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Date: Tue, 11 Nov 2014 07:38:33 +0200
From: Samuli Suominen <ssuominen@gentoo.org>
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Subject: Re: [gentoo-user] glibc-2.20 and intel microcode
References: <2152323.9pxBxE1bey@gentoo>
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On 11/11/14 05:49, microcai@fedoraproject.org wrote:
> I've finnally detected the root cause of glibc-2.20 broken my system: 
> glibc-2.20 start using TLX instruction which is disabled by microcode update.
>
> disabling microcode update brings my system back to live!
>
> so, there is either a bug in CPU , nor glibc has borken CPU feature detection.
>
>
>

See, http://bugs.gentoo.org/show_bug.cgi?id=528712
It's likely you are hitting a kernel bug