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List:       kvm
Subject:    Re: [PATCH kvmtool] virtio: Fix ordering of virt_queue__should_signal()
From:       Milan Kocian <milon () wq ! cz>
Date:       2020-07-31 22:05:47
Message-ID: 20200731220547.GD7810 () msc ! wq ! cz
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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
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