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Type: Bug
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Resolution: Gone away
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Priority: Major - P3
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None
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Affects Version/s: None
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Component/s: MapReduce
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Labels:None
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ALL
I am using Mongodb 3.2.1 which configured having
replica set(primary*1 + secondary*2) in 2 shardings.
(with 1 mongos and 1 config server, I have 8 VMs totally)
the problem is when I trying to issue a mapreduce command, its returns an error msg:
------------------------------------------------------------
pymongo.errors.OperationFailure: network error while attempting to run command 'mapreduce' on host '192.168.8.132:27019'
------------------------------------------------------------
And I checked the logs in 192.168.8.132,
here comes the error meg:
2017-03-28T00:23:10.523+0800 I ACCESS [conn17] Successfully authenticated as principal __system on local 2017-03-28T00:23:10.559+0800 F - [conn17] Invalid access at address: 0 2017-03-28T00:23:10.638+0800 F - [conn17] Got signal: 11 (Segmentation fault).
and its very interesting that every time the crashed VM is different.
sometimes192.168.8.132, sometimes will be 134 or 136
by the way, I used the test data as below
http://api.mongodb.com/python/current/examples/aggregation.html
could somebody kindly figure out whats wrong with my mongod?
thx!!
---------------------------whole log-----------------------------
2017-03-28T00:23:10.523+0800 I ACCESS [conn17] Successfully authenticated as principal __system on local 2017-03-28T00:23:10.559+0800 F - [conn17] Invalid access at address: 0 2017-03-28T00:23:10.638+0800 F - [conn17] Got signal: 11 (Segmentation fault). 0x132c032 0x132b189 0x132b508 0x7f55804a2130 0x9679eb 0x185bb4d 0x16610fd 0x185bc5b 0x1706ba3 0x1706e73 0x159d0d3 0x15ac8c5 0x15acc14 0x187fbbd 0x187fd61 0x15d4585 0x187aa8b 0x128a27b 0x128a38d 0x127da22 0xb640a5 0xb6f85e 0xbcc4b3 0xbcd35c 0xb260b0 0xcdb315 0x9b76bc 0x12d8c55 0x7f558049adf5 0x7f55801c81ad ----- BEGIN BACKTRACE ----- {"backtrace":[{"b":"400000","o":"F2C032","s":"_ZN5mongo15printStackTraceERSo"},{"b":"400000","o":"F2B189"},{"b":"400000","o":"F2B508"},{"b":"7F5580493000","o":"F130"},{"b":"400000","o":"5679EB","s":"_ZN2js21CrashAtUnhandlableOOMEPKc"},{"b":"400000","o":"145BB4D","s":"_ZN9JSRuntime16createJitRuntimeEP9JSContext"},{"b":"400000","o":"12610FD","s":"_ZN2JS4Zone13createJitZoneEP9JSContext"},{"b":"400000","o":"145BC5B","s":"_ZN13JSCompartment26ensureJitCompartmentExistsEP9JSContext"},{"b":"400000","o":"1306BA3"},{"b":"400000","o":"1306E73","s":"_ZN2js3jit22CanEnterBaselineMethodEP9JSContextRNS_8RunStateE"},{"b":"400000","o":"119D0D3","s":"_ZN2js9RunScriptEP9JSContextRNS_8RunStateE"},{"b":"400000","o":"11AC8C5","s":"_ZN2js13ExecuteKernelEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectRKNS2_5ValueENS_11ExecuteTypeENS_16AbstractFramePtrEPS9_"},{"b":"400000","o":"11ACC14","s":"_ZN2js7ExecuteEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectPNS2_5ValueE"},{"b":"400000","o":"147FBBD"},{"b":"400000","o":"147FD61","s":"_ZN2JS8EvaluateEP9JSContextNS_6HandleIP8JSObjectEERKNS_22ReadOnlyCompileOptionsEPKcmNS_13MutableHandleINS_5ValueEEE"},{"b":"400000","o":"11D4585","s":"_ZN9JSRuntime15initSelfHostingEP9JSContext"},{"b":"400000","o":"147AA8B","s":"_ZN2js10NewContextEP9JSRuntimem"},{"b":"400000","o":"E8A27B","s":"_ZN5mongo5mozjs14MozJSImplScope10MozRuntimeC2EPKNS0_17MozJSScriptEngineE"},{"b":"400000","o":"E8A38D","s":"_ZN5mongo5mozjs14MozJSImplScopeC1EPNS0_17MozJSScriptEngineE"},{"b":"400000","o":"E7DA22","s":"_ZN5mongo5mozjs17MozJSScriptEngine27createScopeForCurrentThreadEv"},{"b":"400000","o":"7640A5","s":"_ZN5mongo2mr5State4initEv"},{"b":"400000","o":"76F85E","s":"_ZN5mongo2mr16MapReduceCommand3runEPNS_16OperationContextERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderE"},{"b":"400000","o":"7CC4B3","s":"_ZN5mongo7Command3runEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS3_21ReplyBuilderInterfaceE"},{"b":"400000","o":"7CD35C","s":"_ZN5mongo7Command11execCommandEPNS_16OperationContextEPS0_RKNS_3rpc16RequestInterfaceEPNS4_21ReplyBuilderInterfaceE"},{"b":"400000","o":"7260B0","s":"_ZN5mongo11runCommandsEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS2_21ReplyBuilderInterfaceE"},{"b":"400000","o":"8DB315","s":"_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE"},{"b":"400000","o":"5B76BC","s":"_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortE"},{"b":"400000","o":"ED8C55","s":"_ZN5mongo17PortMessageServer17handleIncomingMsgEPv"},{"b":"7F5580493000","o":"7DF5"},{"b":"7F55800D2000","o":"F61AD","s":"clone"}],"processInfo":{ "mongodbVersion" : "3.2.12", "gitVersion" : "ef3e1bc78e997f0d9f22f45aeb1d8e3b6ac14a14", "compiledModules" : [], "uname" : { "sysname" : "Linux", "release" : "3.10.0-229.el7.x86_64", "version" : "#1 SMP Fri Mar 6 11:36:42 UTC 2015", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000", "buildId" : "BAAC1A970F6D0F06B88D0DE75BF06E4C260939EC" }, { "b" : "7FFF2D4FE000", "elfType" : 3, "buildId" : "CBFB9E3C89636A82FF8DA0DBDD27455704C5A38F" }, { "b" : "7F55813BA000", "path" : "/lib64/libssl.so.10", "elfType" : 3, "buildId" : "E65153BA5AB385F041E431280280A31991F2C7C7" }, { "b" : "7F5580FD3000", "path" : "/lib64/libcrypto.so.10", "elfType" : 3, "buildId" : "F34B9DC2DD7C42C5BEDB39370F379F0D3FB8EE5C" }, { "b" : "7F5580DCB000", "path" : "/lib64/librt.so.1", "elfType" : 3, "buildId" : "7376A07360DC57189A8F92B20AA4AA1CAEA80551" }, { "b" : "7F5580BC7000", "path" : "/lib64/libdl.so.2", "elfType" : 3, "buildId" : "4DFEE4EA9AE8FDD4C71BD4CCC0727222F19DF810" }, { "b" : "7F55808C5000", "path" : "/lib64/libm.so.6", "elfType" : 3, "buildId" : "A1AA62B29765BE03A36BF927B047EEEF8696EEC6" }, { "b" : "7F55806AF000", "path" : "/lib64/libgcc_s.so.1", "elfType" : 3, "buildId" : "5D3D7256AE68BCFF41E312A24825ED80ECA88A73" }, { "b" : "7F5580493000", "path" : "/lib64/libpthread.so.0", "elfType" : 3, "buildId" : "12F30315D4F4A2FE58B1977405C8B5515861E66B" }, { "b" : "7F55800D2000", "path" : "/lib64/libc.so.6", "elfType" : 3, "buildId" : "C31FFE7942BFD77B2FCA8F9BD5709D387A86D3BC" }, { "b" : "7F5581627000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3, "buildId" : "9866E1D2BA61EBB4CE4F009FACDAACC24EF3B804" }, { "b" : "7F557FE86000", "path" : "/lib64/libgssapi_krb5.so.2", "elfType" : 3, "buildId" : "34672D541C8C9C5C1C25CB4F3F332CC9D3E604AD" }, { "b" : "7F557FBA3000", "path" : "/lib64/libkrb5.so.3", "elfType" : 3, "buildId" : "45CB7F6CD322F5B55FF8B635F7EC1578631CCAEA" }, { "b" : "7F557F99F000", "path" : "/lib64/libcom_err.so.2", "elfType" : 3, "buildId" : "3A1166709F88740C49E060731832E3FAD2DFB66B" }, { "b" : "7F557F76D000", "path" : "/lib64/libk5crypto.so.3", "elfType" : 3, "buildId" : "23A2D854538903E2B84EF0882046DD95522C8B59" }, { "b" : "7F557F557000", "path" : "/lib64/libz.so.1", "elfType" : 3, "buildId" : "E45643F27F3B3E960F3691AFC6EC27A98EF7B46B" }, { "b" : "7F557F348000", "path" : "/lib64/libkrb5support.so.0", "elfType" : 3, "buildId" : "F4A3D5E7E23F871751CA8F250421F8CF83447AD2" }, { "b" : "7F557F144000", "path" : "/lib64/libkeyutils.so.1", "elfType" : 3, "buildId" : "2E01D5AC08C1280D013AAB96B292AC58BC30A263" }, { "b" : "7F557EF2A000", "path" : "/lib64/libresolv.so.2", "elfType" : 3, "buildId" : "AC596E865AF0D14B10F7B707F47D2031AD6D68DC" }, { "b" : "7F557ED05000", "path" : "/lib64/libselinux.so.1", "elfType" : 3, "buildId" : "82FF6B18E1E42825CC2D060F969479AD4AF2F62C" }, { "b" : "7F557EAA4000", "path" : "/lib64/libpcre.so.1", "elfType" : 3, "buildId" : "298B19C64B19995F2AA4DA7B852E90BA5302F630" }, { "b" : "7F557E87F000", "path" : "/lib64/liblzma.so.5", "elfType" : 3, "buildId" : "218D03D1F6CF1A099A4D467B5E8ECF4F2BF45750" } ] }} mongod(_ZN5mongo15printStackTraceERSo+0x32) [0x132c032] mongod(+0xF2B189) [0x132b189] mongod(+0xF2B508) [0x132b508] libpthread.so.0(+0xF130) [0x7f55804a2130] mongod(_ZN2js21CrashAtUnhandlableOOMEPKc+0x5E) [0x9679eb] mongod(_ZN9JSRuntime16createJitRuntimeEP9JSContext+0xCD) [0x185bb4d] mongod(_ZN2JS4Zone13createJitZoneEP9JSContext+0x9D) [0x16610fd] mongod(_ZN13JSCompartment26ensureJitCompartmentExistsEP9JSContext+0xBB) [0x185bc5b] mongod(+0x1306BA3) [0x1706ba3] mongod(_ZN2js3jit22CanEnterBaselineMethodEP9JSContextRNS_8RunStateE+0x53) [0x1706e73] mongod(_ZN2js9RunScriptEP9JSContextRNS_8RunStateE+0x123) [0x159d0d3] mongod(_ZN2js13ExecuteKernelEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectRKNS2_5ValueENS_11ExecuteTypeENS_16AbstractFramePtrEPS9_+0x1B5) [0x15ac8c5] mongod(_ZN2js7ExecuteEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectPNS2_5ValueE+0xC4) [0x15acc14] mongod(+0x147FBBD) [0x187fbbd] mongod(_ZN2JS8EvaluateEP9JSContextNS_6HandleIP8JSObjectEERKNS_22ReadOnlyCompileOptionsEPKcmNS_13MutableHandleINS_5ValueEEE+0x61) [0x187fd61] mongod(_ZN9JSRuntime15initSelfHostingEP9JSContext+0x315) [0x15d4585] mongod(_ZN2js10NewContextEP9JSRuntimem+0x12B) [0x187aa8b] mongod(_ZN5mongo5mozjs14MozJSImplScope10MozRuntimeC2EPKNS0_17MozJSScriptEngineE+0x11B) [0x128a27b] mongod(_ZN5mongo5mozjs14MozJSImplScopeC1EPNS0_17MozJSScriptEngineE+0x4D) [0x128a38d] mongod(_ZN5mongo5mozjs17MozJSScriptEngine27createScopeForCurrentThreadEv+0x22) [0x127da22] mongod(_ZN5mongo2mr5State4initEv+0x35) [0xb640a5] mongod(_ZN5mongo2mr16MapReduceCommand3runEPNS_16OperationContextERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderE+0x44E) [0xb6f85e] mongod(_ZN5mongo7Command3runEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS3_21ReplyBuilderInterfaceE+0x463) [0xbcc4b3] mongod(_ZN5mongo7Command11execCommandEPNS_16OperationContextEPS0_RKNS_3rpc16RequestInterfaceEPNS4_21ReplyBuilderInterfaceE+0x3FC) [0xbcd35c] mongod(_ZN5mongo11runCommandsEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS2_21ReplyBuilderInterfaceE+0x1F0) [0xb260b0] mongod(_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0xB45) [0xcdb315] mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortE+0xEC) [0x9b76bc] mongod(_ZN5mongo17PortMessageServer17handleIncomingMsgEPv+0x325) [0x12d8c55] libpthread.so.0(+0x7DF5) [0x7f558049adf5] libc.so.6(clone+0x6D) [0x7f55801c81ad] ----- END BACKTRACE ----- 2017-03-28T00:23:10.639+0800 F - [conn17] /proc/self/maps: 00400000-02022000 r-xp 00000000 08:03 38065436 /usr/bin/mongod 2017-03-28T00:23:10.639+0800 F - [conn17] 02022000-020f5000 rw-p 01c21000 08:03 38065436 /usr/bin/mongod 2017-03-28T00:23:10.639+0800 F - [conn17] 020f5000-02165000 rw-p 00000000 00:00 0 2017-03-28T00:23:10.639+0800 F - [conn17] 03366000-03f66000 rw-p 00000000 00:00 0 [heap] 2017-03-28T00:23:10.639+0800 F - [conn17] 03f66000-087c6000 rw-p 00000000 00:00 0 [heap] 2017-03-28T00:23:10.639+0800 F - [conn17] 7f5552300000-7f5553400000 rw-p 00000000 00:00 0 2017-03-28T00:23:10.639+0800 F - [conn17] 7f55534f8000-7f55534f9000 ---p 00000000 00:00 0 2017-03-28T00:23:10.639+0800 F - [conn17] 7f55534f9000-7f55535f9000 rw-p 00000000 00:00 0 [stack:58085] 2017-03-28T00:23:10.639+0800 F - [conn17] 7f55535f9000-7f55535fa000 ---p 00000000 00:00 0 2017-03-28T00:23:10.639+0800 F - [conn17] 7f55535fa000-7f55536fa000 rw-p 00000000 00:00 0 [stack:58076] 2017-03-28T00:23:10.639+0800 F - [conn17] 7f55536fa000-7f55536fb000 ---p 00000000 00:00 0 2017-03-28T00:23:10.639+0800 F - [conn17] 7f55536fb000-7f55537fb000 rw-p 00000000 00:00 0 [stack:57762] 2017-03-28T00:23:10.639+0800 F - [conn17] 7f55537fb000-7f55537fc000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f55537fc000-7f55538fc000 rw-p 00000000 00:00 0 [stack:57761] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f55538fc000-7f55538fd000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f55538fd000-7f55539fd000 rw-p 00000000 00:00 0 [stack:57760] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f55539fd000-7f55539fe000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f55539fe000-7f5553afe000 rw-p 00000000 00:00 0 [stack:57758] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5553afe000-7f5553aff000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5553aff000-7f55542ff000 rw-p 00000000 00:00 0 [stack:57755] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f55542ff000-7f5554300000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5554300000-7f5554b00000 rw-p 00000000 00:00 0 [stack:57754] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5554b00000-7f5554b01000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5554b01000-7f5555301000 rw-p 00000000 00:00 0 [stack:57753] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5555301000-7f5555302000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5555302000-7f5555b02000 rw-p 00000000 00:00 0 [stack:57752] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5555b02000-7f5555b03000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5555b03000-7f5556303000 rw-p 00000000 00:00 0 [stack:57751] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5556303000-7f5556304000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5556304000-7f5556b04000 rw-p 00000000 00:00 0 [stack:57750] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5556b04000-7f5556b05000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5556b05000-7f5557305000 rw-p 00000000 00:00 0 [stack:57749] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557305000-7f5557306000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557306000-7f5557b06000 rw-p 00000000 00:00 0 [stack:57748] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557b06000-7f5557b07000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557b07000-7f5557c07000 rw-p 00000000 00:00 0 [stack:57636] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557c07000-7f5557c08000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557c08000-7f5557d08000 rw-p 00000000 00:00 0 [stack:57635] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557d08000-7f5557d09000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557d09000-7f5557e09000 rw-p 00000000 00:00 0 [stack:57757] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557e09000-7f5557e0a000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557e0a000-7f5557f0a000 rw-p 00000000 00:00 0 [stack:57633] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557f0a000-7f5557f0b000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5557f0b000-7f555870b000 rw-p 00000000 00:00 0 [stack:57632] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555870b000-7f555870c000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555870c000-7f5558f0c000 rw-p 00000000 00:00 0 [stack:57631] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5558f0c000-7f5558f0d000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5558f0d000-7f555900d000 rw-p 00000000 00:00 0 [stack:57626] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555900d000-7f555900e000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555900e000-7f555910e000 rw-p 00000000 00:00 0 [stack:57625] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555910e000-7f555910f000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555910f000-7f555990f000 rw-p 00000000 00:00 0 [stack:57623] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555990f000-7f5559910000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f5559910000-7f555a110000 rw-p 00000000 00:00 0 [stack:57622] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555a110000-7f555a111000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555a111000-7f555a911000 rw-p 00000000 00:00 0 [stack:57621] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555a911000-7f555a912000 ---p 00000000 00:00 0 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555a912000-7f555b112000 rw-p 00000000 00:00 0 [stack:57620] 2017-03-28T00:23:10.640+0800 F - [conn17] 7f555b112000-7f555b113000 ---p 00000000 00:00 0 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555b113000-7f555b913000 rw-p 00000000 00:00 0 [stack:57619] 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555b913000-7f555b914000 ---p 00000000 00:00 0 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555b914000-7f555c114000 rw-p 00000000 00:00 0 [stack:57618] 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555c114000-7f555c115000 ---p 00000000 00:00 0 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555c115000-7f555c915000 rw-p 00000000 00:00 0 [stack:57617] 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555c915000-7f555c916000 ---p 00000000 00:00 0 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555c916000-7f555d116000 rw-p 00000000 00:00 0 [stack:57616] 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555d116000-7f555d117000 ---p 00000000 00:00 0 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555d117000-7f555d917000 rw-p 00000000 00:00 0 [stack:57615] 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555d917000-7f555d918000 ---p 00000000 00:00 0 2017-03-28T00:23:10.641+0800 F - [conn17] 7f555d918000-7f555e118000 rw-p 00000000 00:00 0 [stack:57614]
- is duplicated by
-
SERVER-28520 mongodb crashed during mapreduce
- Closed