Re: [Xen-devel] unable to handle kernel paging request at virtual address

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

Here's another report from a user who crashed, then was trying to umount 
a partition...
# umount /home
sb orphan head is 176344
sb_info orphan list:
BUG: unable to handle kernel paging request at virtual address 017902bd
printing eip:
c0315435
10723000 -> *pde = 00000002:2cca1027
0336b000 -> *pme = 00000000:00000000
Oops: 0000 [#1]
SMP
Modules linked in:
CPU: 0
EIP: 0061:[<c0315435>] Not tainted VLI
EFLAGS: 00010097 (2.6.18.8-domU-linode7 #1)
EIP is at vsnprintf+0x437/0x615
eax: 017902bd ebx: ffffffff ecx: 017902bd edx: fffffffe
esi: c05d118b edi: c05d1580 ebp: c04d325c esp: d5969e04
ds: 007b es: 007b ss: 0069
Process umount (pid: 2314, ti=d5968000 task=c1d54570 task.ti=d5968000)
Stack: 00000fff c1306180 c052e3a0 c0349c51 00002270 00000015 00000400 
c05d1180
00002285 00000000 ffffffff ffffffff d5969ee4 c04d325c 00000400 d594612c
00000000 d5dc8e00 c0315627 d5969ee0 c3611e5c c011c30f d5969ee0 c04847ef
Call Trace:
[<c0349c51>] kcons_write+0x0/0xc9
[<c0315627>] vscnprintf+0x14/0x21
[<c011c30f>] vprintk+0x6e/0x3c1
[<c04847ef>] __wait_on_bit+0x54/0x5e
[<c015fc64>] sync_buffer+0x0/0x34
[<c012ea2d>] wake_bit_function+0x0/0x3c
[<c011c67d>] printk+0x1b/0x1f
[<c01d6fab>] ext3_put_super+0x12b/0x1f6
[<c0163e86>] generic_shutdown_super+0x82/0x121
[<c0163f42>] kill_block_super+0x1d/0x2d
[<c01640f0>] deactivate_super+0x53/0x66
[<c0178421>] sys_umount+0x3e/0x21e
[<c01103ea>] do_page_fault+0x10f/0xc70
[<c014e7cb>] unmap_region+0x101/0x117
[<c0166f1c>] sys_stat64+0xf/0x33
[<c014dc98>] remove_vma+0x31/0x36
[<c014ee2e>] do_munmap+0x177/0x1cd
[<c0178618>] sys_oldumount+0x17/0x1b
[<c0105137>] syscall_call+0x7/0xb
Code: 42 fc ff ff 8b 44 24 4c 83 c0 04 89 44 24 30 8b 54 24 4c 8b 0a 81 
f9 ff 0f
00 00 b8 d5 f6 4d c0 0f 46 c8 8b 54 24 2c 89 c8 eb 06 <80> 38 00 74 07 
40 4a 83 fa ff 75 f4 29 c8 89 c3 8b 6c 24 28 f6
EIP: [<c0315435>] vsnprintf+0x437/0x615 SS:ESP 0069:d5969e04
BUG: warning at kernel/exit.c:854/do_exit()
[<c011e4cd>] do_exit+0x8c6/0x8cb
[<c011c67d>] printk+0x1b/0x1f
[<c0310069>] cfq_dispatch_requests+0x4e4/0x5a0
[<c0105f2e>] die+0x2c6/0x2d7
[<c0110a62>] do_page_fault+0x787/0xc70
[<c0124cc9>] run_timer_softirq+0x3a/0x1d3
[<c034a409>] handle_input+0x91/0xd8
[<c03163f1>] memmove+0x24/0x2a
[<c01102db>] do_page_fault+0x0/0xc70
[<c01052e3>] error_code+0x2b/0x30
[<c0315435>] vsnprintf+0x437/0x615
[<c0349c51>] kcons_write+0x0/0xc9
[<c0315627>] vscnprintf+0x14/0x21
[<c011c30f>] vprintk+0x6e/0x3c1
[<c04847ef>] __wait_on_bit+0x54/0x5e
[<c015fc64>] sync_buffer+0x0/0x34
[<c012ea2d>] wake_bit_function+0x0/0x3c
[<c011c67d>] printk+0x1b/0x1f
[<c01d6fab>] ext3_put_super+0x12b/0x1f6
[<c0163e86>] generic_shutdown_super+0x82/0x121
[<c0163f42>] kill_block_super+0x1d/0x2d
[<c01640f0>] deactivate_super+0x53/0x66
[<c0178421>] sys_umount+0x3e/0x21e
[<c01103ea>] do_page_fault+0x10f/0xc70
[<c014e7cb>] unmap_region+0x101/0x117
[<c0166f1c>] sys_stat64+0xf/0x33
[<c014dc98>] remove_vma+0x31/0x36
[<c014ee2e>] do_munmap+0x177/0x1cd
[<c0178618>] sys_oldumount+0x17/0x1b
[<c0105137>] syscall_call+0x7/0xb

-Chris

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