linux-kernel - Re: Additional info on modpost segfault

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Date:	Tue, 8 Jun 2010 13:51:52 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Alan <alan@...eserver.org>
Cc:	Michal Marek <mmarek@...e.cz>,
	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Additional info on modpost segfault

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:
><http://www.gnu.org/software/gdb/bugs/>...
>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. ;)

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