with mariadb-5.5.25 on a centos 5.8 machine, when i run this: ./mysql-test-run.pl --suite=rpl --force --max-test-fail=0 --nowarnings --parallel=4 mysqld crashes in the xtradb code trying to deref a NULL pointer. core files are available. Core was generated by `/home/prohaska/distros/mariadb-5.5.25-linux-x86_64/bin/mysqld --defaults-group-'. Program terminated with signal 11, Segmentation fault. #0 0x000000000095aa15 in os_aio_get_array_and_local_segment (global_seg=4, message1=0x43b910d8, message2=0x43b910d0, type=0x43b910c8, space_id=0x43b910c0) at /home/buildbot/buildbot/build/storage/xtradb/os/os0file.c:3787 3787 /home/buildbot/buildbot/build/storage/xtradb/os/os0file.c: No such file or directory. in /home/buildbot/buildbot/build/storage/xtradb/os/os0file.c (gdb) bt #0 0x000000000095aa15 in os_aio_get_array_and_local_segment (global_seg=4, message1=0x43b910d8, message2=0x43b910d0, type=0x43b910c8, space_id=0x43b910c0) at /home/buildbot/buildbot/build/storage/xtradb/os/os0file.c:3787 #1 os_aio_linux_handle (global_seg=4, message1=0x43b910d8, message2=0x43b910d0, type=0x43b910c8, space_id=0x43b910c0) at /home/buildbot/buildbot/build/storage/xtradb/os/os0file.c:4671 #2 0x00000000009114d7 in fil_aio_wait (segment=4) at /home/buildbot/buildbot/build/storage/xtradb/fil/fil0fil.c:5530 #3 0x000000000088d1ee in io_handler_thread (arg=<value optimized out>) at /home/buildbot/buildbot/build/storage/xtradb/srv/srv0start.c:483 #4 0x000000310e60677d in start_thread () from /lib64/libpthread.so.0 #5 0x000000310dad325d in clone () from /lib64/libc.so.6 (gdb) p os_aio_read_array $1 = (os_aio_array_t *) 0x0