Hi,
During the Chaos Communication Camp a week ago - probably a
very stressful environment for wifi drivers - I experienced a couple
of wifi hangups a day. Trying to simply reconnect with iw or a
network manager did not help. Rebooting solved the issue.
During hangup the following trace appeared in dmesg:
-----
[ 822.795889] wlan0: authentication with ac:a3:1e:d9:5d:d0 timed out
[ 836.219094] wlan0: authenticate with 6c:f3:7f:ec:e9:d0
[ 836.386110] wlan0: direct probe to 6c:f3:7f:ec:e9:d0 (try 1/3)
[ 836.595199] wlan0: direct probe to 6c:f3:7f:ec:e9:d0 (try 2/3)
[ 836.805168] wlan0: direct probe to 6c:f3:7f:ec:e9:d0 (try 3/3)
[ 837.015145] wlan0: authentication with 6c:f3:7f:ec:e9:d0 timed out
[ 850.406952] wlan0: authenticate with ac:a3:1e:d9:5e:d0
[ 850.575102] wlan0: direct probe to ac:a3:1e:d9:5e:d0 (try 1/3)
[ 850.784470] wlan0: direct probe to ac:a3:1e:d9:5e:d0 (try 2/3)
[ 850.994453] wlan0: direct probe to ac:a3:1e:d9:5e:d0 (try 3/3)
[ 851.204576] wlan0: authentication with ac:a3:1e:d9:5e:d0 timed out
[ 864.824543] wlan0: authenticate with 94:b4:0f:30:02:30
[ 864.953566] wlan0: direct probe to 94:b4:0f:30:02:30 (try 1/3)
[ 865.163937] wlan0: direct probe to 94:b4:0f:30:02:30 (try 2/3)
[ 865.285268] ------------[ cut here ]------------
[ 865.285899] WARNING: CPU: 0 PID: 3254 at net/wireless/sme.c:929 cfg80211_connect+0x3f0/0x448 [cfg80211]()
[ 865.285984] Modules linked in: ctr ccm rfcomm bnep binfmt_misc ipv6 snd_bcm2835 snd_pcm snd_seq snd_seq_device snd_timer snd arc4 rt2800usb rt2800lib rt2x00usb rt2x00lib btusb mac80211 joydev evdev cfg80211 crc_ccitt bluetooth rfkill uio_pdrv_genirq uio
[ 865.286123] CPU: 0 PID: 3254 Comm: iw Tainted: G W 4.0.8+ #805
[ 865.286138] Hardware name: BCM2708
[ 865.286253] [<c0015f08>] (unwind_backtrace) from [<c0012ce0>] (show_stack+0x20/0x24)
[ 865.286302] [<c0012ce0>] (show_stack) from [<c0576208>] (dump_stack+0x20/0x28)
[ 865.286388] [<c0576208>] (dump_stack) from [<c0023288>] (warn_slowpath_common+0x8c/0xc4)
[ 865.286471] [<c0023288>] (warn_slowpath_common) from [<c002337c>] (warn_slowpath_null+0x2c/0x34)
[ 865.286909] [<c002337c>] (warn_slowpath_null) from [<bf122104>] (cfg80211_connect+0x3f0/0x448 [cfg80211])
[ 865.287663] [<bf122104>] (cfg80211_connect [cfg80211]) from [<bf1188f4>] (nl80211_connect+0x2d0/0x390 [cfg80211])
[ 865.288125] [<bf1188f4>] (nl80211_connect [cfg80211]) from [<c04c7fcc>] (genl_rcv_msg+0x25c/0x3dc)
[ 865.288251] [<c04c7fcc>] (genl_rcv_msg) from [<c04c7234>] (netlink_rcv_skb+0xbc/0xd0)
[ 865.288290] [<c04c7234>] (netlink_rcv_skb) from [<c04c7d5c>] (genl_rcv+0x30/0x44)
[ 865.288323] [<c04c7d5c>] (genl_rcv) from [<c04c6b94>] (netlink_unicast+0x164/0x220)
[ 865.288353] [<c04c6b94>] (netlink_unicast) from [<c04c7000>] (netlink_sendmsg+0x2fc/0x370)
[ 865.288396] [<c04c7000>] (netlink_sendmsg) from [<c047e530>] (do_sock_sendmsg+0x84/0xa8)
[ 865.288442] [<c047e530>] (do_sock_sendmsg) from [<c047fb58>] (___sys_sendmsg+0x21c/0x230)
[ 865.288480] [<c047fb58>] (___sys_sendmsg) from [<c0480910>] (__sys_sendmsg+0x4c/0x7c)
[ 865.288512] [<c0480910>] (__sys_sendmsg) from [<c0480958>] (SyS_sendmsg+0x18/0x1c)
[ 865.288558] [<c0480958>] (SyS_sendmsg) from [<c000e860>] (ret_fast_syscall+0x0/0x54)
[ 865.288618] ---[ end trace 2a0b1d980b2ed673 ]---
[ 865.288645] ------------[ cut here ]------------
[ 865.289065] WARNING: CPU: 0 PID: 3254 at net/wireless/sme.c:444 cfg80211_connect+0x420/0x448 [cfg80211]()
[ 865.289083] Modules linked in: ctr ccm rfcomm bnep binfmt_misc ipv6 snd_bcm2835 snd_pcm snd_seq snd_seq_device snd_timer snd arc4 rt2800usb rt2800lib rt2x00usb rt2x00lib btusb mac80211 joydev evdev cfg80211 crc_ccitt bluetooth rfkill uio_pdrv_genirq uio
[ 865.289270] CPU: 0 PID: 3254 Comm: iw Tainted: G W 4.0.8+ #805
[ 865.289318] Hardware name: BCM2708
[ 865.289388] [<c0015f08>] (unwind_backtrace) from [<c0012ce0>] (show_stack+0x20/0x24)
[ 865.289442] [<c0012ce0>] (show_stack) from [<c0576208>] (dump_stack+0x20/0x28)
[ 865.289533] [<c0576208>] (dump_stack) from [<c0023288>] (warn_slowpath_common+0x8c/0xc4)
[ 865.289605] [<c0023288>] (warn_slowpath_common) from [<c002337c>] (warn_slowpath_null+0x2c/0x34)
[ 865.290025] [<c002337c>] (warn_slowpath_null) from [<bf122134>] (cfg80211_connect+0x420/0x448 [cfg80211])
[ 865.290705] [<bf122134>] (cfg80211_connect [cfg80211]) from [<bf1188f4>] (nl80211_connect+0x2d0/0x390 [cfg80211])
[ 865.291253] [<bf1188f4>] (nl80211_connect [cfg80211]) from [<c04c7fcc>] (genl_rcv_msg+0x25c/0x3dc)
[ 865.291366] [<c04c7fcc>] (genl_rcv_msg) from [<c04c7234>] (netlink_rcv_skb+0xbc/0xd0)
[ 865.291401] [<c04c7234>] (netlink_rcv_skb) from [<c04c7d5c>] (genl_rcv+0x30/0x44)
[ 865.291435] [<c04c7d5c>] (genl_rcv) from [<c04c6b94>] (netlink_unicast+0x164/0x220)
[ 865.291465] [<c04c6b94>] (netlink_unicast) from [<c04c7000>] (netlink_sendmsg+0x2fc/0x370)
[ 865.291507] [<c04c7000>] (netlink_sendmsg) from [<c047e530>] (do_sock_sendmsg+0x84/0xa8)
[ 865.291543] [<c047e530>] (do_sock_sendmsg) from [<c047fb58>] (___sys_sendmsg+0x21c/0x230)
[ 865.291578] [<c047fb58>] (___sys_sendmsg) from [<c0480910>] (__sys_sendmsg+0x4c/0x7c)
[ 865.291610] [<c0480910>] (__sys_sendmsg) from [<c0480958>] (SyS_sendmsg+0x18/0x1c)
[ 865.291650] [<c0480958>] (SyS_sendmsg) from [<c000e860>] (ret_fast_syscall+0x0/0x54)
[ 865.291670] ---[ end trace 2a0b1d980b2ed674 ]---
[ 865.373895] wlan0: direct probe to 94:b4:0f:30:02:30 (try 3/3)
[ 865.583754] wlan0: authentication with 94:b4:0f:30:02:30 timed out
-----
Board: Odroid-W
Kernel version: 4.0.8 (from Raspbian)
Device: TP-Link TL-WDN4200
Chipset: Ralink RT3573
lsusb: Bus 001 Device 006: ID 148f:3573 Ralink Technology, Corp. TEW-684UB
Driver: rt2800usb
Cheers, Linus
PS: At home and at various other locations I haven't had this
issue so far. Since the Chaos Communication Camp event is over, it
might be difficult for me to reproduce the issue.