fix duplicating&learning(6/n): unknown core dump when loop restart

[foreverneverer]

Bug Report

#0  remove_all_duplications (this=<optimized out>) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/replica/duplication/replica_duplicator_manager.h:79
#1  update_duplication_map (new_dup_map=..., this=<optimized out>) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/replica/duplication/replica_duplicator_manager.h:32
#2  dsn::replication::duplication_sync_timer::update_duplication_map (this=this@entry=0x1225e5200, dup_map=...) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/replica/duplication/duplication_sync_timer.cpp:86
#3  0x00007fbba15a02db in dsn::replication::duplication_sync_timer::on_duplication_sync_reply (this=0x1225e5200, err=..., resp=...) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/replica/duplication/duplication_sync_timer.cpp:72
#4  0x00007fbba15a03b2 in operator() (err=..., __closure=0x2c4ca8ba0) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/replica/duplication/duplication_sync_timer.cpp:59
#5  operator() (req=<optimized out>, resp=<optimized out>, err=..., __closure=0x2c4ca8ba0) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/include/dsn/cpp/rpc_holder.h:164
#6  std::_Function_handler<void(dsn::error_code, dsn::message_ex*, dsn::message_ex*), dsn::rpc_holder<TRequest, TResponse>::call(const dsn::rpc_address&, dsn::task_tracker*, TCallback&&, int) [with TCallback = dsn::replication::duplication_sync_timer::run()::<lambda(dsn::error_code)>; TRequest = dsn::replication::duplication_sync_request; TResponse = dsn::replication::duplication_sync_response; dsn::task_ptr = dsn::ref_ptr<dsn::task>]::<lambda(dsn::error_code, dsn::message_ex*, dsn::message_ex*)> >::_M_invoke(const std::_Any_data &, <unknown type in /home/work/app/pegasus/c4tst-tune/replica/package/bin/libdsn_replica_server.so, CU 0x23624f8, DIE 0x24c32d9>, <unknown type in /home/work/app/pegasus/c4tst-tune/replica/package/bin/libdsn_replica_server.so, CU 0x23624f8, DIE 0x24c32de>, <unknown type in /home/work/app/pegasus/c4tst-tune/replica/package/bin/libdsn_replica_server.so, CU 0x23624f8, DIE 0x24c32e3>) (__functor=..., __args#0=<optimized out>, __args#1=<optimized out>, __args#2=<optimized out>)
    at /home/jiashuo1/app/toolchain/gcc540/output/include/c++/5.4.0/functional:1871
#7  0x00007fbba175a417 in operator() (__args#2=0x379ff0f20, __args#1=0x82eca580, __args#0=..., this=<optimized out>) at /home/jiashuo1/app/toolchain/gcc540/output/include/c++/5.4.0/functional:2267
#8  dsn::rpc_response_task::exec (this=<optimized out>) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/include/dsn/tool-api/task.h:477
#9  0x00007fbba175db61 in dsn::task::exec_internal (this=this@entry=0x217605f00) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/runtime/task/task.cpp:176
#10 0x00007fbba177811a in dsn::task_worker::loop (this=0x1e4b2c0) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/runtime/task/task_worker.cpp:211
#11 0x00007fbba177831d in dsn::task_worker::run_internal (this=0x1e4b2c0) at /home/jiashuo1/work/pegasus-2.2/pegasus/rdsn/src/runtime/task/task_worker.cpp:191
#12 0x00007fbb9dd30fd0 in std::execute_native_thread_routine (__p=<optimized out>) at /home/jiashuo1/app/toolchain/gcc540/objdir/../gcc-5.4.0/libstdc++-v3/src/c++11/thread.cc:84
#13 0x0000003dc0807851 in start_thread () from /lib64/libpthread.so.0
#14 0x0000003dc04e811d in clone () from /lib64/libc.so.6

code url: https://github.com/Shuo-Jia/rdsn/blob/v2.2.1-mi-beta1/src/replica/duplication/replica_duplicator_manager.h#L79