Backtrace

kernel BUG at drivers/vfio/vfio.c:758!
invalid opcode: 0000 [#1] SMP PTI
CPU: 8 PID: 3554 Comm: rpc-worker Not tainted 5.8.15-301.fc33.x86_64 #1
Hardware name: Default string Default string/X99, BIOS 5.11 10/14/2019
RIP: 0010:vfio_iommu_group_notifier+0x292/0x351 [vfio]
Code: 0f 0b e9 4f fe ff ff 0f 1f 44 00 00 8b 43 08 85 c0 0f 84 3f fe ff ff 48 89 de 4c 89 ef e8 e6 ed ff ff 85 c0 0f 84 2c fe ff ff <0f> 0b 0f 1f 44 00 00 e9 20 fe ff ff 49 8b 45 68 48 8b 7b 10 48 8b
RSP: 0018:ffffc00fc5753ce0 EFLAGS: 00010282
RAX: 00000000ffffffea RBX: ffffa0f7c357da00 RCX: 0000000000000000
RDX: ffffa0f7f73b26c0 RSI: ffffa0f82c4f70b0 RDI: 0000000000000000
RBP: ffffa0f7c357da00 R08: 00000000ffffffea R09: ffffffffc0cd1c20
R10: 000000000000008a R11: 0000000000000000 R12: 0000000000000004
R13: ffffa0f82c4f70b0 R14: ffffa0f8269f9578 R15: 00000000ffffffff
FS:  00007ff97fec0640(0000) GS:ffffa0f82fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff97fec0910 CR3: 00000003ae822003 CR4: 00000000003626e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 blocking_notifier_call_chain+0x5d/0x80
 iommu_bus_notifier+0x5f/0x90
 blocking_notifier_call_chain+0x5d/0x80
 driver_bound+0x8e/0xe0
 really_probe+0x31c/0x400
 driver_probe_device+0xe1/0x150
 ? driver_allows_async_probing+0x50/0x50
 bus_for_each_drv+0x6a/0xa0
 __device_attach+0xb4/0x1b0
 bus_rescan_devices_helper+0x35/0x80
 drivers_probe_store+0x31/0x60
 kernfs_fop_write+0xce/0x1b0
 vfs_write+0xc7/0x1f0
 ksys_write+0x4f/0xc0
 do_syscall_64+0x4d/0x90
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7ff98eec505f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c fd ff ff 48
RSP: 002b:00007ff97febf3b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007ff98eec505f
RDX: 000000000000000c RSI: 00007ff960019a50 RDI: 0000000000000021
RBP: 00007ff960019a50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000021
R13: 0000000000000021 R14: 0000000000000000 R15: 00007ff98f49b8f0
Modules linked in: vfio_pci vfio_virqfd vfio_iommu_type1 vfio uinput xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter tun bridge stp llc rfkill sunrpc intel_rapl_msr intel_rapl_common snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio x86_pkg_temp_thermal intel_powerclamp snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core coretemp kvm_intel snd_hwdep iTCO_wdt kvm snd_seq snd_seq_device irqbypass intel_pmc_bxt snd_pcm rapl intel_cstate snd_timer intel_uncore iTCO_vendor_support snd pcspkr soundcore i2c_i801 i2c_smbus mei_me mei lpc_ich zram ip_tables nouveau video mxm_wmi drm_kms_helper crct10dif_pclmul crc32_pclmul crc32c_intel cec ttm ghash_clmulni_intel drm r8169 igb dca i2c_algo_bit wmi fuse