[Xen-devel] Debian Lenny 2.6.26-2-xen-686 crashing as multi-vcpu domU, stack trace

[Pasi Kärkkäinen <pasik@xxxxxx>]

Hello,

I have a PV domU running Debian Lenny 2.6.26-2-xen-686. It has 2 vcpus, 2GB of 
memory,
and it crashes every 14-30 days..

Basicly the guest get stuck somehow, and starts to consume all the CPU time it 
can get.
"xm console <guest>" doesn't allow me to do anything (I can't login, but I can 
see the 
messages on the console - no errors there), and it doesn't respond from the 
network either.

It's not totally crashed either, it's just stuck in some loop. 
no errors or anything special in "xm log". 

Any ideas?

I tried running xenctx on it a couple of times from dom0:

eip: c0105c0f jiffies_to_st+0x17
esp: dd747dcc
eax: 91dc1272   ebx: 2e88c443   ecx: 03020006   edx: 91dc1272
esi: 91dc1272   edi: dd747dec   ebp: c0378184
 cs: 00000061    ds: 0000007b    fs: 000000d8    gs: 00000033

Stack:
 00000003 00000103 dd747dec c023d164 00000000 00000001 00000000 00000000
 00000006 c123872c 00000022 c023f968 00002221 c0378184 00002221 00000000
 00000100 c02cbedf ed4026c0 00000000 c0106444 0000007b c011007b 000000d8
 fffffef0 c0101227 00000061 00000246 c023cdd9 00000fd0 c1234020 00000000

Code:
89 c6 53 8b 1d 80 81 37 c0 0f ae e8 66 90 f6 c3 01 74 04 f3 90 <eb> ec a1 40 81 
37 c0 89 f1 29 c1

Call Trace:
  [<c0105c0f>] jiffies_to_st+0x17 <--
  [<c023d164>] xen_poll_irq+0x41
  [<c023f968>] xen_spin_wait+0xcc
  [<c02cbedf>] _spin_lock+0x31
  [<c0106444>] timer_interrupt+0x37
  [<c011007b>] __change_page_attr_set_clr+0x4cd
  [<c0101227>] hypercall_page+0x227
  [<c023cdd9>] force_evtchn_callback+0xa
  [<c0122648>] current_fs_time+0x13
  [<c0184c61>] mnt_drop_write+0x1b
  [<c01502e7>] generic_file_aio_read+0x49a
  [<c0149901>] handle_IRQ_event+0x36
  [<c014aa15>] handle_level_irq+0x90
  [<c0105b00>] do_IRQ+0x4d
  [<c023d8c7>] evtchn_do_upcall+0xfa
  [<c010412c>] hypervisor_callback+0x3c
  [<c013326b>] current_kernel_time+0xb
  [<c012263d>] current_fs_time+0x8
  [<c0223b1f>] tty_write+0x191
  [<c0225b5e>] n_tty_open+0x88
  [<c022398e>] send_break+0x5e
  [<c017060c>] vfs_write+0x83
  [<c0170bde>] sys_write+0x3c
  [<c0103f76>] syscall_call+0x7


running it again:

eip: c0105c06 jiffies_to_st+0xe
esp: dd747dcc
eax: 91dc1272   ebx: 2e88c443   ecx: 03020006   edx: 91dc1272
esi: 91dc1272   edi: dd747dec   ebp: c0378184
 cs: 00000061    ds: 0000007b    fs: 000000d8    gs: 00000033

Stack:
 00000003 00000103 dd747dec c023d164 00000000 00000001 00000000 00000000
 00000006 c123872c 00000022 c023f968 00002221 c0378184 00002221 00000000
 00000100 c02cbedf ed4026c0 00000000 c0106444 0000007b c011007b 000000d8
 fffffef0 c0101227 00000061 00000246 c023cdd9 00000fd0 c1234020 00000000

Code:
f1 89 43 14 5b c3 c3 57 56 89 c6 53 8b 1d 80 81 37 c0 0f ae e8 <66> 90 f6 c3 01 
74 04 f3 90 eb ec

Call Trace:
  [<c0105c06>] jiffies_to_st+0xe <--
  [<c023d164>] xen_poll_irq+0x41
  [<c023f968>] xen_spin_wait+0xcc
  [<c02cbedf>] _spin_lock+0x31
  [<c0106444>] timer_interrupt+0x37
  [<c011007b>] __change_page_attr_set_clr+0x4cd
  [<c0101227>] hypercall_page+0x227
  [<c023cdd9>] force_evtchn_callback+0xa
  [<c0122648>] current_fs_time+0x13
  [<c0184c61>] mnt_drop_write+0x1b
  [<c01502e7>] generic_file_aio_read+0x49a
  [<c0149901>] handle_IRQ_event+0x36
  [<c014aa15>] handle_level_irq+0x90
  [<c0105b00>] do_IRQ+0x4d
  [<c023d8c7>] evtchn_do_upcall+0xfa
  [<c010412c>] hypervisor_callback+0x3c
  [<c013326b>] current_kernel_time+0xb
  [<c012263d>] current_fs_time+0x8
  [<c0223b1f>] tty_write+0x191
  [<c0225b5e>] n_tty_open+0x88
  [<c022398e>] send_break+0x5e
  [<c017060c>] vfs_write+0x83
  [<c0170bde>] sys_write+0x3c
  [<c0103f76>] syscall_call+0x7


-- Pasi


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