[MDEV-20183] data race at safe_mutex_lock() Created: 2019-07-26  Updated: 2019-07-26  Resolved: 2019-07-26

Status: Closed
Project: MariaDB Server
Component/s: Server
Affects Version/s: 5.5, 10.1, 10.2, 10.3, 10.4
Fix Version/s: 10.3.17, 10.4.7

Type: Bug Priority: Major
Reporter: Eugene Kosov (Inactive) Assignee: Eugene Kosov (Inactive)
Resolution: Fixed Votes: 0
Labels: None


 Description    

WARNING: ThreadSanitizer: data race (pid=27180)
 
  Read of size 8 at 0x000004011f90 by thread T17:
 
    #0 safe_mutex_lock build/../mysys/thr_mutex.c:240:12 (mysqld+0x2206cc3)
 
    #1 inline_mysql_mutex_lock build/../include/mysql/psi/mysql_thread.h:710:11 (mysqld+0x21f4b44)
 
    #2 my_thread_init build/../mysys/my_thr_init.c:307:3 (mysqld+0x21f4628)
 
    #3 fts_optimize_thread(void*) build/../storage/innobase/fts/fts0opt.cc:2799:2 (mysqld+0x1cb9073)
 
 
 
  Previous write of size 8 at 0x000004011f90 by thread T16 (mutexes: write M862, write M861):
 
    #0 safe_mutex_lock build/../mysys/thr_mutex.c:310:11 (mysqld+0x22071d0)
 
    #1 inline_mysql_mutex_lock build/../include/mysql/psi/mysql_thread.h:710:11 (mysqld+0x21f4b44)
 
    #2 my_thread_init build/../mysys/my_thr_init.c:307:3 (mysqld+0x21f4628)
 
    #3 dict_stats_thread build/../storage/innobase/dict/dict0stats_bg.cc:459:2 (mysqld+0x1c050b4)

mp->file is read without mutex protection. It should be protected by safe_mutex_t::global
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