linux-kernel - Request for help: what did I do wrong with idtentry?

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Message-ID: <CALCETrXdaEYjjfsTYySDXZvBHON10-EQRftV-OSCWTKMsUfOtg@mail.gmail.com>
Date:	Fri, 14 Nov 2014 14:25:34 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Request for help: what did I do wrong with idtentry?

This patch:

https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/paranoid&id=5b58c7ac3034a8d62e42a6ca91c7a95e887542e7

which is functionally identical to:

http://lkml.kernel.org/g/76efedcd3622e61feb2982eabe52a6bf531396a9.1415917623.git.luto@amacapital.net

causes Tony's MCE stress test to fail, presumably when some CPU either
becomes permanently non-interruptable or otherwise wanders off into
the weeds.

Could any of you take a quick look and see if anything stands out?
I'm a bit stuck, since I don't have hardware that can run the stress
test, and I can't reproduce any problems with this patch at all.

Thanks,
Andy
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