I've recently upgraded from mariadb 5.5.29 to 5.5.33a on many servers. There are no problem except one server (out of ~15) that keeps crashing (every 5-20 minutes). I've tested on oracle mysql 5.5.34 (with same server) and it does not crash with it. It is server provided to hosting users with about 75GB od data on innodb and myisam. Also server stopps crashing when I switch back to mariadb 5.5.29. I use precompiled binaries of mariadb but I also compiled 5.5.33a on my system and same issue was occuring there.
Now i compared that "Connection ID (thread ID): 2250" with general query log and server crashes always after this sequence of queries: