[Draft] Assertion `strchr(path, '/') != __null' failed in fil_op_write_log and SIGSEGV

190202  8:36:34 [ERROR] mysqld got signal 11 ;

...

mysqld: /home/travis/src/storage/innobase/fil/fil0fil.cc:2026: void fil_op_write_log(mlog_id_t, ulint, ulint, const char*, const char*, ulint, mtr_t*): Assertion `strchr(path, '/') != __null' failed.

Fatal signal 6 while backtracing

Aborted (core dumped)

...

#3  0x00007f7cf3848c82 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#4  0x000055b129341725 in fil_op_write_log (type=MLOG_FILE_NAME, space_id=98, first_page_no=0, path=0x7f7c98129fe0 "", new_path=0x0, flags=0, mtr=0x7f7cc2ffc900) at /home/travis/src/storage/innobase/fil/fil0fil.cc:2026

#5  0x000055b129341b9a in fil_name_write (space_id=98, first_page_no=0, name=0x7f7c98129fe0 "", mtr=0x7f7cc2ffc900) at /home/travis/src/storage/innobase/fil/fil0fil.cc:2133

#6  0x000055b129341bd8 in fil_name_write (space=0x7f7c9808c990, first_page_no=0, file=0x7f7c98078a20, mtr=0x7f7cc2ffc900) at /home/travis/src/storage/innobase/fil/fil0fil.cc:2148

#7  0x000055b12934a999 in fil_names_write (space=0x7f7c9808c990, mtr=0x7f7cc2ffc900) at /home/travis/src/storage/innobase/fil/fil0fil.cc:4852

#8  0x000055b12934ae3e in fil_names_clear (lsn=1321120, do_write=true) at /home/travis/src/storage/innobase/fil/fil0fil.cc:4948

#9  0x000055b1290c4f2a in log_checkpoint (sync=true, write_always=false) at /home/travis/src/storage/innobase/log/log0log.cc:1487

#10 0x000055b1291e57ad in srv_master_do_idle_tasks () at /home/travis/src/storage/innobase/srv/srv0srv.cc:2258

#11 0x000055b1291e5b9b in srv_master_thread (arg=0x0) at /home/travis/src/storage/innobase/srv/srv0srv.cc:2360

#12 0x00007f7cf46916ba in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0

#13 0x00007f7cf392241d in clone () from /lib/x86_64-linux-gnu/libc.so.6

perl ./runall-new.pl --basedir=/home/travis/server --vardir=/home/travis/logs/vardir --duration=350 --threads=6 --seed=1549096453 --reporters=Backtrace,ErrorLog,Deadlock --validators=TransformerNoComparator --views --redefine=conf/mariadb/alter_table.yy --redefine=conf/mariadb/instant_add.yy --redefine=conf/mariadb/modules/alter_table_columns.yy --redefine=conf/mariadb/sp.yy --redefine=conf/mariadb/bulk_insert.yy --redefine=conf/mariadb/modules/admin.yy --redefine=conf/mariadb/modules/userstat.yy --redefine=conf/mariadb/modules/foreign_keys.yy -redefine=conf/mariadb/modules/locks.yy --redefine=conf/mariadb/modules/sql_mode.yy --redefine=conf/mariadb/versioning.yy --redefine=conf/mariadb/sequences.yy --redefine=conf/mariadb/modules/locks-10.4-extra.yy --mysqld=--log_output=FILE --mysqld=--max-statement-time=30 --mysqld=--lock-wait-timeout=10 --mysqld=--loose-innodb-lock-wait-timeout=5 --mysqld=--loose-debug_assert_on_not_freed_memory=0 --grammar=conf/runtime/WL5004_sql.yy --gendata=conf/runtime/WL5004_data.zz --ps-protocol --transformers=ExecuteAsIntersect,ExecuteAsExcept,ExecuteAsCTE,ExecuteAsExecuteImmediate,ExecuteAsDeleteReturning,ExecuteAsInsertSelect,ExecuteAsUnion,ExecuteAsUpdateDelete,ExecuteAsView --filter=/home/travis/mariadb-toolbox/travis/10.4-combo-filter.ff