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Date: Tue, 10 Dec 2013 21:35:59 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
        Dave Jones <davej@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Darren Hart <dvhart@linux.intel.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, Mel Gorman <mgorman@suse.de>
Subject: Re: process 'stuck' at exit.
Message-ID: <20131210203559.GA1209@redhat.com>
References: <20131210154724.GA30020@redhat.com> <CA+55aFxgFAfcQKDoDhmJcCRb5pfxumxJ9OmpUhhNzs+CY_Yqqw@mail.gmail.com> <alpine.DEB.2.02.1312102001090.28330@ionos.tec.linutronix.de> <CA+55aFzLnheC6W+Db=-MVr6aR5UzP-c1Q1yk_aN-9gxSjUpANw@mail.gmail.com>
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Dave, I must have missed something, help.

I am looking at the first message and I can't understand who stuck
"at exit".

The trace shows that the task with pid=10818 called sys_futex() ?

Perhaps "exit" means the userspace paths?

Oleg.