Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registeredy

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registeredy
Date	2015-12-10 22:00 +0100
Message-ID	<qEgtI-2KO-23@gated-at.bofh.it> (permalink)
References	<qE3G9-2Ub-5@gated-at.bofh.it> <qEeBz-1xO-5@gated-at.bofh.it> <qEeLg-1Qp-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, 10 Dec 2015, Andy Lutomirski wrote:
> On brief inspection, this smells like a microcode bug.  Can you send
> /proc/cpuinfo output?
> 
> If this is the issue, I'm not sure we want to be in the business of
> working around localized microcode bugs and, if we do, then I think we
> should explicitly detect the bug and log about it.

I think we should handle such stuff gracefully. Yes, we should log it
and we also should check what the contents of the debug registers are.

If dr7 has a break point enabled w/o perf having one installed then we
know that someone did a horrible hackery ....

Thanks,

	tglx


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Thread

[PATCH 1/1] Fix int1 recursion when no perf_bp_event is registered Jeff Merkey <linux.mdb@gmail.com> - 2015-12-10 08:20 +0100
  Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is  registered Thomas Gleixner <tglx@linutronix.de> - 2015-12-10 20:00 +0100
    Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registered Andy Lutomirski <luto@amacapital.net> - 2015-12-10 20:10 +0100
      Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is  registered Jiri Olsa <jolsa@redhat.com> - 2015-12-10 20:30 +0100
        Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is  registered Borislav Petkov <bp@alien8.de> - 2015-12-10 20:30 +0100
      Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is  registeredy Thomas Gleixner <tglx@linutronix.de> - 2015-12-10 22:00 +0100
        Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registeredy Andy Lutomirski <luto@amacapital.net> - 2015-12-10 22:10 +0100
          Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is  registeredy Thomas Gleixner <tglx@linutronix.de> - 2015-12-10 22:20 +0100
            Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registeredy Jeff Merkey <linux.mdb@gmail.com> - 2015-12-10 22:30 +0100
          Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registeredy Jeff Merkey <linux.mdb@gmail.com> - 2015-12-10 22:20 +0100
        Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registeredy Jeff Merkey <linux.mdb@gmail.com> - 2015-12-10 22:20 +0100
        Re: [PATCH 1/1] Fix int1 recursion when no perf_bp_event is registeredy Jeff Merkey <linux.mdb@gmail.com> - 2015-12-10 23:30 +0100
        Re: [PATCH v2 1/1] Fix int1 recursion when no perf_bp_event is registeredy Jeff Merkey <linux.mdb@gmail.com> - 2015-12-11 09:10 +0100
          Re: [PATCH v2 1/1] Fix int1 recursion when no perf_bp_event is registeredy Jeff Merkey <linux.mdb@gmail.com> - 2015-12-11 20:10 +0100

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