Do not use MySQL 5.1.31 or newer with Bugzilla 3.2 – 3.2.2
As described in bug 480001, MySQL 5.1.31 and newer no longer let you write ‘SET SESSION max_allowed_packet = xxxx’ (this variable is now read-only, unless set globally). As we are calling it from two different places in Bugzilla 3.2, 3.2.1 and 3.2.2, those versions won’t work together. I hope this problem will be fixed in Bugzilla 3.2.3.
Update: this bug has been fixed and will be available in Bugzilla 3.2.3, which should be released very soon now (probably next week).