Help/Support Reverse engineering/tracing a store app with lots of custom code?

infernusdoleo · December 15, 2015

When you say it will crash my app, do you mean it will crash, or hang?

I'm having a really weird issue now.

Using GDB, got it running. What I'm watching is an 8 byte/64 bit integer. If I do this:

watch *(double *)0x12345678

It never actually catches it. Ever. I know the value is changing, I'm changing it in-app.

So then I ^C and leaving the original watchpoint in, I add:

watch (double *)0x12345678 (notice the lack of the initial *)

I then hit C to continue.

It immediately breaks telling me the value of watchpoint ONE (not the new one) changed.

If I hit continue again, the app freezes and becomes completely unresponsive. If I ^C and delete watchpoint 2, then continue, the app continues to work, and watchpoint 1 stops reporting. If I ^C and re-add the 2nd watchpoint, again, it will immediately break (if the value changed in the meantime) reporting the change (saying it was watchpoint 1 that caught it). Another continue brings us back to hanging.

Really weird.

Any clue? Or should I just go get a cheap macbook today?

Updated December 15, 2015 by infernusdoleo