Additional info:
WARNING: at drivers/net/wireless/iwlwifi/dvm/../iwl-trans.h:607 iwlagn_mac_flush+0x1a3/0x1b0 [iwldvm]()
Hardware name: 23252DG
iwl_trans_wait_tx_queue_empty bad state = 0
Modules linked in: dvb_usb_dib0700(+) dib8000 dib7000m dib0090 dib0070 dib7000p dib3000mc dibx000_common dvb_usb dvb_core rc_core nls_utf8 fuse ebtable_nat ebtables xt_CHECKSUM bridge stp llc nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE 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 ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables iptable_nat nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack rfcomm bnep snd_hda_codec_hdmi snd_hda_codec_realtek vfat fat binfmt_misc arc4 iwldvm mac80211 iTCO_wdt iTCO_vendor_support uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev media coretemp microcode joydev btusb bluetooth snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm i2c_i801 iwlwifi cdc_ncm cfg80211 usbnet mii snd_page_alloc cdc_acm cdc_wdm snd_timer lpc_ich mfd_core vhost_net mei tun macvtap macvlan kvm_intel kvm thinkpad_acpi snd tpm_tis soundcore rfkill tpm tpm_bios uinput crc32c_intel ghash_clmulni_intel i915 sdhci_pci sdhci i2c_algo_bit mmc_core drm_kms_helper drm e1000e i2c_core wmi video hid_logitech_dj usb_storage sunrpc
Pid: 4616, comm: kworker/u:7 Not tainted 3.6.7-5.fc18.x86_64 #1
Call Trace:
 [<ffffffff8105c8df>] warn_slowpath_common+0x7f/0xc0
 [<ffffffff8105c9d6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0557593>] iwlagn_mac_flush+0x1a3/0x1b0 [iwldvm]
 [<ffffffffa04b4b66>] __ieee80211_recalc_idle+0x236/0x2f0 [mac80211]
 [<ffffffffa04b4d73>] ieee80211_recalc_idle+0x33/0x60 [mac80211]
 [<ffffffffa04dfa30>] ieee80211_sta_connection_lost.isra.19+0x80/0xc0 [mac80211]
 [<ffffffffa04e2118>] ieee80211_sta_work+0x168/0xd30 [mac80211]
 [<ffffffff81621456>] ? __mutex_unlock_slowpath+0x36/0x50
 [<ffffffffa05574c5>] ? iwlagn_mac_flush+0xd5/0x1b0 [iwldvm]
 [<ffffffffa04b43b9>] ieee80211_iface_work+0x2c9/0x360 [mac80211]
 [<ffffffff81078ca7>] process_one_work+0x147/0x4a0
 [<ffffffffa04b40f0>] ? ieee80211_check_queues+0x100/0x100 [mac80211]
 [<ffffffff8107aa0e>] worker_thread+0x15e/0x480
 [<ffffffff8107a8b0>] ? manage_workers+0x2f0/0x2f0
 [<ffffffff8107fdd3>] kthread+0x93/0xa0
 [<ffffffff8162c804>] kernel_thread_helper+0x4/0x10
 [<ffffffff8107fd40>] ? kthread_freezable_should_stop+0x70/0x70
 [<ffffffff8162c800>] ? gs_change+0x13/0x13

Potential duplicate: bug 869186