Re: kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!

[Keir Fraser <keir.fraser@eu.citrix.com>]

I suggest you stick with the xen-3.4.0 tag in linux-2.6.18-xen.hg and see if
that serves you better. This particular bug may have been introduced by the
blktap2 additions (at least the BUG() is in a file which that patch
introduces). Cc'ed the blktap2 guys.

 -- Keir

On 16/07/2009 17:19, "Christopher S. Aker" <caker@theshore.net> wrote:

> Xen 3.3-testing @ changeset 18651, 64bit
> dom0 2.6.18.8 @ changeset 888, PAE
> 
> Files: http://theshore.net/~caker/xen/BUGS/1.22/
> 
> clearing empty pagemap 311
> ------------[ cut here ]------------
> kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!
> invalid opcode: 0000 [#1]
> SMP
> Modules linked in: e1000e e1000
> CPU:    0
> EIP:    0061:[<c0390507>]    Not tainted VLI
> EFLAGS: 00010292   (2.6.18.8-888-1 #1)
> EIP is at blkback_pagemap_clear+0x57/0xa0
> eax: 0000001e   ebx: 00000137   ecx: 00000000   edx: fdb4e000
> esi: d24f4ea0   edi: c0691a14   ebp: d24f4e94   esp: cdc0fbd4
> ds: 007b   es: 007b   ss: 0069
> Process blkback.166.xvd (pid: 30401, ti=cdc0e000 task=cb028570
> task.ti=cdc0e000)
> Stack: c05441a0 00000137 00000003 d23463f0 00000002 0000023e c038e00d
> cdc0fbf8
>         00000135 d2b65000 00000000 00000000 00000000 00000010 00000000
> d2b66000
>         00000000 00000000 00000000 0000037b 00003b18 00005617 00000000
> 00000000
> Call Trace:
>   [<c038e00d>] fast_flush_area+0xad/0x130
>   [<c0439774>] dm_request+0xc4/0xf0
>   [<c02eda83>] generic_make_request+0x173/0x210
>   [<c03841ca>] evtchn_do_upcall+0x10a/0x200
>   [<c02edb89>] submit_bio+0x69/0x120
>   [<c0174217>] bio_add_page+0x37/0x50
>   [<c038e58d>] dispatch_rw_block_io+0x1fd/0x730
>   [<c04fcd4c>] schedule+0x33c/0xa00
>   [<c02ea84a>] elv_next_request+0x12a/0x220
>   [<c02ef133>] __generic_unplug_device+0x33/0x40
>   [<c02ef5e5>] generic_unplug_device+0x15/0x50
>   [<c043a07a>] dm_table_unplug_all+0x2a/0x40
>   [<c038eb73>] blkif_schedule+0xb3/0x620
>   [<c04fcd4c>] schedule+0x33c/0xa00
>   [<c038eac0>] blkif_schedule+0x0/0x620
>   [<c0136b62>] kthread+0xc2/0x100
>   [<c0136aa0>] kthread+0x0/0x100
>   [<c0102c45>] kernel_thread_helper+0x5/0x10
> Code: 1a 69 c0 7d 4d 8d 04 5b bf 08 1a 69 c0 8d 2c 82 b9 0c 00 00 00 89
> ee f3 a6 75 18 89 5c 24 04 c7 04 24 a0 41 54 c0 e8 f9 13 d9 ff <0f> 0b
> 41 00 50 65 55 c0 b9 03 00 00 00 89 ef 31 c0 f3 ab 8b 5c
> EIP: [<c0390507>] blkback_pagemap_clear+0x57/0xa0 SS:ESP 0069:cdc0fbd4
> 
> -Chris
> 
> 
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