Re: [Qemu-devel] [Bug 1681688] Re: qemu live migration failed

[Laurent Vivier]

On 11/04/2017 15:57, Kevin Wolf wrote:
> Am 11.04.2017 um 15:35 hat 858585 jemmy geschrieben:
>> Hi Kevin:
>>    Can you provide some information about the original bug which you want 
>> fix?
>>
>>    the original comment:
>>    Usually guest devices don't like other writers to the same image, so
>>    they use blk_set_perm() to prevent this from happening.
>>
>>    i don't find where the dest qemu will use blk_set_perm during migration.
>>    but after apply this patch, blkconf_apply_backend_options don't update the
>>    blk->root->perm.
> 
> Do I understand correctly that this is not simply live migration, but
> block live migration (with 'migrate -b')?
> 
> Can you please post a backtrace not of the successful case, but of the
> failing assertion?

Kevin,

I've also reproduced this problem without the block live migration while
I was testing my patch to fix the virtio-rng migration.

Laurent