[CRIU] Restore failed. Exit code: 43

[Paschalis Mpeis]

Thanks for your replies Pavel.
Please see inline!

​My 1st try on restore:​


> >
> >     criu_set_log_file("restore.log");
> >     pid = criu_restore_child();
> >     if (pid <=0){ what_err_ret_mean(pid);
> >     exit(-1);
> >     }
> >
> >     if(waitpid(pid, &ret, 0)<0){
> >     perror("Can't wait for restore");
> >     kill(pid,SIGKILL);
> >     exit(-1);
> >     }
> >     return chk_exit(ret,SUCC_DUMP_ECODE);
> >
> >
> > ​chk_exit​ was printing the "exit 43" message. It is the function found
> here:
> > https://github.com/xemul/criu/blob/master/test/libcriu/lib.c
>
> Ah, I see :) Then everything seem to be OK. Look, when you call the
> criu_dump()
> with zero pid what gets dumped is the process that does this call in the
> state
> when it has just sent the dump request to service. And this particular
> state
> is written in the images.
>
> Thus, when you call criu_restore_child() the restored process gets
> restored in
> a state where it "thinks" as if it has just received the response from the
> "dump"
> request.
>
> Then, in the code above, this situation ends up in ret = SUCC_RSTR_ECODE
> (which
> is 43) and exit(ret) which thus is exit(43). Then the parent wait()-s for
> the
> kid checks it exit code, sees it being the 43 one a prints on the screen.
>
> And this is what I see in your logs :) So, for now, everything looks to
> work as
> expected. If you think it's not, let's discuss how you expect it to work,
> we'll
> try to help.
>
>
​My second try on restore:​


> > Then I changed the restore code simply:
> >
> >     criu_set_log_file("restore.log");
> >     criu_restore();
> >
> >
> > ​This produces a similar restore.log, with success messages, but the
> program does not seem to continue.
>
> But according to the code you have shown the program continues with
> returning
> from the criu_dump() call, then sets ret to SUCC_RSTR_ECODE == 43, then
> calls
> exit().
> ​
>

On my 1st try, the restore function was calling "chk_exit". But this
function never calls "exit". Where did the exit occurred?

Also, ehon the second try, I simply call criu_restore(). After the restore,
I simply return 0, and then the execution flow goes to the main function,
which then simply returns.

But I do not see anything being replayed, e.g.
 output of the initial execution
​ (that I captured earlier)​
does not show up again
​. What am I doing wrong here?

My main function is very simple, like this:

>     if(crMode==CAPTURE){
>         runLinpack();
> ​      // in above function, at some point of execution,
>       // I initialise_criu, and then I dump the application
>    }
>     else if(crMode==REPLAY){
>         initialise_criu(CRIU_IMG_DIR);
>         restoreApplication();
>     }
>     return 0;


I run the main function two separate times. One to capture, but still
continue playing the application, and another one to replay the application
from the earlier snapshot!

Cheers,
Paschalis
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