Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration

[Andrey Korolyov]

On Tue, Jul 15, 2014 at 7:57 PM, Paolo Bonzini <address@hidden> wrote:
> Il 13/07/2014 17:29, Andrey Korolyov ha scritto:
>
>> Small follow-up: issue have probabilistic nature, as it looks - by
>> limited number of runs, it is reproducible within three cases:
>>  1) live migration went well, I/O locked up,
>>  2) live migration failed by timeout, I/O locked up,
>>  3) live migration went well and disk was not locked, but on backward
>> migration we are always hitting 2).
>
>
> Can you provide a gdb backtrace of case (2)?
>
> Paolo
>

Sorry, I`ve mixed reset into. The timeout on migration happens if
there was already hang before reset. Bt-reset and bt-noreset
corresponds to two backtraces first of which had hang+reset
previously. As it looks by bisection, the problem introduced by fix
targeted to patch exactly the same behavior. Moreover, rolling
problematic commit back (9a833121eb253589143ff8fe30be8a311a2c16b3)
fixes situation for me.

bt-noreset.txt
Description: Text document

bt-reset.txt
Description: Text document