Re: [Qemu-stable] [Qemu-devel] [PATCH] throttle-groups: update tg->any_timer_armed[] on detach

[Eric Blake]

On 09/19/2017 10:50 AM, Stefan Hajnoczi wrote:
> Clear tg->any_timer_armed[] when throttling timers are destroy during

s/destroy/destroyed/

> AioContext attach/detach.  Failure to do so causes throttling to hang
> because we believe the timer is already scheduled!
> 
> The following was broken at least since QEMU 2.10.0 with -drive
> iops=100:
> 
>   $ dd if=/dev/zero of=/dev/vdb oflag=direct count=1000
>   (qemu) stop
>   (qemu) cont
>   ...I/O is stuck...
> 
> Reported-by: Yongxue Hong <address@hidden>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
>  block/throttle-groups.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
Reviewed-by: Eric Blake <address@hidden>

CC: address@hidden

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

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