From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from read.uberspace.de (read.uberspace.de [185.26.156.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E73E191 for ; Mon, 12 Aug 2024 17:45:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.26.156.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723484724; cv=none; b=Y2Wh+ovUJh+7dT/+oTjh5RBQDynNE6l9Qvjp2s+2DMu3+rMYyZ3dKDK6DHJby8rdPQSMPH2JW9IxqU1JfX52N0ByWsXwRZOZNQLtWf0ec9TcU8TQOP5LAG/Bhjpqy/zYBUOOquZynZKL6ul41UugOchLFlKP/+mv+iQGAyCcJkk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723484724; c=relaxed/simple; bh=T88emezkzHvFJIY1FU+CWOWblCLzrtTe/ItS1ZINM0A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=CMGyWXoEU07fIruG9WXU6dLzVB1CWJXskiCyQEOi8nAePX3aZn0FOJcnKcUfW7/3k9dCVIaqP9XpipjT4VOLA+BQaT+X6PzHXIREQi9dMUA2qFfvhIM5yCLYg+S0liKcWy7yXKFfUxxjxmtPtlKN+QRpadio3kmF5p2+x5r0hBc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=florommel.de; spf=pass smtp.mailfrom=florommel.de; dkim=pass (4096-bit key) header.d=florommel.de header.i=@florommel.de header.b=omz5qer/; arc=none smtp.client-ip=185.26.156.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=florommel.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=florommel.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=florommel.de header.i=@florommel.de header.b="omz5qer/" Received: (qmail 19526 invoked by uid 990); 12 Aug 2024 17:45:18 -0000 Authentication-Results: read.uberspace.de; auth=pass (plain) Received: from unknown (HELO unkown) (::1) by read.uberspace.de (Haraka/3.0.1) with ESMTPSA; Mon, 12 Aug 2024 19:45:18 +0200 From: Florian Rommel To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Jason Wessel , Daniel Thompson , Douglas Anderson , Lorena Kretzschmar , Stefan Saecherl , Peter Zijlstra , Christophe JAILLET , Randy Dunlap , Masami Hiramatsu , Andrew Morton , Christophe Leroy , Geert Uytterhoeven , kgdb-bugreport@lists.sourceforge.net, x86@kernel.org, linux-kernel@vger.kernel.org Cc: Florian Rommel Subject: [PATCH v2 0/2] kgdb: x86: fix breakpoint removal problems Date: Mon, 12 Aug 2024 19:43:35 +0200 Message-ID: <20240812174338.363838-1-mail@florommel.de> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Bar: / X-Rspamd-Report: SUSPICIOUS_RECIPS(1.5) BAYES_HAM(-2.755498) MID_CONTAINS_FROM(1) MIME_GOOD(-0.1) R_MISSING_CHARSET(0.5) X-Rspamd-Score: 0.144501 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=florommel.de; s=uberspace; h=from:to:cc:subject:date; bh=T88emezkzHvFJIY1FU+CWOWblCLzrtTe/ItS1ZINM0A=; b=omz5qer/TuV+JLZ3OsoXTyeZEB7Yuw0azBeN+c6DIIyjsBYPw4Ja4L2xvMakiQ5+wR0CUysiC1 iAW3UZbSTBiQmLYSQgkBU7NHRQQt8BqXZIsgZg8IpJVplu0mxBgwPZxAT+lJWcbuT9WCX4XlMrMo TYs5fkBbvJ8v7xWGcLIIbRQzF8Qa6lL5CFyl0BVlP5Xh3Zu7tw3rBi/JjDUgPfmWCj5A496asyx8 lxyBOv2I/n2IvjT3WEE47QO7j1+yoYK1fviIUuxrORDqrK+HFd5b+fEqI8X5vNxQwRuH2o7K1jI/ VyqxhVkCdVwbJLdDOC8rf9SOHd5Qh2+VXhX20N38TXqo6p7EMK6BPOy+Yf6UHfV9eQM9AV9tN/0x AvgCEfC55qEFdFwqrm+PRjnW5rQ2sOuZC3p5/Hj2mfSzxwZ1d/YDxUmCLof1KbZOhMogfTvQLbcd 3OsQ2Mx0qBttSc9UfQF0Z1iRMIP0rFJV1A2WUHtdUTRjJuhAR/f8/WOi81s3UNB6nrhAWnl3pYYb IAPIQG4/lxDKWG4oCqDXVsp05iPNzo2wHVXiEk7msdGiagq5PAaZp7zggbjPl51gKy0MUrCfpzND o0MxqqaIZL6GLFLoshdwsgvHwxeLa5p/MPkxN5ZcIW6kpbpAt6iINoh4BKkvyclzWUApZ7I3pT49 k= This series fixes two problems with KGDB on x86 concerning the removal of breakpoints, causing the kernel to hang. Note that breakpoint removal is not only performed when explicitly deleting a breakpoint, but also happens before continuing execution or single stepping. v2: - Add missing stub implementation for kgdb_after_mark_readonly in [1/2] when KGDB disabled - Link to v1: https://lore.kernel.org/all/20240811232208.234261-1-mail@florommel.de/ Florian Rommel (2): x86/kgdb: convert early breakpoints to poke breakpoints x86/kgdb: fix hang on failed breakpoint removal arch/x86/kernel/kgdb.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/kgdb.h | 4 ++++ init/main.c | 1 + kernel/debug/debug_core.c | 7 ++++++- 4 files changed, 49 insertions(+), 1 deletion(-) -- 2.46.0