From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754250Ab3KAN5A (ORCPT ); Fri, 1 Nov 2013 09:57:00 -0400 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.226]:51287 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753801Ab3KAN45 (ORCPT ); Fri, 1 Nov 2013 09:56:57 -0400 Date: Fri, 1 Nov 2013 09:56:54 -0400 From: Steven Rostedt To: Masami Hiramatsu Cc: Ingo Molnar , Fenghua Yu , Seiji Aguchi , Ananth N Mavinakayanahalli , x86@kernel.org, lkml , Ingo Molnar , "H. Peter Anvin" , Thomas Gleixner , Borislav Petkov Subject: Re: [PATCH -tip v2 2/3] [BUGFIX] kprobes/x86: Prohibit probing on debug_stack_* Message-ID: <20131101095654.37db1b24@gandalf.local.home> In-Reply-To: <20131101112534.14657.22729.stgit@kbuild-fedora.novalocal> References: <20131101112530.14657.87835.stgit@kbuild-fedora.novalocal> <20131101112534.14657.22729.stgit@kbuild-fedora.novalocal> X-Mailer: Claws Mail 3.9.2 (GTK+ 2.24.20; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.118:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 01 Nov 2013 11:25:34 +0000 Masami Hiramatsu wrote: > Prohibit probing on debug_stack_reset and debug_stack_set_zero. > Since the both functions are called from TRACE_IRQS_ON/OFF_DEBUG > macros which run in int3 ist entry, probing it may cause a soft > lockup. > > This happens when the kernel built with CONFIG_DYNAMIC_FTRACE=y > and CONFIG_TRACE_IRQFLAGS=y. > > Signed-off-by: Masami Hiramatsu > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: "H. Peter Anvin" > Cc: Borislav Petkov > Cc: Fenghua Yu > Cc: Seiji Aguchi > --- Acked-by: Steven Rostedt -- Steve