Comment 3 for bug 1627643

I installed nplan on yakkety but i was unable to reproduce ogra's problem neither i got the error messages i posted above - what's the software used on first boot to configure the board?

Anyhow, i manually tested the wifi driver and i was able to connect to my wlan without a hic using wpa_supplicant but while experimenting in different ways, i was able to get this stack trace:

...
[ 71.465029] brcmf_add_if: ERROR: netdev:wlan0 already exists
[ 71.470095] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 71.470965] brcmf_add_if: ignore IF event
[ 114.340647] brcmf_cfg80211_escan: Connecting: status (3)
[ 114.346198] brcmf_cfg80211_scan: scan error (-11)
[ 115.935291] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 123.778629] brcmf_cfg80211_escan: Connecting: status (7)
[ 123.784173] brcmf_cfg80211_scan: scan error (-11)
[ 133.362434] ------------[ cut here ]------------
[ 133.362695] WARNING: CPU: 0 PID: 464 at /build/linux-raspi2-ocgtfH/linux-raspi2-4.4.0/net/wireless/sme.c:981 cfg80211_connect
+0x220/0x24c [cfg80211]()
[ 133.362706] Modules linked in: brcmfmac brcmutil cfg80211 joydev i2c_bcm2708 bcm2835_gpiomem uio_pdrv_genirq uio ip_tables x_
tables
[ 133.362764] CPU: 0 PID: 464 Comm: wpa_supplicant Not tainted 4.4.0-1019-raspi2 #25-Ubuntu
[ 133.362773] Hardware name: BCM2709
[ 133.362808] [<80111f34>] (unwind_backtrace) from [<8010d194>] (show_stack+0x20/0x24)
[ 133.362829] [<8010d194>] (show_stack) from [<8056158c>] (dump_stack+0xc8/0x10c)
[ 133.362853] [<8056158c>] (dump_stack) from [<80124644>] (warn_slowpath_common+0x94/0xc4)
[ 133.362874] [<80124644>] (warn_slowpath_common) from [<80124778>] (warn_slowpath_null+0x2c/0x34)
[ 133.363079] [<80124778>] (warn_slowpath_null) from [<7f09fb6c>] (cfg80211_connect+0x220/0x24c [cfg80211])
[ 133.363454] [<7f09fb6c>] (cfg80211_connect [cfg80211]) from [<7f0bb280>] (cfg80211_mgd_wext_connect+0x11c/0x17c [cfg80211])
[ 133.363829] [<7f0bb280>] (cfg80211_mgd_wext_connect [cfg80211]) from [<7f0bb638>] (cfg80211_mgd_wext_siwessid+0xf4/0x160 [cfg80211])
[ 133.364200] [<7f0bb638>] (cfg80211_mgd_wext_siwessid [cfg80211]) from [<7f0ba7d0>] (cfg80211_wext_siwessid+0x30/0x44 [cfg80211])
[ 133.364400] [<7f0ba7d0>] (cfg80211_wext_siwessid [cfg80211]) from [<809ce504>] (ioctl_standard_iw_point+0x1a8/0x3b8)
[ 133.364423] [<809ce504>] (ioctl_standard_iw_point) from [<809ce804>] (ioctl_standard_call+0xac/0xfc)
[ 133.364444] [<809ce804>] (ioctl_standard_call) from [<809cebf0>] (wext_handle_ioctl+0x25c/0x288)
[ 133.364466] [<809cebf0>] (wext_handle_ioctl) from [<808adb58>] (dev_ioctl+0x548/0x838)
[ 133.364490] [<808adb58>] (dev_ioctl) from [<808736b4>] (sock_ioctl+0x16c/0x2a0)
[ 133.364512] [<808736b4>] (sock_ioctl) from [<802be058>] (do_vfs_ioctl+0x438/0x664)
[ 133.364533] [<802be058>] (do_vfs_ioctl) from [<802be300>] (SyS_ioctl+0x7c/0x8c)
[ 133.364554] [<802be300>] (SyS_ioctl) from [<80108d00>] (ret_fast_syscall+0x0/0x1c)
[ 133.364648] ---[ end trace 519485581e0b69c4 ]---
[ 133.558766] brcmf_run_escan: error (-52)
[ 133.562890] brcmf_cfg80211_scan: scan error (-52)
[ 133.568997] brcmf_run_escan: error (-52)
[ 133.573087] brcmf_cfg80211_scan: scan error (-52)
[ 133.579158] brcmf_run_escan: error (-52)
[ 133.583246] brcmf_cfg80211_scan: scan error (-52)

i don't know if that's the stack trace ogra's was seeing on his board.