From: "Robert Święcki" <robert@swiecki.net>
To: Christoph Lameter <cl@linux.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: mmap/clone returns ENOMEM with lots of free memory
Date: Mon, 7 May 2012 23:41:51 +0200 [thread overview]
Message-ID: <CAP145piK2kW4F94pNdKpo_sGg8OD914exOtwCx2o+83jx5Toog@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1205071514040.6029@router.home>
On Mon, May 7, 2012 at 10:15 PM, Christoph Lameter <cl@linux.com> wrote:
> On Mon, 7 May 2012, Robert Święcki 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 "= \-1"
>> clone(child_stack=0,
>> flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
>> child_tidptr=0x7fadf334f9f0) = -1 ENOMEM (Cannot allocate memory)
>> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
>> 0) = -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)
Yup (btw: I attached dump of some proc files and some debug commands
in the original e-mail - can be found here
http://marc.info/?l=linux-kernel&m=133640623421007&w=2 in case some
MTA removed them)
CommitLimit: 1981528 kB
Committed_AS: 1916788 kB
just not sure if Committed_AS should present this kind of value. Did I
just hit a legitimate condition, or may it suggest a bug? I'm a bit
puzzled cause
root@ise-test:/proc# grep Mem /proc/meminfo
MemTotal: 3963060 kB
MemFree: 3098324 kB
Also, some sysctl values:
vm.overcommit_memory = 2
vm.overcommit_ratio = 50
--
Robert Święcki
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next prev parent reply other threads:[~2012-05-07 21:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-07 15:54 Robert Święcki
2012-05-07 20:15 ` Christoph Lameter
2012-05-07 21:41 ` Robert Święcki [this message]
2012-05-08 14:02 ` Christoph Lameter
2012-05-08 14:47 ` Robert Święcki
2012-05-08 15:31 ` Alan Cox
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