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envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.6.127; envelope-from=vsementsov@virtuozzo.com; helo=EUR04-DB3-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @virtuozzo.com) Content-Type: text/plain; charset="utf-8" req->receiving is a flag of request being in one concrete yield point in nbd_co_do_receive_one_chunk(). Such kind of boolean flag is always better to unset before scheduling the coroutine, to avoid double scheduling. So, let's be more careful. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Eric Blake --- block/nbd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/block/nbd.c b/block/nbd.c index 5cfb749e08..3cbee762de 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -150,6 +150,7 @@ static void nbd_recv_coroutines_wake_all(BDRVNBDState *= s) NBDClientRequest *req =3D &s->requests[i]; =20 if (req->coroutine && req->receiving) { + req->receiving =3D false; aio_co_wake(req->coroutine); } } @@ -548,6 +549,7 @@ static coroutine_fn void nbd_connection_entry(void *opa= que) * connection_co happens through a bottom half, which can only * run after we yield. */ + s->requests[i].receiving =3D false; aio_co_wake(s->requests[i].coroutine); qemu_coroutine_yield(); } @@ -934,7 +936,7 @@ static coroutine_fn int nbd_co_do_receive_one_chunk( /* Wait until we're woken up by nbd_connection_entry. */ s->requests[i].receiving =3D true; qemu_coroutine_yield(); - s->requests[i].receiving =3D false; + assert(!s->requests[i].receiving); if (!nbd_client_connected(s)) { error_setg(errp, "Connection closed"); return -EIO; --=20 2.29.2