linux-kernel - Re: [PATCH 06/11] rwsem: wake queued readers when writer blocks on active read lock

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Message-ID: <AANLkTi=c9DsAZArMpbz-7wUmR3nPQyAsOyOYxmeKh=2Q@mail.gmail.com>
Date:	Fri, 13 Aug 2010 14:19:03 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Michel Lespinasse <walken@...gle.com>,
	David Howells <dhowells@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Waychison <mikew@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 06/11] rwsem: wake queued readers when writer blocks on
 active read lock

On Fri, Aug 13, 2010 at 9:09 AM, Tony Luck <tony.luck@...el.com> wrote:
> Still no reports from other architectures? So this still seems to be an
> ia64 specific problem. Time to start reading rwsem.c

My hung process is "make" (GNU Make 3.81). Stuck forever here:

SYSCALL_DEFINE1(brk, unsigned long, brk)
{
        unsigned long rlim, retval;
        unsigned long newbrk, oldbrk;
        struct mm_struct *mm = current->mm;
        unsigned long min_brk;

        down_write(&mm->mmap_sem);  <<<<<<<<<<<<<<<

Is make multi-threaded these days? If not, I'm confused about how anything
complicated could have happened on mmap_sem.

-Tony
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