linux-kernel - Re: Oops caused by race between livepatch and ftrace

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Message-ID: <20190522130014.yvkbio62meatqvwf@treble>
Date:   Wed, 22 May 2019 08:00:14 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Johannes Erdfelt <johannes@...felt.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Jessica Yu <jeyu@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Ingo Molnar <mingo@...hat.com>, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Oops caused by race between livepatch and ftrace

On Tue, May 21, 2019 at 11:42:27AM -0500, Josh Poimboeuf wrote:
>  void module_enable_ro(const struct module *mod, bool after_init)
>  {
> +	lockdep_assert_held(&text_mutex);
> +

This assertion fails, it turns out the module code also calls this
function (oops).  I may move the meat of this function to a
__module_enable_ro() which the module code can call.

-- 
Josh