Description of problem:
The Intel® Wireless-AC 9260 (on Gigabyte x470 Gaming 7 board) causes the firmware/kernel to fail. I have the latest bios installed.

Version-Release number of selected component (if applicable):
Fedora 28 (kernel 4.16.5-300.fc28.x86_64)


How reproducible:
Install Fedora 28 standard and dnf update. The Intel 9260 Wifi interface does not show up even though iwlwifi is loaded with modprobe.

Actual results:
dmsg:
kernel BUG at
>>drivers/net/wireless/intel/iwlwifi/pcie/rx.c:425!
in
[    5.949573] iwlwifi 0000:06:00.0: enabling device (0000 -> 0002)
[    5.956596] iwlwifi 0000:06:00.0: Direct firmware load for iwlwifi-9260-th-b0-jf-b0-36.ucode failed with error -2
[    5.956607] iwlwifi 0000:06:00.0: Direct firmware load for iwlwifi-9260-th-b0-jf-b0-35.ucode failed with error -2
[    5.970257] iwlwifi 0000:06:00.0: loaded firmware version 34.0.0 op_mode iwlmvm
[    6.056544] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 9260, REV=0x324
[    6.062623] kernel BUG at drivers/net/wireless/intel/iwlwifi/pcie/rx.c:425!
[    6.062680] Modules linked in: iwlmvm(+) edac_mce_amd mac80211 kvm_amd kvm snd_hda_codec_realtek snd_hda_codec_generic irqbypass crct10dif_pclmul crc32_pclmul snd_usb_audio(+) uvcvideo snd_hda_intel btusb drm_kms_helper iwlwifi btrtl btbcm ghash_clmulni_intel videobuf2_vmalloc btintel snd_hda_codec videobuf2_memops snd_usbmidi_lib videobuf2_v4l2 snd_hda_core drm bluetooth videobuf2_common snd_rawmidi snd_hwdep videodev snd_seq cfg80211 snd_seq_device media joydev snd_pcm ipmi_devintf ipmi_msghandler snd_timer ecdh_generic snd wmi_bmof rfkill soundcore sp5100_tco i2c_piix4 k10temp ccp shpchp acpi_cpufreq binfmt_misc hid_apple mxm_wmi igb crc32c_intel ptp pps_core dca i2c_algo_bit wmi
[    6.063032] RIP: 0010:iwl_pcie_rxq_alloc_rbs+0x182/0x1f0 [iwlwifi]
[    6.063340]  _iwl_pcie_rx_init+0x25c/0x730 [iwlwifi]
[    6.063366]  iwl_pcie_rx_init+0x2b/0x3b0 [iwlwifi]
[    6.063392]  iwl_trans_pcie_start_fw+0x293/0x6b0 [iwlwifi]
[    6.063548]  ? iwl_trans_pcie_start_hw+0x59/0x1b0 [iwlwifi]
[    6.063607]  _iwl_op_mode_start.isra.8+0x47/0xa0 [iwlwifi]
[    6.063652]  iwl_opmode_register+0x6f/0xe0 [iwlwifi]


Expected results:
Wifi interface should up with ifconfig.


Additional info:
There's a kernel bug filed here 
https://bugzilla.kernel.org/show_bug.cgi?id=199551