From: "Marcin Gibuła" <m.gibula@beyond.pl>
To: Andrey Korolyov <andrey@xdel.ru>
Cc: Amit Shah <amit.shah@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Fam Zheng <famz@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration
Date: Thu, 17 Jul 2014 13:20:26 +0200 [thread overview]
Message-ID: <53C7B17A.8010108@beyond.pl> (raw)
In-Reply-To: <53C79C41.4000800@beyond.pl>
> I've reproduced your IO hang with 2.0 and both
> 9b1786829aefb83f37a8f3135e3ea91c56001b56 and
> a096b3a6732f846ec57dc28b47ee9435aa0609bf applied.
>
> Reverting 9b1786829aefb83f37a8f3135e3ea91c56001b56 indeed fixes the
> problem (but reintroduces block-migration hang). It's seems like qemu
> bug rather than guest problem, as no-kvmclock parameters makes no
> difference. IO just stops, all qemu IO threads die off. Almost like it
> forgets to migrate them:-)
Some more info:
a) 2.0 + 9b1786829aefb83f37a8f3135e3ea91c56001b56 +
a096b3a6732f846ec57dc28b47ee9435aa0609bf = hangs
b) 2.0 + 9b1786829aefb83f37a8f3135e3ea91c56001b56 = works
c) 2.0 + 9b1786829aefb83f37a8f3135e3ea91c56001b56 + move
cpu_synchronize_state to migration.c = works
Tested with NFS (qcow2) + cache=none.
IO is dead only for disk that was being written to during migration.
I.e. if my test VM has two disks: vda and vdb, and I'm running fio on
vdb and it hangs after migration, I can still issue writes to vda.
Recreation steps:
1. Create VM
2. Run fio (Andrey's config)
3. Live migrate VM couple of times.
--
mg
next prev parent reply other threads:[~2014-07-17 11:20 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-13 12:28 [Qemu-devel] latest rc: virtio-blk hangs forever after migration Andrey Korolyov
2014-07-13 15:29 ` Andrey Korolyov
2014-07-15 15:57 ` Paolo Bonzini
2014-07-15 17:32 ` Andrey Korolyov
2014-07-15 17:39 ` Andrey Korolyov
2014-07-15 5:03 ` Amit Shah
2014-07-15 6:52 ` Andrey Korolyov
2014-07-15 14:01 ` Andrey Korolyov
2014-07-15 21:09 ` Marcelo Tosatti
2014-07-15 21:25 ` Andrey Korolyov
2014-07-15 22:01 ` Paolo Bonzini
2014-07-15 23:40 ` Andrey Korolyov
2014-07-15 23:47 ` Marcelo Tosatti
2014-07-16 1:16 ` Marcelo Tosatti
2014-07-16 8:38 ` Andrey Korolyov
2014-07-16 11:52 ` Marcelo Tosatti
2014-07-16 13:24 ` Andrey Korolyov
2014-07-16 18:25 ` Andrey Korolyov
2014-07-16 21:28 ` Marcin Gibuła
2014-07-16 21:36 ` Andrey Korolyov
2014-07-17 9:49 ` Marcin Gibuła
2014-07-17 11:20 ` Marcin Gibuła [this message]
2014-07-17 11:54 ` Marcin Gibuła
2014-07-17 12:06 ` Andrey Korolyov
2014-07-17 13:25 ` Marcin Gibuła
2014-07-17 19:18 ` Dr. David Alan Gilbert
2014-07-17 20:33 ` Marcin Gibuła
2014-07-17 20:50 ` Andrey Korolyov
2014-07-18 8:21 ` Marcin Gibuła
2014-07-18 8:36 ` Andrey Korolyov
2014-07-18 8:44 ` Marcin Gibuła
2014-07-18 8:51 ` Paolo Bonzini
2014-07-18 8:48 ` Paolo Bonzini
2014-07-18 8:57 ` Amit Shah
2014-07-18 9:32 ` Marcin Gibuła
2014-07-18 9:37 ` Paolo Bonzini
2014-07-18 9:48 ` Marcin Gibuła
2014-07-29 16:58 ` Paolo Bonzini
2014-07-30 12:02 ` Marcin Gibuła
2014-07-30 13:38 ` Paolo Bonzini
2014-07-30 22:12 ` Marcin Gibuła
2014-07-31 11:27 ` Marcin Gibuła
2014-08-04 16:30 ` Marcin Gibuła
2014-08-04 18:30 ` Paolo Bonzini
2014-08-08 21:37 ` Marcelo Tosatti
2014-08-09 6:35 ` Paolo Bonzini
2014-08-21 15:48 ` Andrey Korolyov
2014-08-21 16:41 ` Andrey Korolyov
2014-08-21 16:44 ` Paolo Bonzini
2014-08-21 17:51 ` Andrey Korolyov
2014-08-22 16:44 ` Andrey Korolyov
2014-08-22 17:45 ` Marcelo Tosatti
2014-08-22 18:39 ` Andrey Korolyov
2014-08-22 19:05 ` Marcelo Tosatti
2014-08-22 19:05 ` Marcelo Tosatti
2014-08-22 19:51 ` Andrey Korolyov
2014-08-22 21:01 ` Marcelo Tosatti
2014-08-22 22:21 ` Andrey Korolyov
2014-08-24 16:19 ` Andrey Korolyov
2014-08-24 16:35 ` Paolo Bonzini
2014-08-24 16:57 ` Andrey Korolyov
2014-08-24 18:51 ` Andrey Korolyov
2014-08-24 20:14 ` Andrey Korolyov
2014-08-25 10:45 ` Paolo Bonzini
2014-08-25 10:51 ` Andrey Korolyov
2014-09-04 16:38 ` Marcelo Tosatti
2014-09-04 16:52 ` Andrey Korolyov
2014-09-04 18:54 ` Marcelo Tosatti
2014-09-04 18:54 ` Marcelo Tosatti
2014-09-04 19:13 ` Andrey Korolyov
2014-08-22 17:55 ` Paolo Bonzini
2014-10-09 19:07 ` Eduardo Habkost
2014-10-10 7:33 ` Marcin Gibuła
2014-10-11 12:58 ` Eduardo Habkost
2014-07-16 7:35 ` Marcin Gibuła
2014-07-16 12:00 ` Marcelo Tosatti
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