Thor seg fault on close

hpccsystems-platform-5.4.4-rc1.x86_64

20151021x120318
http://10.241.12.204:8010/#/stub/Main-DL/Search-DL/DetailW20151021x120318-DL/Summary

Description
Work unit seg faulted

0003BB4 2015-10-21 13:11:08.947 117890 117890 "Unloading dll /opt/HPCCSystems/plugins//libdatalib.so"
00003BB5 2015-10-21 13:11:08.947 117890 117890 "Unloading dll /opt/HPCCSystems/plugins//libfileservice
s.so"
00003BB6 2015-10-21 13:11:08.947 117890 117890 "Roxiemem stats: Heap size 27008 pages, 27008 free, lar
gest block 27008"
00003BB7 2015-10-21 13:11:08.947 117890 117890 "Heap usage : 29868032 bytes"
00003BB8 2015-10-21 13:11:08.951 117890 117890 ",Progress,Thor,Stop,thor400_dev02,W20151021-120318,gra
ph27,lbentley,thor400_dev01,thor400_dev.thor"
00003BB9 2015-10-21 13:11:08.953 117890 117890 "freeMPTag: tag = 66071"
00003BBA 2015-10-21 13:11:08.953 117890 117890 "freeMPTag: tag = 66075"
00003BBB 2015-10-21 13:11:08.953 117890 117890 "freeMPTag: tag = 65544"
00003BBC 2015-10-21 13:11:08.953 117890 117890 "CMPServer::flush(65544) discarded 56 buffers"
00003BBD 2015-10-21 13:11:08.953 117890 117890 "freeMPTag: tag = 65620"
00003BBE 2015-10-21 13:11:08.953 117890 117890 "CMPServer::flush(65620) discarded 56 buffers"
00003BBF 2015-10-21 13:11:08.954 117890 117890 "================================================"
00003BC0 2015-10-21 13:11:08.954 117890 117890 "Signal: 11 Segmentation fault"
00003BC1 2015-10-21 13:11:08.954 117890 117890 "Fault IP: 00007F765352E46D"
00003BC2 2015-10-21 13:11:08.954 117890 117890 "Accessing: 00007F74874E5BF8"
00003BC3 2015-10-21 13:11:08.954 117890 117890 "Registers:"
00003BC4 2015-10-21 13:11:08.954 117890 117890 "EAX:00007F74874E5BF0 EBX:000000000100BF40 ECX:00007F
748C000028 EDX:00007F765375B388 ESI:0000000000000000 EDI:00000000010114A8"
00003BC5 2015-10-21 13:11:08.954 117890 117890 "CS:EIP:0033:00007F765352E46D"
00003BC6 2015-10-21 13:11:08.954 117890 117890 " ESP:00007FFFD881DB30 EBP:0000000000000001"
00003BC7 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DB30]: 000000000100C210 0100BF400000
0000 000000000100BF40 0000000100000000 0000000000000001 52470FC300000000 00007F7652470FC3 0100BF400000
7F76"
00003BC8 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DB50]: 000000000100BF40 0061D8200000
0000 000000000061D820 015F175800000000 00000000015F1758 0061D9C000000000 000000000061D9C0 015F16E00000
0000"
00003BC9 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DB70]: 00000000015F16E0 526D42E40000
0000 00007F76526D42E4 015F16E000007F76 00000000015F16E0 53535FFC00000000 00007F7653535FFC D881DBB00000
7F76"
00003BCA 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DB90]: 00007FFFD881DBB0 D89FF8140000
7FFF 00000000D89FF814 0061D83000000000 000000000061D830 0000000100000000 0000000000000001 0061D8880000
0000"
00003BCB 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DBB0]: 000000000061D888 0061D9300000
0000 000000000061D930 0000000100000000 0000000100000001 015F175800000001 00000000015F1758 015F4B300000
0000"
00003BCC 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DBD0]: 00000000015F4B30 01011FA00000
0000 0000000001011FA0 0101201800000000 0000000001012018 015F16E000000000 00000000015F16E0 000000000000
0000"
00003BCD 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DBF0]: 0000000000000000 00E906080000
0000 0000000000E90608 0000000000000000 0000000000000000 015F16E000000000 00000000015F16E0 000000010000
0000"
00003BCE 2015-10-21 13:11:08.954 117890 117890 "Stack[00007FFFD881DC10]: 0000000000000001 535366C40000
0000 00007F76535366C4 0000000000007F76 0000000000000000 FFFFFFFF00000000 00000000FFFFFFFF 000000010000
0000"