From owner-freebsd-bugs Mon Apr 21 09:23:46 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id JAA27958 for bugs-outgoing; Mon, 21 Apr 1997 09:23:46 -0700 (PDT) Received: from sendero.i-connect.net (sendero-ppp.i-Connect.Net [206.190.143.100]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id JAA27953 for ; Mon, 21 Apr 1997 09:23:42 -0700 (PDT) Received: (from shimon@localhost) by sendero.i-connect.net (8.8.5/8.8.5) id JAA04917; Mon, 21 Apr 1997 09:23:36 -0700 (PDT) Message-ID: X-Mailer: XFMail 1.1-alpha [p0] on FreeBSD Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <199704210852.SAA27852@godzilla.zeta.org.au> Date: Mon, 21 Apr 1997 09:10:16 -0700 (PDT) Organization: iConnect Corp. From: Simon Shapiro To: Bruce Evans Subject: Re: Mystery of the X11 Panic... Cc: freebsd-bugs@freebsd.org Sender: owner-bugs@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hi Bruce Evans; On 21-Apr-97 you wrote: > [cc list trimmed to remove -hackers] > > >Fatal trap 12 - Page fault while in kernel mode. in virtual address > >0xf71e0014. Tracing back shows that bash (?!) was the culprit, causing > it > >after calling _Xsyscall -> _syscall -> _vm_open -> _spec_open. > > > >Things go south at _spec_open + 0x6e, complaining about cmpl $0,0(%eax). > > This means that cdevsw[maj]->d_open is bad (probably null) although > cdevsw[maj] != NULL. This might be caused by a buggy or stale LKM. > Driver LKM's tend to cause this problem if they are unloaded. Bash > may trigger the problem because it does an opendir() on device files > (but I thought I fixed this by not opening device files in opendir()). > I wouldn't use LKMs for anything important. I thought about that and disabled all lkm's, I think. It only happens to bash if X11R6 is running and only on new 2.2 kernels. I think we need to make sure the kernel does not panic. Right? What can I do to help close this hole? Simon