On Thu, Feb 25, 2016 at 5:22 AM, Rafał Miłecki <zaj...@gmail.com> wrote: > Hi, > > 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) >
Note, for 4.1, the backport is known to be incorrect, and it is fixed later by: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/net/netlink/af_netlink.c?h=linux-4.1.y&id=a52ec6de6d1638e8c203d7188c55627f75371612 > 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. Looks like the goto is missing in 4.4 branch too. ;) Mind to send a patch to GregKH? > > 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? > > -- > Rafał
