linux-kernel - Re: deadlock in scheduler enabling HRTICK feature

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Message-ID: <20130625211713.GA18796@laptop.programming.kicks-ass.net>
Date:	Tue, 25 Jun 2013 23:17:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: deadlock in scheduler enabling HRTICK feature

On Tue, Jun 25, 2013 at 03:05:38PM -0600, David Ahern wrote:
> Peter/Ingo:
> 
> I can reliably cause a deadlock in the scheduler by enabling the HRTICK
> feature. I first hit the problem with 2.6.27 but have been able to reproduce
> it with newer kernels. I have not tried top of Linus' tree, so perhaps this
> has been fixed in 3.10. 

Yeah, I know.. its been on the todo list forever but its never been
important. Its disabled by default and all sched debug features are for
those brave enough to keep the pieces ;-)
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