gdb reverse debugging fails with “Process record does not support instruction 0xf0d at address”

Question

i started to try reverse debugging with gdb 7, followin the tutorial:

http://www.sourceware.org/gdb/wiki/ProcessRecord/Tutorial

and I thoug

Answer 1

Sounds like precord is still buggy.

Please make sure you are using the latest released GDB 7.1, and file a bug. Output from x/i 0x2aaaab4c4b4e will likely be helpful. So will be exact distribution and versions of GCC and libc.so.6

Answer 2

AVX is not supported as of GDB 7.11.1

Maybe this is the same problem as mentioned at:

• gdb reverse debugging avx2
• https://sourceware.org/ml/gdb/2016-08/msg00028.html

since your trace mentions memcpy, which uses AVX instructions in Ubuntu 16.04, but it is hard to be sure without a minimal example.

rr is an awesome working alternative: https://github.com/mozilla/rr Here is a minimal working example: Setting breakpoint in GDB where the function returns

Answer 3

This is because this insn is still not support by prec.

It is fixed now. You can try the gdb-cvs-head.