unit.ma_test_loghandler failed in buildbot

unit.ma_test_loghandler_multithread      w1 [ fail ]

        Test ended at 2016-08-03 03:47:47

CURRENT_TEST: unit.ma_test_loghandler_multithread

1..30

ok 1 - write records

ok 2 - write records

ok 3 - write records

ok 4 - write records

ok 5 - write records

ok 6 - write records

ok 7 - write records

ok 8 - writer finished

ok 9 - write records

ok 10 - writer finished

ok 11 - write records

ok 12 - writer finished

ok 13 - record read

ok 14 - record read

ok 15 - record read

ok 16 - record read

ok 17 - record read

ok 18 - record read

ok 19 - record read

ok 20 - record read

ok 21 - record read

ok 22 - record read

ok 23 - record read

ok 24 - record read

ok 25 - record read

ok 26 - record read

ok 27 - record read

ok 28 - record read

Byte # 16288365 is 65 instead of 6dIncorrect LOGREC_VARIABLE_RECORD_0LSN_EXAMPLE in whole rec read lsn(1,0x7f28007)

not ok 29 - record read

# 30 tests planned but only 29 executed

Warning: 2048 bytes lost, allocated at mysys/array.c:64, mysys/hash.c:94, mysys/thr_mutex.c:178, unittest/ma_test_loghandler_multithread-t.c:391, 0x7f9c06411ec5, 0x404b46

Warning: 2048 bytes lost, allocated at mysys/array.c:64, mysys/hash.c:94, mysys/thr_mutex.c:178, unittest/ma_test_loghandler_multithread-t.c:391, 0x7f9c06411ec5, 0x404b46

Warning:  176 bytes lost, allocated at mysys/mulalloc.c:51, mysys/thr_mutex.c:160, unittest/ma_test_loghandler_multithread-t.c:391, 0x7f9c06411ec5, 0x404b46

Warning: 2048 bytes lost, allocated at mysys/array.c:64, mysys/hash.c:94, mysys/thr_mutex.c:178, psi/mysql_thread.h:618, bits/string3.h:51, unittest/ma_test_loghandler_multithread-t.c:339, 0x7f9c06411ec5, 0x404b46

Warning: 2048 bytes lost, allocated at mysys/array.c:64, mysys/hash.c:94, mysys/thr_mutex.c:178, psi/mysql_thread.h:618, bits/string3.h:51, unittest/ma_test_loghandler_multithread-t.c:339, 0x7f9c06411ec5, 0x404b46

Warning:  176 bytes lost, allocated at mysys/mulalloc.c:51, mysys/thr_mutex.c:160, psi/mysql_thread.h:618, bits/string3.h:51, unittest/ma_test_loghandler_multithread-t.c:339, 0x7f9c06411ec5, 0x404b46

Memory lost: 8544 bytes in 6 chunks