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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1prsmC-0038hU-Ar; Thu, 27 Apr 2023 03:58:36 +0000 Date: Thu, 27 Apr 2023 04:58:36 +0100 From: Matthew Wilcox To: Ming Lei Cc: Theodore Ts'o , linux-ext4@vger.kernel.org, Andreas Dilger , linux-block@vger.kernel.org, Andrew Morton , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Dave Chinner , Eric Sandeen , Christoph Hellwig , Zhang Yi Subject: Re: [ext4 io hang] buffered write io hang in balance_dirty_pages Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: z96ifuesebawkjjebsbae15rqsdp4wkf X-Rspam-User: X-Rspamd-Queue-Id: 07B0D1C0011 X-Rspamd-Server: rspam06 X-HE-Tag: 1682567929-283488 X-HE-Meta: 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 Tk4lxu8W EJ59gQaYBj4zI3ToprSaW1i6cN3aWEzad7is+NYPRemFEVGL/SuwLVEELQP3Sl4qlRWUUeXqxqcto9mDNg3aC0sAiHGpqNQo0GRNMdj2Nb0zERyN392ngttZR6j4DxY3HbGnTwHk0WDOkPORq1ek/oQJOrEJrwg5deIjDFgqKYuHSv1d5XYhlGC4Z7g== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.