From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subject: Unable to handle kernel NULL pointer dereference at virtual address 00000000 Date: Wed, 2 Jul 2003 12:40:20 -0400 Sender: nfs-admin@lists.sourceforge.net Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Return-path: Received: from mgw-x4.nokia.com ([131.228.20.27]) by sc8-sf-list1.sourceforge.net with esmtp (Cipher TLSv1:DES-CBC3-SHA:168) (Exim 3.31-VA-mm2 #1 (Debian)) id 19Xkf0-0002lC-00 for ; Wed, 02 Jul 2003 09:40:46 -0700 Received: from esvir04nok.ntc.nokia.com (esvir04nokt.ntc.nokia.com [172.21.143.36]) by mgw-x4.nokia.com (Switch-2.2.6/Switch-2.2.6) with ESMTP id h62Geg918052 for ; Wed, 2 Jul 2003 19:40:42 +0300 (EET DST) Received: from esebh001.NOE.Nokia.com (unverified) by esvir04nok.ntc.nokia.com (Content Technologies SMTPRS 4.2.5) with ESMTP id for ; Wed, 2 Jul 2003 19:40:37 +0300 To: Errors-To: nfs-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Unsubscribe: , List-Archive: Hi, I got the latest nfs-utils from the sourceforge website and I am trying = to get a working nfs-kernel-server on an ARM processor running intimate = linux (Debian clone). I compiled the source code, installed the = binaries, setup=20 /etc/exports but when I try to access the server the kernel oops. Here is the scenario: 1. I can mount the exported directory successfully. 2. When I try to 'ls' the contents of the directory I get on the client: ls: : Input/Output error ls: : Input/Output error ... ls: : Input/Output error (the filenames are the exact ones on the server) 3. When I try to stop the nfs server from the script, it get's stuck = trying to unexport the exported filesystems even if the client has successfully unmounted. Exportfs -auv shows: unexporting from kernel=20 (and waits there forever) I have to reboot the machine to clean up nfs. My kernel version is: Linux version 2.4.18-rmk3 (andyc@rockhopper.crl.dec.com) (gcc version 2.95.2 19991024 (release)) #13 Wed May 1 19:38:27 EDT 2002 This is what the server prints when I try 'ls' after successfully = mounting: Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd =3D c0004000 *pgd =3D 00000000, *pmd =3D 00000000 Internal error: Oops: ffffffff CPU: 0 pc : [] lr : [] Not tainted sp : c25e7e38 ip : 40000013 fp : c25e7e44 r10: c4a9f7a0 r9 : c24cc214 r8 : c037ca00 r7 : c25e6000 r6 : c1a81000 r5 : c037ccb4 r4 : c25e7e48 r3 : 00000000 r2 : c25e7e50 r1 : c25e7e48 r0 : c037ccc0 Flags: nZcv IRQs off FIQs on Mode SVC_32 Segment user Control: C000F17F Table: C000F17F DAC: 00000015 Process nfsd (pid: 280, stackpage=3Dc25e7000) Stack: (0xc25e7e28 to 0xc25e8000) 7e20: c001ba48 c0024468 40000093 ffffffff c25e7e78 = c25e7e48 7e40: c001ba48 c0024438 00000001 c25e6000 c037ccc0 00000000 c037ccb4 = c24cc214 7e60: c1a81000 c24cc204 c037ca00 c25e7ec8 c25e7e7c c001bccc c001ba0c = c037ca00 7e80: c24cc214 c4a9f7a0 00000001 c4a8e800 c25e7e9c c00f9a64 00000006 = 00000006 7ea0: 00000006 c24cc214 c1a81000 c24cc204 c24f0e00 00000000 11270000 = c25e7f18 7ec0: c25e7ecc c4a8ee04 c4a8e7b0 00000001 c25e6000 c24f0f4c c25e7f14 = c25e7ee8 7ee0: 00000000 c0022d1c 00000003 c26180c0 c24cc204 c24cc204 c4a7b790 = c24cc000 7f00: c24cc200 c3fa56e0 c24f0e00 c25e7f54 c25e7f1c c4a96bb8 c4a8eb88 = c24f0e00 7f20: c25fc014 c3fa56e0 c25e7f54 c25e7f38 c24f0e00 c4a9eb94 c4a7b790 = 00000001 7f40: c25fc014 c4a9e618 c25e7f78 c25e7f58 c4a8c6ac c4a96b00 c24f0f38 = c24f0e00 7f60: c25fc014 00000001 c4a9eb94 c25e7fb4 c25e7f7c c4a72ed8 c4a8c5dc = c4a9eb74 7f80: 00000020 00000000 00000000 c4a9f334 c015c284 0003d570 c4a9f338 = c25e6000 7fa0: c25e6000 c4a9f7a0 c25e7ffc c25e7fb8 c4a8c408 c4a72bcc c25e6344 = c25e6334 7fc0: c3fa56e0 c24f0e00 c2509fc8 c256bfc8 c25e6000 c24f0e00 c3fa56e0 = 00000000 7fe0: fffffff4 c4a8c1c4 00000000 00000000 00000000 c25e8000 c001ac5c = c4a8c1d0 Backtrace: Function entered at [] from [] Function entered at [] from [] r8 =3D C037CA00 r7 =3D C24CC204 r6 =3D C1A81000 r5 =3D C24CC214 r4 =3D C037CCB4 Function entered at [] from [] Function entered at [] from [] Function entered at [] from [] Function entered at [] from [] r8 =3D C4A9EB94 r7 =3D 00000001 r6 =3D C25FC014 r5 =3D C24F0E00 r4 =3D C24F0F38 Function entered at [] from [] Function entered at [] from [] Code: e5903004 e5802004 e5810008 e5823004 (e5832000) Is there a patch for this problem? I am kind of new to kernel programming, so does anyone know=20 how to use this debug information to figure out where in the source code = the problem appears? Also, should I look into updating the kernel or this is not necessary? Please, I couldn't find anything useful from the mail archive so any = help or suggestion even to get me started on something would be = immensely appreciated. Thank you, Nikos ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs