> db.foo.runCommand({find: "foox", tailable: true})
{
	"cursor" : {
		"id" : NumberLong(0),
		"ns" : "test.foox",
		"firstBatch" : [ ]
	},
	"ok" : 1
}
> db.foo.runCommand({find: "foox", tailable: true, batchSize: 0})
{
	"cursor" : {
		"id" : NumberLong(0),
		"ns" : "test.foox",
		"firstBatch" : [ ]
	},
	"ok" : 1
}

2017-08-28T17:32:41.095+0000 I COMMAND [conn227] command test.jstests_regexb appName: "MongoDB Shell" command: insert { insert: "jstests_regexb", ordered: true, $db: "test" } ninserted:1 keysInserted:2 numYields:0 reslen:29 locks:{ Global: { acquireCount: { r: 1, w: 1 } }, Database: { acquireCount: { w: 1 } }, Collection: { acquireCount: { w: 1 } } } protocol:op_msg 0ms
2017-08-28T17:32:41.175+0000 F - [conn227] Invariant failure _yieldPolicy->canReleaseLocksDuringExecution() src/mongo/db/query/plan_executor.cpp 429
2017-08-28T17:32:41.175+0000 F - [conn227] 
***aborting after invariant() failure
 
 
2017-08-28T17:32:41.196+0000 F - [conn227] Got signal: 6 (Aborted).
 
0x7fd1d7706841 0x7fd1d7705a59 0x7fd1d7705f3d 0x7fd1d4324850 0x7fd1d3fcb885 0x7fd1d3fcce61 0x7fd1d5ed2920 0x7fd1d656a111 0x7fd1d656add0 0x7fd1d656b75b 0x7fd1d6217ed5 0x7fd1d6218768 0x7fd1d700c368 0x7fd1d65977ad 0x7fd1d65bad57 0x7fd1d6f92ecd 0x7fd1d685a285 0x7fd1d685a47c 0x7fd1d685a973 0x7fd1d656ae1b 0x7fd1d656b75b 0x7fd1d61a7596 0x7fd1d61a926c 0x7fd1d71c8a16 0x7fd1d71c555f 0x7fd1d614ef64 0x7fd1d6150efc 0x7fd1d6151d9e 0x7fd1d615add0 0x7fd1d6157dd2 0x7fd1d6159f07 0x7fd1d61558d1 0x7fd1d75c8b54 0x7fd1d431c806 0x7fd1d407765d
----- BEGIN BACKTRACE -----
{"backtrace":[{"b":"7FD1D55E6000","o":"2120841","s":"_ZN5mongo15printStackTraceERSo"},{"b":"7FD1D55E6000","o":"211FA59"},{"b":"7FD1D55E6000","o":"211FF3D"},{"b":"7FD1D4315000","o":"F850"},{"b":"7FD1D3F99000","o":"32885","s":"gsignal"},{"b":"7FD1D3F99000","o":"33E61","s":"abort"},{"b":"7FD1D55E6000","o":"8EC920","s":"_ZN5mongo17invariantOKFailedEPKcRKNS_6StatusES1_j"},{"b":"7FD1D55E6000","o":"F84111","s":"_ZN5mongo12PlanExecutor20shouldWaitForInsertsEv"},{"b":"7FD1D55E6000","o":"F84DD0","s":"_ZN5mongo12PlanExecutor11getNextImplEPNS_11SnapshottedINS_7BSONObjEEEPNS_8RecordIdE"},{"b":"7FD1D55E6000","o":"F8575B","s":"_ZN5mongo12PlanExecutor7getNextEPNS_7BSONObjEPNS_8RecordIdE"},{"b":"7FD1D55E6000","o":"C31ED5","s":"_ZN5mongo20DocumentSourceCursor9loadBatchEv"},{"b":"7FD1D55E6000","o":"C32768","s":"_ZN5mongo20DocumentSourceCursor7getNextEv"},{"b":"7FD1D55E6000","o":"1A26368","s":"_ZN5mongo42DocumentSourceSingleDocumentTransformation7getNextEv"},{"b":"7FD1D55E6000","o":"FB17AD"},{"b":"7FD1D55E6000","o":"FD4D57","s":"_ZN5mongo35DocumentSourceLookupChangePostImage7getNextEv"},{"b":"7FD1D55E6000","o":"19ACECD","s":"_ZN5mongo8Pipeline7getNextEv"},{"b":"7FD1D55E6000","o":"1274285","s":"_ZN5mongo18PipelineProxyStage11getNextBsonEv"},{"b":"7FD1D55E6000","o":"127447C","s":"_ZN5mongo18PipelineProxyStage6doWorkEPm"},{"b":"7FD1D55E6000","o":"1274973","s":"_ZN5mongo9PlanStage4workEPm"},{"b":"7FD1D55E6000","o":"F84E1B","s":"_ZN5mongo12PlanExecutor11getNextImplEPNS_11SnapshottedINS_7BSONObjEEEPNS_8RecordIdE"},{"b":"7FD1D55E6000","o":"F8575B","s":"_ZN5mongo12PlanExecutor7getNextEPNS_7BSONObjEPNS_8RecordIdE"},{"b":"7FD1D55E6000","o":"BC1596"},{"b":"7FD1D55E6000","o":"BC326C"},{"b":"7FD1D55E6000","o":"1BE2A16","s":"_ZN5mongo12BasicCommand11enhancedRunEPNS_16OperationContextERKNS_12OpMsgRequestERNS_14BSONObjBuilderE"},{"b":"7FD1D55E6000","o":"1BDF55F","s":"_ZN5mongo7Command9publicRunEPNS_16OperationContextERKNS_12OpMsgRequestERNS_14BSONObjBuilderE"},{"b":"7FD1D55E6000","o":"B68F64"},{"b":"7FD1D55E6000","o":"B6AEFC"},{"b":"7FD1D55E6000","o":"B6BD9E","s":"_ZN5mongo23ServiceEntryPointMongod13handleRequestEPNS_16OperationContextERKNS_7MessageE"},{"b":"7FD1D55E6000","o":"B74DD0","s":"_ZN5mongo19ServiceStateMachine15_processMessageERNS0_11ThreadGuardE"},{"b":"7FD1D55E6000","o":"B71DD2","s":"_ZN5mongo19ServiceStateMachine15_runNextInGuardERNS0_11ThreadGuardE"},{"b":"7FD1D55E6000","o":"B73F07","s":"_ZN5mongo19ServiceStateMachine7runNextEv"},{"b":"7FD1D55E6000","o":"B6F8D1"},{"b":"7FD1D55E6000","o":"1FE2B54"},{"b":"7FD1D4315000","o":"7806"},{"b":"7FD1D3F99000","o":"DE65D","s":"clone"}],"processInfo":{ "mongodbVersion" : "3.5.12-81-g55a85da", "gitVersion" : "55a85da4980f1967f88bbccbd43646ee89c6301f", "compiledModules" : [], "uname" : { "sysname" : "Linux", "release" : "3.0.101-65-ec2", "version" : "#1 SMP Mon Sep 7 19:21:52 UTC 2015 (bef9feb)", "machine" : "x86_64" }, "somap" : [ { "b" : "7FD1D55E6000", "elfType" : 3, "buildId" : "16A7974105B78C63336290B07347B78E450FCFE6" }, { "b" : "7FFDB586A000", "elfType" : 3, "buildId" : "99C22E108F9AF52BB22FAAE27B62BEEE6AF1FFEF" }, { "b" : "7FD1D516E000", "path" : "/usr/lib64/libssl.so.0.9.8", "elfType" : 3, "buildId" : "F303AF2DC415D507812C74A220858FFB808043FF" }, { "b" : "7FD1D4DCF000", "path" : "/usr/lib64/libcrypto.so.0.9.8", "elfType" : 3, "buildId" : "CE8025EA3EB87B82EB5784D1599DF6BA9AFDAA89" }, { "b" : "7FD1D4BC6000", "path" : "/lib64/librt.so.1", "elfType" : 3, "buildId" : "56683208E69F23CE2B85AA69224347494B2D9B19" }, { "b" : "7FD1D49C2000", "path" : "/lib64/libdl.so.2", "elfType" : 3, "buildId" : "9A1CAA796142646BAB3852E16F39FE12F9570C73" }, { "b" : "7FD1D4749000", "path" : "/lib64/libm.so.6", "elfType" : 3, "buildId" : "C23AC6F6F615C8711D27A85E3D4DDDDE2DC32B56" }, { "b" : "7FD1D4532000", "path" : "/lib64/libgcc_s.so.1", "elfType" : 3, "buildId" : "EC0B843677D80C0216B976F17E8022790C578DCD" }, { "b" : "7FD1D4315000", "path" : "/lib64/libpthread.so.0", "elfType" : 3, "buildId" : "796CFD89EFAA4BB7EFD2A26590698F2ED0613E76" }, { "b" : "7FD1D3F99000", "path" : "/lib64/libc.so.6", "elfType" : 3, "buildId" : "D00CEF910068265D1DBF11F6116FE44EDA290FBC" }, { "b" : "7FD1D53C4000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3, "buildId" : "83058B5E06B2DBEB7ECAD4DBA132503F4E55E143" }, { "b" : "7FD1D3D83000", "path" : "/lib64/libz.so.1", "elfType" : 3, "buildId" : "C96D4398CB0A4F35E94CE172F9536CD5EBD20DD6" } ] }}
mongod(_ZN5mongo15printStackTraceERSo+0x41) [0x7fd1d7706841]
mongod(+0x211FA59) [0x7fd1d7705a59]
mongod(+0x211FF3D) [0x7fd1d7705f3d]
libpthread.so.0(+0xF850) [0x7fd1d4324850]
libc.so.6(gsignal+0x35) [0x7fd1d3fcb885]
libc.so.6(abort+0x181) [0x7fd1d3fcce61]
mongod(_ZN5mongo17invariantOKFailedEPKcRKNS_6StatusES1_j+0x0) [0x7fd1d5ed2920]
mongod(_ZN5mongo12PlanExecutor20shouldWaitForInsertsEv+0x111) [0x7fd1d656a111]
mongod(_ZN5mongo12PlanExecutor11getNextImplEPNS_11SnapshottedINS_7BSONObjEEEPNS_8RecordIdE+0x390) [0x7fd1d656add0]
mongod(_ZN5mongo12PlanExecutor7getNextEPNS_7BSONObjEPNS_8RecordIdE+0x4B) [0x7fd1d656b75b]
mongod(_ZN5mongo20DocumentSourceCursor9loadBatchEv+0xE5) [0x7fd1d6217ed5]
mongod(_ZN5mongo20DocumentSourceCursor7getNextEv+0x88) [0x7fd1d6218768]
mongod(_ZN5mongo42DocumentSourceSingleDocumentTransformation7getNextEv+0x38) [0x7fd1d700c368]
mongod(+0xFB17AD) [0x7fd1d65977ad]
mongod(_ZN5mongo35DocumentSourceLookupChangePostImage7getNextEv+0x47) [0x7fd1d65bad57]
mongod(_ZN5mongo8Pipeline7getNextEv+0x3D) [0x7fd1d6f92ecd]
mongod(_ZN5mongo18PipelineProxyStage11getNextBsonEv+0x35) [0x7fd1d685a285]
mongod(_ZN5mongo18PipelineProxyStage6doWorkEPm+0x11C) [0x7fd1d685a47c]
mongod(_ZN5mongo9PlanStage4workEPm+0x63) [0x7fd1d685a973]
mongod(_ZN5mongo12PlanExecutor11getNextImplEPNS_11SnapshottedINS_7BSONObjEEEPNS_8RecordIdE+0x3DB) [0x7fd1d656ae1b]
mongod(_ZN5mongo12PlanExecutor7getNextEPNS_7BSONObjEPNS_8RecordIdE+0x4B) [0x7fd1d656b75b]
mongod(+0xBC1596) [0x7fd1d61a7596]
mongod(+0xBC326C) [0x7fd1d61a926c]
mongod(_ZN5mongo12BasicCommand11enhancedRunEPNS_16OperationContextERKNS_12OpMsgRequestERNS_14BSONObjBuilderE+0x76) [0x7fd1d71c8a16]
mongod(_ZN5mongo7Command9publicRunEPNS_16OperationContextERKNS_12OpMsgRequestERNS_14BSONObjBuilderE+0x1F) [0x7fd1d71c555f]
mongod(+0xB68F64) [0x7fd1d614ef64]
mongod(+0xB6AEFC) [0x7fd1d6150efc]
mongod(_ZN5mongo23ServiceEntryPointMongod13handleRequestEPNS_16OperationContextERKNS_7MessageE+0x2FE) [0x7fd1d6151d9e]
mongod(_ZN5mongo19ServiceStateMachine15_processMessageERNS0_11ThreadGuardE+0xF0) [0x7fd1d615add0]
mongod(_ZN5mongo19ServiceStateMachine15_runNextInGuardERNS0_11ThreadGuardE+0x1B2) [0x7fd1d6157dd2]
mongod(_ZN5mongo19ServiceStateMachine7runNextEv+0x157) [0x7fd1d6159f07]
mongod(+0xB6F8D1) [0x7fd1d61558d1]
mongod(+0x1FE2B54) [0x7fd1d75c8b54]
libpthread.so.0(+0x7806) [0x7fd1d431c806]
libc.so.6(clone+0x6D) [0x7fd1d407765d]
-----  END BACKTRACE  -----
mongod on port 20000 was expected to be running in _do_teardown(), but wasn't. Exited with code -6.