m31001| Thu Feb 24 21:25:56 [conn1] Assertion failure foundIndex db/commands/mr.cpp 587
m31001| 0x817e6eb 0x8193713 0x84716b5 0x847ee28 0x84416a1 0x8443d14 0x82883dc 0x828d96f 0x83b2d87 0x83b5adc 0x8520cb3 0x81f9598 0x853569d 0x79d542 0x1e5b6e
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo12sayDbContextEPKc+0xcb) [0x817e6eb]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo8assertedEPKcS1_j+0x143) [0x8193713]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo2mr5State11finalReduceEPNS_5CurOpERNS_19ProgressMeterHolderE+0x565) [0x84716b5]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo2mr16MapReduceCommand3runERKSsRNS_7BSONObjERSsRNS_14BSONObjBuilderEb+0xf78) [0x847ee28]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo11execCommandEPNS_7CommandERNS_6ClientEiPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0x211) [0x84416a1]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo12_runCommandsEPKcRNS_7BSONObjERNS_10BufBuilderERNS_14BSONObjBuilderEbi+0x694) [0x8443d14]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo11runCommandsEPKcRNS_7BSONObjERNS_5CurOpERNS_10BufBuilderERNS_14BSONObjBuilderEbi+0x4c) [0x82883dc]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(ZN5mongo8runQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1+0x2e6f) [0x828d96f]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod [0x83b2d87]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_8SockAddrE+0x70c) [0x83b5adc]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5mongo10connThreadEPNS_13MessagingPortE+0x273) [0x8520cb3]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(_ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvPN5mongo13MessagingPortEENS2_5list1INS2_5valueIS6_EEEEEEE3runEv+0x18) [0x81f9598]
m31001| /mnt/slaves/Linux_32bit/mongo/mongod(thread_proxy+0x7d) [0x853569d]
Thu Feb 24 21:25:56 uncaught exception: map reduce failed:{
"assertion" : "assertion db/commands/mr.cpp:587",
"errmsg" : "db assertion failure",
"ok" : 0
}
m31001| /lib/i686/nosegneg/libpthread.so.0 [0x79d542]
failed to load: /mnt/slaves/Linux_32bit/mongo/jstests/repl/basic1.js
m31001| /lib/i686/nosegneg/libc.so.6(clone+0x5e) [0x1e5b6e]

<http://buildbot.mongodb.org/builders/Linux%2032-bit/builds/2855/steps/test_4/logs/stdio>