Re: [Qemu-devel] qemu 2.0, deadlock in block-commit

["Marcin Gibuła" <m.gibula@beyond.pl>]

>> bdrv_requests_pending(), called by bdrv_requests_pending_all(), is the
>> function that determines for each of the disks in your VM if it still
>> has requests in flight that need to be completed. This function must
>> have returned true even though there is nothing to wait for.
>>
>> Can you check which of its conditions led to this behaviour, and for
>> which disk it did? Either by setting a breakpoint there and
>> singlestepping through the function the next time it is called (if the
>> poll even has a timeout), or by inspecting the conditions manually in
>> gdb.

The condition that is true is:

if (!QLIST_EMPTY(&bs->tracked_requests))

and it's returned for intermediate qcow2 which is being commited.

-- 
mg