> db.runCommand({buildinfo: 1})
{
	"version" : "2.7.9-pre-",
	"gitVersion" : "364b03260ef5e06a58568c57a1e44fd2fcd7cb8e",
	"OpenSSLVersion" : "",
	"sysInfo" : "Linux acebox 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 BOOST_LIB_VERSION=1_49",
	"loaderFlags" : "-fPIC -pthread -Wl,-z,now -rdynamic",
	"compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -std=c++11 -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -pipe -Werror -O3 -Wno-unused-local-typedefs -Wno-unused-function -Wno-deprecated-declarations -Wno-unused-but-set-variable -fno-builtin-memcmp -std=c99",
	"allocator" : "tcmalloc",
	"versionArray" : [
		2,
		7,
		9,
		-100
	],
	"javascriptEngine" : "V8",
	"bits" : 64,
	"debug" : false,
	"maxBsonObjectSize" : 16777216,
	"ok" : 1
}
> 

 mongod(mongo::printStackTrace(std::basic_ostream<char, std::char_traits<char> >&)+0x23) [0xfad813]
 mongod(+0xBAD3C2) [0xfad3c2]
 mongod(+0xBAD746) [0xfad746]
 libc.so.6(+0x324F0) [0x7f717c2e84f0]
 libc.so.6(gsignal+0x35) [0x7f717c2e8475]
 libc.so.6(abort+0x180) [0x7f717c2eb6f0]
 mongod(mongo::invariantFailed(char const*, char const*, unsigned int)+0xCA) [0xf47cca]
 mongod(mongo::mr::MapReduceCommand::run(mongo::OperationContext*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, mongo::BSONObj&, int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, mongo::BSONObjBuilder&, bool)+0x16E2) [0xa471a2]
 mongod(mongo::_execCommand(mongo::OperationContext*, mongo::Command*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, mongo::BSONObj&, int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, mongo::BSONObjBuilder&, bool)+0x42) [0xa8f7e2]
 mongod(mongo::Command::execCommand(mongo::OperationContext*, mongo::Command*, int, char const*, mongo::BSONObj&, mongo::BSONObjBuilder&, bool)+0x8EB) [0xa902cb]
 mongod(mongo::_runCommands(mongo::OperationContext*, char const*, mongo::BSONObj&, mongo::_BufBuilder<mongo::TrivialAllocator>&, mongo::BSONObjBuilder&, bool, int)+0x487) [0xa90c17]
 mongod(mongo::newRunQuery(mongo::OperationContext*, mongo::Message&, mongo::QueryMessage&, mongo::CurOp&, mongo::Message&, bool)+0x7EF) [0xc5c86f]
 mongod(mongo::assembleResponse(mongo::OperationContext*, mongo::Message&, mongo::DbResponse&, mongo::HostAndPort const&, bool)+0xC26) [0xb63f26]
 mongod(mongo::MyMessageHandler::process(mongo::Message&, mongo::AbstractMessagingPort*, mongo::LastError*)+0xA3) [0x8e7a93]
 mongod(mongo::PortMessageServer::handleIncomingMsg(void*)+0x48B) [0xf743cb]
 libpthread.so.0(+0x6B50) [0x7f717d1f2b50]
 libc.so.6(clone+0x6D) [0x7f717c3920ed]
-----  END BACKTRACE  -----

2014-10-28T09:07:56.771-0700 I COMMANDS [conn2] dropDatabase testdb starting
2014-10-28T09:07:56.776-0700 D STORAGE  [conn2] dropDatabase testdb
2014-10-28T09:07:56.776-0700 D JOURNAL  [journal] journal REMAPPRIVATEVIEW done startedAt: 2 n:1 0ms
2014-10-28T09:07:56.795-0700 I JOURNAL  [conn2] removeJournalFiles
2014-10-28T09:07:56.804-0700 D STORAGE  [conn2] flushing directory /home/ace/scratch/CAP-1268/data/journal
2014-10-28T09:07:56.822-0700 D JOURNAL  [conn2] removeJournalFiles end
2014-10-28T09:07:56.824-0700 D JOURNAL  [journal] journal REMAPPRIVATEVIEW done startedAt: 3 n:1 1ms
2014-10-28T09:07:56.824-0700 D JOURNAL  [journal] journal REMAPPRIVATEVIEW done startedAt: 0 n:1 0ms
2014-10-28T09:07:56.829-0700 D STORAGE  [conn2] remove file /home/ace/scratch/CAP-1268/data/testdb.ns
2014-10-28T09:07:56.831-0700 I COMMANDS [conn2] dropDatabase testdb finished
2014-10-28T09:07:56.831-0700 I QUERY    [conn2] command testdb.$cmd command: dropDatabase { dropDatabase: 1.0 } keyUpdates:0 numYields:0  reslen:57 230ms
2014-10-28T09:07:56.831-0700 I -        [conn3] Invariant failure db src/mongo/db/commands/mr.cpp 1366
2014-10-28T09:07:56.845-0700 I CONTROL  [conn3] 
 0xfad813 0xf6260b 0xf47c99 0xa471a2 0xa8f7e2 0xa902cb 0xa90c17 0xc5c86f 0xb63f26 0x8e7a93 0xf743cb 0x7f717d1f2b50 0x7f717c3920ed
----- BEGIN BACKTRACE -----
{"backtrace":[{"b":"400000","o":"BAD813"},{"b":"400000","o":"B6260B"},{"b":"400000","o":"B47C99"},{"b":"400000","o":"6471A2"},{"b":"400000","o":"68F7E2"},{"b":"400000","o":"6902CB"},{"b":"400000","o":"690C17"},{"b":"400000","o":"85C86F"},{"b":"400000","o":"763F26"},{"b":"400000","o":"4E7A93"},{"b":"400000","o":"B743CB"},{"b":"7F717D1EC000","o":"6B50"},{"b":"7F717C2B6000","o":"DC0ED"}],"processInfo":{ "mongodbVersion" : "2.7.9-pre-", "gitVersion" : "364b03260ef5e06a58568c57a1e44fd2fcd7cb8e", "uname" : { "sysname" : "Linux", "release" : "3.2.0-4-amd64", "version" : "#1 SMP Debian 3.2.54-2", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000", "buildId" : "B787723AE5862AF9456FDA1E3A515DBE580B06D5" }, { "b" : "7FFF77BEF000", "elfType" : 3, "buildId" : "DCCF85726CC4A0AF9876B5683FE535A43F8C7B93" }, { "b" : "7F717D1EC000", "path" : "/lib/x86_64-linux-gnu/libpthread.so.0", "elfType" : 3, "buildId" : "18A3AA880A2D6668749F9E0B3A62E31CC332BCCB" }, { "b" : "7F717CFE4000", "path" : "/lib/x86_64-linux-gnu/librt.so.1", "elfType" : 3, "buildId" : "64EDF4AB5F6BB69CC21C5189A5381632828C1DDF" }, { "b" : "7F717CDE0000", "path" : "/lib/x86_64-linux-gnu/libdl.so.2", "elfType" : 3, "buildId" : "0A2AFB493CB6339DC33C3FCD42B31A56256DB883" }, { "b" : "7F717CAD9000", "path" : "/usr/lib/x86_64-linux-gnu/libstdc++.so.6", "elfType" : 3, "buildId" : "8711429397A5AF8B6269B867D830EDF6E0225B8D" }, { "b" : "7F717C857000", "path" : "/lib/x86_64-linux-gnu/libm.so.6", "elfType" : 3, "buildId" : "6F617CE57B239A34D5262165156D3C427FBC4E6F" }, { "b" : "7F717C641000", "path" : "/lib/x86_64-linux-gnu/libgcc_s.so.1", "elfType" : 3, "buildId" : "F980B1188708F8D8B5C35D185444AF4CB939AA1E" }, { "b" : "7F717C2B6000", "path" : "/lib/x86_64-linux-gnu/libc.so.6", "elfType" : 3, "buildId" : "44E7FC086557EB258EAFE64F71E5E5D4E46DF815" }, { "b" : "7F717D408000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3, "buildId" : "3A7624F2274F9BD6E3D5F171B72BC08D1F7F8EE0" } ] }}
 mongod(_ZN5mongo15printStackTraceERSo+0x23) [0xfad813]
 mongod(_ZN5mongo10logContextEPKc+0xDB) [0xf6260b]
 mongod(_ZN5mongo15invariantFailedEPKcS1_j+0x99) [0xf47c99]
 mongod(_ZN5mongo2mr16MapReduceCommand3runEPNS_16OperationContextERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb+0x16E2) [0xa471a2]
 mongod(_ZN5mongo12_execCommandEPNS_16OperationContextEPNS_7CommandERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb+0x42) [0xa8f7e2]
 mongod(_ZN5mongo7Command11execCommandEPNS_16OperationContextEPS0_iPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0x8EB) [0xa902cb]
 mongod(_ZN5mongo12_runCommandsEPNS_16OperationContextEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x487) [0xa90c17]
 mongod(_ZN5mongo11newRunQueryEPNS_16OperationContextERNS_7MessageERNS_12QueryMessageERNS_5CurOpES3_b+0x7EF) [0xc5c86f]
 mongod(_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortEb+0xC26) [0xb63f26]
 mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0xA3) [0x8e7a93]
 mongod(_ZN5mongo17PortMessageServer17handleIncomingMsgEPv+0x48B) [0xf743cb]
 libpthread.so.0(+0x6B50) [0x7f717d1f2b50]
 libc.so.6(clone+0x6D) [0x7f717c3920ed]
-----  END BACKTRACE  -----
2014-10-28T09:07:56.845-0700 I -        [conn3] 

***aborting after invariant() failure


2014-10-28T09:07:56.859-0700 F -        [conn3] Got signal: 6 (Aborted).

 0xfad813 0xfad3c2 0xfad746 0x7f717c2e84f0 0x7f717c2e8475 0x7f717c2eb6f0 0xf47cca 0xa471a2 0xa8f7e2 0xa902cb 0xa90c17 0xc5c86f 0xb63f26 0x8e7a93 0xf743cb 0x7f717d1f2b50 0x7f717c3920ed
----- BEGIN BACKTRACE -----
{"backtrace":[{"b":"400000","o":"BAD813"},{"b":"400000","o":"BAD3C2"},{"b":"400000","o":"BAD746"},{"b":"7F717C2B6000","o":"324F0"},{"b":"7F717C2B6000","o":"32475"},{"b":"7F717C2B6000","o":"356F0"},{"b":"400000","o":"B47CCA"},{"b":"400000","o":"6471A2"},{"b":"400000","o":"68F7E2"},{"b":"400000","o":"6902CB"},{"b":"400000","o":"690C17"},{"b":"400000","o":"85C86F"},{"b":"400000","o":"763F26"},{"b":"400000","o":"4E7A93"},{"b":"400000","o":"B743CB"},{"b":"7F717D1EC000","o":"6B50"},{"b":"7F717C2B6000","o":"DC0ED"}],"processInfo":{ "mongodbVersion" : "2.7.9-pre-", "gitVersion" : "364b03260ef5e06a58568c57a1e44fd2fcd7cb8e", "uname" : { "sysname" : "Linux", "release" : "3.2.0-4-amd64", "version" : "#1 SMP Debian 3.2.54-2", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000", "buildId" : "B787723AE5862AF9456FDA1E3A515DBE580B06D5" }, { "b" : "7FFF77BEF000", "elfType" : 3, "buildId" : "DCCF85726CC4A0AF9876B5683FE535A43F8C7B93" }, { "b" : "7F717D1EC000", "path" : "/lib/x86_64-linux-gnu/libpthread.so.0", "elfType" : 3, "buildId" : "18A3AA880A2D6668749F9E0B3A62E31CC332BCCB" }, { "b" : "7F717CFE4000", "path" : "/lib/x86_64-linux-gnu/librt.so.1", "elfType" : 3, "buildId" : "64EDF4AB5F6BB69CC21C5189A5381632828C1DDF" }, { "b" : "7F717CDE0000", "path" : "/lib/x86_64-linux-gnu/libdl.so.2", "elfType" : 3, "buildId" : "0A2AFB493CB6339DC33C3FCD42B31A56256DB883" }, { "b" : "7F717CAD9000", "path" : "/usr/lib/x86_64-linux-gnu/libstdc++.so.6", "elfType" : 3, "buildId" : "8711429397A5AF8B6269B867D830EDF6E0225B8D" }, { "b" : "7F717C857000", "path" : "/lib/x86_64-linux-gnu/libm.so.6", "elfType" : 3, "buildId" : "6F617CE57B239A34D5262165156D3C427FBC4E6F" }, { "b" : "7F717C641000", "path" : "/lib/x86_64-linux-gnu/libgcc_s.so.1", "elfType" : 3, "buildId" : "F980B1188708F8D8B5C35D185444AF4CB939AA1E" }, { "b" : "7F717C2B6000", "path" : "/lib/x86_64-linux-gnu/libc.so.6", "elfType" : 3, "buildId" : "44E7FC086557EB258EAFE64F71E5E5D4E46DF815" }, { "b" : "7F717D408000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3, "buildId" : "3A7624F2274F9BD6E3D5F171B72BC08D1F7F8EE0" } ] }}
 mongod(_ZN5mongo15printStackTraceERSo+0x23) [0xfad813]
 mongod(+0xBAD3C2) [0xfad3c2]
 mongod(+0xBAD746) [0xfad746]
 libc.so.6(+0x324F0) [0x7f717c2e84f0]
 libc.so.6(gsignal+0x35) [0x7f717c2e8475]
 libc.so.6(abort+0x180) [0x7f717c2eb6f0]
 mongod(_ZN5mongo15invariantFailedEPKcS1_j+0xCA) [0xf47cca]
 mongod(_ZN5mongo2mr16MapReduceCommand3runEPNS_16OperationContextERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb+0x16E2) [0xa471a2]
 mongod(_ZN5mongo12_execCommandEPNS_16OperationContextEPNS_7CommandERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb+0x42) [0xa8f7e2]
 mongod(_ZN5mongo7Command11execCommandEPNS_16OperationContextEPS0_iPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0x8EB) [0xa902cb]
 mongod(_ZN5mongo12_runCommandsEPNS_16OperationContextEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x487) [0xa90c17]
 mongod(_ZN5mongo11newRunQueryEPNS_16OperationContextERNS_7MessageERNS_12QueryMessageERNS_5CurOpES3_b+0x7EF) [0xc5c86f]
 mongod(_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortEb+0xC26) [0xb63f26]
 mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0xA3) [0x8e7a93]
 mongod(_ZN5mongo17PortMessageServer17handleIncomingMsgEPv+0x48B) [0xf743cb]
 libpthread.so.0(+0x6B50) [0x7f717d1f2b50]
 libc.so.6(clone+0x6D) [0x7f717c3920ed]
-----  END BACKTRACE  -----