DrizzleLock segment fault

[Andrew Hutchings]

* Updated with easier way to reproduce

mysql1> flush tables with read lock;
mysql2> select * from t1 for update;

Now ctrl-c mysql2. Drizzled segfault.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffdf9a3710 (LWP 21869)]
reset (mysql_lock=0x7fffdf9a24f8) at drizzled/locking/global.cc:170
170 (*iter)->type= TL_UNLOCK;
(gdb) bt
#0 reset (mysql_lock=0x7fffdf9a24f8) at drizzled/locking/global.cc:170
#1 drizzled::reset_lock_data_and_free (mysql_lock=0x7fffdf9a24f8)
    at drizzled/locking/global.cc:161
#2 0x00000000005f87ba in drizzled::Session::lockTables (
    this=<value optimised out>, tables=0x1870348, count=<value optimised out>,
    flags=<value optimised out>, need_reopen=<value optimised out>)
    at drizzled/locking/global.cc:245
#3 0x00000000006588d7 in drizzled::Session::lock_tables (this=0x186a520,
    tables=<value optimised out>, count=<value optimised out>,
    need_reopen=0x7fffdf9a25af) at drizzled/sql_base.cc:1808
#4 0x000000000064bd74 in drizzled::Session::openTablesLock (this=0x186a520,
    tables=0x1870118) at drizzled/session.cc:1934
#5 0x00000000006717c1 in drizzled::execute_sqlcom_select (session=0x186a520,
    all_tables=0x1870118) at drizzled/sql_parse.cc:507
#6 0x0000000000673f85 in mysql_execute_command (session=0x186a520,
    inBuf=<value optimised out>, length=27) at drizzled/sql_parse.cc:480
#7 drizzled::mysql_parse (session=0x186a520, inBuf=<value optimised out>,
    length=27) at drizzled/sql_parse.cc:752
#8 0x0000000000674a80 in drizzled::dispatch_command (
    command=<value optimised out>, session=0x186a520,
    packet=<value optimised out>, packet_length=<value optimised out>)
    at drizzled/sql_parse.cc:228
#9 0x000000000064b34a in drizzled::Session::executeStatement (this=0x186a520)
    at drizzled/session.cc:710
#10 0x0000000000652347 in drizzled::Session::run (this=0x186a520)
    at drizzled/session.cc:549
#11 0x00007ffff174711e in MultiThreadScheduler::runSession (this=0x1843970,
    id=1) at plugin/multi_thread/multi_thread.cc:61
#12 0x00007ffff6b698e0 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.44.0
#13 0x00007ffff543d971 in start_thread (arg=<value optimised out>)
    at pthread_create.c:304
#14 0x00007ffff519994d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#15 0x0000000000000000 in ?? ()

[Brian Aker (brianaker)]

Doing a bisect.

[Brian Aker (brianaker)]

Crash is not found in revision 1800, but is found in 1900.