linux-kernel - Re: RCU bug with v3.17-rc3 ?

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Message-ID: <20141009214706.GC4606@drone.musicnaut.iki.fi>
Date:	Fri, 10 Oct 2014 00:47:06 +0300
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Rabin Vincent <rabin@....in>
Cc:	Felipe Balbi <balbi@...com>, Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>, josh@...htriplett.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: RCU bug with v3.17-rc3 ?

Hi,

On Thu, Oct 09, 2014 at 10:41:01PM +0200, Rabin Vincent wrote:
>   What GCC version are you using?
>   
>   4.8.1 and 4.8.2 are known to miscompile the ARM kernel and these
>   find_get_entry() crashes with 0xffffffff involved smell a lot like the
>   earlier reports from kernels build with those compilers:
>   
>   https://lkml.org/lkml/2014/6/25/456
>   https://lkml.org/lkml/2014/6/30/375
>   https://lkml.org/lkml/2014/6/30/660
>   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
>   https://lkml.org/lkml/2014/5/9/330

Is it possible to blacklist those GCC versions on ARM somehow as it
seems people are still using them?

This bug also ruined a file system on one of my boxes last year
(see e.g. http://marc.info/?l=linux-arm-kernel&m=139033442527244&w=2).

A.
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