From mboxrd@z Thu Jan  1 00:00:00 1970
From: Felipe Contreras <felipe.contreras@gmail.com>
Subject: Re: [PATCH 11/13] ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)
Date: Sun, 4 Aug 2013 23:16:47 -0500
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References: <20130513151631.GA6215@redhat.com>
	<20130513151737.GA6297@redhat.com>
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To: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@elte.hu>, Jan Kratochvil <jan.kratochvil@redhat.com>, Michael Neuling <mikey@neuling.org>, Paul Mackerras <paulus@samba.org>, Paul Mundt <lethal@linux-sh.org>, Prasad <prasad@linux.vnet.ibm.com>, Russell King <linux@arm.linux.org.uk>, Will Deacon <will.deacon@arm.com>, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org

On Mon, May 13, 2013 at 10:17 AM, Oleg Nesterov <oleg@redhat.com> wrote:
> Change ptrace_detach() to call flush_ptrace_hw_breakpoint(child).
> This frees the slots for non-ptrace PERF_TYPE_BREAKPOINT users, and
> this ensures that the tracee won't be killed by SIGTRAP triggered by
> the active breakpoints.

There is something wrong with this patch. I've bisected an issue I've
seen in v3.11-rcx kernels while running Starcraft II through wine,
it's crashes 100% of the time, I revert this patch, and there's no
crash any more.

-- 
Felipe Contreras