Re: [Qemu-devel] Block Migration Assertion in qemu-kvm 1.2.0

[Peter Lieven]

On 09/17/12 22:12, Peter Lieven wrote:
> On 09/17/12 10:41, Kevin Wolf wrote:
> > Am 16.09.2012 12:13, schrieb Peter Lieven:
> > > Hi,
> > >
> > > when trying to block migrate a VM from one node to another, the source
> > > VM crashed with the following assertion:
> > > block.c:3829: bdrv_set_in_use: Assertion `bs->in_use != in_use' failed.
> > >
> > > Is this sth already addresses/known?
> > Not that I'm aware of, at least.
> >
> > Block migration doesn't seem to check whether the device is already in
> > use, maybe this is the problem. Not sure why it would be in use, though,
> > and in my quick test it didn't crash.
> >
> > So we need some more information: What's you command line, did you do
> > anything specific in the monitor with block devices, what does the
> > stacktrace look like, etc.?
> kevin, it seems that i can very easily force a crash if I cancel a 
> running block migration.
if I understand correctly what happens there are aio callbacks coming in 
after
blk_mig_cleanup() has been called.

what is the proper way to detect this in blk_mig_read_cb()?

Thanks,
Peter