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Date:   Thu, 30 Aug 2018 09:06:07 -0600
From:   Jens Axboe <>
To:     Mikulas Patocka <>
        Ming Lei <>, Josef Bacik <>
Subject: Re: writeback throttling deadlock

On 8/30/18 8:58 AM, Mikulas Patocka wrote:
> I report this deadlock in writeback throttling.
> The deadlock happened in guest virtual machine with Debian kernel 4.17.17 
> (4.17.0-3-amd64). The virtual machine had most of its memory swapped out, 
> when I tried to shut it down, I got this deadlock. There was no io in 
> flight.

Not very helpful for your case, but this should be fixed in Linus's
current tree. I've got a few pending fixes still, but they will be
going upstream for 4.19-rc2.

Jens Axboe

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