[stable] sctp: Prevent soft lockup when sctp_accept() is called during a timeout event

[Ben Hutchings <ben@xxxxxxxxxxxxxxx>]

This commit should probably be cherry-picked for stable branches:

commit 635682a14427d241bab7bbdeebb48a7d7b91638e
Author: Karl Heiss <kheiss@xxxxxxxxx>
Date:   Thu Sep 24 12:15:07 2015 -0400

    sctp: Prevent soft lockup when sctp_accept() is called during a timeout event

Ben.

-- 
Ben Hutchings
Theory and practice are closer in theory than in practice.
                                - John Levine, moderator of comp.compilers

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