Comment 2 for bug 1511969

Another occurrence:

2016-01-26T12:54:37.444140Z 0 [Note] InnoDB: Buffer pool(s) load completed at 160126 23:54:37
/git/PS-5.7_dbg/storage/tokudb/PerconaFT/src/ydb.cc:979 env_open: Assertion `r == 0' failed (errno=2) (r=18446744073709451616)
: No such file or directory
Backtrace: (Note: toku_do_assert=0x0x7ff370d5f0f6)

+bt
#0 0x00007ff43ddb1741 in __pthread_kill (threadid=<optimized out>, signo=6) at ../nptl/sysdeps/unix/sysv/linux/pthread_kill.c:61
#1 0x0000000001811920 in my_write_core (sig=6) at /git/PS-5.7_dbg/mysys/stacktrace.c:247
#2 0x0000000000e609e3 in handle_fatal_signal (sig=6) at /git/PS-5.7_dbg/sql/signal_handler.cc:223
#3 <signal handler called>
#4 0x00007ff43c14a5f7 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#5 0x00007ff43c14bce8 in __GI_abort () at abort.c:90
#6 0x00007ff370d5ee6f in toku_do_backtrace_abort () at /git/PS-5.7_dbg/storage/tokudb/PerconaFT/portability/toku_assert.cc:147
#7 0x00007ff370d5f028 in toku_do_assert_zero_fail (expr=18446744073709451616, expr_as_string=0x7ff370d67c24 "r", function=0x7ff370d69b96 <env_open(__toku_db_env*, char const*, unsigned int, int)::__FUNCTION__> "env_open", file=0x7ff370d67fd0 "/git/PS-5.7_dbg/storage/tokudb/PerconaFT/src/ydb.cc", line=979, caller_errno=2) at /git/PS-5.7_dbg/storage/tokudb/PerconaFT/portability/toku_assert.cc:177
#8 0x00007ff370c60e65 in env_open (env=0x7ff38a31b200, home=0x2bfa300 <mysql_real_data_home> "/sda/PS-19.01.16-mysql-5.7.10-1rc1-linux-x86_64-debug/data/", flags=11403457, mode=438) at /git/PS-5.7_dbg/storage/tokudb/PerconaFT/src/ydb.cc:979
#9 0x00007ff370c4e4ea in tokudb_init_func (p=0x7ff4377fa120) at /git/PS-5.7_dbg/storage/tokudb/hatoku_hton.cc:553
#10 0x0000000000eeb963 in ha_initialize_handlerton (plugin=0x7ff38a361528) at /git/PS-5.7_dbg/sql/handler.cc:870
#11 0x0000000001534d2e in plugin_initialize (plugin=0x7ff38a361528) at /git/PS-5.7_dbg/sql/sql_plugin.cc:1178
#12 0x00000000015358ea in plugin_init (argc=0x2bff4b0 <remaining_argc>, argv=0x7ff43a022300, flags=0) at /git/PS-5.7_dbg/sql/sql_plugin.cc:1490
#13 0x0000000000e4fa53 in init_server_components () at /git/PS-5.7_dbg/sql/mysqld.cc:4221
#14 0x0000000000e51012 in mysqld_main (argc=12, argv=0x7ff43a022300) at /git/PS-5.7_dbg/sql/mysqld.cc:4897
#15 0x0000000000e48600 in main (argc=12, argv=0x7fff6fb656a8) at /git/PS-5.7_dbg/sql/main.cc:25