encryption.create_or_replace hangs during DROP TABLE

2017-04-07  0:57:25 140222316631808 [ERROR] [FATAL] InnoDB: Semaphore wait has lasted > 600 seconds. We intentionally crash the server because it appears to be hung.

2017-04-07 00:57:25 0x7f880d5f5700  InnoDB: Assertion failure in file /source/storage/innobase/ut/ut0ut.cc line 844

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Core was generated by `/build/build/sql/mysqld --defaults-group-suffix=.1 --defaults-file=/build/build'.

Program terminated with signal SIGABRT, Aborted.

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:62

62      ../sysdeps/unix/sysv/linux/pthread_kill.c: No such file or directory.

[Current thread is 1 (Thread 0x7f880d5f5700 (LWP 23328))]

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:62

#1  0x000055685118295a in my_write_core (sig=sig@entry=6) at /source/mysys/stacktrace.c:477

#2  0x0000556850c16464 in handle_fatal_signal (sig=6) at /source/sql/signal_handler.cc:299

#3  <signal handler called>

#4  0x00007f881c1a0428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54

#5  0x00007f881c1a202a in __GI_abort () at abort.c:89

#6  0x00005568509e28ed in ut_dbg_assertion_failed (expr=expr@entry=0x0, file=file@entry=0x5568512b1f70 "/source/storage/innobase/ut/ut0ut.cc", line=line@entry=844) at /source/storage/innobase/ut/ut0dbg.cc:60

#7  0x0000556850f03471 in ib::fatal::~fatal (this=0x7f880d5f4be0, __in_chrg=<optimized out>) at /source/storage/innobase/ut/ut0ut.cc:844

#8  0x0000556850ea7f95 in srv_error_monitor_thread () at /source/storage/innobase/srv/srv0srv.cc:1956

#9  0x00007f881cde36ba in start_thread (arg=0x7f880d5f5700) at pthread_create.c:333

#10 0x00007f881c27182d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109