linux-kernel - Re: 3.13: BUG: unable to handle kernel paging request at 00000000b4343e88

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Date:	Thu, 6 Feb 2014 08:19:05 +0200 (EET)
From:	Meelis Roos <mroos@...ux.ee>
To:	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: 3.13: BUG: unable to handle kernel paging request at
 00000000b4343e88

> > Using your config I was able to reproduce the crash and locate the
> > cause. Commit d61931d89b, "x86: Add optimized popcnt variants" adds
> > option -fcall-saved-rdi to the compile flags of lib/hweight.c when
> > compiling for x86_64. Together with options --coverage and -O2, this
> > results in a broken constructor being generated by GCC for this object
> > file which in turn causes __gcov_init() to overwrite random memory
> > locations (a mutex in your case).
> 
> Could you give this patch a try? It is a variation of the approach
> proposed in the discussion mentioned earlier and fixes the problem
> on my system.

It works for me too - the machine booted up with no problem.

-- 
Meelis Roos (mroos@...ux.ee)
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