mongos will trip a non-fatal assertion failure and close the client connection when receiving an OP_KILL_CURSORS message if the server log level is 3 or higher. The assertion was introduced in SERVER-14268.
To reproduce:
var st = new ShardingTest({shards: 1}); var coll = st.getDB("test").foo; coll.getDB().adminCommand({setParameter: 1, logLevel: 3}); coll.insert({}); coll.insert({}); coll.insert({}); coll.insert({}); var cursor = coll.find().batchSize(2); cursor.next(); assert.eq(1, coll.getDB().serverStatus().metrics.cursor.open.total); cursor = null; gc(); assert.eq(0, coll.getDB().serverStatus().metrics.cursor.open.total);
The server generates the following output:
m30999| 2015-08-24T17:20:56.739-0400 I - [conn2] Assertion failure messageShouldHaveNs() src/mongo/db/dbmessage.cpp 94
m30999| 2015-08-24T17:20:56.742-0400 I CONTROL [conn2]
m30999| 0xa41c39 0x9f21b1 0x9d62ee 0x6e740d 0x5a96ca 0x9fe63b 0x7f27aeeae182 0x7f27adfaf30d
m30999| ----- BEGIN BACKTRACE -----
m30999| {"backtrace":[{"b":"400000","o":"641C39"},{"b":"400000","o":"5F21B1"},{"b":"400000","o":"5D62EE"},{"b":"400000","o":"2E740D"},{"b":"400000","o":"1A96CA"},{"b":"400000","o":"5FE63B"},{"b":"7F27AEEA6000","o":"8182"},{"b":"7F27ADEB4000","o":"FB30D"}],"processInfo":{ "mongodbVersion" : "3.0.6", "gitVersion" : "1ef45a23a4c5e3480ac919b28afcba3c615488f2", "uname" : { "sysname" : "Linux", "release" : "3.13.0-24-generic", "version" : "#46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000" }, { "b" : "7FFF932FE000", "elfType" : 3 }, { "b" : "7F27AEEA6000", "path" : "/lib/x86_64-linux-gnu/libpthread.so.0", "elfType" : 3 }, { "b" : "7F27AEC9E000", "path" : "/lib/x86_64-linux-gnu/librt.so.1", "elfType" : 3 }, { "b" : "7F27AEA9A000", "path" : "/lib/x86_64-linux-gnu/libdl.so.2", "elfType" : 3 }, { "b" : "7F27AE796000", "path" : "/usr/lib/x86_64-linux-gnu/libstdc++.so.6", "elfType" : 3 }, { "b" : "7F27AE490000", "path" : "/lib/x86_64-linux-gnu/libm.so.6", "elfType" : 3 }, { "b" : "7F27AE27A000", "path" : "/lib/x86_64-linux-gnu/libgcc_s.so.1", "elfType" : 3 }, { "b" : "7F27ADEB4000", "path" : "/lib/x86_64-linux-gnu/libc.so.6", "elfType" : 3 }, { "b" : "7F27AF0C4000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3 } ] }}
m30999| mongos(_ZN5mongo15printStackTraceERSo+0x29) [0xa41c39]
m30999| mongos(_ZN5mongo10logContextEPKc+0xE1) [0x9f21b1]
m30999| mongos(_ZN5mongo12verifyFailedEPKcS1_j+0xCE) [0x9d62ee]
m30999| mongos(+0x2E740D) [0x6e740d]
m30999| mongos(_ZN5mongo21ShardedMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0x13A) [0x5a96ca]
m30999| mongos(_ZN5mongo17PortMessageServer17handleIncomingMsgEPv+0x34B) [0x9fe63b]
m30999| libpthread.so.0(+0x8182) [0x7f27aeeae182]
m30999| libc.so.6(clone+0x6D) [0x7f27adfaf30d]
m30999| ----- END BACKTRACE -----
- duplicates
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SERVER-17886 dbKillCursors op asserts on mongos when at log level 3
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- Closed
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