[panda-users] Replay Failing

[Brendan Dolan-Gavitt]

The ARM issue seems to be a bug in QEMU. Replaying a recording requires
loading a saved snapshot, and it appears that the SD card device in QEMU
isn't properly loading the snapshot (you can verify this by trying to take
a snapshot with savevm and loading it with loadvm afterward). One
workaround would be to use the "armel" image instead, which does not use an
SD card.

As for the WinXP example, it's harder to tell what could be going wrong.
Are you able to do a successful recording using the i386 Linux image? (You
can test with panda/scripts/run_on_32bit_linux.py – it will download an
appropriate QCOW and run a command in a 32-bit x86 Debian image for you).

Also, note that you should not need to use sudo to run PANDA (and it's not
recommended).

Finally, I noticed you stopped by on IRC – unfortunately we can't be on
there 24 hours a day, so you may need to hang around a while before someone
can respond to your question. A persistent IRC client (e.g., irssi running
in a screen session) can help with this.

On Sat, Jul 8, 2017 at 3:59 AM, Danux <danuxx at gmail.com> wrote:

> Here is another try but now with WinXP, it is also failing :-(
>
> Running on:
>
> Linux panda 4.4.0-83-generic #106~14.04.1-Ubuntu SMP Mon Jun 26 18:10:19
> UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
>
> danux at panda:~/panda/build/i386-softmmu$ sudo ./qemu-system-i386 -drive
> file=/media/drive/winXP.qcow2,if=ide,cache=writeback -m 1024M --monitor
> stdio -vnc 192.168.1.74:1 -replay notepad
>
> [sudo] password for danux:
>
> QEMU 2.8.50 monitor - type 'help' for more information
>
> (qemu) loading snapshot
>
> ... done.
>
> opening nondet log for read : ./notepad-rr-nondet.log
>
> Ahead of log while looking for log entry of type RR_SKIPPED_CALL
>
> {guest_instr_count=7526}
>
> RR_INPUT_4 from RR_CALLSITE_READ_4
>
> FOUND DISAGREEMENT!
>
> Replay program point:
>
> {guest_instr_count=7528}
>
>
> Record program point:
>
> {guest_instr_count=7526}
>
>
> >>> guest instruction counts disagree
>
> notepad:        7528 (  0.00%) instrs.    0.09 sec.  0.30 GB ram.
>
> ERROR: replay failed!
>
> Time taken was: 0 seconds.
>
> Stats:
>
> RR_INPUT_1 number = 0, size = 0 bytes
>
> RR_INPUT_2 number = 0, size = 0 bytes
>
> RR_INPUT_4 number = 22, size = 308 bytes
>
> RR_INPUT_8 number = 25, size = 450 bytes
>
> RR_INTERRUPT_REQUEST number = 11, size = 154 bytes
>
> RR_EXIT_REQUEST number = 0, size = 0 bytes
>
> RR_SKIPPED_CALL number = 0, size = 0 bytes
>
> max_queue_len = 13
>
> ERROR: replay failed!
>
> On Fri, Jul 7, 2017 at 10:42 PM, Danux <danuxx at gmail.com> wrote:
>
>> Hi,
>>
>> When trying to run the replay option on a linux ARM system is failing as
>> follows, please help:
>>
>> (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: 75 seconds.
>>
>> (qemu) begin_replay test
>>
>> (qemu) loading snapshot
>>
>> qemu-system-arm: /home/danux/panda/hw/sd/sd.c:217: sd_ocr_powerup:
>> Assertion `!(sd->ocr & 0x80000000)' failed.
>>
>> Or by passing the replay in the command line:
>>
>>
>> danux at panda:~/panda/build/arm-softmmu$ ./qemu-system-arm  -M vexpress-a9
>> -sd snapshot.img -kernel vmlinuz-3.2.0-4-vexpress -initrd
>> initrd.img-3.2.0-4-vexpress  -replay test -m 256M
>>
>> audio: Could not init `oss' audio driver
>>
>> loading snapshot
>>
>> qemu-system-arm: Missing section footer for sd-card
>>
>> Failed to load vmstate
>>
>> Failed to start replay
>>
>>
>> Please help me
>>
>>
>> Thanks!
>>
>>
>>
>
>
> --
> DanUx
>
> _______________________________________________
> panda-users mailing list
> panda-users at mit.edu
> http://mailman.mit.edu/mailman/listinfo/panda-users
>
>


-- 
Brendan Dolan-Gavitt
Assistant Professor, Department of Computer Science and Engineering
NYU Tandon School of Engineering
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.mit.edu/pipermail/panda-users/attachments/20170708/3e248bbb/attachment.html