linux-kernel - Re: ftrace 'failed to modify' bug when loading reiserfs.ko

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Message-ID: <20130906102413.2e52d337@gandalf.local.home>
Date:	Fri, 6 Sep 2013 10:24:13 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: ftrace 'failed to modify' bug when loading reiserfs.ko

On Fri, 6 Sep 2013 10:18:52 -0400
Dave Jones <davej@...hat.com> wrote:


>  > > 00000000000028b0 <reiserfs_init_bitmap_cache>:
>  > > 
>  > >         return bh;
>  > > }
>  > > 
>  > > int reiserfs_init_bitmap_cache(struct super_block *sb)
>  > > {
>  > >     28b0:       e8 00 00 00 00          callq  28b5 <reiserfs_init_bitmap_cache+0x5>
>  > 
>  > That looks to be the call to fentry, but without being resolved. What
>  > we saw in the previous report wasn't 0xe8 but 0x14, and it was
>  > unresolved after loading!
>  > 
>  > I'm surprised that the module built with a different
>  > DEBUG_KOBJECT_RELEASE config would load. Does it not affect module
>  > versions?
>  
> # CONFIG_MODVERSIONS is not set
> 

Is it really safe to load modules that were compiled with different
options? Sounds like a failure in the install scripts to me.

Anyway, if you can send me the binary file, I can take a deeper look at
it.

-- Steve
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