memory/xen_memory0/info/current_kb
Modules linked in: dm_snapshot iTCO_wdt usbhid
Pid: 44, comm: xenwatch Not tainted (2.6.32.27-1 #1) X8DTU
EIP: 0061:[<c1022781>] EFLAGS: 00010007 CPU: 2
EIP is at vmalloc_sync_all+0xd1/0x1f0
EAX: 15555d60 EBX: c1aa8f00 ECX: 55555001 EDX: 06855067
ESI: c173ad60 EDI: ddbd7944 EBP: 00000009 ESP: dfd7fe64
DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
Process xenwatch (pid: 44, ti=dfd7e000 task=dfce90f0 task.ti=dfd7e000)
Stack:
00000018 0001fc55 00000000 c0000d60 f5800000 1fc55067 00000000 1fc55067
<0> 00000000 c170025c cc974c20 d422a180 dfd7ff20 c8d44118 c10829d0 c1081370
<0> 00000000 00000000 c12bbbd6 c1006bf4 00000025 dfd7fee4 cc970220 00000009
Call Trace:
[<c10829d0>] ? alloc_vm_area+0x40/0x60
[<c1081370>] ? f+0x0/0x10
[<c12bbbd6>] ? blkif_map+0x36/0x1c0
[<c1006bf4>] ? check_events+0x8/0xc
[<c12b2b0f>] ? xenbus_gather+0x5f/0x90
[<c12bb36c>] ? frontend_changed+0x25c/0x2d0
[<c12b36c5>] ? xenbus_otherend_changed+0x95/0xa0
[<c12b38bf>] ? frontend_changed+0xf/0x20
[<c12b1f57>] ? xenwatch_thread+0x87/0x130
[<c1048700>] ? autoremove_wake_function+0x0/0x40
[<c12b1ed0>] ? xenwatch_thread+0x0/0x130
[<c10484e4>] ? kthread+0x74/0x80
[<c1048470>] ? kthread+0x0/0x80
[<c1009e67>] ? kernel_thread_helper+0x7/0x10
Code: 04 8b 45 00 ff 15 14 2e 65 c1 8b 54 24 0c 25 00 f0 ff ff 8d 34 10 8b 16 
8b 6e 04 f6 c2 01 74 7d 89 c8 25 00 f0 ff ff 03 44 24 0c <8b> 08 89 4c 24 04 8b 
48 04 f6 44 24 04 01 75 67 89 e9 e8 18 32
EIP: [<c1022781>] vmalloc_sync_all+0xd1/0x1f0 SS:ESP 0069:dfd7fe64
CR2: 0000000015555d60
---[ end trace 48bbd5284e47e665 ]---

Thoughts or suggestions?  I'd be happy to provide any additional information or 
perform more tests.

Thanks!
-Chris


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