Description of problem:
Seems to be random.   I think I resized a Firefox window this time.   

Additional info:
reporter:       libreport-2.6.2
WARNING: CPU: 2 PID: 1929 at drivers/net/wireless/iwlwifi/pcie/trans.c:1429 iwl_trans_pcie_grab_nic_access+0x128/0x140 [iwlwifi]()
Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff)
Modules linked in: ccm rfcomm fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnep arc4 intel_rapl iosf_mbi x86_pkg_temp_thermal iTCO_wdt hp_wmi iTCO_vendor_support ppdev coretemp sparse_keymap tpm_infineon iwlmvm mac80211 kvm snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi crct10dif_pclmul crc32_pclmul snd_hda_intel snd_hda_controller crc32c_intel snd_hda_codec
 iwlwifi snd_hda_core snd_hwdep ghash_clmulni_intel uvcvideo snd_seq btusb snd_seq_device btbcm btintel videobuf2_vmalloc videobuf2_core cfg80211 bluetooth snd_pcm videobuf2_memops v4l2_common videodev i2c_i801 snd_timer snd rtsx_pci_ms mei_me lpc_ich media memstick rfkill soundcore mei parport_pc parport wmi ie31200_edac video edac_core hp_accel shpchp lis3lv02d tpm_tis input_polldev tpm hp_wireless nfsd auth_rpcgss nfs_acl lockd grace sunrpc mmc_block hid_logitech_hidpp uas usb_storage hid_logitech_dj 8021q garp stp llc mrp amdkfd amd_iommu_v2 radeon rtsx_pci_sdmmc mmc_core i2c_algo_bit drm_kms_helper ttm e1000e drm serio_raw rtsx_pci mfd_core ptp pps_core
CPU: 2 PID: 1929 Comm: Xorg Not tainted 4.1.7-200.fc22.x86_64 #1
Hardware name: Hewlett-Packard HP ZBook 17 G2/2255, BIOS M70 Ver. 01.07 02/26/2015
 0000000000000000 000000001914f3ef ffff88089dc83c68 ffffffff8179972d
 0000000000000000 ffff88089dc83cc0 ffff88089dc83ca8 ffffffff810a165a
 0000000000000000 ffff88087836c000 0000000000000000 ffff88087836fcb0
Call Trace:
 <IRQ>  [<ffffffff8179972d>] dump_stack+0x45/0x57
 [<ffffffff810a165a>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff810a16e5>] warn_slowpath_fmt+0x55/0x70
 [<ffffffffa0786108>] iwl_trans_pcie_grab_nic_access+0x128/0x140 [iwlwifi]
 [<ffffffffa07838de>] iwl_trans_pcie_read_mem+0x3e/0xd0 [iwlwifi]
 [<ffffffffa077fa6f>] iwl_pcie_txq_stuck_timer+0xcf/0x3b0 [iwlwifi]
 [<ffffffff816310bd>] ? intel_pstate_timer_func+0x31d/0x3f0
 [<ffffffffa077f9a0>] ? iwl_pcie_txq_unmap+0xf0/0xf0 [iwlwifi]
 [<ffffffff81109109>] call_timer_fn+0x39/0x110
 [<ffffffffa077f9a0>] ? iwl_pcie_txq_unmap+0xf0/0xf0 [iwlwifi]
 [<ffffffff811097ea>] run_timer_softirq+0x24a/0x300
 [<ffffffff810a5cdb>] __do_softirq+0x10b/0x2d0
 [<ffffffff810a60e5>] irq_exit+0x145/0x150
 [<ffffffff817a2b36>] smp_apic_timer_interrupt+0x46/0x60
 [<ffffffff817a0bbe>] apic_timer_interrupt+0x6e/0x80
 <EOI>  [<ffffffffa025f39f>] ? radeon_vm_get_bos+0x1f/0x130 [radeon]
 [<ffffffffa01ae7d1>] ? radeon_cs_parser_relocs+0x81/0x480 [radeon]
 [<ffffffffa01aeb94>] radeon_cs_parser_relocs+0x444/0x480 [radeon]
 [<ffffffffa01af583>] radeon_cs_ioctl+0x273/0x7b0 [radeon]
 [<ffffffffa003d9df>] drm_ioctl+0x12f/0x620 [drm]
 [<ffffffff8111e230>] ? futex_wake+0x80/0x160
 [<ffffffffa01af310>] ? radeon_cs_parser_init+0x4d0/0x4d0 [radeon]
 [<ffffffff811203d1>] ? do_futex+0x121/0xab0
 [<ffffffffa017404c>] radeon_drm_ioctl+0x4c/0x80 [radeon]
 [<ffffffff8123fe06>] do_vfs_ioctl+0x2c6/0x4d0
 [<ffffffff81240091>] SyS_ioctl+0x81/0xa0
 [<ffffffff8179bcf7>] ? schedule+0x37/0x90
 [<ffffffff8179fcee>] system_call_fastpath+0x12/0x71
 [<ffffffff8179fcc9>] ? system_call_after_swapgs+0x36/0x49