Mailinglist Archive: opensuse-kernel (62 mails)

[Andreas Jaeger <aj@xxxxxxxxxx>]

On Tuesday 20 April 2010 08:33:11 Bernhard Walle wrote:
> Am 19.04.2010 20:12, schrieb Andreas Jaeger:
> > (gdb) disassemble /r apbt_cpuhp_notify
> > Dump of assembler code for function apbt_cpuhp_notify:
> > 0xc02240f0<apbt_cpuhp_notify+0>:     00 00  add    %al,(%eax)
> > 0xc02240f2<apbt_cpuhp_notify+2>:     00 00  add    %al,(%eax)
> > 0xc02240f4<apbt_cpuhp_notify+4>:     00 00  add    %al,(%eax)
> > 0xc02240f6<apbt_cpuhp_notify+6>:     00 00  add    %al,(%eax)
> > 0xc02240f8<apbt_cpuhp_notify+8>:     00 00  add    %al,(%eax)
> > 0xc02240fa<apbt_cpuhp_notify+10>:    00 00  add    %al,(%eax)
> > 0xc02240fc<apbt_cpuhp_notify+12>:    00 00  add    %al,(%eax)
> > 0xc02240fe<apbt_cpuhp_notify+14>:    00 00  add    %al,(%eax)
> > 0xc0224100<apbt_cpuhp_notify+16>:    00 00  add    %al,(%eax)
>
> Looks like gdb reads the wrong values from /proc/kcore.

Should I open a bugreport?

> Could you give crash live debugging a try? Just invoking crash with the
> kernel should work:
>
>   % crash -s /boot/vmlinux-2.6.34-rc4-4-desktop
>   crash> p jiffies

Does not work for me:

crash -s /boot/vmlinux-2.6.34-rc4-4-desktop 
crash: cannot determine idle task addresses from init_tasks[] or runqueues[]

crash: cannot resolve "init_task_union"

Another bug report?
> The disassemble feature of GDB should also work without /proc/kcore,
> just with the kernel image. Doesn't it?

Yes, that works and looks sane:
gdb /boot/vmlinux-2.6.34-rc4-4-desktop
...
(gdb) disassemble apbt_cpuhp_notify
Dump of assembler code for function apbt_cpuhp_notify:
   0xc02240f0 <+0>:     push   %ebp
   0xc02240f1 <+1>:     mov    $0xc0a03fe0,%eax
   0xc02240f6 <+6>:     mov    %esp,%ebp
   0xc02240f8 <+8>:     sub    $0x14,%esp
   0xc02240fb <+11>:    mov    %ebx,-0x8(%ebp)

Andreas
-- 
 Andreas Jaeger, Program Manager openSUSE,  aj@{novell.com,opensuse.org}
  Twitter: jaegerandi | Identica: jaegerandi
   SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
    Maxfeldstr. 5, 90409 Nürnberg, Germany
     GPG fingerprint = 93A3 365E CE47 B889 DF7F  FED1 389A 563C C272 A126