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

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Message-ID: <20130906144113.GC25882@merlin.infradead.org>
Date:	Fri, 6 Sep 2013 10:41:13 -0400
From:	Kyle McMartin <kyle@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: ftrace 'failed to modify' bug when loading reiserfs.ko

On Fri, Sep 06, 2013 at 10:24:13AM -0400, Steven Rostedt wrote:
> 
> Is it really safe to load modules that were compiled with different
> options?

Certainly not, offsets can change based on config options.

> Sounds like a failure in the install scripts to me.
> 

Definitely a bug in those scripts, os-prober would need to run before
modules_install, since if $INSTALL_MOD_PATH is the same between config
changes, there's no guarantee the modules are loadable on the running
kernel without a reboot.

--Kyle
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