Backtrace

WARNING: CPU: 0 PID: 0 at net/mac80211/rx.c:4730 ieee80211_rx_napi+0x98c/0x9a0 [mac80211]
Modules linked in: uinput xt_CHECKSUM xt_MASQUERADE nf_nat_tftp nf_conntrack_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_REJECT nf_reject_ipv6 ip6t_rpfilter ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 rfcomm ccm tun bridge stp llc ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc nls_utf8 hfsplus ath9k uvcvideo btusb btrtl videobuf2_vmalloc videobuf2_memops btbcm ath9k_common ath9k_hw btintel videobuf2_v4l2 videobuf2_common bluetooth videodev mc ecdh_generic ecc snd_hda_codec_cirrus mac80211 snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi ath snd_hda_intel snd_intel_dspcfg intel_powerclamp apple_mfi_fastcharge snd_hda_codec cfg80211 coretemp joydev snd_hda_core snd_hwdep kvm_intel at24 kvm iTCO_wdt snd_seq
 snd_seq_device irqbypass snd_pcm intel_cstate intel_pmc_bxt iTCO_vendor_support snd_timer snd applesmc intel_uncore pcspkr soundcore rfkill libarc4 i2c_i801 intel_ips i2c_smbus lpc_ich apple_bl acpi_cpufreq binfmt_misc ip_tables dm_crypt hid_logitech_hidpp hid_logitech_dj radeon i2c_algo_bit drm_kms_helper firewire_ohci crc32c_intel cec ttm tg3 hid_appleir firewire_core drm uas usb_storage crc_itu_t video fuse
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.18-100.fc31.x86_64 #1
Hardware name: Apple Inc. iMac11,2/Mac-F2238AC8, BIOS    IM112.88Z.0057.B03.1509231647 09/23/15
RIP: 0010:ieee80211_rx_napi+0x98c/0x9a0 [mac80211]
Code: 4c 89 e7 44 29 ee e8 f3 7a 0a df 48 85 c0 0f 84 c4 f9 ff ff e9 2f fb ff ff 0f b6 f1 48 c7 c7 30 1a 93 c0 89 f2 e8 46 19 80 de <0f> 0b e9 e2 f9 ff ff 49 89 ed 31 db 31 ed e9 f5 fc ff ff 90 66 66
RSP: 0018:ffffaf8700003d78 EFLAGS: 00010296
RAX: 000000000000005c RBX: ffff9ce9eee007e0 RCX: 0000000000000027
RDX: 0000000000000027 RSI: 0000000000000092 RDI: ffff9ce9f3c18d08
RBP: ffff9ce72ddf9500 R08: ffff9ce9f3c18d00 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: ffff9ce71fd548f8
R13: ffff9ce9eeff4a08 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff9ce9f3c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000277dd0bd2010 CR3: 00000002c1a0a003 CR4: 00000000000206f0
Call Trace:
 <IRQ>
 ? __build_skb+0x1f/0x50
 ? ieee80211_get_hdrlen_from_skb+0x1d/0x30 [cfg80211]
 ? ieee80211_find_sta_by_ifaddr+0x10b/0x1c0 [mac80211]
 ? ieee80211_sta_register_airtime+0x63/0xa0 [mac80211]
 ath_rx_tasklet+0x9fd/0xe60 [ath9k]
 ath9k_tasklet+0x10b/0x250 [ath9k]
 tasklet_action_common.isra.0+0x5b/0x100
 __do_softirq+0xee/0x2ff
 ? x2apic_cluster_probe.cold+0x11/0x11
 asm_call_irq_on_stack+0x12/0x20
 </IRQ>
 do_softirq_own_stack+0x37/0x40
 irq_exit_rcu+0xd8/0xe0
 common_interrupt+0x75/0x150
 asm_common_interrupt+0x1e/0x40
RIP: 0010:cpuidle_enter_state+0xc6/0x3e0
Code: 90 31 ff e8 0c f5 7d ff 80 7c 24 0f 00 74 17 9c 58 66 66 90 66 90 f6 c4 02 0f 85 e5 02 00 00 31 ff e8 4e 4b 84 ff fb 66 66 90 <66> 66 90 45 85 ed 0f 88 3b 02 00 00 49 63 d5 4c 2b 64 24 10 48 8d
RSP: 0018:ffffffffa0a03e48 EFLAGS: 00000246
RAX: ffff9ce9f3c2a2c0 RBX: ffff9ce9f3c35000 RCX: 000000000000001f
RDX: 0000000000000000 RSI: 000000002819aad9 RDI: 0000000000000000
RBP: ffffffffa0b6f540 R08: 0000494b3063a6c0 R09: 0000000000000312
R10: 00000000000002fc R11: ffff9ce9f3c290e4 R12: 0000494b3063a6c0
R13: 0000000000000003 R14: 0000000000000003 R15: ffffffffa0a14840
 ? cpuidle_enter_state+0xa4/0x3e0
 cpuidle_enter+0x29/0x40
 do_idle+0x1c0/0x260
 cpu_startup_entry+0x19/0x20
 start_kernel+0x80d/0x81d
 ? apply_microcode_early.cold+0xc/0x2b
 secondary_startup_64+0xb6/0xc0