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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?
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