Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756979Ab0FIIcE (ORCPT ); Wed, 9 Jun 2010 04:32:04 -0400 Received: from mail-pz0-f176.google.com ([209.85.222.176]:54620 "EHLO mail-pz0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756934Ab0FIIcC (ORCPT ); Wed, 9 Jun 2010 04:32:02 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:content-transfer-encoding :in-reply-to:user-agent; b=V+2BQ7pw6O2ScekqRwxqXAey1IbTnEWe1GJhWsRXprMVTAOvP8PlCiEXaihstYUnfv IC962L+tIpyWeNboibgvvlOSurENiTD49tvgny6CJmK0vKQzwaYndw2aVmrkT7cwq4Wb hvFem9ansun431l8xDRnI9oADC+m5v6CS1iZ8= Date: Wed, 9 Jun 2010 16:35:59 +0800 From: =?utf-8?Q?Am=C3=A9rico?= Wang To: Alan Cc: =?utf-8?Q?Am=C3=A9rico?= Wang , Michal Marek , linux-kernel@vger.kernel.org Subject: Re: Additional info on modpost segfault Message-ID: <20100609083559.GC5875@cr0.nay.redhat.com> References: <20100604045118.GC5167@cr0.nay.redhat.com> <4C08A9D0.8000505@suse.cz> <1275929979.2923.0.camel@zowie.clueserver.org> <20100608055152.GA7110@cr0.nay.redhat.com> <1276021458.14066.3.camel@zowie.clueserver.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1276021458.14066.3.camel@zowie.clueserver.org> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3707 Lines: 101 On Tue, Jun 08, 2010 at 11:24:18AM -0700, Alan wrote: >On Tue, 2010-06-08 at 13:51 +0800, Américo Wang wrote: >> On Mon, Jun 07, 2010 at 09:59:39AM -0700, Alan wrote: >> >On Fri, 2010-06-04 at 09:22 +0200, Michal Marek wrote: >> >> On 4.6.2010 06:51, Américo Wang wrote: >> >> > On Thu, Jun 03, 2010 at 08:10:30PM -0700, alan wrote: >> >> >> Missed adding the actual segfault message: >> >> >> >> >> >> LD drivers/usb/built-in.o >> >> >> LD drivers/built-in.o >> >> >> LD vmlinux.o >> >> >> MODPOST vmlinux.o >> >> >> /bin/sh: line 1: 20665 Segmentation fault (core dumped) >> >> >> scripts/mod/modpost -o >> >> >> /home/alan/GitTrees/linux-2.6-mid-ref/Module.symvers -S vmlinux.o >> >> >> make[1]: *** [vmlinux.o] Error 139 >> >> >> make: *** [vmlinux.o] Error 2 >> >> >> >> >> >> I have looked at the gcc 4.4.4 changelog and I can't see anything >> >> >> that should cause this. >> >> >> >> >> > >> >> > Hmm, you need to find which program segfaults here. >> >> >> >> It's the modpost command run on vmlinux.o. Alan, can you try >> >> $ gdb --args scripts/mod/modpost -o Module.symvers -S vmlinux.o >> >> (gdb) r >> >> (wait for the segfault) >> >> (gdb) bt full >> >> >> >> and post the backtrace? >> > >> >Don't know if this will help much. >> > >> >This GDB was configured as "x86_64-redhat-linux-gnu". >> >For bug reporting instructions, please see: >> >... >> >Reading symbols >> >from /home/alan/GitTrees/linux-2.6-mid-ref/scripts/mod/modpost...(no >> >debugging symbols found)...done. >> >(gdb) r >> >Starting >> >program: /home/alan/GitTrees/linux-2.6-mid-ref/scripts/mod/modpost -o >> >Module.symvers -S vmlinux.o >> > >> >Program received signal SIGSEGV, Segmentation fault. >> >0x0000000000403711 in main () >> >(gdb) bt full >> >#0 0x0000000000403711 in main () >> >No symbol table info available. >> > >> >Trying to get it to compile with debugging info. >> > >> >> Try to append "-g" to HOSTCFLAGS in the top Makefile. ;) > >Thanks. Tried CFLAGS and that did not work... > >Here is the backtrace: >(gdb) bt full >#0 read_symbols (argc=5, argv=0x7fffffffe198) at >scripts/mod/modpost.c:1564 > license = > info = {size = 209695023, hdr = 0x7fffeb263000, > sechdrs = 0x7ffff48fcc2c, symtab_start = 0x7ffff7863e2c, > symtab_stop = 0x7ffff794341c, export_sec = 37, > export_unused_sec = 0, export_gpl_sec = 48, > export_unused_gpl_sec = 0, export_gpl_future_sec = 0, > strtab = 0x7ffff794341c "", modinfo = 0x0, modinfo_len = 0} > sym = > symname = > version = > mod = 0x610010 >#1 main (argc=5, argv=0x7fffffffe198) at scripts/mod/modpost.c:1999 > mod = > buf = {p = 0x0, pos = 0, size = 0} > kernel_read = > module_read = > dump_write = 0x7fffffffe4ed "Module.symvers" > opt = > err = > extsym_iter = > extsym_start = > >The line is does not like is: > > read_symbols(argv[optind++]); > >Not certain why... Hmm, it seems the segfault happens at 'license = get_modinfo(...)'? I can't spot any bug around that. If I were you, I would do a step by step debug with gdb. Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/