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Message-ID: <d751a5dd17550b21f890e3efcf70d5228451767d.camel@HansenPartnership.com>
Date: Tue, 16 Nov 2021 08:20:57 -0500
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Petr Mladek <pmladek@...e.com>, Alexander Popov <alex.popov@...ux.com>
Cc: Gabriele Paoloni <gpaoloni@...hat.com>, Lukas Bulwahn
<lukas.bulwahn@...il.com>, Robert Krutsch <krutsch@...il.com>, Linus
Torvalds <torvalds@...ux-foundation.org>, Jonathan Corbet <corbet@....net>,
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<tsbogend@...ha.franken.de>, Mike Rapoport <rppt@...nel.org>, Bjorn
Andersson <bjorn.andersson@...aro.org>, Kernel Hardening
<kernel-hardening@...ts.openwall.com>, linux-hardening@...r.kernel.org,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, linux-arch
<linux-arch@...r.kernel.org>, Linux Kernel Mailing List
<linux-kernel@...r.kernel.org>, linux-fsdevel
<linux-fsdevel@...r.kernel.org>, notify@...nel.org, main@...ts.elisa.tech,
safety-architecture@...ts.elisa.tech, devel@...ts.elisa.tech, Shuah Khan
<shuah@...nel.org>
Subject: Re: [ELISA Safety Architecture WG] [PATCH v2 0/2] Introduce the
pkill_on_warn parameter
On Tue, 2021-11-16 at 09:41 +0100, Petr Mladek wrote:
[...]
> If I wanted to implement a super-reliable panic() I would
> use some external device that would cause power-reset when
> the watched device is not responding.
They're called watchdog timers. We have a whole subsystem full of
them:
drivers/watchdog
We used them in old cluster HA systems to guarantee successful recovery
of shared state from contaminated cluster members, but I think they'd
serve the reliable panic need equally well. Most server class systems
today have them built in (on the BMC if they don't have a separate
mechanism), they're just not usually activated.
James
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