Re: [Xen-devel] kernel BUG at mm/swapfile.c:2524

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Apr 06, 2011 at 05:59:03PM -0400, Peter Sandin wrote:
> Hello,
> 
> We've got some 2.6.38 domUs that are hitting a bug in mm/swapfile.c. The 
> issue has only cropped up since we have moved to 2.6.38. This issue has 
> happened on multiple separate physical machines. I've attached the trace from 
> one instance here, additional instances can be found along with a copy of the 
> domU kernel image and configuration at:
> 
> http://thesandins.net/xen/2.6.38/

What exactly happend to cause this?
> 
> ------------[ cut here ]------------
> kernel BUG at mm/swapfile.c:2524!
> invalid opcode: 0000 [#1] SMP
> last sysfs file: /sys/devices/vbd-51728/block/xvdb/stat
> Modules linked in:
> 
> Pid: 539, comm: apache2 Not tainted 2.6.38-linode31 #1
> EIP: 0061:[<c01a36b6>] EFLAGS: 00010246 CPU: 0
> EIP is at swap_count_continued+0x176/0x180
> EAX: f57ba5f8 EBX: ed3c8f00 ECX: f57ba000 EDX: 00000000
> ESI: ed3c5320 EDI: 00000080 EBP: 000005f8 ESP: eb80be80
>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0069
> Process apache2 (pid: 539, ti=eb80a000 task=cc472be0 task.ti=eb80a000)
> Stack:
>  ec8e68c0 000195f8 00000040 00000000 c01a37b1 000195f8 ec96ae20 ed14b000
>  00000000 c01a3a18 00000000 c01955cc 00000000 80000007 00000000 c0106314
>  00000023 ecf7ac4c 000195f8 ca6e0290 00000000 ffffffe8 b883d664 00000000
> Call Trace:
>  [<c01a37b1>] ? swap_entry_free+0xf1/0x120
>  [<c01a3a18>] ? swap_free+0x18/0x30
>  [<c01955cc>] ? handle_pte_fault+0x49c/0xac0
>  [<c0106314>] ? check_events+0x8/0xc
>  [<c0196e91>] ? handle_mm_fault+0x101/0x1a0
>  [<c011e81b>] ? do_page_fault+0xfb/0x3e0
>  [<c063f390>] ? _raw_spin_lock_irq+0x10/0x20
>  [<c063fcd6>] ? error_code+0x5a/0x60
>  [<c013f397>] ? sys_rt_sigaction+0x77/0xa0
>  [<c011e720>] ? do_page_fault+0x0/0x3e0
>  [<c063fcd6>] ? error_code+0x5a/0x60
>  [<c0630000>] ? sctp_sockaddr_af+0x20/0x90
>  [<c011e720>] ? do_page_fault+0x0/0x3e0
> Code: ff 89 d8 e8 cd f7 f7 ff 01 e8 8d 76 00 c6 00 00 ba 01 00 00 00 eb b2 89 
> f8 3c 80 0f 94 c0 e9 b
> 9 fe ff ff 0f 0b eb fe 0f 0b eb fe <0f> 0b eb fe 0f 0b eb fe 66 90 83 ec 10 
> 89 1c 24 89 c3 89 74 24
> EIP: [<c01a36b6>] swap_count_continued+0x176/0x180 SS:ESP 0069:eb80be80
> ---[ end trace 41e4a2572fe1ada6 ]---
> 
> I've looked at the section of code that is generating the the fault, but I'm 
> a bit over my head. Does this look like it is a Xen specific issue, or 
> something that would be better addressed on the LKML? Any insight you can 
> provide on the source or a fix for this issue would be appreciated.
> 
> Thanks,
> Peter
> _______________________________________________
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
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