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From: microcai@fedoraproject.org
To: gentoo-user@lists.gentoo.org, gentoo-dev@lists.gentoo.org
Subject: [gentoo-user] glibc-2.20 and intel microcode
Date: Tue, 11 Nov 2014 11:49:17 +0800
Message-ID: <2152323.9pxBxE1bey@gentoo>
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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.