From owner-freebsd-bugs@FreeBSD.ORG  Thu Mar 19 14:14:44 2015
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 3DF9CE3B
 for <freebsd-bugs@FreeBSD.org>; Thu, 19 Mar 2015 14:14:44 +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 24D967AC
 for <freebsd-bugs@FreeBSD.org>; Thu, 19 Mar 2015 14:14:44 +0000 (UTC)
Received: from bugs.freebsd.org ([127.0.1.118])
 by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id t2JEEhnX024286
 for <freebsd-bugs@FreeBSD.org>; Thu, 19 Mar 2015 14:14:43 GMT
 (envelope-from bugzilla-noreply@freebsd.org)
From: bugzilla-noreply@freebsd.org
To: freebsd-bugs@FreeBSD.org
Subject: [Bug 198706] [libstand] ngets shall exit on EOF
Date: Thu, 19 Mar 2015 14:14:44 +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: 11.0-CURRENT
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: int0dster@gmail.com
X-Bugzilla-Status: New
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: <bug-198706-8@https.bugs.freebsd.org/bugzilla/>
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 <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: Thu, 19 Mar 2015 14:14:44 -0000

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198706

            Bug ID: 198706
           Summary: [libstand] ngets shall exit on EOF
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: int0dster@gmail.com

Hi All,

I`ve noted that ngets() from libstand starts consuming CPU like mad when
EOF appears on stdin.  I see this issue with bhyveload when forwarding "user
input" over pipe. Here is the simpliest program to reproduce:

cat > ./bget.c

#include 
#include 
#include 
#include

int main()
{
char str[512];

    for (;;) {
            ngets(str, sizeof(str));
            if (str[0] == '\n') // <--- The program shall exit on \nEOF here,
but it 
 // spins inside ngets() and does not reach this point
                    break;
    }
    return 0;
}

$ echo "balbalbalabl" | ./bget &
$

There is no problem in libstand when it is used in the real boot loader, but
inside
bhyveload it has a bug described above.

There is a github pull request with suggested patch

https://github.com/freebsd/freebsd/pull/23

-- 
You are receiving this mail because:
You are the assignee for the bug.