From: Felipe Contreras <felipe.contreras@gmail.com>
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
Subject: Re: [PATCH 11/13] ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)
Date: Sun, 4 Aug 2013 23:16:47 -0500 [thread overview]
Message-ID: <CAMP44s0iX_CRbCWWbrPURqKM+ksjG+8KFS56isSDG2Vs4CLjOQ@mail.gmail.com> (raw)
In-Reply-To: <20130513151737.GA6297@redhat.com>
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
next prev parent reply other threads:[~2013-08-05 4:16 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-13 15:16 [PATCH 0/13] ptrace/hw_breakpoint cleanups/fixes Oleg Nesterov
2013-05-13 15:16 ` Oleg Nesterov
2013-05-13 15:16 ` [PATCH 01/13] ptrace/x86: Revert "hw_breakpoints: Fix racy access to ptrace breakpoints" Oleg Nesterov
2013-05-13 15:16 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 02/13] ptrace/powerpc: " Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 03/13] ptrace/arm: " Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 04/13] ptrace/sh: " Oleg Nesterov
2013-05-13 15:17 ` [PATCH 05/13] ptrace: Revert "Prepare to fix racy accesses on task breakpoints" Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 06/13] ptrace/x86: simplify the "disable" logic in ptrace_write_dr7() Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 07/13] ptrace/x86: dont delay "disable" till second pass " Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 08/13] ptrace/x86: introduce ptrace_register_breakpoint() Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 09/13] ptrace/x86: ptrace_write_dr7() should create bp if !disabled Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 10/13] ptrace/x86: cleanup ptrace_set_debugreg() Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
2013-05-13 15:17 ` [PATCH 11/13] ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child) Oleg Nesterov
2013-08-05 4:16 ` Felipe Contreras [this message]
2013-05-13 15:17 ` [PATCH 12/13] ptrace/x86: flush_ptrace_hw_breakpoint() shoule clear the virtual debug registers Oleg Nesterov
2013-05-13 15:17 ` [PATCH 13/13] x86: kill TIF_DEBUG Oleg Nesterov
2013-05-13 15:17 ` Oleg Nesterov
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