If filed a new issue, because my backtrace looks quite different from the backtrace that was already reported by other people. The only thing i can tell is: heavy reads, some writes. MongoDB 2.0.0 went into production on our server yesterday in the evening and the crash occured now two times in two hours. Here are the backtraces:

Tue Oct 11 09:11:52 [initandlisten] connection accepted from 10.10.0.12:58806 #68483
Tue Oct 11 09:11:53 Invalid access at address: 0x68b9000

Tue Oct 11 09:11:53 Got signal: 11 (Segmentation fault).

Tue Oct 11 09:11:53 [initandlisten] connection accepted from 10.10.0.12:58828 #68484
Tue Oct 11 09:11:53 Backtrace:
0xa83fc9 0xa845a0 0x7fcb5c6828f0 0x7fcb5bbc75e5 0x51d300 0x54cd98 0x54d0ac 0x55a617 0x55b501 0x55bdd4 0x8d54a6 0x8e3475 0x99a242 0x99cc9c 0x973fe9 0x97512f 0x95d725 0x9607b4 0x87e037 0x88485c
/opt/mongodb/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0xa83fc9]
/opt/mongodb/bin/mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x220) [0xa845a0]
/lib/libpthread.so.0(+0xf8f0) [0x7fcb5c6828f0]
/lib/libc.so.6(+0x855e5) [0x7fcb5bbc75e5]
/opt/mongodb/bin/mongod(ZN5mongo20compareElementValuesERKNS_11BSONElementES2+0x2d0) [0x51d300]
/opt/mongodb/bin/mongod(ZN5mongo20fieldIntervalOverlapERKNS_13FieldIntervalES2_RS0+0x228) [0x54cd98]
/opt/mongodb/bin/mongod(ZN5mongo10FieldRangeaNERKS0+0xac) [0x54d0ac]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSet16processOpElementEPKcRKNS_11BSONElementEbb+0x97) [0x55a617]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSet17processQueryFieldERKNS_11BSONElementEb+0x4a1) [0x55b501]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSetC1EPKcRKNS_7BSONObjEbb+0x194) [0x55bdd4]
/opt/mongodb/bin/mongod(_ZN5mongo16MultiPlanScannerC1EPKcRKNS_7BSONObjES5_PKNS_11BSONElementEbS5_S5_bb+0x1f6) [0x8d54a6]
/opt/mongodb/bin/mongod(ZN5mongo25NamespaceDetailsTransient9getCursorEPKcRKNS_7BSONObjES5+0x5e5) [0x8e3475]
/opt/mongodb/bin/mongod(_ZN5mongo12GroupCommand5groupESsRKSsRKNS_7BSONObjES3_SsSsPKcS3_SsRSsRNS_14BSONObjBuilderE+0x332) [0x99a242]
/opt/mongodb/bin/mongod(_ZN5mongo12GroupCommand3runERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb+0x11ec) [0x99cc9c]
/opt/mongodb/bin/mongod(_ZN5mongo11execCommandEPNS_7CommandERNS_6ClientEiPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0xb49) [0x973fe9]
/opt/mongodb/bin/mongod(_ZN5mongo12_runCommandsEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x6ff) [0x97512f]
/opt/mongodb/bin/mongod(_ZN5mongo11runCommandsEPKcRNS_7BSONObjERNS_5CurOpERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x35) [0x95d725]
/opt/mongodb/bin/mongod(ZN5mongo8runQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1+0xee4) [0x9607b4]
/opt/mongodb/bin/mongod() [0x87e037]
/opt/mongodb/bin/mongod(_ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0x55c) [0x88485c]

Logstream::get called in uninitialized state
Tue Oct 11 09:11:54 ERROR: Client::~Client _context should be null but is not; client:conn
Logstream::get called in uninitialized state
Tue Oct 11 09:11:54 ERROR: Client::shutdown not called: conn
Tue Oct 11 09:11:54 Got signal: 6 (Aborted).

Tue Oct 11 09:11:54 Backtrace:
0xa83fc9 0x7fcb5bb75af0 0x7fcb5bb75a75 0x7fcb5bb795c0 0x7fcb5bb6e941 0x67a48f 0x794b48 0x79aedc 0x57756f 0x579624 0xa9ea30 0x7fcb5c6799ca 0x7fcb5bc2870d
/opt/mongodb/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0xa83fc9]
/lib/libc.so.6(+0x33af0) [0x7fcb5bb75af0]
/lib/libc.so.6(gsignal+0x35) [0x7fcb5bb75a75]
/lib/libc.so.6(abort+0x180) [0x7fcb5bb795c0]
/lib/libc.so.6(__assert_fail+0xf1) [0x7fcb5bb6e941]
/opt/mongodb/bin/mongod(_ZN5mongo9MongoFile17totalMappedLengthEv+0x20f) [0x67a48f]
/opt/mongodb/bin/mongod(_ZN5mongo15sayMemoryStatusEv+0xd8) [0x794b48]
/opt/mongodb/bin/mongod(_ZN5mongo19ClientCursorMonitor3runEv+0x11c) [0x79aedc]
/opt/mongodb/bin/mongod(_ZN5mongo13BackgroundJob7jobBodyEN5boost10shared_ptrINS0_9JobStatusEEE+0xbf) [0x57756f]
/opt/mongodb/bin/mongod(_ZN5boost6detail11thread_dataINS_3_bi6bind_tIvNS_4_mfi3mf1IvN5mongo13BackgroundJobENS_10shared_ptrINS7_9JobStatusEEEEENS2_5list2INS2_5valueIPS7_EENSD_ISA_EEEEEEE3runEv+0x74) [0x579624]
/opt/mongodb/bin/mongod(thread_proxy+0x80) [0xa9ea30]
/lib/libpthread.so.0(+0x69ca) [0x7fcb5c6799ca]
/lib/libc.so.6(clone+0x6d) [0x7fcb5bc2870d]

--->%--snip--->%----

Tue Oct 11 10:51:15 Got signal: 11 (Segmentation fault).

Tue Oct 11 10:51:16 Backtrace:
0xa83fc9 0xa845a0 0x7fbb46c348f0 0x7fbb461795e5 0x51d300 0x54cd98 0x54d0ac 0x55a617 0x55b501 0x55bdd4 0x8d54a6 0x8e3475 0x99a242 0x99cc9c 0x973fe9 0x97512f 0x95d725 0x9607b4 0x87e037 0x88485c
/opt/mongodb/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0xa83fc9]
/opt/mongodb/bin/mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x220) [0xa845a0]
/lib/libpthread.so.0(+0xf8f0) [0x7fbb46c348f0]
/lib/libc.so.6(+0x855e5) [0x7fbb461795e5]
/opt/mongodb/bin/mongod(ZN5mongo20compareElementValuesERKNS_11BSONElementES2+0x2d0) [0x51d300]
/opt/mongodb/bin/mongod(ZN5mongo20fieldIntervalOverlapERKNS_13FieldIntervalES2_RS0+0x228) [0x54cd98]
/opt/mongodb/bin/mongod(ZN5mongo10FieldRangeaNERKS0+0xac) [0x54d0ac]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSet16processOpElementEPKcRKNS_11BSONElementEbb+0x97) [0x55a617]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSet17processQueryFieldERKNS_11BSONElementEb+0x4a1) [0x55b501]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSetC1EPKcRKNS_7BSONObjEbb+0x194) [0x55bdd4]
/opt/mongodb/bin/mongod(_ZN5mongo16MultiPlanScannerC1EPKcRKNS_7BSONObjES5_PKNS_11BSONElementEbS5_S5_bb+0x1f6) [0x8d54a6]
/opt/mongodb/bin/mongod(ZN5mongo25NamespaceDetailsTransient9getCursorEPKcRKNS_7BSONObjES5+0x5e5) [0x8e3475]
/opt/mongodb/bin/mongod(_ZN5mongo12GroupCommand5groupESsRKSsRKNS_7BSONObjES3_SsSsPKcS3_SsRSsRNS_14BSONObjBuilderE+0x332) [0x99a242]
/opt/mongodb/bin/mongod(_ZN5mongo12GroupCommand3runERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb+0x11ec) [0x99cc9c]
/opt/mongodb/bin/mongod(_ZN5mongo11execCommandEPNS_7CommandERNS_6ClientEiPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0xb49) [0x973fe9]
/opt/mongodb/bin/mongod(_ZN5mongo12_runCommandsEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x6ff) [0x97512f]
/opt/mongodb/bin/mongod(_ZN5mongo11runCommandsEPKcRNS_7BSONObjERNS_5CurOpERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x35) [0x95d725]
/opt/mongodb/bin/mongod(ZN5mongo8runQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1+0xee4) [0x9607b4]
/opt/mongodb/bin/mongod() [0x87e037]
/opt/mongodb/bin/mongod(_ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0x55c) [0x88485c]

Logstream::get called in uninitialized state
Tue Oct 11 10:51:16 [initandlisten] connection accepted from 10.10.0.12:36644 #9736
Tue Oct 11 10:51:16 Invalid access at address: 0x4

Tue Oct 11 10:51:16 Got signal: 11 (Segmentation fault).

Tue Oct 11 10:51:16 Backtrace:
0xa83fc9 0xa845a0 0x7fbb46c348f0 0x54f7c9 0x55b0e4 0x55bdd4 0x8d54a6 0x960522 0x87e037 0x88485c 0xa96a46 0x635dd7 0x7fbb46c2b9ca 0x7fbb461da70d
/opt/mongodb/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0xa83fc9]
/opt/mongodb/bin/mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x220) [0xa845a0]
/lib/libpthread.so.0(+0xf8f0) [0x7fbb46c348f0]
/opt/mongodb/bin/mongod(_ZN5mongo10FieldRangeC1ERKNS_11BSONElementEbbb+0x199) [0x54f7c9]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSet17processQueryFieldERKNS_11BSONElementEb+0x84) [0x55b0e4]
/opt/mongodb/bin/mongod(_ZN5mongo13FieldRangeSetC1EPKcRKNS_7BSONObjEbb+0x194) [0x55bdd4]
/opt/mongodb/bin/mongod(_ZN5mongo16MultiPlanScannerC1EPKcRKNS_7BSONObjES5_PKNS_11BSONElementEbS5_S5_bb+0x1f6) [0x8d54a6]
/opt/mongodb/bin/mongod(ZN5mongo8runQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1+0xc52) [0x960522]
/opt/mongodb/bin/mongod() [0x87e037]
/opt/mongodb/bin/mongod(_ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0x55c) [0x88485c]
/opt/mongodb/bin/mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0x76) [0xa96a46]
/opt/mongodb/bin/mongod(_ZN5mongo3pms9threadRunEPNS_13MessagingPortE+0x287) [0x635dd7]
/lib/libpthread.so.0(+0x69ca) [0x7fbb46c2b9ca]
/lib/libc.so.6(clone+0x6d) [0x7fbb461da70d]