linux-kernel - Re: process 'stuck' at exit.

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Message-ID: <20131210220941.GA7766@redhat.com>
Date:	Tue, 10 Dec 2013 23:09:41 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Darren Hart <dvhart@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: process 'stuck' at exit.

On 12/10, Linus Torvalds wrote:
>
> So it looks like __get_user_pages_fast() fails, and keeps failing.

And "again:" does get_user_pages_fast().

And according to this trace get_user_pages_fast() takes mmap_sem
and calls __get_user_pages().

But __get_user_pages() should fail even before follow_page_mask()
due to fatal_signal_pending(), in this case get_futex_key() should
return the error. is_vm_hugetlb_page(vma).

So it seems that this is not THP but VM_HUGETLB and
follow_hugetlb_page() succeeds every time?

Oleg.

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