From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268197AbUHNIDw (ORCPT ); Sat, 14 Aug 2004 04:03:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268200AbUHNIDw (ORCPT ); Sat, 14 Aug 2004 04:03:52 -0400 Received: from marc2.theaimsgroup.com ([63.238.77.172]:50910 "EHLO mailer.progressive-comp.com") by vger.kernel.org with ESMTP id S268197AbUHNIDq (ORCPT ); Sat, 14 Aug 2004 04:03:46 -0400 Date: Sat, 14 Aug 2004 04:03:41 -0400 (EDT) From: Hank Leininger X-X-Sender: Hank Leininger To: Denis Vlasenko cc: linux-kernel@vger.kernel.org Subject: Re: PROBLEM: 2.4.26 OOPS in __kmem_cache_alloc In-Reply-To: <200408141039.05915.vda@port.imtp.ilyichevsk.odessa.ua> Message-ID: <010408140344290.12915@timmy.spinoli.org> References: <010408121718530.12915@timmy.spinoli.org> <200408141039.05915.vda@port.imtp.ilyichevsk.odessa.ua> X-Marks-The: Spot MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sat, 14 Aug 2004, Denis Vlasenko wrote: > On Saturday 14 August 2004 06:43, Hank Leininger wrote: > > The primary MARC server has been out of production for, oh, about > > > > [horror story abridged] > > Oh no. > > > Unable to handle kernel NULL pointer dereference at virtual address > > 00000021 *pde = 00000000 [snip] > > Code; c01f20fb <__kmem_cache_alloc+b/130> > > 00000000 <_EIP>: > > Code; c01f20fb <__kmem_cache_alloc+b/130> <===== > > 0: 8b 5c 24 20 mov 0x20(%esp,1),%ebx <===== > > Code; c01f20ff <__kmem_cache_alloc+f/130> > > 4: f7 c7 01 00 00 00 test $0x1,%edi > > Code; c01f2105 <__kmem_cache_alloc+15/130> > > a: 0f 84 f5 00 00 00 je 105 <_EIP+0x105> > > Code; c01f210b <__kmem_cache_alloc+1b/130> > > 10: f6 43 30 01 testb $0x1,0x30(%ebx) > > Strange. "Unable to handle kernel NULL pointer dereference > at virtual address 00000021". But %esp == 0xd426ddf8 > and 0x20(%esp,1) == (%esp+0x20) != (0x00000021).... > Hmmm. But _%ebp_ is equal to 00000001! > > I just checked: "8b 5c 24 20" is indeed "mov 0x20(%esp,1),%ebx", > it's not a ksymoops bug... > > What kind of CPU do you use? When that OOPS was taken, an Athlon XP 2500+ Barton. The kernel is still compiled for SMP (for when it was running with dual Athlon MP 2400+'s; that's where the second, old, less reliable OOPS occurred). > Please send me your mm/slab.c and mm/slab.o (from > the kernel build directory). Sure (sent in a separate email off-list, to spare l-k, unless there is more interest). Thanks, Hank Leininger E407 AEF4 761E D39C D401 D4F4 22F8 EF11 861A A6F1 -----BEGIN PGP SIGNATURE----- iD8DBQFBHcddIvjvEYYapvERAufTAJwInznww51XBpPi0/evrPgzinfBNQCfQqRY mcAOrBxNWrs6nPPL/38Oei8= =wevd -----END PGP SIGNATURE-----