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Re: [Qemu-block] How to solve the deadlock issue when makes an external

From: Eric Blake
Subject: Re: [Qemu-block] How to solve the deadlock issue when makes an external snapshot with the same iothread
Date: Mon, 22 May 2017 12:32:34 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0

On 05/22/2017 04:10 AM, Xieyingtai wrote:
> Hi,
>     Recently, I got a problem when vm with multiple disks made an
> external snapshot using dataplane with the same iothread. Aio context
> was acquired in external_snapshot_prepare(), which will be released in
> external_snapshot_clean() with all bs snapshots committed together. In
> this scene, when the same iothread was configured with multiple disks,
> the second bs will hang in aio_poll() waiting IO returned, as the
> iothread could not acquired the aio context.

Does this series clean up your issue?

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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