From owner-freebsd-bugs@FreeBSD.ORG Tue Sep 23 12:40:22 2014 Return-Path: Delivered-To: freebsd-bugs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 67D7BF12 for ; Tue, 23 Sep 2014 12:40:22 +0000 (UTC) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 34435771 for ; Tue, 23 Sep 2014 12:40:22 +0000 (UTC) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id s8NCeMEO039664 for ; Tue, 23 Sep 2014 12:40:22 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 193870] New: Large data-set perl script which forks child processes will coredump near exit() Date: Tue, 23 Sep 2014 12:40:22 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: lsim4242@gmail.com X-Bugzilla-Status: Needs Triage X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Sep 2014 12:40:22 -0000 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@FreeBSD.org Reporter: lsim4242@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 -- You are receiving this mail because: You are the assignee for the bug.