Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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5.5, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6
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None
Description
Side effects may vary, but I guess crash is most probable outcome.
To reproduce, first apply this patch:
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
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index e1c9f68..028db04 100644
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--- a/sql/mysqld.cc
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+++ b/sql/mysqld.cc
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@@ -2045,11 +2045,13 @@ static void mysqld_exit(int exit_code)
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#ifdef SAFEMALLOC
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sf_report_leaked_memory(0);
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#endif
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- DBUG_SLOW_ASSERT(global_status_var.global_memory_used == 0);
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+// DBUG_SLOW_ASSERT(global_status_var.global_memory_used == 0);
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}
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cleanup_tls();
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DBUG_LEAVE;
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sd_notify(0, "STATUS=MariaDB server is down");
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+ if (delayed_queue_size == 10)
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+ sleep(10);
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exit(exit_code); /* purecov: inspected */
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}
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diff --git a/sql/sql_connect.cc b/sql/sql_connect.cc
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index a2f2407..373f9c6 100644
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--- a/sql/sql_connect.cc
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+++ b/sql/sql_connect.cc
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@@ -1303,6 +1303,9 @@ pthread_handler_t handle_one_connection(void *arg)
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{
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CONNECT *connect= (CONNECT*) arg;
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+ if (delayed_queue_size == 10)
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+ sleep(10);
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+
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mysql_thread_set_psi_id(connect->thread_id);
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do_handle_one_connection(connect);
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Note: delayed_queue_size variable was chosen randomly and doesn't make any difference, it is there just to avoid sleeping in unrelated connections.
Test:
set global delayed_queue_size=10;
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connect(con1,localhost,root,,);
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run mtr and as soon as it shows "set global delayed_queue_size=10;" kill mysqld manually, like killall mysqld.
You should end up with crash like like:
Thread 2 (Thread 0x7fb03f8678c0 (LWP 16008)):
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#0 0x00007fb03d2da30d in nanosleep () at ../sysdeps/unix/syscall-template.S:84
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#1 0x00007fb03d2da25a in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
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#2 0x0000559aa846aa4d in mysqld_exit (exit_code=0) at /home/svoj/devel/maria/mariadb/sql/mysqld.cc:2054
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#3 0x0000559aa847308f in mysqld_main (argc=155, argv=0x559aaabc1a20) at /home/svoj/devel/maria/mariadb/sql/mysqld.cc:6034
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#4 0x0000559aa8466ee0 in main (argc=32, argv=0x7ffc504365a8) at /home/svoj/devel/maria/mariadb/sql/main.cc:25
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Thread 1 (Thread 0x7fb0354c8700 (LWP 16040)):
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#0 __pthread_kill (threadid=<optimized out>, signo=11) at ../sysdeps/unix/sysv/linux/pthread_kill.c:62
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#1 0x0000559aa9071112 in my_write_core (sig=11) at /home/svoj/devel/maria/mariadb/mysys/stacktrace.c:481
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#2 0x0000559aa88a92f1 in handle_fatal_signal (sig=11) at /home/svoj/devel/maria/mariadb/sql/signal_handler.cc:305
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#3 <signal handler called>
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#4 0x0000559aa8ae5813 in set_thread_id_v1 (thread=0x7fb03a8be340, processlist_id=10) at /home/svoj/devel/maria/mariadb/storage/perfschema/pfs.cc:1945
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#5 0x0000559aa86fa923 in inline_mysql_thread_set_psi_id (id=10) at /home/svoj/devel/maria/mariadb/include/mysql/psi/mysql_thread.h:1275
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#6 0x0000559aa86fdb1d in handle_one_connection (arg=0x559aab131c90) at /home/svoj/devel/maria/mariadb/sql/sql_connect.cc:1309
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#7 0x0000559aa8ae55d0 in pfs_spawn_thread (arg=0x559aab0acd30) at /home/svoj/devel/maria/mariadb/storage/perfschema/pfs.cc:1862
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#8 0x00007fb03de806ba in start_thread (arg=0x7fb0354c8700) at pthread_create.c:333
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#9 0x00007fb03d31541d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
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Most probably regression after connection speed improvements. And likely affects 10.0+.
Attachments
Issue Links
- causes
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- Closed
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