Additional info:
reporter:       libreport-2.1.4
WARNING: at net/mac80211/rx.c:3059 ieee80211_rx+0x734/0x840 [mac80211]()
Hardware name: Vostro 3560
Modules linked in: tcp_lp ebtable_nat fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_filter ebtables ip6table_filter ip6_tables be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi rfcomm bnep vfat fat snd_hda_codec_hdmi arc4 ath9k ath9k_common ath9k_hw ath mac80211 btusb bluetooth snd_hda_codec_conexant uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev media cfg80211 snd_hda_intel snd_hda_codec dell_laptop rfkill dell_wmi snd_hwdep snd_seq snd_seq_device
 iTCO_wdt iTCO_vendor_support snd_pcm snd_page_alloc snd_timer snd soundcore sparse_keymap dcdbas mei i2c_i801 lpc_ich mfd_core coretemp microcode joydev vhost_net tun macvtap macvlan kvm_intel kvm uinput i915 crc32c_intel ghash_clmulni_intel i2c_algo_bit drm_kms_helper drm r8169 mii i2c_core wmi video sunrpc
Pid: 1910, comm: firefox Not tainted 3.6.10-4.fc18.x86_64 #1
Call Trace:
 <IRQ>  [<ffffffff8105c8df>] warn_slowpath_common+0x7f/0xc0
 [<ffffffff8105c93a>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa048c2d4>] ieee80211_rx+0x734/0x840 [mac80211]
 [<ffffffff81507364>] ? build_skb+0x34/0x1c0
 [<ffffffff812f8998>] ? is_swiotlb_buffer+0x18/0x40
 [<ffffffff812f8ca0>] ? unmap_single+0x30/0x70
 [<ffffffffa0500871>] ath_rx_tasklet+0xb21/0x1260 [ath9k]
 [<ffffffff812f90e0>] ? map_single+0x60/0x60
 [<ffffffffa04fe984>] ath9k_tasklet+0xe4/0x140 [ath9k]
 [<ffffffff81065a43>] tasklet_action+0x63/0xd0
 [<ffffffff810654b0>] __do_softirq+0xd0/0x210
 [<ffffffff8101b963>] ? native_sched_clock+0x13/0x80
 [<ffffffff8162cc7c>] call_softirq+0x1c/0x30
 [<ffffffff81016205>] do_softirq+0x75/0xb0
 [<ffffffff810658a5>] irq_exit+0xb5/0xc0
 [<ffffffff8162d5be>] smp_apic_timer_interrupt+0x6e/0x99
 [<ffffffff8162c58a>] apic_timer_interrupt+0x6a/0x70
 <EOI>  [<ffffffff811a9e51>] ? update_time+0x81/0xc0
 [<ffffffff816238b3>] ? _raw_spin_lock+0x13/0x30
 [<ffffffff810b6ca5>] futex_requeue+0x125/0x8b0
 [<ffffffff810b7a06>] do_futex+0xc6/0xab0
 [<ffffffff811ceb7b>] ? fsnotify+0x24b/0x340
 [<ffffffff810b847d>] sys_futex+0x8d/0x190
 [<ffffffff810d8d5c>] ? __audit_syscall_entry+0xcc/0x300
 [<ffffffff810d937c>] ? __audit_syscall_exit+0x3ec/0x450
 [<ffffffff8162bae9>] system_call_fastpath+0x16/0x1b

Potential duplicate: bug 866016