Backtrace

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 1471 Comm: Xorg Tainted: G           OE     5.4.13-201.fc31.x86_64 #1
Hardware name: LENOVO 80UD/Lenovo ideapad 1, BIOS 1TCN21WW(V2.02) 10/24/2016
RIP: 0010:radeon_vm_fini+0x16d/0x250 [radeon]
Code: 14 e3 4c 8b 7d 70 41 8b 87 d0 01 00 00 4d 8d 47 68 85 c0 0f 85 f2 fe ff ff 0f 0b e9 eb fe ff ff 49 8b 44 24 48 4d 8d 74 24 48 <48> 8b 10 48 8d 68 a8 48 8d 5a a8 49 39 c6 74 2e 48 8d 7d 70 e8 2a
RSP: 0018:ffffae8b81133d30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff993df72b7a00 RCX: 0000000000000000
RDX: ffff993df71f4e00 RSI: ffff993df72b6400 RDI: ffff993df72b6420
RBP: ffff993e2c564000 R08: 0000000000000000 R09: ffff993e2d03ce00
R10: ffff993e2d03da18 R11: ffff993e37328a78 R12: ffff993df72b6400
R13: ffff993e2c564000 R14: ffff993df72b6448 R15: ffff993e2d1da068
FS:  00007f888eb43f00(0000) GS:ffff993e37200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001ab60a004 CR4: 00000000003606f0
Call Trace:
 radeon_driver_postclose_kms+0x1a3/0x1d0 [radeon]
 drm_file_free.part.0+0x1de/0x270 [drm]
 drm_release+0xa7/0xe0 [drm]
 __fput+0xc1/0x250
 task_work_run+0x8a/0xb0
 do_exit+0x360/0xb80
 ? handle_mm_fault+0xc4/0x1f0
 ? do_user_addr_fault+0x219/0x450
 do_group_exit+0x3a/0xa0
 __x64_sys_exit_group+0x14/0x20
 do_syscall_64+0x5b/0x1a0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f888ef94466
Code: Bad RIP value.
RSP: 002b:00007ffc0363ecd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f888f08a470 RCX: 00007f888ef94466
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000000000e7 R09: fffffffffffffc78
R10: 00007f888eeab84e R11: 0000000000000246 R12: 00007f888f08a470
R13: 00000000000000cf R14: 00007f888f08de68 R15: 0000000000000000
Modules linked in: snd_usb_audio snd_usbmidi_lib snd_rawmidi xt_nat veth rfcomm nf_conntrack_netlink xt_addrtype br_netfilter ccm xt_CHECKSUM xt_MASQUERADE nf_nat_tftp nf_conntrack_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT tun bridge stp llc 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 libcrc32c ip_set nfnetlink ebtable_filter ebtables overlay ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc uvcvideo btusb btrtl btbcm videobuf2_vmalloc btintel videobuf2_memops snd_soc_skl snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core bluetooth snd_soc_acpi_intel_match snd_soc_acpi videobuf2_v4l2 intel_rapl_msr videobuf2_common intel_rapl_common snd_soc_core rtsx_usb_ms x86_pkg_temp_thermal intel_powerclamp videodev coretemp snd_hda_codec_hdmi
 ecdh_generic snd_hda_codec_conexant kvm_intel snd_hda_codec_generic ecc ledtrig_audio memstick snd_compress mc ac97_bus snd_pcm_dmaengine snd_hda_intel snd_intel_dspcfg kvm snd_hda_codec iwlmvm snd_hda_core snd_hwdep mac80211 mei_hdcp snd_seq snd_seq_device snd_pcm irqbypass iTCO_wdt libarc4 iTCO_vendor_support crct10dif_pclmul iwlwifi crc32_pclmul snd_timer ghash_clmulni_intel intel_cstate cfg80211 snd intel_uncore mei_me joydev soundcore pcspkr intel_rapl_perf intel_wmi_thunderbolt i2c_i801 intel_xhci_usb_role_switch mei roles intel_pch_thermal ideapad_laptop sparse_keymap acpi_pad binfmt_misc ip_tables rfkill amdgpu amd_iommu_v2 gpu_sched i915 radeon rtsx_usb_sdmmc mmc_core i2c_algo_bit drm_kms_helper ttm crc32c_intel drm serio_raw r8169 rtsx_usb wmi video fuse [last unloaded: vboxdrv]
CR2: 0000000000000000