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