Date: Mon, 7 May 2012 15:15:46 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
To: =?ISO-8859-2?Q?Robert_=A6wi=EAcki?= <robert@swiecki.net>
cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: mmap/clone returns ENOMEM with lots of free memory
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On Mon, 7 May 2012, Robert =C5=9Awi=C4=99cki wrote:

> root@ise-test:~/kern-fuz# ./cont.sh
> su: Cannot fork user shell
> su: Cannot fork user shell
> su: Cannot fork user shell
>
> root@ise-test:~/kern-fuz# strace -e mmap,clone su test -c 'kill -CONT
> -1' 2>&1 | grep "=3D \-1"
> clone(child_stack=3D0,
> flags=3DCLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
> child_tidptr=3D0x7fadf334f9f0) =3D -1 ENOMEM (Cannot allocate memory)
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) =3D -1 ENOMEM (Cannot allocate memory)

Hmmm... That looks like some maximum virtual memory limit was violated.

Check ulimit and the overcommit settings (see /proc/meminfo's commitlimit
etc)

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