Running the following setup:

• Primary server: 72GB Ram, dual quad-core xeon.
• Replica 1: 72GB Ram, dual quad-core xeon.
• Replica 2: 16GB Ram, quad-core xeon.
• Replica 3: 16GB Ram, quad-core xeon. (Remote location)
• Arbiter

All servers are on CentOS 6 64bit. Primary, backup and one of the remote

Primary server crashed a few weeks ago, backup became primary. I didn't really look into it, just removed the member, deleted the files, and reset it since it was down for a long time i figured it'd be faster.

Today, it did the same thing again. When I restart it, it gives the same error output.

Fri Sep 13 07:03:44.555 Invalid access at address: 0x7fad73cd0e30 from thread: repl writer worker 10
Fri Sep 13 07:03:44.536 [conn74] end connection A.B.C.D:57698 (87 connections now open)
Fri Sep 13 07:03:44.669 Got signal: 7 (Bus error).
Fri Sep 13 07:03:45.000 Backtrace:
0xdddd81 0x6d0d29 0x6d12b2 0x36c860f500 0xa61281 0xa61a32 0xac44f3 0xac58df 0xa903fa 0xa924c7 0xa72449 0xc273d3 0xc26b18 0xdab721 0xe26609 0x36c8607851 0x36c82e890d
/usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xdddd81]
/usr/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0x6d0d29]
/usr/bin/mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x262) [0x6d12b2]
/lib64/libpthread.so.0() [0x36c860f500]
/usr/bin/mongod(ZN5mongo16NamespaceDetails10_stdAllocEib+0x641) [0xa61281]
/usr/bin/mongod(_ZN5mongo16NamespaceDetails13allocWillBeAtEPKci+0x32) [0xa61a32]
/usr/bin/mongod(_ZN5mongo11DataFileMgr6insertEPKcPKvibbbPb+0x1153) [0xac44f3]
/usr/bin/mongod(_ZN5mongo11DataFileMgr16insertWithObjModEPKcRNS_7BSONObjEbb+0x4f) [0xac58df]
/usr/bin/mongod(_ZN5mongo14_updateObjectsEbPKcRKNS_7BSONObjES4_bbbRNS_7OpDebugEPNS_11RemoveSaverEbRKNS_24QueryPlanSelectionPolicyEb+0x2eda) [0xa903fa]
/usr/bin/mongod(_ZN5mongo27updateObjectsForReplicationEPKcRKNS_7BSONObjES4_bbbRNS_7OpDebugEbRKNS_24QueryPlanSelectionPolicyE+0xb7) [0xa924c7]
/usr/bin/mongod(_ZN5mongo21applyOperation_inlockERKNS_7BSONObjEbb+0xb39) [0xa72449]
/usr/bin/mongod(_ZN5mongo7replset8SyncTail9syncApplyERKNS_7BSONObjEb+0x713) [0xc273d3]
/usr/bin/mongod(_ZN5mongo7replset14multiSyncApplyERKSt6vectorINS_7BSONObjESaIS2_EEPNS0_8SyncTailE+0x48) [0xc26b18]
/usr/bin/mongod(_ZN5mongo10threadpool6Worker4loopEv+0x281) [0xdab721]
/usr/bin/mongod() [0xe26609]
/lib64/libpthread.so.0() [0x36c8607851]
/lib64/libc.so.6(clone+0x6d) [0x36c82e890d]

Fri Sep 13 07:33:20.945 Invalid access at address: 0x7fa087553e30 from thread: repl writer worker 2
Fri Sep 13 07:33:20.972 Got signal: 7 (Bus error).
Fri Sep 13 07:33:20.979 [initandlisten] connection accepted from 192.168.1.5:57728 #169 (109 connections now open)
Fri Sep 13 07:33:21.023 [rsHealthPoll] replset info A.B.C.D:27017 thinks that we are down
Fri Sep 13 07:33:20.980 Backtrace:
0xdddd81 0x6d0d29 0x6d12b2 0x36c860f500 0xa61281 0xa61a32 0xac44f3 0xac58df 0xa903fa 0xa924c7 0xa72449 0xc273d3 0xc26b18 0xdab721 0xe26609 0x36c8607851 0x36c82e890d
/usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xdddd81]
/usr/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0x6d0d29]
/usr/bin/mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x262) [0x6d12b2]
/lib64/libpthread.so.0() [0x36c860f500]
/usr/bin/mongod(ZN5mongo16NamespaceDetails10_stdAllocEib+0x641) [0xa61281]
/usr/bin/mongod(_ZN5mongo16NamespaceDetails13allocWillBeAtEPKci+0x32) [0xa61a32]
/usr/bin/mongod(_ZN5mongo11DataFileMgr6insertEPKcPKvibbbPb+0x1153) [0xac44f3]
/usr/bin/mongod(_ZN5mongo11DataFileMgr16insertWithObjModEPKcRNS_7BSONObjEbb+0x4f) [0xac58df]
/usr/bin/mongod(_ZN5mongo14_updateObjectsEbPKcRKNS_7BSONObjES4_bbbRNS_7OpDebugEPNS_11RemoveSaverEbRKNS_24QueryPlanSelectionPolicyEb+0x2eda) [0xa903fa]
/usr/bin/mongod(_ZN5mongo27updateObjectsForReplicationEPKcRKNS_7BSONObjES4_bbbRNS_7OpDebugEbRKNS_24QueryPlanSelectionPolicyE+0xb7) [0xa924c7]
/usr/bin/mongod(_ZN5mongo21applyOperation_inlockERKNS_7BSONObjEbb+0xb39) [0xa72449]
/usr/bin/mongod(_ZN5mongo7replset8SyncTail9syncApplyERKNS_7BSONObjEb+0x713) [0xc273d3]
/usr/bin/mongod(_ZN5mongo7replset14multiSyncApplyERKSt6vectorINS_7BSONObjESaIS2_EEPNS0_8SyncTailE+0x48) [0xc26b18]
/usr/bin/mongod(_ZN5mongo10threadpool6Worker4loopEv+0x281) [0xdab721]
/usr/bin/mongod() [0xe26609]
/lib64/libpthread.so.0() [0x36c8607851]
/lib64/libc.so.6(clone+0x6d) [0x36c82e890d]

DB stats:
{
"collections" : 72,
"objects" : 44619073,
"avgObjSize" : 2480.755786297936,
"dataSize" : 110689023524,
"storageSize" : 124300971392,
"numExtents" : 494,
"indexes" : 106,
"indexSize" : 5254527152,
"fileSize" : 135159349248,
"nsSizeMB" : 16,
"dataFileVersion" :

,
"ok" : 1
}