From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268729AbUHTUiA (ORCPT ); Fri, 20 Aug 2004 16:38:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268735AbUHTUh7 (ORCPT ); Fri, 20 Aug 2004 16:37:59 -0400 Received: from mxfep01.bredband.com ([195.54.107.70]:36506 "EHLO mxfep01.bredband.com") by vger.kernel.org with ESMTP id S268729AbUHTUf0 (ORCPT ); Fri, 20 Aug 2004 16:35:26 -0400 Subject: Re: 2.6.8.1-mm, programs crashing on x86_64 From: Alexander Nyberg To: linux-kernel@vger.kernel.org Cc: ak@suse.de, Andrew Morton In-Reply-To: <1093023902.908.8.camel@boxen> References: <1093023902.908.8.camel@boxen> Content-Type: text/plain Message-Id: <1093034107.796.7.camel@boxen> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Fri, 20 Aug 2004 22:35:07 +0200 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > This does not happen in linus -bk. I noticed it happens in > 2.6.8-mm2 also, but not sure about earlier. I'll try some earlier > -mm's and if noone knows what could be it I'll do a binary search. > > Must be quite newly introduced though... > > boxen:~# chroot /mnt/store/x86/ bash > bash[911] bad frame in 32bit signal deliver frame:00000000ffffd220 rip:556605d6 rsp:ffffd500 orax:ffffffffffffffff > bash[910] bad frame in 32bit signal deliver frame:00000000ffffd220 rip:556605d6 rsp:ffffd500 orax:ffffffffffffffff > bash[910]: segfault at 00000000ffffd51c rip 00000000556605d6 rsp 00000000ffffd500 error 7 > bash[911]: segfault at 00000000ffffd51c rip 00000000556605d6 rsp 00000000ffffd500 error 7 > I forgot to tell you what environment I'm in; debian in a pure 64-bit environment. I've got a chroot at /mnt/store/x86 where I compile kernels for x86 boxes. .config snippet: CONFIG_BINFMT_ELF=y CONFIG_BINFMT_MISC=y CONFIG_IA32_EMULATION=y CONFIG_IA32_AOUT=y CONFIG_COMPAT=y CONFIG_SYSVIPC_COMPAT=y CONFIG_UID16=y Anyway, found the trouble-maker. Reverting below patch fixes issues. diff -uprN linux-2.6.8-rc3-mm1/include/asm-x86_64/processor.h linux-2.6.8-rc3-mm2/include/asm-x86_64/processor.h --- linux-2.6.8-rc3-mm1/include/asm-x86_64/processor.h 2004-08-20 21:10:01.739109232 +0200 +++ linux-2.6.8-rc3-mm2/include/asm-x86_64/processor.h 2004-08-20 21:09:52.095575272 +0200 @@ -164,9 +164,9 @@ static inline void clear_in_cr4 (unsigne /* - * User space process size: 512GB - 1GB (default). + * User space process size. */ -#define TASK_SIZE (0x0000007fc0000000UL) +#define TASK_SIZE (test_thread_flag(TIF_IA32) ? 0xffffd000 : 0x0000007fc0000000UL) /* This decides where the kernel will search for a free chunk of vm * space during mmap's.