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Tue, 30 Dec 2025 20:05:45 -0800 (PST) Received: from celestia ([69.9.135.12]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34e92228b64sm31319667a91.10.2025.12.30.20.05.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Dec 2025 20:05:44 -0800 (PST) From: Sam Edwards X-Google-Original-From: Sam Edwards To: Xiubo Li , Ilya Dryomov Cc: ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org, Sam Edwards , stable@vger.kernel.org Subject: [PATCH] libceph: Reset sparse-read on fault Date: Tue, 30 Dec 2025 20:05:06 -0800 Message-ID: <20251231040506.7859-1-CFSworks@gmail.com> X-Mailer: git-send-email 2.51.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When a fault occurs, the connection is abandoned, reestablished, and any pending operations are retried. The OSD client tracks the progress of a sparse-read reply using a separate state machine, largely independent of the messenger's state. If a connection is lost mid-payload or the sparse-read state machine returns an error, the sparse-read state is not reset. The OSD client will then interpret the beginning of a new reply as the continuation of the old one. If this makes the sparse-read machinery enter a failure state, it may never recover, producing loops like: libceph: [0] got 0 extents libceph: data len 142248331 !=3D extent len 0 libceph: osd0 (1)...:6801 socket error on read libceph: data len 142248331 !=3D extent len 0 libceph: osd0 (1)...:6801 socket error on read Therefore, reset the sparse-read state in osd_fault(), ensuring retries start from a clean state. Cc: stable@vger.kernel.org Signed-off-by: Sam Edwards --- net/ceph/osd_client.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 3667319b949d..1a7be2f615dc 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -4281,6 +4281,9 @@ static void osd_fault(struct ceph_connection *con) goto out_unlock; } =20 + osd->o_sparse_op_idx =3D -1; + ceph_init_sparse_read(&osd->o_sparse_read); + if (!reopen_osd(osd)) kick_osd_requests(osd); maybe_request_map(osdc); --=20 2.51.2