From owner-freebsd-hackers Wed Oct 16 12:21:12 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0D4B137B401 for ; Wed, 16 Oct 2002 12:21:11 -0700 (PDT) Received: from rootlabs.com (root.org [67.118.192.226]) by mx1.FreeBSD.org (Postfix) with SMTP id 65D2443E88 for ; Wed, 16 Oct 2002 12:21:10 -0700 (PDT) (envelope-from nate@rootlabs.com) Received: (qmail 40596 invoked by uid 1000); 16 Oct 2002 19:21:11 -0000 Date: Wed, 16 Oct 2002 12:21:11 -0700 (PDT) From: Nate Lawson To: Terry Lambert Cc: Frank C Pilarcik , hackers@freebsd.org Subject: Re: Help with System panics - Debugger output attached. In-Reply-To: <3DADAACC.831C4CBD@mindspring.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Wed, 16 Oct 2002, Terry Lambert wrote: > Frank C Pilarcik wrote: > > To whom it may concern, > > > > We have been experiencing intermittent system panics on system intended to > > handle email and web mail. Neither system load or traffic volume seems to > > have a bearing on when the panics occur. > > > > Any insight into our issue would be greatly appreciated. > > > > I have attached the debugger output (panic1.txt). > > This is a double panic. > > Please do the following: > > sysctl kern.sync_on_panic=0 > > And recreate the traceback, so as to not mask the first panic with > a second panic. > > -- Terry Additionally, the line that your gdb claims generated the trap was ip_input.c:759 which is the ip_freef(fp) line. ------------------ #endif } else if (fp) 759 :::::: ip_freef(fp); } else ip->ip_len -= hlen; ------------------ It seems that it may be possible for fp to be garbage (uninitialized) and thus this would trigger a fault. Note this is fixed in 4.7-RELEASE and above by removing the dangling ip_freef() and depending on the interior of the "if (mff)" case to free it instead. Upgrade to 4.7R and see if the problem goes away. -Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message