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Date:	Sun, 15 Dec 2013 20:33:45 +0100
From:	Sebastian Andrzej Siewior <>
To:	Ben Hutchings <>
CC:	Thomas Gleixner <>,
	Peter Zijlstra <>,
	Steven Rostedt <>,, Brian Silverman <>,
	LKML <>
Subject: Re: Double fault when single-stepping compat task with PREEMPT_RT

On 09/25/2013 03:24 PM, Ben Hutchings wrote:
> On Tue, 2013-09-24 at 13:43 -0700, Brian Silverman wrote: [...]
>> I got down to a really simple program that reproduces this bug:
>> #include <sys/syscall.h> #include <unistd.h> int main() { // I've
>> tried SYS_getpid, SYS_write, and SYS_read here too. 
>> syscall(SYS_gettid); }

Brian, thank you for this excellent stripped down test case.
I think I know what is going on, will dig more later.

> Ben.

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