Messages in this thread | | | Date | Wed, 26 Feb 2020 19:59:45 +0100 | From | Peter Zijlstra <> | Subject | Re: [patch 02/10] x86/mce: Disable tracing and kprobes on do_machine_check() |
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On Wed, Feb 26, 2020 at 07:42:37PM +0100, Borislav Petkov wrote: > On Wed, Feb 26, 2020 at 09:28:51AM -0800, Andy Lutomirski wrote: > > > It entirely depends on what the goal is :-/ On the one hand I see why > > > people might want function tracing / kprobes enabled, OTOH it's all > > > mighty frigging scary. Any tracing/probing/whatever on an MCE has the > > > potential to make a bad situation worse -- not unlike the same on #DF. > > FWIW, I had this at the beginning of the #MC handler in a feeble attempt > to poke at this: > > + hw_breakpoint_disable(); > + static_key_disable(&__tracepoint_read_msr.key); > + tracing_off();
You can't do static_key_disable() from an IST
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