Messages in this thread | | | Date | Wed, 4 May 2016 15:33:04 +0200 | Subject | Re: Regression: netlink fail (triggered by iw) removes extra wlan (phy) interface | From | Rafał Miłecki <> |
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Hi again and sorry for the late reply.
On 16 March 2016 at 17:00, Cong Wang <xiyou.wangcong@gmail.com> wrote: > On Thu, Feb 25, 2016 at 5:22 AM, Rafał Miłecki <zajec5@gmail.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) >> > > 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?
So I just tried kernel 4.1.23 and got that problem again while running my bash script:
Failed to connect to generic netlink. ifconfig: SIOCGIFFLAGS: No such device command failed: No such device (-19) [ 2200.114464] br-lan: port 3(wlan0-1) entered disabled state [ 2200.125979] device wlan0-1 left promiscuous mode [ 2200.134529] br-lan: port 3(wlan0-1) entered disabled state Failed to connect to generic netlink. ifconfig: SIOCGIFFLAGS: No such device command failed: No such device (-19)
-- Rafał
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