From owner-freebsd-bugs@FreeBSD.ORG  Wed Apr 23 09:40:01 2014
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@smarthost.ysv.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 8A047167
 for <freebsd-bugs@smarthost.ysv.freebsd.org>;
 Wed, 23 Apr 2014 09:40:01 +0000 (UTC)
Received: from freefall.freebsd.org (freefall.freebsd.org
 [IPv6:2001:1900:2254:206c::16:87])
 (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 665761922
 for <freebsd-bugs@smarthost.ysv.freebsd.org>;
 Wed, 23 Apr 2014 09:40:01 +0000 (UTC)
Received: from freefall.freebsd.org (localhost [127.0.0.1])
 by freefall.freebsd.org (8.14.8/8.14.8) with ESMTP id s3N9e100026467
 for <freebsd-bugs@freefall.freebsd.org>; Wed, 23 Apr 2014 09:40:01 GMT
 (envelope-from gnats@freefall.freebsd.org)
Received: (from gnats@localhost)
 by freefall.freebsd.org (8.14.8/8.14.8/Submit) id s3N9e1Fw026466;
 Wed, 23 Apr 2014 09:40:01 GMT (envelope-from gnats)
Resent-Date: Wed, 23 Apr 2014 09:40:01 GMT
Resent-Message-Id: <201404230940.s3N9e1Fw026466@freefall.freebsd.org>
Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer)
Resent-To: freebsd-bugs@FreeBSD.org
Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org,
 "Ivan A. Kosarev" <ikosarev@accesssoftek.com>
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 7A30BEB4
 for <freebsd-gnats-submit@FreeBSD.org>; Wed, 23 Apr 2014 09:30:40 +0000 (UTC)
Received: from cgiserv.freebsd.org (cgiserv.freebsd.org
 [IPv6:2001:1900:2254:206a::50:4])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 66F0818AE
 for <freebsd-gnats-submit@FreeBSD.org>; Wed, 23 Apr 2014 09:30:40 +0000 (UTC)
Received: from cgiserv.freebsd.org ([127.0.1.6])
 by cgiserv.freebsd.org (8.14.8/8.14.8) with ESMTP id s3N9UeQg091369
 for <freebsd-gnats-submit@FreeBSD.org>; Wed, 23 Apr 2014 09:30:40 GMT
 (envelope-from nobody@cgiserv.freebsd.org)
Received: (from nobody@localhost)
 by cgiserv.freebsd.org (8.14.8/8.14.8/Submit) id s3N9UWV2088429;
 Wed, 23 Apr 2014 09:30:32 GMT (envelope-from nobody)
Message-Id: <201404230930.s3N9UWV2088429@cgiserv.freebsd.org>
Date: Wed, 23 Apr 2014 09:30:32 GMT
From: "Ivan A. Kosarev" <ikosarev@accesssoftek.com>
To: freebsd-gnats-submit@FreeBSD.org
X-Send-Pr-Version: www-3.1
Subject: misc/188911: sysctl(KERN_PROC_VMMAP) takes too long
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs/>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 23 Apr 2014 09:40:01 -0000


>Number:         188911
>Category:       misc
>Synopsis:       sysctl(KERN_PROC_VMMAP) takes too long
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Apr 23 09:40:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Ivan A. Kosarev
>Release:        10.0
>Organization:
Access Softek, Inc
>Environment:
FreeBSD fbsd10.unicals.com 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 16 22:34:59 UTC 2014     root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
With a mmap() call with a large 'size' parameter a subsequent sysctl(KERN_PROC_VMMAP) call takes too long to perform.
>How-To-Repeat:

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>

#include <unistd.h>
#include <dlfcn.h>
#include <fcntl.h>

#include <sys/sysctl.h>
#include <sys/user.h>
#include <sys/mman.h>


int main(void)
{
    int mib[4];
    size_t size;
    int err;
    void *p;

    printf("#1\n");

    p = mmap((void*) 0x3ffffffff000, 0x80000001000,
        PROT_READ | PROT_WRITE,
        MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
        -1, 0);
    assert(p != MAP_FAILED);

    printf("#2\n");

    mib[0] = CTL_KERN;
    mib[1] = KERN_PROC;
    mib[2] = KERN_PROC_VMMAP;
    mib[3] = getpid();

    size = 0;
    err = sysctl(mib, 4, NULL, &size, NULL, 0);  /* takes about 40 seconds */
    assert(err == 0);

    printf("#3\n");

    return EXIT_SUCCESS;
}
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: