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

[Peter Lieven <pl@dlhnet.de>]

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