linux-kernel - Re: [BUG] Invalid return address of mmap() followed by mbind() in multithreaded context

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Message-ID: <20110618181232.GI16236@one.firstfloor.org>
Date:	Sat, 18 Jun 2011 20:12:32 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Vasileios Karakasis <bkk@...ab.ece.ntua.gr>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-numa@...r.kernel.org
Subject: Re: [BUG] Invalid return address of mmap() followed by mbind() in multithreaded context

>     for (i = 0; i < NR_ITER; i++) {
>         addr = mmap(0, PAGE_SIZE, PROT_READ | PROT_WRITE,
>                     MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
>         if (addr == (void *) -1) {
>             assert(0 && "mmap failed");
>         }
>         *addr = 0;
> 
>         err = mbind(addr, PAGE_SIZE, MPOL_BIND, &node, sizeof(node), 0);

mbind() can be only done before the first touch. you're not actually testing 
numa policy.

-andi
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