SIGABRT in myclone::Client::uninit_pfs

#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=139922541356608) at ./nptl/pthread_kill.c:44

#1  __pthread_kill_internal (signo=6, threadid=139922541356608) at ./nptl/pthread_kill.c:78

#2  __GI___pthread_kill (threadid=139922541356608, signo=signo@entry=6) at ./nptl/pthread_kill.c:89

#3  __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26

#4  __GI_abort () at ./stdlib/abort.c:79

#5  safe_mutex_destroy (mp=<myclone::Client::s_table_mutex>, file=<optimized out>, line=<optimized out>) at /data/Server/MDEV-36733/mysys/thr_mutex.c:597

#6  inline_mysql_mutex_destroy (src_line=712, src_file="/data/Server/MDEV-36733/plugin/clone/src/clone_client.cc", that=<optimized out>)

    at /data/Server/MDEV-36733/include/mysql/psi/mysql_thread.h:724

#7  myclone::Client::uninit_pfs () at /data/Server/MDEV-36733/plugin/clone/src/clone_client.cc:712

#8  myclone::Table_pfs::drop_proxy_tables () at /data/Server/MDEV-36733/plugin/clone/src/clone_status.cc:139

#9  myclone::Table_pfs::release_services () at /data/Server/MDEV-36733/plugin/clone/src/clone_status.cc:225

#10 plugin_clone_deinit (plugin_info=<optimized out>) at /data/Server/MDEV-36733/plugin/clone/src/clone_plugin.cc:408

#11 plugin_deinitialize (plugin=, ref_check=ref_check@entry=true) at /data/Server/MDEV-36733/sql/sql_plugin.cc:1279

#12 reap_plugins () at /data/Server/MDEV-36733/sql/sql_plugin.cc:1350

#13 mysql_uninstall_plugin (thd=thd@entry=, name=<optimized out>, dl_arg=<optimized out>) at /data/Server/MDEV-36733/sql/sql_plugin.cc:2494

#14 mysql_execute_command (thd=thd@entry=, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /data/Server/MDEV-36733/sql/sql_parse.cc:5790

#15 mysql_parse (thd=thd@entry=, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=) at /data/Server/MDEV-36733/sql/sql_parse.cc:7914

#16 dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=, packet=packet@entry="UNINSTALL PLUGIN IF EXISTS clone /* E_R Thread6 QNO 2774 CON_ID 23 */ ", 

    packet_length=packet_length@entry=70, blocking=blocking@entry=true) at /data/Server/MDEV-36733/sql/sql_parse.cc:1896

#17 do_command (thd=thd@entry=, blocking=blocking@entry=true) at /data/Server/MDEV-36733/sql/sql_parse.cc:1419

#18 do_handle_one_connection (connect=<optimized out>, connect@entry=, put_in_cache=put_in_cache@entry=true) at /data/Server/MDEV-36733/sql/sql_connect.cc:1414

#19 handle_one_connection (arg=) at /data/Server/MDEV-36733/sql/sql_connect.cc:1326

#20 start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#21 clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:100