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From: Juan Quintela <quintela@redhat.com>
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Date: Thu, 12 Nov 2015 15:22:17 +0100
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Subject: Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Amit Shah <amit.shah@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, QEMU Developers <qemu-devel@nongnu.org>

Peter Maydell <peter.maydell@linaro.org> wrote:
> On 12 November 2015 at 13:18, Peter Maydell <peter.maydell@linaro.org> wrote:
>> On 12 November 2015 at 13:08, Dr. David Alan Gilbert
>> <dgilbert@redhat.com> wrote:
>>> OK, can you try a simple migration by hand outside of the test harness;
>>> just something simple like:
>>>
>>> ./bin/qemu-system-x86_64 -M pc -nographic
>>> (qemu) migrate "exec: cat > /dev/null"
>>>
>>> and the same with q35 ?
>>
>> (qemu) migrate "exec: cat > /dev/null"
>> migrate_get_current do init of current_migration 65307
>> unqueue_page 65307
>> 0   qemu-system-x86_64                  0x00000001067c01c3 qemu_mutex_lock + 83
>
> This turns out to be because migrate_init() is corrupting the
> mutex memory when it does "memset(s, 0, sizeof(*s))". Presumably
> Linux's initialized-mutex is all-zeroes, but OSX's is not.

grrr, that is probably the case.  Thanks for pinponting this.


>
> thanks
> -- PMM