Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756518Ab2BHRhh (ORCPT ); Wed, 8 Feb 2012 12:37:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45710 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751409Ab2BHRhf (ORCPT ); Wed, 8 Feb 2012 12:37:35 -0500 Date: Wed, 8 Feb 2012 18:31:03 +0100 From: Oleg Nesterov To: Pedro Alves Cc: Cyrill Gorcunov , Pavel Emelyanov , Jan Kratochvil , Tejun Heo , Andrew Vagin , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] ptrace: add ability to get clear_tid_address Message-ID: <20120208173103.GA20853@redhat.com> References: <1328267483-3225342-1-git-send-email-avagin@openvz.org> <20120203162519.GB805@google.com> <4F2C0F13.70709@parallels.com> <20120203165132.GA5636@redhat.com> <4F31848A.9070406@redhat.com> <20120207205639.GJ27437@moon> <4F31945B.5000304@redhat.com> <20120207215121.GB29773@moon> <4F326AF7.3060203@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4F326AF7.3060203@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 664 Lines: 17 On 02/08, Pedro Alves wrote: > > I just tried it. This is &pthread->tid in glibc/libpthread, so with debug > info it's easy to figure out where to set the watchpoint manually with gdb > without asking the kernel. Doesn't work. ptrace doesn't show any trap > for the kernel writes. The tracee simply can't report this trap. it is already dead ;) and hw breakpoint (used by ptrace) is "pinned" to the thread. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/