[Xen-devel] kernel BUG at mm/rmap.c:555!

[Leendert van Doorn <leendert@xxxxxxxxxxxxxx>]

I noticed that when you kill xenstored in xen-unstable.hg 8758, it will
take down all of domain 0. Killing xenstored is probably not the smartest
thing to do, but it shouldn't take down dom0.

        Leendert

Eeek! page_mapcount(page) went negative! (-1)
  page->flags = 414
  page->count = 1
  page->mapping = 00000000
------------[ cut here ]------------
kernel BUG at mm/rmap.c:555!
invalid opcode: 0000 [#1]
Modules linked in: video thermal processor fan button battery ac
CPU:    0
EIP:    0061:[<c014ccc9>]    Not tainted VLI
EFLAGS: 00010286   (2.6.16-rc2-xen0) 
EIP is at page_remove_rmap+0x99/0xb0
eax: ffffffff   ebx: c1011bc0   ecx: 00000000   edx: fbfa8000
esi: f3ef6804   edi: f3b5bcec   ebp: f3475d8c   esp: f3475d80
ds: 007b   es: 007b   ss: 0069
Process xenstored (pid: 3015, threadinfo=f3474000 task=f3756a70)
Stack: <0>c0452c25 00000000 c1011bc0 f3475df4 c014682b c1011bc0 b7f3a000 038de06
7 
       00362ec9 00000001 b7f3a000 00000000 00000001 b7f3b000 ffffffff 00000000 
       c1011bc0 c059b3b0 c0e3dac0 038de067 b7f3afff c0de3b7c b7f3b000 00000000 
Call Trace:
 [<c010837d>] show_stack_log_lvl+0xcd/0x120
 [<c0108530>] show_registers+0x160/0x200
 [<c0108815>] die+0xe5/0x240
 [<c0108b98>] do_trap+0x98/0xe0
 [<c0108eb1>] do_invalid_op+0xa1/0xb0
 [<c0107d87>] error_code+0x2b/0x30
 [<c014682b>] unmap_vmas+0x29b/0x610
 [<c0149c80>] exit_mmap+0x70/0xf0
 [<c0119537>] mmput+0x27/0x80
 [<c011c77a>] exit_mm+0x6a/0xe0
 [<c011d3d8>] do_exit+0xe8/0x830
 [<c011db54>] do_group_exit+0x34/0x90
 [<c012772d>] get_signal_to_deliver+0x27d/0x510
 [<c01074b4>] do_notify_resume+0x94/0x6ec
 [<c0107cab>] work_notifysig+0x13/0x18
Code: c7 04 24 0e 2c 45 c0 40 89 44 24 04 e8 d1 f1 fc ff 8b 43 10 c7 04 24 25 2c
 45 c0 89 44 24 04 e8 be f1 fc ff eb 87 8b 53 0c eb d2 <0f> 0b 2b 02 ec 2b 45 c0
 e9 7b ff ff ff 8d 76 00 8d bc 27 00 00 
 <0>Fatal exception: panic in 5 seconds
Kernel panic - not syncing: Fatal exception
 (XEN) Domain 0 shutdown: rebooting machine.


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