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From: Fiona Ebner <f.ebner@proxmox.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>,
	Paolo Bonzini <pbonzini@redhat.com>,
	QEMU Developers <qemu-devel@nongnu.org>,
	Hanna Reitz <hreitz@redhat.com>, John Snow <jsnow@redhat.com>,
	"open list:Network Block Dev..." <qemu-block@nongnu.org>,
	Thomas Lamprecht <t.lamprecht@proxmox.com>
Subject: Re: deadlock when using iothread during backup_clean()
Date: Fri, 3 Nov 2023 14:20:50 +0100	[thread overview]
Message-ID: <7534e14e-df32-4772-99d2-335c486ddd72@proxmox.com> (raw)
In-Reply-To: <e13b488e-bf13-44f2-acca-e724d14f43fd@proxmox.com>

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



      reply	other threads:[~2023-11-03 13:22 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-05 10:01 deadlock when using iothread during backup_clean() Fiona Ebner
2023-09-05 11:25 ` Fiona Ebner
2023-10-04 16:51   ` Vladimir Sementsov-Ogievskiy
2023-09-05 11:42 ` Paolo Bonzini
2023-09-28  8:06   ` Fiona Ebner
2023-10-04 17:08     ` Vladimir Sementsov-Ogievskiy
2023-10-06 12:18       ` Fiona Ebner
2023-10-17 10:18         ` Fiona Ebner
2023-10-17 12:12           ` Kevin Wolf
2023-10-17 13:37             ` Fiona Ebner
2023-10-17 14:20               ` Kevin Wolf
2023-10-18  9:42                 ` Fiona Ebner
2023-10-19 12:14                   ` Kevin Wolf
2023-10-19 13:53                     ` Fiona Ebner
2023-10-20 13:52                       ` Fiona Ebner
2023-11-03 13:20                         ` Fiona Ebner [this message]

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