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Date: Mon, 2 Apr 2018 16:24:49 -0700
From: "Luck, Tony" <tony.luck@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Patrick Bellasi <patrick.bellasi@arm.com>,
        Ingo Molnar <mingo@kernel.org>, Norbert Manthey <nmanthey@amazon.de>,
        Frederic Weisbecker <frederic@kernel.org>,
        linux-kernel@vger.kernel.org
Subject: v4.16+ seeing many unaligned access in dequeue_task_fair() on IA64
Message-ID: <20180402232448.fbop7k5xicblski5@agluck-desk>
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v4.16 boots cleanly. But with the first bunch of merges
(Linus HEAD = 46e0d28bdb8e6d00e27a0fe9e1d15df6098f0ffb)
I see a bunch of:

ia64_handle_unaligned: 4863 callbacks suppressed
kernel unaligned access to 0xe00000031660fd74, ip=0xa0000001000f23e0
kernel unaligned access to 0xe00000033bdffbcc, ip=0xa0000001000f2370
kernel unaligned access to 0xe00000031660fd74, ip=0xa0000001000f23e0
kernel unaligned access to 0xe00000033bdffbcc, ip=0xa0000001000f2370
kernel unaligned access to 0xe00000031660fd74, ip=0xa0000001000f23e0

The addresses are all 4-byte, but not 8-byte aligned.

Any guesses before I start to bisect?

-Tony