A crash with following stack trace can be noticed while running the attached mtr test (wsrep_optimize.test)

.. snip ..
#2 0x00000000007f0fd4 in handle_fatal_signal (sig=11) at maria-5.5-galera/sql/signal_handler.cc:262
#3 <signal handler called>
#4 0x00000000005ddcb1 in thd_get_ha_data (thd=0x7f7c777cb060, hton=0x7f7c7d45d260) at maria-5.5-galera/sql/sql_class.cc:626
#5 0x00000000008b2fe9 in get_trans_log (thd=0x7f7c777cb060) at maria-5.5-galera/sql/log.cc:514
#6 0x000000000077c3af in wsrep_run_wsrep_commit (thd=0x7f7c777cb060, hton=0x7f7c7d45d460, all=true) at maria-5.5-galera/sql/wsrep_hton.cc:376
#7 0x00007f7c79094d08 in ha_innodb::write_row (this=0x7f7c6f58d078, record=0x7f7c6f457e78 "\377\375\062") at maria-5.5-galera/storage/innobase/handler/ha_innodb.cc:5732
#8 0x00000000007fbfab in handler::ha_write_row (this=0x7f7c6f58d078, buf=0x7f7c6f457e78 "\377\375\062") at maria-5.5-galera/sql/handler.cc:5254
.. snip ..

Version: '5.5.34-MariaDB-wsrep-debug-log' Source distribution, wsrep_23.7.6.r3446