Re: "Requested kernel interface version is not supported"

From: Dr M. Calleja (
Date: Wed Nov 28 2007 - 01:45:19 PST

  • Next message: Paul H. Hargrove: "Re: "Requested kernel interface version is not supported""
    On Nov 27 2007, Paul H. Hargrove wrote:
    >Mark Calleja wrote:
    >> Hi,
    >> I'm trying to get checkpointing using the BLCR kernel modules to work 
    >> with Condor (, but I've run into a 
    >> hitch. I can get a sample, dynamically linked, x86_64 application to 
    >> run and checkpoint successfully using v0.6.1 of the BLCR modules when 
    >> run directly from the command line. However, when submitted to the 
    >> same machine using Condor via a Parrot shell 
    >> (, then although the job 
    >> starts running successfully with cr_run, attempts to checkpoint the 
    >> job with a separate process using cr_checkpoint fail with the error 
    >> message:
    >> "Requested kernel interface version is not supported"
    >> Is there any reason why this error should occur, especially when 
    >> command-line operation on the same box succeeds? BTW, Parrot is used 
    >> to provide a user-space file system which talks to a chirp server 
    >> ( in order to save the 
    >> checkpointed state off the execute host. The tests were carried out on 
    >> a Debian "etch" box, kernel  2.6.18-5-amd64, and the application was 
    >> built and linked with g++ v 4.1.2.
    >> Regards,
    >> Mark
    >  Sorry for the slow response.  I am still catching up on e-mail from 
    >the U.S. holiday.
    >  The message you see indicates a version mismatch between the BLCR 
    >library and the BLCR kernel module(s).  Since you can checkpoint at the 
    >command line but not with Parrot, I suspect that you may have 2 versions 
    >of BLCR installed and that the cr_run and/or cr_checkpoint command in 
    >the PATH differs between the two methods.  To confirm this, you could 
    >try "cr_run --version" both at the command line and via Parrot.  I 
    >suspect they will report different version numbers.  If that is the case 
    >you will need to fix your PATH and/or remove the older of the two 
    >installations.  If the same version is reported both times, let me know 
    >and we can try something else to isolate the cause of your problems.
    Hi Paul,
    The problem appears to be at the Parrot/BLCR interface, and unrelated to 
    Condor. Running "cr_run --version" from an ordinary shell and one that's 
    running under Parrot gives the same result:
    banani$  cr_run --version
    /usr/local/bin/cr_run: version 0.6.1
    This is not surprising since this is my desktop and has only one version of 
    BLCR installed, namely the one I installed. However, the problem raises its 
    head when I run cr_checkpoint from the Parrot shell: it works just dandy 
    from an ordinary shell but from within Parrot I get:
    banani$ cr_checkpoint 30697
    Failed cr_init(): Requested kernel interface version is not supported
    The developer of Parrot (Doug Thain, at Notre Dame) is a very amenable chap 
    and I'm confident he'd be willing to help troubleshoot this.
    Thanks for your help and let me know if it would aid your debugging process 
    if I was to give you an account on my test machine.

  • Next message: Paul H. Hargrove: "Re: "Requested kernel interface version is not supported""