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Re: bdrv_drained_begin deadlock with io-threads


From: Dietmar Maurer
Subject: Re: bdrv_drained_begin deadlock with io-threads
Date: Thu, 2 Apr 2020 17:44:37 +0200 (CEST)

> It does looks more like your case because I now have bs.in_flight == 0
> and the BlockBackend of the scsi-hd device has in_flight == 8. 

yes, this looks very familiar.

> Of course, this still doesn't answer why it happens, and I'm not sure if we
> can tell without adding some debug code.
> 
> I'm testing on my current block branch with Stefan's fixes on top.

Note: I can trigger it with and without Stefans patches on top




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