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

[Peter Lieven <pl@dlhnet.de>]

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.?
i was also able to reproduce a "flush_blks: Assertion 
`block_mig_state.read_done >= 0' failed." by
cancelling a block migration and restarting it afterwards.
however, how can I grep a stack trace after an assert?

thanks,
peter

> Kevin