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From: Milan Kocian <milon@wq.cz>
To: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: kvm@vger.kernel.org, julien.thierry.kdev@gmail.com,
	will@kernel.org, jean-philippe@linaro.org,
	andre.przywara@arm.com, Anvay Virkar <anvay.virkar@arm.com>
Subject: Re: [PATCH kvmtool] virtio: Fix ordering of virt_queue__should_signal()
Date: Sat, 1 Aug 2020 00:05:47 +0200
Message-ID: <20200731220547.GD7810@msc.wq.cz> (raw)
In-Reply-To: <20200731101427.16284-1-alexandru.elisei@arm.com>

Hello,
 
> I *think* this also fixes the VM hang reported in [1], where several
> processes in the guest were stuck in uninterruptible sleep. I am not
> familiar with the block layer, but my theory is that the threads were stuck
> in wait_for_completion_io(), from blk_execute_rq() executing a flush
> request. It would be great if Milan could give this patch a spin and see if
> the problem goes away. Don't know how reproducible it is though.
> 
> [1] https://www.spinics.net/lists/kvm/msg204543.html
> 

Okay, I will test it but it takes some time. Because I migrated to the
qemu due this problem :-) so I need to prepare new environment. And
because the problem happens randomly. My environment can run days/few weeks
without this problem.

Thanks.

Best regards.

-- 
Milan Kocian

  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31 10:14 Alexandru Elisei
2020-07-31 13:30 ` Jean-Philippe Brucker
2020-08-04 11:13   ` Alexandru Elisei
2020-07-31 22:05 ` Milan Kocian [this message]
2020-08-04 12:15   ` Alexandru Elisei

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