linux-kernel - [PATCH 0/2] sched/wait: abort_exclusive_wait() should pass TASK_NORMAL to wake

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Message-ID: <20160826124453.GA28894@redhat.com>
Date:   Fri, 26 Aug 2016 14:44:53 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Al Viro <viro@...IV.linux.org.uk>,
        Bart Van Assche <bvanassche@....org>,
        Johannes Weiner <hannes@...xchg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] sched/wait: abort_exclusive_wait() should pass
 TASK_NORMAL to wake_up()

To clarify, this can't fix the lock_page() hang reported by Bart,
__wait_on_bit_lock() is fine even if abort_exclusive_wait() is buggy.

Still should be fixed I think. And perhaps we should simply kill
abort_exclusive_wait() ? See 2/2.

And this reminds me... I still fail to understand why/how the commit
68985633bccb60 "sched/wait: Fix signal handling in bit wait helpers"
can help. Apart from s/return 1/return -EINTR/. Peter, do you have any
theory?

Oleg.