Re: deadlock when using iothread during backup_clean()

[Fiona Ebner]

Am 20.10.23 um 15:52 schrieb Fiona Ebner:
> And I found that with drive-mirror, the issue during starting seems to
> manifest with the bdrv_open() call. Adding a return before it, the guest
> IO didn't get stuck in my testing, but adding a return after it, it can
> get stuck. I'll try to see if I can further narrow it down next week,
> but maybe that's already a useful hint?
> 

In the end, I was able to find a reproducer that just does draining and
bisected the issue (doesn't seem related to the graph lock after all). I
replied there, to avoid all the overhead from this thread:

https://lists.nongnu.org/archive/html/qemu-devel/2023-11/msg00681.html

Best Regards,
Fiona