Xen users - Aug 2009 - Xend is crashing after few hours/days.

Hi, 

I have troubles with xend crashing : (xen 3.4.1 - Kernel 2.6.31-rc3). 
Xend is working perfectly for some hours, then crashes. No logs, except in the
dmesg :

How can check what''s wrong ? 

Regards, 

Here is the dmesg log : 

[68386.101572] INFO: task xend:19865 blocked for more than 120 seconds. 
[68386.101670] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[68386.101833] xend D ffff8804e9cbdec0 0 19865 19862 0x00000000 
[68386.101840] ffff8804e9cbdd48 0000000000000282 0000000000000000
ffffffff8103227e
[68386.101849] ffff8804e9cbdcd8 ffffffff00033f56 ffffffff8100f8ed
ffff8804ec618038
[68386.101857] 0000000000013c00 000000000000de88 ffff8804e89cc350
ffff8804ec49c350
[68386.101866] Call Trace: 
[68386.101876] [<ffffffff8103227e>] ? pvclock_clocksource_read+0x4e/0x90 
[68386.101882] [<ffffffff8100f8ed>] ? xen_force_evtchn_callback+0xd/0x10 
[68386.101887] [<ffffffff8103227e>] ? pvclock_clocksource_read+0x4e/0x90 
[68386.101894] [<ffffffff8143d45d>] schedule_timeout+0x18d/0x220 
[68386.101899] [<ffffffff810100b2>] ? check_events+0x12/0x20 
[68386.101903] [<ffffffff8100feb1>] ? xen_clocksource_read+0x21/0x30 
[68386.101908] [<ffffffff81010fa6>] ? xen_spin_lock+0xa6/0x110 
[68386.101913] [<ffffffff8101009f>] ? xen_restore_fl_direct_end+0x0/0x1 
[68386.101918] [<ffffffff8143c50c>] wait_for_common+0x15c/0x1a0 
[68386.101923] [<ffffffff8104d840>] ? default_wake_function+0x0/0x10 
[68386.101928] [<ffffffff8143c5e8>] wait_for_completion+0x18/0x20 
[68386.101933] [<ffffffff8106bbf3>] flush_work+0x73/0xc0 
[68386.101938] [<ffffffff8106bc40>] ? wq_barrier_func+0x0/0x10 
[68386.101944] [<ffffffff810c9f10>] ? lru_add_drain_per_cpu+0x0/0x10 
[68386.101948] [<ffffffff8106c583>] schedule_on_each_cpu+0xc3/0x100 
[68386.101953] [<ffffffff810c9590>] lru_add_drain_all+0x10/0x20 
[68386.101959] [<ffffffff810def75>] sys_mlock+0x45/0x110 
[68386.101964] [<ffffffff81014182>] system_call_fastpath+0x16/0x1b 
[68386.101967] INFO: task qemu-dm:23100 blocked for more than 120 seconds. 
[68386.102062] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[68386.102227] qemu-dm D ffff88011e03fec0 0 23100 23101 0x00000000 
[68386.102233] ffff88011e03fd48 0000000000000286 0000000000000000
ffffffff8103227e
[68386.102242] ffff88011e03fcd8 ffffffff0002e752 0000000000000017
ffff8804ec618038
[68386.102250] 0000000000013c00 000000000000de88 ffff8803dd049670
ffffffff81623020
[68386.102258] Call Trace: 
[68386.102263] [<ffffffff8103227e>] ? pvclock_clocksource_read+0x4e/0x90 
[68386.102268] [<ffffffff8103227e>] ? pvclock_clocksource_read+0x4e/0x90 
[68386.102273] [<ffffffff8143d45d>] schedule_timeout+0x18d/0x220 
[68386.102277] [<ffffffff810100b2>] ? check_events+0x12/0x20 
[68386.102282] [<ffffffff8100feb1>] ? xen_clocksource_read+0x21/0x30 
[68386.102286] [<ffffffff81010fa6>] ? xen_spin_lock+0xa6/0x110 
[68386.102291] [<ffffffff8101009f>] ? xen_restore_fl_direct_end+0x0/0x1 
[68386.102295] [<ffffffff8143c50c>] wait_for_common+0x15c/0x1a0 
[68386.102300] [<ffffffff8104d840>] ? default_wake_function+0x0/0x10 
[68386.102305] [<ffffffff8143c5e8>] wait_for_completion+0x18/0x20 
[68386.102309] [<ffffffff8106bbf3>] flush_work+0x73/0xc0 
[68386.102313] [<ffffffff8106bc40>] ? wq_barrier_func+0x0/0x10 
[68386.102318] [<ffffffff810c9f10>] ? lru_add_drain_per_cpu+0x0/0x10 
[68386.102323] [<ffffffff8106c583>] schedule_on_each_cpu+0xc3/0x100 
[68386.102327] [<ffffffff810c9590>] lru_add_drain_all+0x10/0x20 
[68386.102332] [<ffffffff810def75>] sys_mlock+0x45/0x110 
[68386.102336] [<ffffffff81014182>] system_call_fastpath+0x16/0x1b 
[68386.102340] INFO: task qemu-dm:23646 blocked for more than 120 seconds. 
[68386.102429] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[68386.102590] qemu-dm D ffff880395123ec0 0 23646 23650 0x00000000 
[68386.102597] ffff880395123d48 0000000000000282 0000000000000000
ffffffff8103227e
[68386.102605] ffff880395123cd8 ffffffff0002e752 0000000000000017
ffff8804ec618038
[68386.102613] 0000000000013c00 000000000000de88 ffff8805b51f8000
ffffffff81623020
[68386.102622] Call Trace: 
[68386.102627] [<ffffffff8103227e>] ? pvclock_clocksource_read+0x4e/0x90 
[68386.102632] [<ffffffff8103227e>] ? pvclock_clocksource_read+0x4e/0x90 
[68386.102637] [<ffffffff8143d45d>] schedule_timeout+0x18d/0x220 
[68386.102642] [<ffffffff810100b2>] ? check_events+0x12/0x20 
[68386.102646] [<ffffffff8100feb1>] ? xen_clocksource_read+0x21/0x30 
[68386.102650] [<ffffffff81010fa6>] ? xen_spin_lock+0xa6/0x110 
[68386.102655] [<ffffffff8101009f>] ? xen_restore_fl_direct_end+0x0/0x1 
[68386.102659] [<ffffffff8143c50c>] wait_for_common+0x15c/0x1a0 
[68386.102664] [<ffffffff8104d840>] ? default_wake_function+0x0/0x10 
[68386.102668] [<ffffffff8143c5e8>] wait_for_completion+0x18/0x20 
[68386.102672] [<ffffffff8106bbf3>] flush_work+0x73/0xc0 
[68386.102676] [<ffffffff8106bc40>] ? wq_barrier_func+0x0/0x10 
[68386.102681] [<ffffffff810c9f10>] ? lru_add_drain_per_cpu+0x0/0x10 
[68386.102685] [<ffffffff8106c583>] schedule_on_each_cpu+0xc3/0x100 
[68386.102690] [<ffffffff810c9590>] lru_add_drain_all+0x10/0x20 
[68386.102694] [<ffffffff810def75>] sys_mlock+0x45/0x110 
[68386.102698] [<ffffffff81014182>] system_call_fastpath+0x16/0x1b 


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