linux-kernel - Re: oops in tracepoint_update_probe

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Message-ID: <alpine.DEB.2.00.0903191219260.16987@gandalf.stny.rr.com>
Date:	Thu, 19 Mar 2009 12:20:30 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Ingo Molnar <mingo@...e.hu>, Rusty Russell <rusty@...tcorp.com.au>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: oops in tracepoint_update_probe_range()


On Thu, 19 Mar 2009, Mathieu Desnoyers wrote:

> * Ingo Molnar (mingo@...e.hu) wrote:
> > 
> > * Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > On Thu, 19 Mar 2009, Mathieu Desnoyers wrote:
> > > > 
> > > > Jaswinder : maybe you have old modules in your /lib/modules/`uname -r`
> > > > directory which have the correct version, but the wrong module.h header ?
> > > 
> > > Isn't there a module versioning that prevents such things?
> > 
> > It can be overriden. In any case, the NULL check we have there now 
> > makes sense.
> > 
> > 	Ingo
> 
> Well, it duplicates the check for begin == end. Actually, if begin !=
> end _and_ being is NULL, this should be a WARN_ON or BUG_ON, because
> the kernel would be trying to load a module with incompatible struct
> module.
> 
> Are we supposed to assume that module.c allows loading modules with
> incompatible struct module at all ? That sounds like we would be trying
> to fix up things broken by the module loader in the first place.

Then it should be WARN_ON, no need to lock up a box hard, and give the 
user in X with no serial, no idea why the box just locked up.

-- Steve

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