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: 1 PID: 2851 Comm: chrome Not tainted 5.11.22-100.fc32.x86_64 #1
Hardware name: Dell Inc. Precision M2800/01P6V3, BIOS A06 05/18/2015
RIP: 0010:radeon_vm_fini+0x135/0x210 [radeon]
Code: e8 30 ef ec e3 4c 8b 7d 70 31 f6 49 8b bf 70 01 00 00 e8 2e b2 49 e4 83 f8 fc 0f 85 49 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 82
RSP: 0018:ffff9f9682bf7c50 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff92b926f9a200 RCX: 0000000000000000
RDX: ffff92b9026b4f00 RSI: ffff92b926f9ae00 RDI: ffff92b926f9ae20
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff9f9682bf7b98
R10: 0000000000000000 R11: 000000000000005f R12: ffff92b926f9ae00
R13: ffff92b8cc540000 R14: ffff92b926f9ae48 R15: dead000000000100
FS:  0000000000000000(0000) GS:ffff92bbdea80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000223a10005 CR4: 00000000001706e0
Call Trace:
 radeon_driver_postclose_kms+0x156/0x170 [radeon]
 drm_file_free.part.0+0x1fb/0x260 [drm]
 drm_release+0x65/0x110 [drm]
 __fput+0x94/0x240
 task_work_run+0x65/0xa0
 do_exit+0x360/0xac0
 do_group_exit+0x33/0xa0
 get_signal+0x154/0x8a0
 arch_do_signal_or_restart+0xf2/0x700
 ? vfs_read+0x176/0x1a0
 exit_to_user_mode_prepare+0xfb/0x190
 ? asm_sysvec_reschedule_ipi+0xa/0x20
 irqentry_exit_to_user_mode+0x5/0x30
 asm_sysvec_reschedule_ipi+0x12/0x20
RIP: 0033:0x556c105410c8
Code: Unable to access opcode bytes at RIP 0x556c1054109e.
RSP: 002b:00007fff45e223e0 EFLAGS: 00000297
RAX: 0000556c10541090 RBX: 0000090001276938 RCX: 0000000000000009
RDX: 0000090001276938 RSI: 0000000000000009 RDI: 00000900008f44b0
RBP: 00007fff45e223e0 R08: 0000556c0f4c0930 R09: 0000000000000000
R10: 0000000045e44000 R11: 00007fff45e44090 R12: 00000900008f83c0
R13: 0000000000000009 R14: 00000900008f03d0 R15: 00000900008f44b0
Modules linked in: vfat fat mmc_block snd_seq_dummy snd_hrtimer rfcomm ccm xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp tun 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 nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc intel_rapl_msr intel_rapl_common iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp at24 coretemp mei_wdt mei_hdcp kvm_intel iTCO_wdt libarc4 ppdev intel_pmc_bxt kvm iTCO_vendor_support iwlwifi dell_laptop uvcvideo snd_hda_codec_realtek snd_hda_codec_generic irqbypass ledtrig_audio snd_hda_codec_hdmi dell_smm_hwmon snd_hda_intel rapl btusb intel_cstate snd_intel_dspcfg
 videobuf2_vmalloc btrtl intel_uncore soundwire_intel btbcm btintel soundwire_generic_allocation videobuf2_memops videobuf2_v4l2 videobuf2_common bluetooth videodev soundwire_cadence snd_hda_codec snd_soc_rt5640 snd_soc_rl6231 snd_soc_core dell_wmi mc cfg80211 joydev dell_smbios dcdbas sparse_keymap dell_wmi_descriptor wmi_bmof snd_compress pcspkr snd_pcm_dmaengine snd_hda_core i2c_i801 ecdh_generic ac97_bus ecc i2c_smbus lpc_ich snd_hwdep mei_me snd_seq snd_seq_device snd_pcm mei snd_timer parport_pc parport dell_smo8800 snd soundcore dell_rbtn rfkill ip_tables amdgpu iommu_v2 gpu_sched i915 radeon crct10dif_pclmul crc32_pclmul crc32c_intel drm_ttm_helper ttm ghash_clmulni_intel i2c_algo_bit drm_kms_helper serio_raw sdhci_pci cqhci sdhci cec e1000e mmc_core drm wmi video fuse
CR2: 0000000000000000