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Date: Thu, 18 Jun 2015 08:59:21 +0200
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Subject: Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?
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To: Peter Lieven <pl@kamp.de>, Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>, qemu block <qemu-block@nongnu.org>



On 18/06/2015 08:39, Peter Lieven wrote:
> 
> It seems like the mainloop is waiting here:
> 
> #0  0x00007ffff606c89c in __lll_lock_wait ()
>    from /lib/x86_64-linux-gnu/libpthread.so.0
> No symbol table info available.
> #1  0x00007ffff6068065 in _L_lock_858 ()
>    from /lib/x86_64-linux-gnu/libpthread.so.0
> No symbol table info available.
> #2  0x00007ffff6067eba in pthread_mutex_lock ()
>    from /lib/x86_64-linux-gnu/libpthread.so.0
> No symbol table info available.
> #3  0x00005555559f2557 in qemu_mutex_lock (mutex=0x555555ed6d40)
>     at util/qemu-thread-posix.c:76
>         err = 0
>         __func__ = "qemu_mutex_lock"
> #4  0x00005555556306ef in qemu_mutex_lock_iothread ()
>     at /usr/src/qemu-2.2.0/cpus.c:1123
> No locals.

This means the VCPU is busy with some synchronous activity---maybe a
bdrv_aio_cancel?

Paolo