Seeing these asserts after upgrading a secondary from 2.2.3 to 2.4. Looks like it's trying to delete records on the secondary.

Thu Mar 21 09:56:26.212 [TTLMonitor] Assertion: 13312:replSet error : logOp() but not primary?
0xdcae01 0xd8c4cb 0xa66b33 0xa63df9 0xa75e64 0xc40351 0xc415b5 0xd8f0c3 0xd8fb74 0xe13709 0x3ee8407851 0x3ee80e811d
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xdcae01]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5mongo11msgassertedEiPKc+0x9b) [0xd8c4cb]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod() [0xa66b33]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5mongo5logOpEPKcS1_RKNS_7BSONObjEPS2_Pbb+0x49) [0xa63df9]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5mongo13deleteObjectsEPKcNS_7BSONObjEbbbPNS_11RemoveSaverE+0x10d4) [0xa75e64]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5mongo10TTLMonitor10doTTLForDBERKSs+0xfe1) [0xc40351]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5mongo10TTLMonitor3runEv+0x345) [0xc415b5]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5mongo13BackgroundJob7jobBodyEN5boost10shared_ptrINS0_9JobStatusEEE+0xc3) [0xd8f0c3]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod(_ZN5boost6detail11thread_dataINS_3_bi6bind_tIvNS_4_mfi3mf1IvN5mongo13BackgroundJobENS_10shared_ptrINS7_9JobStatusEEEEENS2_5list2INS2_5valueIPS7_EENSD_ISA_EEEEEEE3runEv+0x74) [0xd8fb74]
/data/dist/mongodb-linux-x86_64-2.4.0/bin/mongod() [0xe13709]
/lib64/libpthread.so.0() [0x3ee8407851]
/lib64/libc.so.6(clone+0x6d) [0x3ee80e811d]
Thu Mar 21 09:56:26.215 [TTLMonitor] ERROR: error processing ttl for db: 4d3874ade528c81a1fcdd511 13312 replSet error : logOp() but not primary?