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  1. MariaDB Server
  2. MDEV-15670

unit.my_atomic failed in buildbot with Signal 11 thrown

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    Description

      http://buildbot.askmonty.org/buildbot/builders/kvm-fulltest/builds/12607

      unit.my_atomic                           w4 [ fail ]
      		 
              Test ended at 2018-03-26 03:43:54
      		 
       
      		 
      CURRENT_TEST: unit.my_atomic
      		 
      # N CPUs: 4, atomic ops: gcc-atomics-smp
      		 
      1..6
      		 
      ok 1 - my_atomic_initialize() returned 0
      		 
      # Testing my_atomic_add32 with 30 threads, 3000 iterations... 
      Bail out! Signal 11 thrown
      		 
      # 6 tests planned,  0 failed,  1 was last executed
      		 
       
      		 
       
      		 
      mysqltest failed with unexpected return code 255

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          Bug - A problem which impairs or prevents the functions of the product. MDEV-12897 unit.lf failed in buildbot

          • Major - Major loss of function.
          • Closed

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            svoj Sergey Vojtovich added a comment -

            Reproducible with: while [ $? -eq 0 ]; do ../unittest/mysys/my_atomic-t; done

            svoj Sergey Vojtovich added a comment - Reproducible with: while [ $? -eq 0 ]; do ../unittest/mysys/my_atomic-t; done
            svoj Sergey Vojtovich added a comment - - edited

            What I observe looks like a glibc bug. For me (ubuntu xenial) it crashes as following:

            #0  0x00007fd1becd430d in nanosleep () at ../sysdeps/unix/syscall-template.S:84
            		 
            #1  0x00007fd1becd425a in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
            		 
            #2  0x0000560fa9bd5e2c in handle_core_signal (signo=11) at /home/svoj/devel/maria/mariadb/unittest/mytap/tap.c:134
            		 
            #3  <signal handler called>
            		 
            #4  __pthread_create_2_1 (newthread=<optimized out>, attr=<optimized out>, start_routine=<optimized out>, arg=<optimized out>) at pthread_create.c:713
            		 
            #5  0x0000560fa9bd5603 in test_concurrently (test=0x560fa9c29949 "my_atomic_add64", handler=0x560fa9bd58ab <test_atomic_add64>, n=3, m=3000) at /home/svoj/devel/maria/mariadb/unittest/mysys/thr_template.c:40
            		 
            #6  0x0000560fa9bd5cd4 in do_tests () at /home/svoj/devel/maria/mariadb/unittest/mysys/my_atomic-t.c:144
            		 
            #7  0x0000560fa9bd57ae in main (argc=1, argv=0x7ffc289d02a8) at /home/svoj/devel/maria/mariadb/unittest/mysys/thr_template.c:72

            The solution is to upgrade builders. A workaround is to make threads joinable (which will make code better anyway).

            For details see https://bugs.mysql.com/bug.php?id=82886

            svoj Sergey Vojtovich added a comment - - edited What I observe looks like a glibc bug. For me (ubuntu xenial) it crashes as following: #0 0x00007fd1becd430d in nanosleep () at ../sysdeps/unix/syscall-template.S:84 #1 0x00007fd1becd425a in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55 #2 0x0000560fa9bd5e2c in handle_core_signal (signo=11) at /home/svoj/devel/maria/mariadb/unittest/mytap/tap.c:134 #3 <signal handler called> #4 __pthread_create_2_1 (newthread=<optimized out>, attr=<optimized out>, start_routine=<optimized out>, arg=<optimized out>) at pthread_create.c:713 #5 0x0000560fa9bd5603 in test_concurrently (test=0x560fa9c29949 "my_atomic_add64", handler=0x560fa9bd58ab <test_atomic_add64>, n=3, m=3000) at /home/svoj/devel/maria/mariadb/unittest/mysys/thr_template.c:40 #6 0x0000560fa9bd5cd4 in do_tests () at /home/svoj/devel/maria/mariadb/unittest/mysys/my_atomic-t.c:144 #7 0x0000560fa9bd57ae in main (argc=1, argv=0x7ffc289d02a8) at /home/svoj/devel/maria/mariadb/unittest/mysys/thr_template.c:72 The solution is to upgrade builders. A workaround is to make threads joinable (which will make code better anyway). For details see https://bugs.mysql.com/bug.php?id=82886

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              svoj Sergey Vojtovich
              elenst Elena Stepanova
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