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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <2025543.PYKUYFuaPT@weasel> References: <2025543.PYKUYFuaPT@weasel> <20251227180137.730385-1-pierre@barre.sh> To: Christian Schoenebeck Cc: dhowells@redhat.com, ericvh@kernel.org, lucho@ionkov.net, asmadeus@codewreck.org, Pierre Barre , v9fs@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] 9p: fix i_size update race in getattr with writeback caching Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1406914.1771340720.1@warthog.procyon.org.uk> Content-Transfer-Encoding: quoted-printable Date: Tue, 17 Feb 2026 15:05:20 +0000 Message-ID: <1406915.1771340720@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Christian Schoenebeck wrote: > For cache=3Dloose I couldn't reproduce, but with cache=3Dmmap I could re= produce > data corruption, folio writeback hangup and the following error message: > = > [ 60.847671] [append] R=3D134d: No submit Can you get me some tracing? If you can turn on: echo 65536 >/sys/kernel/tracing/buffer_size_kb echo 1 > /sys/kernel/tracing/events/netfs/netfs_read/enable echo 1 > /sys/kernel/tracing/events/netfs/netfs_write/enable echo 1 > /sys/kernel/tracing/events/netfs/netfs_rreq/enable echo 1 > /sys/kernel/tracing/events/netfs/netfs_sreq/enable echo 1 > /sys/kernel/tracing/events/netfs/netfs_failure/enable run the test to generate the issue, then get the trace: cat /sys/kernel/tracing/trace | bzip2 -9 >trace.txt and grab whatever it said in dmesg, particularly if it mentions R=3D. Thanks, David