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Date:   Thu, 27 Apr 2023 04:58:36 +0100
From:   Matthew Wilcox <>
To:     Ming Lei <>
Cc:     Theodore Ts'o <>,,
        Andreas Dilger <>,,
        Andrew Morton <>,,,
        Dave Chinner <>,
        Eric Sandeen <>,
        Christoph Hellwig <>, Zhang Yi <>
Subject: Re: [ext4 io hang] buffered write io hang in balance_dirty_pages

On Thu, Apr 27, 2023 at 10:20:28AM +0800, Ming Lei wrote:
> Hello Guys,
> I got one report in which buffered write IO hangs in balance_dirty_pages,
> after one nvme block device is unplugged physically, then umount can't
> succeed.

That's a feature, not a bug ... the dd should continue indefinitely?

balance_dirty_pages() is sleeping in KILLABLE state, so kill -9 of
the dd process should succeed.

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