linux-kernel - Re: crash failure with 2.6.36-rc3 vmcore

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Date:	Sat, 4 Sep 2010 07:43:44 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	CAI Qian <caiqian@...hat.com>
CC:	Dave Anderson <anderson@...hat.com>,
	"tj@...nel.org" <tj@...nel.org>, "gregkh@...e.de" <gregkh@...e.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: crash failure with 2.6.36-rc3 vmcore

Hi,

On Sat, Sep 04, 2010 at 02:01:06AM -0400, CAI Qian wrote:
> 
> > crash> mod -S
> > 
> > mod: invalid structure member offset: attribute_owner
> >      FILE: symbols.c  LINE: 8577  FUNCTION: add_symbol_file_kallsyms()
> > 
> >      MODULE       NAME                   SIZE  OBJECT FILE
> > ffffffffa000de60  dm_mod                76230 
> > /lib/modules/2.6.36-rc2-mm1-wqfix-mkdfix+/kernel/drivers/md/dm-mod.ko
> > [/usr/bin/crash] error trace: 4affb0 => 4f3236 => 4f12b5 => 4e587a
> > 
> >   4e587a: OFFSET_verify.clone.4+186
> >   4f12b5: add_symbol_file+933
> >   4f3236: load_module_symbols+566
> >   4affb0: do_module_cmd+1264
> > 
> > mod: invalid structure member offset: attribute_owner
> >      FILE: symbols.c  LINE: 8577  FUNCTION: add_symbol_file_kallsyms()

What do I have to do to reproduce this crash ? 

Was the module in question compiled w/ the kernel, or separately ?
Did it use the correct kernel header files for compilation ?
Was the kernel version -rc3, or some other patched version ?

Just wondering, since the above message says 2.6.36-rc2-mm1-wqfix-mkdfix+,
which seems to indicate that it included some modifications.

Thanks,
Guenter

> This failure was due to this commit,
> 
> commit 6fd69dc578fa0b1bbc3aad70ae3af9a137211707
> Author: Guenter Roeck <guenter.roeck@...csson.com>
> Date:   Wed Jul 28 22:09:26 2010 -0700
> 
>     sysfs: Remove owner field from sysfs struct attribute
>     
>     Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
>     Acked-by: Tejun Heo <tj@...nel.org>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
> index 8bf06b6..3c92121 100644
> --- a/include/linux/sysfs.h
> +++ b/include/linux/sysfs.h
> @@ -22,14 +22,8 @@ struct kobject;
>  struct module;
>  enum kobj_ns_type;
>  
> -/* FIXME
> - * The *owner field is no longer used.
> - * x86 tree has been cleaned up. The owner
> - * attribute is still left for other arches.
> - */
>  struct attribute {
>         const char              *name;
> -       struct module           *owner;
>         mode_t                  mode;
>  #ifdef CONFIG_DEBUG_LOCK_ALLOC
>         struct lock_class_key   *key;
--
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