From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>,
Joel Fernandes <joel@joelfernandes.org>,
Peter Zijlstra <peterz@infradead.org>,
Namhyung Kim <namhyung@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux- stable <stable@vger.kernel.org>,
Sasha Levin <sashal@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
LTP List <ltp@lists.linux.it>,
lkft-triage@lists.linaro.org
Subject: Re: [stable 4.19] [PANIC]: tracing: Centralize preemptirq tracepoints and unify their usage
Date: Fri, 25 Sep 2020 17:12:45 +0200 [thread overview]
Message-ID: <20200925151245.GA3180934@kroah.com> (raw)
In-Reply-To: <20200925110706.6654954b@oasis.local.home>
On Fri, Sep 25, 2020 at 11:07:06AM -0400, Steven Rostedt wrote:
> On Fri, 25 Sep 2020 10:59:14 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > On Fri, 25 Sep 2020 10:54:58 -0400
> > Steven Rostedt <rostedt@goodmis.org> wrote:
> >
> >
> > > The crash looks like its cr3 related, which I believe Peter Zijlstra
> >
> > s/cr3/cr2/
> >
>
> Specifically, commits:
>
> a0d14b8909de55139b8702fe0c7e80b69763dcfb ("x86/mm, tracing: Fix CR2 corruption")
> 6879298bd0673840cadd1fb36d7225485504ceb4 ("x86/entry/64: Prevent clobbering of saved CR2 value")
> b8f70953c1251d8b16276995816a95639f598e70 ("x86/entry/32: Pass cr2 to do_async_page_fault()")
>
> (which are in 5.4 but not 4.19)
>
> But again, is this too intrusive. There was a workaround that was
> original proposed, but Peter didn't want any more band-aids, and did
> the restructuring, but as you can see from the two other patches, it
> makes it a bit more high risk.
If those are known to work, why can't I take them as-is?
thanks,
greg k-h
next prev parent reply other threads:[~2020-09-25 15:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-23 2:38 [lkp-robot] [tracing] c3bc8fd637: WARNING:at_kernel/rcu/tree.c:#rcu_irq_enter kernel test robot
2018-08-28 19:53 ` Joel Fernandes
2020-09-25 4:43 ` [stable 4.19] [PANIC]: tracing: Centralize preemptirq tracepoints and unify their usage Naresh Kamboju
2020-09-25 5:15 ` Greg Kroah-Hartman
2020-09-25 7:25 ` Naresh Kamboju
2020-09-25 14:54 ` Steven Rostedt
2020-09-25 14:59 ` Steven Rostedt
2020-09-25 15:07 ` Steven Rostedt
2020-09-25 15:12 ` Greg Kroah-Hartman [this message]
2020-09-25 15:30 ` Steven Rostedt
2020-10-05 13:18 ` Greg Kroah-Hartman
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