Created by: wangguibao

Running output/bin/db_func, output/bin/db_thread will occasionally coredump:

[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from KVDBTest
[ RUN      ] KVDBTest.AbstractKVDB_Func_Test
[       OK ] KVDBTest.AbstractKVDB_Func_Test (16 ms)
[----------] 1 test from KVDBTest (16 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (16 ms total)
[  PASSED  ] 1 test.
pure virtual method called
terminate called without an active exception
Aborted (core dumped)