Are you running under z/VM? If so, use #CP TR STOR INTO <address>.<length> to trap overwriting of the area in question.
> -----Original Message----- > The first mprotect() is to allow the jump tables to be > rewritten by the > run-time linker. The second is to protect the text segment > so that nobody > overwrites the pointer tables. Well, the pages are not protected, and > somebody is overwriting the page under some very rare set of > circumstances > under select(), but I can't see who is doing it. Using hardware > watchpoints under gdb does not reveal the offending instruction, the > watchpoint was not caught. This is a bit of a mystery, as hardware > watchpoints do work under gdb on 390, but the attempt to > watch a particular > address within the jump table did not result in any trap when > the value > changed.
