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: 2 PID: 211750 Comm: VizCompositorTh Not tainted 5.14.17-201.fc34.x86_64 #1
Hardware name: Dell Inc. Inspiron 5448/01648V, BIOS A05 07/27/2015
RIP: 0010:radeon_vm_fini+0x14a/0x230 [radeon]
Code: e8 fb 59 2e e4 4c 8b 7d 70 31 f6 49 8b bf 70 01 00 00 e8 c9 30 8d e4 83 f8 fc 0f 85 34 ff 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 2d
RSP: 0018:ffffa57743f33c70 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff99a018e13c00 RCX: 0000000000000000
RDX: ffff999ffa9acf80 RSI: ffff99a018e13000 RDI: ffff99a018e13020
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffa57743f33bb8
R10: ffff999f541542a0 R11: 000000000000005f R12: ffff99a018e13000
R13: ffff999fca74c000 R14: ffff99a018e13048 R15: dead000000000100
FS:  0000000000000000(0000) GS:ffff99a116d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006bc10001 CR4: 00000000003706e0
Call Trace:
 radeon_driver_postclose_kms+0x16b/0x180 [radeon]
 drm_file_free.part.0+0x206/0x250 [drm]
 drm_release+0x65/0x110 [drm]
 __fput+0x94/0x240
 task_work_run+0x65/0xa0
 do_exit+0x33d/0xa90
 ? sugov_get_util+0x5e/0x70
 do_group_exit+0x33/0xa0
 get_signal+0x16b/0x8c0
 ? __switch_to_asm+0x42/0x70
 ? finish_task_switch.isra.0+0xb1/0x2d0
 arch_do_signal_or_restart+0xfd/0x730
 ? lapic_next_deadline+0x28/0x30
 ? clockevents_program_event+0x95/0xf0
 ? hrtimer_interrupt+0x15d/0x2c0
 exit_to_user_mode_prepare+0x11a/0x240
 ? asm_sysvec_reschedule_ipi+0xa/0x20
 irqentry_exit_to_user_mode+0x5/0x20
 asm_sysvec_reschedule_ipi+0x12/0x20
RIP: 0033:0x7fae5ddbc5a8
Code: Unable to access opcode bytes at RIP 0x7fae5ddbc57e.
RSP: 002b:00007fae3b8cf380 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 000028320087db18 RCX: 0000283200025b90
RDX: 0000000000000000 RSI: 00002832000a07c0 RDI: 000028320087db00
RBP: 000028320087db00 R08: 00007fae5ddbea7a R09: 0000000000000000
R10: 00007ffd95885080 R11: 00007ffd95885090 R12: 00002832000a07c0
R13: 0000000000000000 R14: 00007fae3b8cf430 R15: 00002ccf3688ee38
Modules linked in: tun xt_nat veth nf_conntrack_netlink xt_addrtype br_netfilter rfcomm snd_seq_dummy snd_hrtimer xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp bridge stp llc nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set overlay nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter bnep sunrpc squashfs loop intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass dell_laptop dell_smm_hwmon iwlmvm mac80211 libarc4 rapl intel_cstate mei_hdcp at24 iTCO_wdt intel_pmc_bxt iTCO_vendor_support uvcvideo intel_uncore videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common
 rtsx_usb_ms videodev iwlwifi mc memstick btusb cfg80211 btrtl pcspkr btbcm dell_wmi btintel snd_ctl_led dell_smbios dcdbas snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi mei_me sparse_keymap snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device joydev snd_pcm snd_timer snd dell_wmi_descriptor mei i2c_i801 i2c_smbus bluetooth soundcore ecdh_generic lpc_ich dell_rbtn wmi_bmof rfkill dw_dmac acpi_pad zram ip_tables amdgpu iommu_v2 gpu_sched i915 radeon rtsx_usb_sdmmc mmc_core drm_ttm_helper i2c_algo_bit ttm crct10dif_pclmul crc32_pclmul crc32c_intel drm_kms_helper cec ghash_clmulni_intel serio_raw drm hid_multitouch rtsx_usb wmi i2c_hid_acpi video pinctrl_lynxpoint i2c_hid i2c_dev ipmi_devintf ipmi_msghandler fuse
CR2: 0000000000000000