Comment 0 for bug 681083

Binary package hint: linux-image-2.6.32-25-generic

When using one processor trying to migrate the Ubuntu Guest from Hosts it dumps:

[518258.206396] INFO: task xenwatch:12 blocked for more than 120 seconds.
[518258.206405] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[518258.206412] xenwatch D ffff88000294cbc0 0 12 2 0x00000000
[518258.206417] ffff88007dfe5bf0 0000000000000246 0000000000015bc0 0000000000015bc0
[518258.206423] ffff88007dfd9ab0 ffff88007dfe5fd8 0000000000015bc0 ffff88007dfd96f0
[518258.206428] 0000000000015bc0 ffff88007dfe5fd8 0000000000015bc0 ffff88007dfd9ab0
[518258.206434] Call Trace:
[518258.206443] [<ffffffff8155a0be>] ? _spin_unlock_irqrestore+0x1e/0x30
[518258.206448] [<ffffffff8155841d>] schedule_timeout+0x22d/0x300
[518258.206454] [<ffffffff8100f302>] ? check_events+0x12/0x20
[518258.206459] [<ffffffff8106085f>] ? __enqueue_rt_entity+0x11f/0x220
[518258.206463] [<ffffffff8105a616>] ? update_curr+0xe6/0x1e0
[518258.206466] [<ffffffff815576c6>] wait_for_common+0xd6/0x180
[518258.206470] [<ffffffff8105a350>] ? default_wake_function+0x0/0x20
[518258.206474] [<ffffffff8155782d>] wait_for_completion+0x1d/0x20
[518258.206478] [<ffffffff81083f1b>] kthread_stop+0x4b/0xd0
[518258.206482] [<ffffffff8108724f>] ? hrtimer_force_reprogram+0x7f/0x90
[518258.206487] [<ffffffff8107fbbe>] cleanup_workqueue_thread+0x3e/0x80
[518258.206490] [<ffffffff8107fda3>] destroy_workqueue+0x93/0xe0
[518258.206495] [<ffffffff810b5764>] stop_machine_destroy+0x34/0x50
[518258.206499] [<ffffffff8131ff7f>] do_suspend+0xaf/0x120
[518258.206502] [<ffffffff813200f9>] shutdown_handler+0x109/0x160
[518258.206505] [<ffffffff81321472>] xenwatch_thread+0xc2/0x190
[518258.206509] [<ffffffff81084240>] ? autoremove_wake_function+0x0/0x40
[518258.206512] [<ffffffff813213b0>] ? xenwatch_thread+0x0/0x190
[518258.206515] [<ffffffff81083ec6>] kthread+0x96/0xa0
[518258.206519] [<ffffffff810131ea>] child_rip+0xa/0x20
[518258.206523] [<ffffffff810123d1>] ? int_ret_from_sys_call+0x7/0x1b
[518258.206526] [<ffffffff81012b5d>] ? retint_restore_args+0x5/0x6
[518258.206530] [<ffffffff810131e0>] ? child_rip+0x0/0x20

Using more processors, the VM just freezes (can't access from console or network) or lose Disk IO and Network connection.

I've tried the kernel http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.33.5-lucid/linux-image-2.6.33-02063305-generic_2.6.33-02063305_amd64.deb and the problem doesn't happen in this kernel.

I'm using XenServer 5.6 Build 31188p

I'm trying to use some old kernels and backporting some patches from the 2.6.33 but I'm not successful.

I'm gonna still try to fix it, but any help will be appreciated.

Best regards,