linux-kernel - Re: [PATCH] debug: Deprecate BUG_ON() use in new code, introduce CRASH

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Message-ID: <20150608112917.GB20511@gmail.com>
Date:	Mon, 8 Jun 2015 13:29:17 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexander Holler <holler@...oftware.de>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <htejun@...il.com>,
	Louis Langholtz <lou_langholtz@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Trivial patch monkey <trivial@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] debug: Deprecate BUG_ON() use in new code, introduce
 CRASH_ON()


* Alexander Holler <holler@...oftware.de> wrote:

> > Also note that BUG_ON() will make data corruption _worse_ statistically. Why? 
> > Because most data corruptions are unlikely to be perfectly detected by a 
> > BUG_ON(), and the BUG_ON() delays the finding of the underlying bug, so the 
> > bug will hit more people before it's fixed for good.
> >
> > So even in the cases where you could argue that the system needs to stop, 
> > because we have evidence of data corruption, it's statistically the better 
> > approach to continue and get kernel log info back to developers.
> 
> Risking more, maybe even worse problems like corrupting file systems or similiar 
> in order to have a slightly chance of save log info?

That's not what I said - please read my argument and argue with that if you want, 
not with some other straw-man argument...

Thanks,

	Ingo
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