linux-kernel - v4.16+ seeing many unaligned access in dequeue_task

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Message-ID: <20180402232448.fbop7k5xicblski5@agluck-desk>
Date:   Mon, 2 Apr 2018 16:24:49 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Norbert Manthey <nmanthey@...zon.de>,
        Frederic Weisbecker <frederic@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: v4.16+ seeing many unaligned access in dequeue_task_fair() on IA64

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