[Bug 193870] New: Large data-set perl script which forks child processes will coredump near exit()

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Sep 23 12:40:22 UTC 2014


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193870

            Bug ID: 193870
           Summary: Large data-set perl script which forks child processes
                    will coredump near exit()
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: lsim4242 at gmail.com

Hi,
I do not know whether I should be 'bugging' to the perl mob, or
to the FreeBSD amd64 group.

Well here goes.  I am able to reduce the core-dumping problem to a perl script
which can be used to generate the problem.

Basically, you have a perl script which chews up N byte size of memory,
then forks out a few child processes (in my case 2). Then each child
does an 'exit(0)'. The parent then 'wait()' for each child and then exit.

Where N can be larger than (Your real memory/number of child forks).
This is to force the swap space to be used.

On running this script on (Fbsd 10.0-RELEASE-p3 amd64) perl v5.16.3,
the script will core-dump.

Additional info:
** On i386 FreeBSD versions, the core-dump does *not* happen including
   Fbsd 10.0 i386

** As I have only recently started using amd64, I do not know if this
   problem also exist in prior versions of Fbsd 10.0 amd64.

** I also wrote a C version, and that ran fine on the amd64 OS!

Please help as I really would like to used amd64 instead of i386 versions
of Fbsd.

Thanks
sim

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