Version: '5.5.23-MariaDB-debug-log'  
mysqld: sql/log.cc:8022: void MYSQL_BIN_LOG::mark_xid_done(ulong): Assertion `b' failed.

#6  0x00007fb9084c7d4d in __GI___assert_fail (assertion=0xdc3493 "b", file=<optimized out>, line=8022, function=<optimized out>)
    at assert.c:81
#7  0x000000000088e8c9 in MYSQL_BIN_LOG::mark_xid_done (this=0x14f8b40, cookie=26) at sql/log.cc:8022
#8  0x00000000008883ea in MYSQL_BIN_LOG::do_checkpoint_request (this=0x14f8b40, binlog_id=26) at sql/log.cc:5554
#9  0x0000000000888729 in MYSQL_BIN_LOG::checkpoint_and_purge (this=0x14f8b40, binlog_id=26) at sql/log.cc:5676
#10 0x00000000008887fd in MYSQL_BIN_LOG::rotate_and_purge (this=0x14f8b40, force_rotate=true) at sql/log.cc:5708
#11 0x0000000000735e30 in reload_acl_and_cache (thd=0x41e2d50, options=16130, tables=0x0, write_to_binlog=0x7fb909b6c0c0)
    at sql/sql_reload.cc:152
#12 0x0000000000610687 in mysql_execute_command (thd=0x41e2d50) at sql/sql_parse.cc:3664
#13 0x0000000000615deb in mysql_parse (thd=0x41e2d50, rawbuf=0x41f83c8 "FLUSH LOGS", length=10, parser_state=0x7fb909b6c550)
    at sql/sql_parse.cc:5731
#14 0x000000000060968f in dispatch_command (command=COM_QUERY, thd=0x41e2d50, packet=0x41fa771 "FLUSH LOGS", packet_length=10)
    at sql/sql_parse.cc:1055
#15 0x0000000000608946 in do_command (thd=0x41e2d50) at sql/sql_parse.cc:794
#16 0x0000000000709007 in do_handle_one_connection (thd_arg=0x41e2d50) at sql/sql_connect.cc:1253
#17 0x00000000007089f2 in handle_one_connection (arg=0x41e2d50) at sql/sql_connect.cc:1168
#18 0x00007fb909209efc in start_thread (arg=0x7fb909b6d700) at pthread_create.c:304
#19 0x00007fb90857c59d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

Query (0x41f83c8): FLUSH LOGS
Connection ID (thread ID): 12
Status: NOT_KILLED

revision-id: knielsen@knielsen-hq.org-20120613132210-vwxe0ejooug9a0bl
date: 2012-06-13 15:22:10 +0200
build-date: 2012-06-15 21:44:34 +0400
revno: 3382

- start mysqld with --log-bin=master-bin, other parameters may remain default;
- run:
mysqlslap --query="FLUSH LOGS" --concurrency=2 --iterations=100000 --protocol=tcp --port=8306 -uroot --create-schema=test