RR rr_assertion `current_item' failed at /home/dghost-ubuntu/fuzz/panda/panda/src/rr/rr_log.c:970

[dgh05t]

Hi,

I've normally built panda on ubuntu. but replay failed.

here's detail: built with instruction:

git clone https://github.com/panda-re/panda
cd panda
mkdir -p build && cd build
../build.sh

start a linux vm:

./panda-system-x86_64 -kernel ~/Downloads/linux-5.15.y-nokasan/arch/x86/boot/bzImage -drive file=~/imgs/stretch.img,format=raw -append "root=/dev/sda  nokaslr" -monitor stdio -m 4096 -smp 4 --enable-kvm

then, I tried to record:

(qemu) begin_record test
(qemu) writing snapshot:	./test-rr-snp
opening nondet log for write:	./test-rr-nondet.log

(qemu) end_record
(qemu) Time taken was: 10 seconds.
Checksum of guest memory: 0x94c7d494
Recording ready for use.

(qemu) quit

but when I try to replay:

/panda-system-x86_64 -kernel ~/Downloads/linux-5.15.y-nokasan/arch/x86/boot/bzImage -drive file=~/imgs/stretch.img,format=raw -append "root=/dev/sda  nokaslr" -monitor stdio -m 4096 -smp 4 --enable-kvm -replay test

then panda failed:

QEMU 2.9.1 monitor - type 'help' for more information
(qemu) loading snapshot
... done.
opening nondet log for read :	./test-rr-nondet.log
RR rr_assertion `current_item' failed at /home/dghost-ubuntu/fuzz/panda/panda/src/rr/rr_log.c:970
Current log point:
{guest_instr_count=0}
Next log entry type: RR_INPUT_4
Current replay point:
{guest_instr_count=0}
Aborted (core dumped)

Where's my problem, thank you.

[AndrewFasano]

PANDA doesn't support KVM or smp and you're using -smp 4 --enable-kvm. I suspect that's the problem. It should probably raise more obvious errors when you try - I'm guessing the guest wasn't functional when you took the recording.