[panda-users] Replay error

[Leek, Timothy - 0559 - MITLL]

Certainly our record / replay isn’t multi-core.

From: Manolis Stamatogiannakis <mstamat at gmail.com<mailto:mstamat at gmail.com>>
Date: Thursday, February 5, 2015 at 2:22 PM
To: "Leek, Timothy - 0559 - MITLL" <tleek at ll.mit.edu<mailto:tleek at ll.mit.edu>>
Cc: "Downing, Evan P" <edowning3 at gatech.edu<mailto:edowning3 at gatech.edu>>, "panda-users at mit.edu<mailto:panda-users at mit.edu>" <panda-users at mit.edu<mailto:panda-users at mit.edu>>
Subject: Re: [panda-users] Replay error

I'll take a lucky shot: Is "-cpu core2duo" supported?
IIRC, I've read somewhere that only 1 CPU is currently supported.

Best,
Manolis

2015-02-05 20:18 GMT+01:00 Leek, Timothy - 0559 - MITLL <tleek at ll.mit.edu<mailto:tleek at ll.mit.edu>>:
Hi Evan.  Dos it replay with any plugins?  That is, if you remove the
–panda replaymovie part?

Also, you shouldn’t need to specify the –hda windowsxp.img for replay.


From:  <Downing>, Evan P <edowning3 at gatech.edu<mailto:edowning3 at gatech.edu>>
Date:  Thursday, February 5, 2015 at 2:09 PM
To:  "panda-users at mit.edu<mailto:panda-users at mit.edu>" <panda-users at mit.edu<mailto:panda-users at mit.edu>>
Subject:  [panda-users] Replay error


Hey all,


I recorded a session with PANDA and now I'm attempting to replay it back
using the plugin 'replaymovie' (I've been able to get replay to work
successfully before with a different recording session, so I'm confused as
to why it won't work for this one).


I recorded it by using the following:

    $ sudo ./panda/qemu/x86_64-softmmu/qemu-system-x86_64 -cpu core2duo
-hda windowsxp.img  -vga std -net
nic,macaddr=02:00:00:00:00:01,model=rtl8139 -net tap,script=no,ifname=vm0
-vnc :0 -snapshot -monitor stdio

    (qemu) being_record evan_test

    ​(qemu) end_record


    (No errors seen while recording.)



I'm attempting to replay it:

    $ sudo ./panda/qemu/x86_64-softmmu/qemu-system-x86_64 -cpu core2duo
-vga std -net nic,macaddr=02:00:00:00:00:01,model=rtl8139 -net
tap,script=no,ifname=vm0 -vnc :0 -replay evan_test -panda ‘replaymovie'


The error I receive:


adding
/home/evan/panda/qemu/x86_64-softmmu/panda_plugins/panda_replaymovie.so to
panda_plugin_files 0
loading
/home/evan/panda/qemu/x86_64-softmmu/panda_plugins/panda_replaymovie.so
Success
loading snapshot
... done.

Logging all cpu states

[A bunch of stuff here. Processes 19% of instructions successfully.]

RR rr_assertion `0' failed at /home/evan/panda/qemu/rr_log.c:1025
Current log point:
{guest_instr_count=7600686304 pc=0x806d2797, secondary=0x80d1c0ec}
Next log entry type: RR_INPUT_4
Current replay point:
{guest_instr_count=7600686299 pc=0x806d2797, secondary=0x80d1c0ec}





In the source code for "rr_log.c" where the error occurred, it says "mz
we're trying to replay too early or we have the wrong kind of rr_nondet_log
 entry. this is cause for failure."

Can someone help me determine why this happened?


Thanks,

Evan



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