linux-kernel - Re: Additional info on modpost segfault

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Date:	Mon, 07 Jun 2010 09:59:39 -0700
From:	Alan <alan@...eserver.org>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Additional info on modpost segfault

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.

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