Backtrace

kernel BUG at drivers/vfio/vfio.c:698!
invalid opcode: 0000 [#1] SMP PTI
CPU: 1 PID: 6683 Comm: qemu-event Tainted: P           OE     5.13.12-200.fc34.x86_64 #1
Hardware name: ASUS All Series/X99-A II, BIOS 2101 07/10/2019
RIP: 0010:vfio_iommu_group_notifier+0x28e/0x350 [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 ba e5 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:ffffb8bf42473c60 EFLAGS: 00010282
RAX: 00000000ffffffea RBX: ffff9400631b0200 RCX: 0000000000000000
RDX: ffff93fff4792780 RSI: ffff93ff822a50c8 RDI: 0000000000000000
RBP: ffff9400631b0200 R08: ffffffffc00ea70d R09: 00000000ffffffea
R10: 000000000006bc6d R11: 00000000000008a7 R12: 0000000000000004
R13: ffff93ff822a50c8 R14: ffff93ff829f7a78 R15: 00000000ffffffff
FS:  00007fb6e57fa640(0000) GS:ffff940e8fa40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6b82a4cf8 CR3: 0000000116812004 CR4: 00000000003726e0
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+0x2a8/0x490
 driver_probe_device+0xe8/0x160
 ? 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_iter+0x11c/0x1b0
 new_sync_write+0x108/0x180
 vfs_write+0x1be/0x250
 ksys_write+0x4f/0xc0
 do_syscall_64+0x40/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fb7217373bf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 59 49 f9 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 ac 49 f9 ff 48
RSP: 002b:00007fb6e57f9580 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007fb7217373bf
RDX: 000000000000000c RSI: 00007fb6f8050fe0 RDI: 0000000000000020
RBP: 00007fb6f8050fe0 R08: 0000000000000000 R09: 00007fb7217cd4e0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000020
R13: 0000000000000020 R14: 0000000000000000 R15: 00007fb721f831a8
Modules linked in: vhost_net vhost vhost_iotlb tap tun snd_seq_dummy snd_hrtimer exfat rfcomm 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 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 iwlmvm iTCO_wdt intel_pmc_bxt iTCO_vendor_support mac80211 rapl intel_cstate libarc4 intel_uncore iwlwifi eeepc_wmi snd_hda_codec_realtek asus_wmi sparse_keymap snd_hda_codec_generic video uas wmi_bmof intel_wmi_thunderbolt snd_hda_codec_hdmi pcspkr
 ledtrig_audio usb_storage uvcvideo btusb snd_hda_intel cfg80211 videobuf2_vmalloc btrtl snd_intel_dspcfg btbcm snd_intel_sdw_acpi btintel videobuf2_memops snd_usb_audio snd_hda_codec videobuf2_v4l2 mei_me snd_usbmidi_lib i2c_i801 videobuf2_common snd_rawmidi bluetooth snd_hda_core mei lpc_ich i2c_smbus snd_seq snd_hwdep snd_seq_device joydev videodev snd_pcm ecdh_generic snd_timer mc rfkill ecc snd soundcore zram ip_tables dm_crypt trusted asn1_encoder nvidia_drm(POE) nvidia_modeset(POE) nvidia(POE) drm_ttm_helper ttm iommu_v2 gpu_sched i2c_algo_bit drm_kms_helper crct10dif_pclmul cec crc32_pclmul crc32c_intel mxm_wmi drm e1000e ghash_clmulni_intel nvme nvme_core wmi vfio_pci irqbypass vfio_virqfd vfio_iommu_type1 vfio fuse