Core dumps in XDCR test cases with build 1924

Failure with build 1924 -http://qa.hq.northscale.net/job/cen006-p0-xxdcr-vset09-00-goxdcr-pause-resume/177/consoleFull
TC: test_14
./testrunner -i INI_FILE.ini get-cbcollect-info=True,get-logs=False,stop-on-failure=False,get-coredumps=True,fail_on_errors=1,GROUP=P0 -t xdcr.pauseResumeXDCR.PauseResumeTest.replication_with_pause_and_resume,reboot=dest_node,items=5000,rdirection=unidirection,replication_type=xmem,standard_buckets=1,sasl_buckets=1,pause=C1,update=C1,delete=C1,GROUP=P0
log: https://s3.amazonaws.com/bugdb/jira/MB-18779/log_test_14_1924.tar
TC: test_15
./testrunner -i INI_FILE.ini get-cbcollect-info=True,get-logs=False,stop-on-failure=False,get-coredumps=True,fail_on_errors=1,GROUP=P0 -t xdcr.pauseResumeXDCR.PauseResumeTest.replication_with_pause_and_resume,reboot=dest_cluster,items=5000,rdirection=bidirection,replication_type=xmem,standard_buckets=1,sasl_buckets=1,pause=C1-C2,update=C1-C2,delete=C1-C2,GROUP=P0;xmim
log:https://s3.amazonaws.com/bugdb/jira/MB-18779/log_test_15_1924.tar
TC:Test_16
./testrunner -i INI_FILE.ini get-cbcollect-info=True,get-logs=False,stop-on-failure=False,get-coredumps=True,fail_on_errors=1,GROUP=P0 -t xdcr.pauseResumeXDCR.PauseResumeTest.replication_with_pause_and_resume,reboot=dest_cluster,items=5000,rdirection=unidirection,standard_buckets=1,sasl_buckets=1,pause=C1,update=C1,delete=C1,GROUP=P0
logs: https://s3.amazonaws.com/bugdb/jira/MB-18779/log_test_16_1924.tar