From owner-freebsd-bugs Sun Sep 30 2:50: 4 2001 Delivered-To: freebsd-bugs@hub.freebsd.org Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21]) by hub.freebsd.org (Postfix) with ESMTP id B3F3937B40E for ; Sun, 30 Sep 2001 02:50:01 -0700 (PDT) Received: (from gnats@localhost) by freefall.freebsd.org (8.11.4/8.11.4) id f8U9o1T21972; Sun, 30 Sep 2001 02:50:01 -0700 (PDT) (envelope-from gnats) Date: Sun, 30 Sep 2001 02:50:01 -0700 (PDT) Message-Id: <200109300950.f8U9o1T21972@freefall.freebsd.org> To: freebsd-bugs@FreeBSD.org Cc: From: Tony Finch Subject: Re: kern/30495: ugen bug (?): "page fault while in kernel mode" when using a PPP over ATM program Reply-To: Tony Finch Sender: owner-freebsd-bugs@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org The following reply was made to PR kern/30495; it has been noted by GNATS. From: Tony Finch To: freebsd-gnats-submit@FreeBSD.org Cc: Tony Finch Subject: Re: kern/30495: ugen bug (?): "page fault while in kernel mode" when using a PPP over ATM program Date: Sun, 30 Sep 2001 09:39:57 +0000 I recently did a little diagnosis using the core files this bug has produced for me. The trap is occurring inside some INVARIANTS code in malloc(), so I tried turning off INVARIANTS. It was not surprising that this failed to improve matters: it only made the crashes more random :-) (Sometimes the machine locked up completely, sometimes the USB died but everything else continued to work -- LEDs on the ADSL modem turned off and `usbdevs` would hang when I tried to run it and unplugging and replugging the modem didn't fix things -- and sometimes I got a normal page fault panic.) The crashes don't seem to be related to memory pressure; in fact I haven't noticed any particular trigger for them even though several have happened while I have been using the machine. I have recently started running ntpd and the crashes seem to happen more often now, however they haven't happened when I have been doing bulk downloads... Tony. -- f.a.n.finch FAIR ISLE FAEROES SOUTHEAST ICELAND: SOUTHEAST 5 TO 7, OCCASIONALLY GALE 8, DECREASING 4 OR 5. OCCASIONAL RAIN. MODERATE OR POOR. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message