On Wed, 26 Jun 2019 16:44:45 +0200 (CEST)
Thomas Gleixner wrote:
> >
> > It should be enough to fix the original problem because
> > x86 is the only architecture that calls set_all_modules_text_rw()
> > in ftrace path and supports livepatching at the same time.
>
> Looks correct, but I've pag
On Wed, Jun 26, 2019 at 04:44:45PM +0200, Thomas Gleixner wrote:
> On Wed, 26 Jun 2019, Petr Mladek wrote:
> > On Wed 2019-06-26 10:22:45, Miroslav Benes wrote:
> > It is similar problem that has been solved by 2d1e38f56622b9bb5af8
> > ("kprobes: Cure hotplug lock ordering issues"). This commit sol
On Wed, 26 Jun 2019, Petr Mladek wrote:
> On Wed 2019-06-26 10:22:45, Miroslav Benes wrote:
> It is similar problem that has been solved by 2d1e38f56622b9bb5af8
> ("kprobes: Cure hotplug lock ordering issues"). This commit solved
> it by always taking cpu_hotplug_lock.rw_sem before text_mutex insid
On Wed 2019-06-26 10:22:45, Miroslav Benes wrote:
> On Fri, 14 Jun 2019, Steven Rostedt wrote:
>
> > On Thu, 13 Jun 2019 20:07:22 -0500
> > Josh Poimboeuf wrote:
> >
> > > It's possible for livepatch and ftrace to be toggling a module's text
> > > permissions at the same time, resulting in the f
On Fri, 14 Jun 2019, Steven Rostedt wrote:
> On Thu, 13 Jun 2019 20:07:22 -0500
> Josh Poimboeuf wrote:
>
> > It's possible for livepatch and ftrace to be toggling a module's text
> > permissions at the same time, resulting in the following panic:
> >
>
> [..]
>
> > The above panic occurs whe
On Thu, 13 Jun 2019 20:07:22 -0500
Josh Poimboeuf wrote:
> It's possible for livepatch and ftrace to be toggling a module's text
> permissions at the same time, resulting in the following panic:
>
[..]
> The above panic occurs when loading two modules at the same time with
> ftrace enabled, wh
It's possible for livepatch and ftrace to be toggling a module's text
permissions at the same time, resulting in the following panic:
BUG: unable to handle page fault for address: c005b1d9
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
P
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