linux-kernel - Re: [RFC v4] debug: prevent entering debug mode on panic/exception.

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Date:	Mon, 5 Jan 2015 16:14:12 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kiran Raparthy <kiran.kumar@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Colin Cross <ccross@...roid.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [RFC v4] debug: prevent entering debug mode on panic/exception.

On Tue, 23 Dec 2014 18:08:29 +0530 Kiran Raparthy <kiran.kumar@...aro.org> wrote:

> From: Colin Cross <ccross@...roid.com>
> 
> debug: prevent entering debug mode on panic/exception.
> 
> On non-developer devices, kgdb prevents the device from rebooting
> after a panic.
> 
> Incase of panics and exceptions, to allow the device to reboot, prevent
> entering debug mode to avoid getting stuck waiting for the user to interact
> with debugger.
> 
> To avoid entering the debugger on panic/exception without any extra
> configuration, panic_timeout is being used which can be set via
> /proc/sys/kernel/panic at run time and CONFIG_PANIC_TIMEOUT sets the default
> value.
> 
> ...
>

hm.  Why overload the meaning of panic_timeout in this fashion?  If
someone is using kgdb and has panic_timeout set, they'll get quiet a
surprise.

Would it be cleaner/clearer to add some new standalone control for
this?  One which is only present if CONFIG_KGDB.


We appear to have forgotten to document panic_timeout.  Sigh.
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