Re: [Xen-devel] broken live migration in xen 4.3 (release)

[Vasiliy Tolstov <v.tolstov@xxxxxxxxx>]

2014-03-17 19:45 GMT+04:00 Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>:
> If you say
>    ssh ib-xen12 echo hi
> does it print anything except just "hi" ?
>

No. hi displayed and nothing more.

> If so then that is the problem.
>
>> My vague guess is that the unexpected data will say something like
>> "Segmentation Fault".
>
> That would go to stderr.
>
>> > libxl: error: libxl_utils.c:393:libxl_read_exactly: file/stream
>> > truncated reading GO message from migration stream
>> > migration target: Failure, destroying our copy.
>> > migration child [20864] not exiting, no longer waiting (exit status
>> > will be unreported)
>> > Migration failed, resuming at sender.
>> >
>> > Guest domain kernel panics (timekeeping errors).
>> > What can i check? Live migration to localhost also fails.
>
> That the abortive migration breaks the guest is probably a bug in the
> guest.


No, this error i'm already see in 4.0.1 (exactly) and it not
reproduced in xm toolstack.
And this domU kernels works fine on 4.1.2.
Guest panics via:
[ 1621.056898] kernel BUG at drivers/xen/events.c:1281!
[ 1621.056898] invalid opcode: 0000 [#1] SMP
[ 1621.056898] last sysfs file: /sys/devices/virtual/vc/vcsa4/uevent
[ 1621.056898] CPU 0
[ 1621.056898] Modules linked in:
[ 1621.056898] Pid: 2601, comm: kstop/0 Not tainted 2.6.32.26 #1
[ 1621.056898] RIP: e030:[<ffffffff812ea748>]  [<ffffffff812ea748>]
xen_irq_resume+0xc8/0x284
[ 1621.056898] RSP: e02b:ffff88001e38fde0  EFLAGS: 00010082
[ 1621.056898] RAX: ffffffffffffffef RBX: 000000000000022f RCX: 0000000000000001
[ 1621.056898] RDX: 0000000000000000 RSI: ffff88001e38fdf0 RDI: 0000000000000001
[ 1621.056898] RBP: ffff88001e38fe30 R08: 0000000000000040 R09: ffffffff81595ab8
[ 1621.056898] R10: 0000000000000000 R11: ffff88001e38fdf0 R12: ffff88001fde9e6c
[ 1621.056898] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 1621.056898] FS:  00007f81c364c700(0000) GS:ffff880003ce6000(0000)
knlGS:0000000000000000
[ 1621.056898] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1621.056898] CR2: 00007f3ded29efa0 CR3: 000000001cfb3000 CR4: 0000000000002660
[ 1621.056898] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1621.056898] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1621.056898] Process kstop/0 (pid: 2601, threadinfo
ffff88001e38e000, task ffff88001f74a170)
[ 1621.056898] Stack:
[ 1621.056898]  ffffffff812e89a3 0000000000000000 0000000000000000
ffffffff8100e89f
[ 1621.056898] <0> ffffffff813e3931 0000000000000000 ffff88001fde9e6c
ffff880003d00a80
[ 1621.056898] <0> ffffffff810790bb 0000000000000000 ffff88001e38fe50
ffffffff812eb62d
[ 1621.056898] Call Trace:
[ 1621.056898]  [<ffffffff812e89a3>] ? __max_nr_grant_frames+0x21/0x38
[ 1621.056898]  [<ffffffff8100e89f>] ? xen_restore_fl_direct_end+0x0/0x1
[ 1621.056898]  [<ffffffff813e3931>] ? _spin_unlock_irqrestore+0x19/0x1c
[ 1621.056898]  [<ffffffff810790bb>] ? stop_cpu+0x0/0xcd
[ 1621.056898]  [<ffffffff812eb62d>] xen_suspend+0xb8/0xce
[ 1621.056898]  [<ffffffff81079142>] stop_cpu+0x87/0xcd
[ 1621.056898]  [<ffffffff8105425b>] worker_thread+0x120/0x1c6
[ 1621.056898]  [<ffffffff81056eff>] ? autoremove_wake_function+0x0/0x38
[ 1621.056898]  [<ffffffff8105413b>] ? worker_thread+0x0/0x1c6
[ 1621.056898]  [<ffffffff81056b35>] kthread+0x69/0x71
[ 1621.056898]  [<ffffffff8101228a>] child_rip+0xa/0x20
[ 1621.056898]  [<ffffffff81011461>] ? int_ret_from_sys_call+0x7/0x1b
[ 1621.056898]  [<ffffffff81011c1d>] ? retint_restore_args+0x5/0x6
[ 1621.056898]  [<ffffffff81012280>] ? child_rip+0x0/0x20
[ 1621.056898] Code: e8 73 f0 ff ff 41 89 c6 44 39 f8 74 04 0f 0b eb
fe 44 89 7d c0 44 89 6d c4 48 8d 75 c0 bf 01 00 00 00 e8 f2 f0 ff ff
85 c0 74 04 <0f> 0b eb fe 44 8b
65 c8 44 89 f6 41 0f b7 fc 49 63 c4 48 c1 e0


-- 
Vasiliy Tolstov,
e-mail: v.tolstov@xxxxxxxxx
jabber: vase@xxxxxxxxx

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