From: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
To: Jonathan Corbet <corbet@lwn.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Vivek Goyal <vgoyal@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
x86@kernel.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: [PATCH 0/3] x86: Fix panic vs. NMI issues
Date: Wed, 22 Jul 2015 11:14:21 +0900 [thread overview]
Message-ID: <20150722021421.5155.74460.stgit@softrs> (raw)
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
next reply other threads:[~2015-07-22 7:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-22 2:14 Hidehiro Kawai [this message]
2015-07-22 2:14 ` [PATCH 2/3] kexec: Fix race between panic() and crash_kexec() directly called Hidehiro Kawai
2015-07-22 2:14 ` [PATCH 1/3] x86/panic: Fix re-entrance problem due to panic on NMI Hidehiro Kawai
2015-07-23 8:15 ` Peter Zijlstra
2015-07-23 9:43 ` Hidehiro Kawai
2015-07-22 2:14 ` [PATCH 3/3] x86/apic: Introduce noextnmi boot option Hidehiro Kawai
2015-07-23 8:25 ` [PATCH 0/3] x86: Fix panic vs. NMI issues Michal Hocko
2015-07-23 10:11 ` Hidehiro Kawai
2015-07-23 11:25 ` Michal Hocko
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