[systemd-devel] systemd-udev 195 OOM

[Robert Milasan]

On Mon, 26 Nov 2012 11:20:54 +0100
"Robert Milasan" <RMilasan at suse.com> wrote:

> Hello,
>  under some circumstance udev seems to create a huge amount of
> children slowly ending up in OOM.
> 
> How to reproduce:
> # udevadm control --log-priority=debug
> # echo 3 >/proc/sys/vm/drop_caches
> # /etc/init.d/openvpn restart
> 
> Bug: 
> https://bugzilla.novell.com/show_bug.cgi?id=790156
> 
> Does anybody know why this happens (this was reproduced on openSUSE
> 12.3 (factory)).
> 
> I've also attached the /var/log/messages.
> 

This looks like an issue with the kernel commit:

c8d68e6be1c3b242f1c598595830890b65cea64a
Author: Jason Wang <jasowang at redhat.com>
Date:   Wed Oct 31 19:46:00 2012 +0000

    tuntap: multiqueue support
...
+#define MAX_TAP_QUEUES 1024

Dropping MAX_TAP_QUEUES to 50 seems to fix the issue, but anyway udev
should also be able to handle the situation if MAX_TAP_QUEUES is 1024.


-- 
Robert Milasan

L3 Support Engineer
SUSE Linux (http://www.suse.com)
email: rmilasan at suse.com
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