From d8b4bad846f08ff0f167b46dc156a5310b750484 Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Fri, 2 Nov 2018 18:11:52 +0300 Subject: block/nbd-client: use traces instead of noisy error_report_err Reduce extra noise of nbd-client, change 083 correspondingly. In various commits (be41c100 in 2.10, f140e300 in 2.11, 78a33ab in 2.12), we added spots where qemu as an NBD client would report problems communicating with the server to stderr, because there was no where else to send the error to. However, this is racy, particularly since the most common source of these errors is when either the client or the server abruptly hangs up, leaving one coroutine to report the error only if it wins (or loses) the race in attempting the read from the server before another thread completes its cleanup of a protocol error that caused the disconnect in the first place. The race is also apparent in the fact that differences in the flush behavior of the server can alter the frequency of encountering the race in the client (see commit 6d39db96). Rather than polluting stderr, it's better to just trace these situations, for use by developers debugging a flaky connection, particularly since the real error that either triggers the abrupt disconnection in the first place, or that results from the EIO when a request can't receive a reply, DOES make it back to the user in the normal Error propagation channels. Signed-off-by: Vladimir Sementsov-Ogievskiy Message-Id: <20181102151152.288399-4-vsementsov@virtuozzo.com> [eblake: drop depedence on error hint, enhance commit message] Signed-off-by: Eric Blake --- tests/qemu-iotests/083.out | 28 ---------------------------- 1 file changed, 28 deletions(-) (limited to 'tests/qemu-iotests/083.out') diff --git a/tests/qemu-iotests/083.out b/tests/qemu-iotests/083.out index f9af8bb691..7419722cd7 100644 --- a/tests/qemu-iotests/083.out +++ b/tests/qemu-iotests/083.out @@ -41,8 +41,6 @@ can't open device nbd+tcp://127.0.0.1:PORT/foo === Check disconnect after neg2 === -Unable to read from socket: Connection reset by peer -Connection closed read failed: Input/output error === Check disconnect 8 neg2 === @@ -55,40 +53,30 @@ can't open device nbd+tcp://127.0.0.1:PORT/foo === Check disconnect before request === -Unable to read from socket: Connection reset by peer -Connection closed read failed: Input/output error === Check disconnect after request === -Connection closed read failed: Input/output error === Check disconnect before reply === -Connection closed read failed: Input/output error === Check disconnect after reply === -Unexpected end-of-file before all bytes were read read failed: Input/output error === Check disconnect 4 reply === -Unexpected end-of-file before all bytes were read -Connection closed read failed: Input/output error === Check disconnect 8 reply === -Unexpected end-of-file before all bytes were read -Connection closed read failed: Input/output error === Check disconnect before data === -Unexpected end-of-file before all bytes were read read failed: Input/output error === Check disconnect after data === @@ -118,8 +106,6 @@ can't open device nbd+tcp://127.0.0.1:PORT/ === Check disconnect after neg-classic === -Unable to read from socket: Connection reset by peer -Connection closed read failed: Input/output error === Check disconnect before neg1 === @@ -164,8 +150,6 @@ can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock === Check disconnect after neg2 === -Unable to read from socket: Connection reset by peer -Connection closed read failed: Input/output error === Check disconnect 8 neg2 === @@ -178,40 +162,30 @@ can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock === Check disconnect before request === -Unable to read from socket: Connection reset by peer -Connection closed read failed: Input/output error === Check disconnect after request === -Connection closed read failed: Input/output error === Check disconnect before reply === -Connection closed read failed: Input/output error === Check disconnect after reply === -Unexpected end-of-file before all bytes were read read failed: Input/output error === Check disconnect 4 reply === -Unexpected end-of-file before all bytes were read -Connection closed read failed: Input/output error === Check disconnect 8 reply === -Unexpected end-of-file before all bytes were read -Connection closed read failed: Input/output error === Check disconnect before data === -Unexpected end-of-file before all bytes were read read failed: Input/output error === Check disconnect after data === @@ -241,8 +215,6 @@ can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock === Check disconnect after neg-classic === -Unable to read from socket: Connection reset by peer -Connection closed read failed: Input/output error *** done -- cgit v1.2.3