linux-kernel - Re: Double fault when single-stepping compat task with PREEMPT

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Message-ID: <52AE0419.3050103@linutronix.de>
Date:	Sun, 15 Dec 2013 20:33:45 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...tedt.homelinux.com>,
	723180@...s.debian.org, Brian Silverman <bsilver16384@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
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.
> 

Sebastian
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