[panda-users] Replay Failing

Mon Jul 10 21:59:46 EDT 2017

Got it, will file it and in the meantime will use a board with PCI Support
as suggested, will keep you posted.

On Mon, Jul 10, 2017 at 6:57 PM, Brendan Dolan-Gavitt <brendandg at nyu.edu>
wrote:

> I actually checked yesterday and the bug is still present in the newest
> version of QEMU. It may be worth filing a bug report with them.
>
> On Mon, Jul 10, 2017 at 9:56 PM Danux <danuxx at gmail.com> wrote:
>
>> You were right Brendan, the loadvm command failed with same error, but I
>> installed Qemu through Panda installation script, I assumed it uses a
>> working version.
>>
>> Can I upgrade Qemu to latest version separetely, or I need to compile
>> Qemu from scratch with Panda libraries?
>>
>> Thanks.
>>
>> On Sat, Jul 8, 2017 at 6:23 PM, Brendan Dolan-Gavitt <brendandg at nyu.edu>
>> wrote:
>>
>>> It looks like the vexpress-a9 machine doesn't have a PCI bus, so you
>>> can't use IDE or SATA devices. However, if you need big endian I think
>>> you're out of luck anyway – I believe the vexpress-a9 board is also little
>>> endian. QEMU does support big endian arm, but I think it doesn't model any
>>> boards that use big-endian by default:
>>>
>>> https://stackoverflow.com/questions/41571643/emulatin-
>>> big-endian-arm-system-with-qemu
>>>
>>> (That answer is from one of the QEMU developers. Things may have changed
>>> since 2011 though.)
>>>
>>> Moving this back to the mailing list so that other people can benefit...
>>>
>>> -Brendan
>>>
>>> On Sat, Jul 8, 2017 at 9:02 PM, Danux <danuxx at gmail.com> wrote:
>>>
>>>> Hi Brendan,
>>>>
>>>> Thanks a lot for your help.
>>>> Happy to get in touch with you, really like Panda concept so hope to
>>>> get this solved.
>>>>
>>>> Is there a way to use ide or something else instead of sd? I used -sd
>>>> option just because I followed a blog.
>>>>
>>>> I need ARM big endian,  little endian does not help me.
>>>>
>>>> Will try all those suggestions and come back here with my feedback.
>>>>
>>>> On Jul 8, 2017 7:37 PM, "Brendan Dolan-Gavitt" <brendandg at nyu.edu>
>>>> wrote:
>>>>
>>>> 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
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Brendan Dolan-Gavitt
>>> Assistant Professor, Department of Computer Science and Engineering
>>> NYU Tandon School of Engineering
>>>
>>
>>
>>
>> --
>> DanUx
>>
> --
> Brendan Dolan-Gavitt
> Assistant Professor, Department of Computer Science and Engineering
> NYU Tandon School of Engineering
>

-- 
DanUx
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