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

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Date:	Fri, 6 Sep 2013 11:22:21 -0400
From:	Dave Jones <davej@...hat.com>
To:	Kyle McMartin <kyle@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: ftrace 'failed to modify' bug when loading reiserfs.ko

On Fri, Sep 06, 2013 at 10:41:13AM -0400, Kyle McMartin wrote:
 > 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.

Ugh, it's actually because my local install kernel script calls
grub2-mkconfig after installing a kernel to clean out old ones and not
clutter up the boot menu. (Which in turn scans every disk using os-prober[*])

Don't waste time on this Steve, I'll just work around it somehow.

	Dave

[*] Worst thing.

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