Backtrace

WARNING: CPU: 6 PID: 0 at kernel/sched/core.c:2470 ttwu_queue_wakelist+0xc2/0xd0
Modules linked in: uinput ccm 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 tun bridge stp llc ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep sunrpc vfat fat squashfs loop snd_hda_codec_hdmi snd_soc_skl snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core snd_hda_codec_realtek iwlmvm snd_hda_codec_generic ledtrig_audio snd_compress ac97_bus snd_pcm_dmaengine snd_hda_intel snd_intel_dspcfg x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec mac80211 kvm_intel snd_hda_core uvcvideo snd_hwdep kvm videobuf2_vmalloc libarc4 iTCO_wdt intel_pmc_bxt
 videobuf2_memops mei_hdcp iTCO_vendor_support snd_seq intel_rapl_msr videobuf2_v4l2 ee1004 btusb iwlwifi videobuf2_common btrtl irqbypass snd_seq_device btbcm rapl btintel intel_cstate snd_pcm cfg80211 bluetooth videodev intel_uncore acer_wmi snd_timer pcspkr intel_wmi_thunderbolt sparse_keymap snd joydev mc i2c_i801 ecdh_generic i2c_smbus soundcore wmi_bmof rfkill ucsi_acpi ecc mei_me processor_thermal_device typec_ucsi intel_rapl_common idma64 mei intel_xhci_usb_role_switch roles intel_soc_dts_iosf intel_pch_thermal typec int3403_thermal acer_wireless int340x_thermal_zone int3400_thermal acpi_thermal_rel acpi_pad ip_tables i915 i2c_algo_bit drm_kms_helper cec drm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel r8169 serio_raw wmi video pinctrl_sunrisepoint pinctrl_intel fuse
CPU: 6 PID: 0 Comm: swapper/6 Not tainted 5.8.18-100.fc31.x86_64 #1
Hardware name: Acer TravelMate X3410-M/Apus_KL, BIOS V1.01 11/07/2018
RIP: 0010:ttwu_queue_wakelist+0xc2/0xd0
Code: 04 7f 07 00 b8 01 00 00 00 5b 5d 41 5c 41 5d c3 31 c0 c3 31 c0 f6 c3 08 74 ef 48 c7 c1 c0 a2 02 00 83 7c 0a 04 01 77 e1 eb 82 <0f> 0b 31 c0 eb d9 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 bf 17 00
RSP: 0018:ffffa0d640234e28 EFLAGS: 00010046
RAX: 0000000000000006 RBX: 0000000000000000 RCX: 0000000000018bf0
RDX: ffff93e21ed80000 RSI: 0000000000000006 RDI: 0000000000000006
RBP: 0000000000000006 R08: 0000000000000006 R09: ffff93e21eda9c60
R10: ffff93e21cc01de0 R11: 0000000000000000 R12: ffff93e1e7860000
R13: 0000000000000006 R14: ffff93e1e7860ba4 R15: 000000000002a2c0
FS:  0000000000000000(0000) GS:ffff93e21ed80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001517111302c0 CR3: 000000040a5ec006 CR4: 00000000003606e0
Call Trace:
 <IRQ>
 try_to_wake_up+0x143/0x4f0
 ? insert_work+0x46/0xc0
 __queue_work+0x144/0x3e0
 rcu_work_rcufn+0x1e/0x30
 rcu_do_batch+0x18f/0x3a0
 rcu_core+0x189/0x2e0
 ? sched_clock+0x5/0x10
 __do_softirq+0xee/0x2ff
 asm_call_irq_on_stack+0x12/0x20
 </IRQ>
 do_softirq_own_stack+0x37/0x40
 irq_exit_rcu+0xd8/0xe0
 sysvec_apic_timer_interrupt+0x34/0x80
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:mwait_idle+0x80/0x1c0
Code: 8b 04 25 c0 7b 01 00 0f 01 c8 48 8b 00 a8 08 0f 85 3e 01 00 00 e9 07 00 00 00 0f 00 2d fb 8a 4b 00 31 c0 48 89 c1 fb 0f 01 c9 <65> 8b 2d 09 65 4c 62 0f 1f 44 00 00 65 48 8b 04 25 c0 7b 01 00 f0
RSP: 0018:ffffa0d64011bec8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffa0d64011be90 RDI: 00001dad8b3ec723
RBP: 0000000000000006 R08: 0000000000000001 R09: ffff93de1baab800
R10: 0000000000000260 R11: 000000000000000c R12: ffff93e21cad2740
R13: ffffffff9eb6f540 R14: ffff93e21edb5100 R15: ffff93e21cad2740
 do_idle+0x1de/0x260
 cpu_startup_entry+0x19/0x20
 start_secondary+0x144/0x170
 secondary_startup_64+0xb6/0xc0