Hi Joshua,
I tried it locally, using pstack, which seems to be the same
as gstack, but on Ubuntu instead of SUSE. I do:
dmtcp_restart ckpt_a.out_*.dmtcp [for a ckpt image of a.out]
It does fail for me, but with the following message:
> gene@dekaksi:/tmp/gene$ pstack 12805
> Could not read /proc/12805/cmdline: Success
>
> 12805: (command line?)
> could not find _DYNAMIC symbol
I then looked at /proc/12805/cmdline, and it was indeed empty.
This seems to be why pstack/gstack is failing.
/proc/*/cmdline is non-empty prior to checkpoint, but not on restart.
So, it fails on restart.
Kapil,
Had you looked into recreating /proc/*/cmdline on restart? I remember
you did something like that with the proc filesystem, but I've forgotten
the details. In any case, ps is showing [mtcp_restart] for the process
name, and no cmdline, with a trival a.out application. Do you know
the current status?
Thanks,
- Gene
On Tue, Aug 20, 2013 at 08:44:17PM +0000, Louie, Joshua D wrote:
> Hi,
> I was wondering if you knew why when I try to run gstack on
> an mtcp_restart process it crashes? I have tried with very simple programs,
> and as soon as I do gstack it just dies. It does not seem to me that gstack
> sends any particular signal.
>
> Simple program:
> #include <dmtcpaware.h>
>
> int main()
> {
> /* Checkpoint */
> int result = dmtcpCheckpoint();
>
> /* Loop forever so we can do gstack on the PID */
> while (1);
> return 0;
> }
>
> I have tried this on both the trunk version and earlier versions (like
> 1.2.4), all of them result in it killing the restarted process.
>
> Joshua Louie
>
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