http://bugs.winehq.org/show_bug.cgi?id=23323
--- Comment #108 from Alexandre Julliard julliard@winehq.org 2010-06-29 14:48:15 --- WoW uses opcode 0xf1 (icebp) and expects to see a single step exception, probably as a way to detect hardware debuggers. With the kernel change icebp is no longer raising a SIGTRAP since it doesn't set any dr6 bits, so WoW doesn't get its exception.