linux-ext4 - Re: [ext4 io hang] buffered write io hang in balance_dirty

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Date:   Thu, 27 Apr 2023 04:58:36 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-block@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Dave Chinner <dchinner@...hat.com>,
        Eric Sandeen <sandeen@...hat.com>,
        Christoph Hellwig <hch@....de>, Zhang Yi <yi.zhang@...hat.com>
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.