netdev - Re: Regression: netlink fail (triggered by iw) removes extra wlan (phy) interface

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CACna6rx84_StJWYKekxw=SD=ReaEyTDFJLGLGeXshU6QVRrPPw@mail.gmail.com>
Date:	Wed, 16 Mar 2016 13:00:51 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	Network Development <netdev@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>
Cc:	Cong Wang <cwang@...pensource.com>,
	David Miller <davem@...emloft.net>,
	Tom Herbert <tom@...bertland.com>, kafai@...com,
	kernel-team <kernel-team@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Pirko <jiri@...nulli.us>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Thomas Graf <tgraf@...g.ch>, Scott Feldman <sfeldma@...il.com>
Subject: Re: Regression: netlink fail (triggered by iw) removes extra wlan
 (phy) interface

On 25 February 2016 at 14:22, Rafał Miłecki <zajec5@...il.com> wrote:
> After updating kernel in OpenWrt from 4.1.6 to 4.1.10 I noticed that
> if "iw" command fails (which happens very rarely) my wlan0-1 interface
> disappears. To trigger this problem easily I'm using this trivial
> script:
> while [ 1 ]
> do
>         iw phy phy0 interface add mon0 type monitor
>         ifconfig mon0 up
>         iw dev mon0 del
> done
>
> Whenever it goes wrong I see:
> Failed to connect to generic netlink.
> kern.info kernel: [ 1933.114338] br-lan: port 3(wlan0-1) entered disabled state
> kern.info kernel: [ 1933.335568] device wlan0-1 left promiscuous mode
> kern.info kernel: [ 1933.340385] br-lan: port 3(wlan0-1) entered disabled state
> daemon.notice netifd: Network device 'wlan0-1' link is down
> command failed: Too many open files in system (-23)
>
> This regression is caused by commit:
> 4e27762 netlink: Fix autobind race condition that leads to zero port ID
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=4e27762417669cb459971635be550eb7b5598286
> that is a backport of upstream:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f770c0a09da855a2b51af6d19de97fb955eca85
>
> This still happens with kernel 4.4.
>
> My hardware is Linksys WRT160NL (Atheros AR9130 SoC) and I'm using two
> __ap interfaces on phy0 (wlan0 and wlan0-1).
>
> Could you take a look at this?
> Is there some additional info I could provide to help fixing this?

Ping?

-- 
Rafał