Re: bdrv_drained_begin deadlock with io-threads

[Dietmar Maurer]

> Can you reproduce the problem with my script, but pointing it to your
> Debian image and running stress-ng instead of dd? 

yes

> If so, how long does
> it take to reproduce for you?

I sometimes need up to 130 iterations ...

Worse, I thought several times the bug is gone, but then it triggered again 
(sigh).

But most times below 30 iteration (if you run "stress-ng -d 5").

Also note that it can happen at different places, but always inside a drained 
section ...