# Linux Kernel Module Cheat

##### 23.9.5.1. QEMU reverse debugging

QEMU replays support checkpointing, and this allows for a simplistic "reverse debugging" implementation since v5.2.0:

    ./run --eval-after './linux/rand_check.out;./linux/poweroff.out;' --record
    ./run --eval-after './linux/rand_check.out;./linux/poweroff.out;' --replay --gdb-wait

On another shell:

    ./run-gdb start_kernel

In GDB:

    n
    n
    n
    n
    reverse-continue

and we are back at `start_kernel`

`reverse-continue` proceeds to the latest of the earlier breakpoints or to the very beginning if there were no breakpoints before.