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Subject: ibss.c backtrace when batman-adv adds wireless interface
From: Josh Boyer <jwboyer@fedoraproject.org>
To: Larry Finger <Larry.Finger@lwfinger.net>,
	Kalle Valo <kvalo@codeaurora.org>,
	Marek Lindner <mareklindner@neomailbox.ch>,
	Simon Wunderlich <sw@simonwunderlich.de>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>, b.a.t.m.a.n@lists.open-mesh.org
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Sender: linux-wireless-owner@vger.kernel.org
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Hi All,

We've had a user report the backtrace below when loading batman-adv on
his machine.  It looks like the cfg80211 layer is complaining about a
null bss returned, but I cannot tell if the rtlwifi driver or
batman-adv is in error here.

Thoughts?

josh

Jan 28 22:29:21 melissa.gathman.org kernel: batman_adv: B.A.T.M.A.N.
advanced 2015.2 (compatibility version 15) loaded
Jan 28 22:29:21 melissa.gathman.org kernel: wlp0s26u1u4: Selected IBSS
BSSID 02:1a:a0:3a:a6:ff based on configured SSID
Jan 28 22:29:21 melissa.gathman.org kernel: ------------[ cut here ]------------
Jan 28 22:29:21 melissa.gathman.org kernel: WARNING: CPU: 1 PID: 111
at net/wireless/ibss.c:35 __cfg80211_ibss_joined+0x166/0x190
[cfg80211]()
Jan 28 22:29:21 melissa.gathman.org kernel: Modules linked in:
batman_adv libcrc32c xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4
nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter
ip6t_REJECT nf_reject_ipv6 xt_conntrack tun ebtable_filter ebtable_nat
ebtable_broute bridge stp llc ebtables ip6table_mangle ip6table_nat
nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_raw
ip6table_security ip6table_filter ip6_tables iptable_mangle
iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat
nf_conntrack iptable_raw iptable_security arc4 rtl8192cu rtl_usb
rtl8192c_common rtlwifi mac80211 cfg80211 rfkill uvcvideo
videobuf2_vmalloc videobuf2_core videobuf2_memops v4l2_common
intel_rapl snd_hda_codec_hdmi snd_usb_audio joydev snd_usbmidi_lib
snd_hda_codec_realtek iosf_mbi x86_pkg_temp_thermal videodev coretemp
kvm_intel
Jan 28 22:29:21 melissa.gathman.org kernel:  media snd_rawmidi cm109
snd_hda_codec_generic kvm snd_hda_intel iTCO_wdt snd_hda_codec
iTCO_vendor_support crct10dif_pclmul snd_hda_core ppdev snd_hwdep
snd_seq snd_seq_device snd_pcm crc32_pclmul crc32c_intel snd_timer snd
dcdbas lpc_ich mei_me parport_pc parport shpchp i2c_i801 mei tpm_tis
tpm soundcore nfsd auth_rpcgss nfs_acl lockd grace sunrpc
hid_microsoft i915 i2c_algo_bit drm_kms_helper drm e1000e serio_raw
ptp pps_core fjes video
Jan 28 22:29:21 melissa.gathman.org kernel: CPU: 1 PID: 111 Comm:
kworker/u32:5 Not tainted 4.3.3-301.fc23.x86_64 #1
Jan 28 22:29:21 melissa.gathman.org kernel: Hardware name: Dell Inc.
OptiPlex 790/0HY9JP, BIOS A06 07/25/2011
Jan 28 22:29:21 melissa.gathman.org kernel: Workqueue: cfg80211
cfg80211_event_work [cfg80211]
Jan 28 22:29:21 melissa.gathman.org kernel:  0000000000000000
000000008beeeb5f ffff8800368bfce0 ffffffff813a626f
Jan 28 22:29:21 melissa.gathman.org kernel:  0000000000000000
ffff8800368bfd18 ffffffff810a07c2 ffff8800c2bc8850
Jan 28 22:29:21 melissa.gathman.org kernel:  ffff8800c2bc8000
ffff8801275bd558 0000000000000000 0000000000000286
Jan 28 22:29:21 melissa.gathman.org kernel: Call Trace:
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff813a626f>]
dump_stack+0x44/0x55
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810a07c2>]
warn_slowpath_common+0x82/0xc0
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810a090a>]
warn_slowpath_null+0x1a/0x20
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffffa05dfcd6>]
__cfg80211_ibss_joined+0x166/0x190 [cfg80211]
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffffa05bb02c>]
cfg80211_process_wdev_events+0x8c/0x190 [cfg80211]
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffffa05bb162>]
cfg80211_process_rdev_events+0x32/0x70 [cfg80211]
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffffa05b601e>]
cfg80211_event_work+0x1e/0x30 [cfg80211]
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810b8cde>]
process_one_work+0x19e/0x3f0
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810b8f7e>]
worker_thread+0x4e/0x450
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810b8f30>] ?
process_one_work+0x3f0/0x3f0
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810bede8>]
kthread+0xd8/0xf0
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810bed10>] ?
kthread_worker_fn+0x160/0x160
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff8178195f>]
ret_from_fork+0x3f/0x70
Jan 28 22:29:21 melissa.gathman.org kernel:  [<ffffffff810bed10>] ?
kthread_worker_fn+0x160/0x160
Jan 28 22:29:21 melissa.gathman.org kernel: ---[ end trace 04ee7067960ce525 ]---
Jan 28 22:29:21 melissa.gathman.org kernel: batman_adv: bat0: Adding
interface: wlp0s26u1u4