[Xen-bugs] [Bug 520] New: Killing xenstored crashes dom0

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=520

           Summary: Killing xenstored crashes dom0
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: pl@xxxxxxxxxx
                CC: hohnbaum@xxxxxxxxxx


I'm hitting this mainly at shutdown of dom0.  It was previously pointed out on
the mailing list but there doesn't appear to be a bug opened for it.

Current changeset is 8777:581d4a0ac729
x86-32, default config.

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: intel_agp agpgart
CPU:    0
EIP:    0061:[<c014cc39>]    Not tainted VLI
EFLAGS: 00010286   (2.6.16-rc2-xen0)
EIP is at page_remove_rmap+0x99/0xb0
eax: ffffffff   ebx: c100bda0   ecx: ffffffff   edx: fbfa8000
esi: c17e9a14   edi: c0cf6dd4   ebp: c1e59d8c   esp: c1e59d80
ds: 007b   es: 007b   ss: 0069
Process xenstored (pid: 3672, threadinfo=c1e58000 task=c1e29070)
Stack: <0>c0454d31 00000000 c100bda0 c1e59df4 c014678b c100bda0 b7f74000 
01ded067
       00357ee2 00000001 b7f74000 00000000 00000001 b7f75000 c0cf4b7c c0cf4b7c
       c0cf4b7c ffffffff 00000000 c100bda0 c059b3b0 c6c08740 01ded067 b7f74fff
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
 [<c014678b>] unmap_vmas+0x29b/0x610
 [<c0149bf0>] exit_mmap+0x70/0xf0
 [<c0119537>] mmput+0x27/0x80
 [<c011c76a>] exit_mm+0x6a/0xe0
 [<c011d3c8>] do_exit+0xe8/0x820
 [<c011db34>] do_group_exit+0x34/0x90
 [<c012770d>] get_signal_to_deliver+0x27d/0x510
 [<c01074b4>] do_notify_resume+0x94/0x6ec
 [<c0107cab>] work_notifysig+0x13/0x18
Code: c7 04 24 1a 4d 45 c0 40 89 44 24 04 e8 51 f2 fc ff 8b 43 10 c7 04 24 31 4d
45 c0 89 44 24 04 e8 3e f2 fc ff eb 87 8b 53 0c eb d2 <0f> 0b 2b 02 f8 4c 45 c0
e9 7b ff ff ff 8d 76 00 8d bc 27 00 00
 <1>Fixing recursive fault but reboot is needed!
md: stopping all md devices.
md: md0 switched to read-only mode.

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