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

From: Laurent Vivier
Subject: Re: [Qemu-devel] [Bug 1681688] Re: qemu live migration failed
Date: Tue, 11 Apr 2017 16:00:06 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

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?


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


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