Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932097AbbGVHhf (ORCPT ); Wed, 22 Jul 2015 03:37:35 -0400 Received: from mail4.hitachi.co.jp ([133.145.228.5]:57550 "EHLO mail4.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755877AbbGVHhd (ORCPT ); Wed, 22 Jul 2015 03:37:33 -0400 X-AuditID: 85900ec0-9afc5b9000001a57-90-55af48125b37 X-Mailbox-Line: From nobody Wed Jul 22 11:14:21 2015 Subject: [PATCH 0/3] x86: Fix panic vs. NMI issues To: Jonathan Corbet , Peter Zijlstra , Ingo Molnar , "Eric W. Biederman" , "H. Peter Anvin" , Andrew Morton , Thomas Gleixner , Vivek Goyal From: Hidehiro Kawai Cc: Masami Hiramatsu , x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Date: Wed, 22 Jul 2015 11:14:21 +0900 Message-ID: <20150722021421.5155.74460.stgit@softrs> User-Agent: StGit/0.16 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1476 Lines: 40 When an HA cluster software or administrator detects non-response of a host, they issue an NMI to the host to completely stop current works and take a crash dump. If the kernel has already panicked or is capturing a crash dump at that time, further NMI can cause a crash dump failure. To solve this issue, this patch set does two things: - Don't panic on NMI if the kernel has already panicked - Introduce "noextnmi" boot option which masks external NMI at the boot time (supported only for x86) --- Hidehiro Kawai (3): x86/panic: Fix re-entrance problem due to panic on NMI kexec: Fix race between panic() and crash_kexec() directly called x86/apic: Introduce noextnmi boot option Documentation/kernel-parameters.txt | 4 ++++ arch/x86/kernel/apic/apic.c | 17 +++++++++++++++- arch/x86/kernel/nmi.c | 18 +++++++++++------ include/linux/kernel.h | 4 ++++ include/linux/kexec.h | 2 ++ kernel/kexec.c | 12 ++++++++++- kernel/panic.c | 37 ++++++++++++++++++++++++++--------- 7 files changed, 76 insertions(+), 18 deletions(-) -- Hidehiro Kawai Hitachi, Ltd. Research & Development Group -- 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/