"nomodeset" did not work.  I have taken the official 5.15.0-33-generic update.  Now I get this stack traces:


[   46.083490] ================================================================================
[   46.138353] UBSAN: invalid-load in /build/linux-MLl0vf/linux-5.15.0/drivers/net/wireless/ath/ath5k/base.c:497:16                                                                                     
[   46.197259] load of value 255 is not a valid value for type '_Bool'
[   46.228123] CPU: 0 PID: 705 Comm: NetworkManager Tainted: P          IOE     5.15.0-33-generic #34-Ubuntu
[   46.228127] Hardware name: Dell Inc. Precision WorkStation T7500  /0D881F, BIOS A18 10/15/2018
[   46.228129] Call Trace:
[   46.228132]  <TASK>
[   46.228135]  show_stack+0x52/0x58
[   46.228143]  dump_stack_lvl+0x4a/0x5f
[   46.228150]  dump_stack+0x10/0x12
[   46.228153]  ubsan_epilogue+0x9/0x45
[   46.228156]  __ubsan_handle_load_invalid_value.cold+0x44/0x49
[   46.228160]  ath5k_vif_iter.cold+0x67/0x70 [ath5k]
[   46.228173]  ath5k_update_bssid_mask_and_opmode+0x63/0x150 [ath5k]
[   46.228183]  ath5k_add_interface+0x1bb/0x260 [ath5k]
[   46.228193]  drv_add_interface+0x4e/0x100 [mac80211]
[   46.228262]  ieee80211_do_open+0x4f9/0x9c0 [mac80211]
[   46.228316]  ? ieee80211_check_concurrent_iface+0x158/0x1c0 [mac80211]
[   46.228370]  ieee80211_open+0x6c/0x90 [mac80211]
[   46.228423]  __dev_open+0xf3/0x1c0
[   46.228428]  __dev_change_flags+0x1a3/0x220
[   46.228431]  dev_change_flags+0x26/0x60
[   46.228434]  do_setlink+0x28a/0xc50
[   46.228437]  ? dev_get_alias+0x35/0x40
[   46.228440]  ? dev_get_alias+0x35/0x40
[   46.228442]  ? nla_put_ifalias+0x38/0xa0
[   46.228445]  ? __nla_validate_parse+0x4c/0x1a0
[   46.228452]  __rtnl_newlink+0x618/0xa20
[   46.228455]  ? __rtnl_newlink+0x14b/0xa20
[   46.228458]  ? __nla_put+0x20/0x30
[   46.228461]  ? __nla_reserve+0x41/0x50
[   46.228464]  ? __nla_reserve+0x41/0x50
[   46.228467]  ? apparmor_inet_conn_request+0x50/0x50
[   46.228471]  ? security_sock_rcv_skb+0x2f/0x50
[   46.228475]  ? skb_queue_tail+0x48/0x50
[   46.228478]  ? sock_def_readable+0x4b/0x80
[   46.228483]  ? __netlink_sendskb+0x62/0x80
[   46.228488]  ? netlink_unicast+0x2f3/0x330
[   46.228492]  ? rtnl_getlink+0x392/0x410
[   46.228499]  ? kmem_cache_alloc_trace+0x19e/0x2e0
[   46.228505]  rtnl_newlink+0x49/0x70
[   46.228507]  rtnetlink_rcv_msg+0x15d/0x400
[   46.228510]  ? rtnl_calcit.isra.0+0x130/0x130
[   46.228513]  netlink_rcv_skb+0x55/0x100
[   46.228517]  rtnetlink_rcv+0x15/0x20
[   46.228522]  netlink_unicast+0x21d/0x330
[   46.228526]  netlink_sendmsg+0x24c/0x4c0
[   46.228530]  sock_sendmsg+0x65/0x70
[   46.228533]  ____sys_sendmsg+0x24e/0x290
[   46.228536]  ? import_iovec+0x31/0x40
[   46.228540]  ? sendmsg_copy_msghdr+0x7b/0xa0
[   46.228543]  ? fput_many+0x4a/0x90
[   46.228548]  ___sys_sendmsg+0x81/0xc0
[   46.228551]  ? do_filp_open+0xb2/0x150
[   46.228555]  ? security_file_free+0x54/0x60
[   46.228560]  ? kmem_cache_free+0x245/0x290
[   46.228563]  ? rseq_get_rseq_cs.isra.0+0x1b/0x220
[   46.228569]  ? __call_rcu+0xa8/0x260
[   46.228574]  ? __fget_files+0x86/0xc0
[   46.228578]  ? __fget_light+0x32/0x80
[   46.228582]  __sys_sendmsg+0x62/0xb0
[   46.228586]  __x64_sys_sendmsg+0x1d/0x20
[   46.228589]  do_syscall_64+0x5c/0xc0
[   46.228595]  ? exit_to_user_mode_prepare+0x37/0xb0
[   46.228599]  ? syscall_exit_to_user_mode+0x27/0x50
[   46.228603]  ? do_syscall_64+0x69/0xc0
[   46.228606]  ? syscall_exit_to_user_mode+0x27/0x50
[   46.228609]  ? do_syscall_64+0x69/0xc0
[   46.228612]  ? asm_exc_page_fault+0x8/0x30
[   46.228616]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   46.228620] RIP: 0033:0x7fe5d68c4b4d
[   46.228624] Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 3a 8f f6 ff 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 33 44 89 c7 48 89 44 24 08 e8 7e 8f f6 ff 48
[   46.228626] RSP: 002b:00007fffb57fe780 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
[   46.228631] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007fe5d68c4b4d
[   46.228633] RDX: 0000000000000000 RSI: 00007fffb57fe7c0 RDI: 000000000000000c
[   46.228635] RBP: 00005591ac4ee040 R08: 0000000000000000 R09: 0000000000000000
[   46.228637] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
[   46.228638] R13: 00007fffb57fe910 R14: 00007fffb57fe90c R15: 0000000000000000
[   46.228642]  </TASK>
[   46.228643] ================================================================================
[   46.395947] ================================================================================
[   46.395955] UBSAN: invalid-load in /build/linux-MLl0vf/linux-5.15.0/drivers/net/wireless/ath/ath5k/base.c:488:16                                                                                     
[   46.395960] load of value 142 is not a valid value for type '_Bool'
[   46.395963] CPU: 0 PID: 735 Comm: wpa_supplicant Tainted: P          IOE     5.15.0-33-generic #34-Ubuntu
[   46.395967] Hardware name: Dell Inc. Precision WorkStation T7500  /0D881F, BIOS A18 10/15/2018
[   46.395969] Call Trace:
[   46.395972]  <TASK>
[   46.395975]  show_stack+0x52/0x58
[   46.395984]  dump_stack_lvl+0x4a/0x5f
[   46.395991]  dump_stack+0x10/0x12
[   46.395994]  ubsan_epilogue+0x9/0x45
[   46.395997]  __ubsan_handle_load_invalid_value.cold+0x44/0x49
[   46.396001]  ? dma_direct_map_sg+0x44/0xc0
[   46.396006]  ath5k_vif_iter.cold+0x13/0x70 [ath5k]
[   46.396020]  __iterate_interfaces+0xa2/0x100 [mac80211]
[   46.396101]  ? ath5k_tasklet_ani+0x30/0x30 [ath5k]
[   46.396110]  ieee80211_iterate_active_interfaces_atomic+0x11/0x20 [mac80211]
[   46.396172]  ath5k_configure_filter+0x114/0x190 [ath5k]
[   46.396182]  ieee80211_configure_filter+0x175/0x2d0 [mac80211]
[   46.396228]  __ieee80211_start_scan+0x2b6/0x650 [mac80211]
[   46.396278]  ieee80211_request_scan+0x30/0x50 [mac80211]
[   46.396328]  ieee80211_scan+0x62/0xf0 [mac80211]
[   46.396385]  rdev_scan+0x2d/0xb0 [cfg80211]
[   46.396453]  cfg80211_scan+0xf2/0x110 [cfg80211]
[   46.396498]  nl80211_trigger_scan+0x47a/0x920 [cfg80211]
[   46.396549]  genl_family_rcv_msg_doit+0xe7/0x150
[   46.396555]  genl_rcv_msg+0xe2/0x1e0
[   46.396559]  ? nl80211_send_scan_start+0xa0/0xa0 [cfg80211]
[   46.396609]  ? genl_get_cmd+0xd0/0xd0
[   46.396613]  netlink_rcv_skb+0x55/0x100
[   46.396617]  genl_rcv+0x29/0x40
[   46.396620]  netlink_unicast+0x21d/0x330
[   46.396624]  netlink_sendmsg+0x24c/0x4c0
[   46.396629]  sock_sendmsg+0x65/0x70
[   46.396633]  ____sys_sendmsg+0x24e/0x290
[   46.396635]  ? import_iovec+0x31/0x40
[   46.396640]  ? sendmsg_copy_msghdr+0x7b/0xa0
[   46.396644]  ___sys_sendmsg+0x81/0xc0
[   46.396648]  ? __check_object_size.part.0+0x3a/0x150
[   46.396653]  ? _copy_to_user+0x20/0x30
[   46.396656]  ? sock_getsockopt+0x110/0xd90
[   46.396661]  ? __check_object_size.part.0+0x3a/0x150
[   46.396664]  ? _copy_to_user+0x20/0x30
[   46.396668]  ? sock_getsockopt+0x110/0xd90
[   46.396671]  ? __cond_resched+0x1a/0x50
[   46.396677]  __sys_sendmsg+0x62/0xb0
[   46.396681]  __x64_sys_sendmsg+0x1d/0x20
[   46.396684]  do_syscall_64+0x5c/0xc0
[   46.396689]  ? do_syscall_64+0x69/0xc0
[   46.396692]  ? do_syscall_64+0x69/0xc0
[   46.396696]  ? __audit_syscall_exit+0x265/0x2c0
[   46.396701]  ? exit_to_user_mode_prepare+0x37/0xb0
[   46.396706]  ? exit_to_user_mode_prepare+0x37/0xb0
[   46.396709]  ? syscall_exit_to_user_mode+0x27/0x50
[   46.396712]  ? do_syscall_64+0x69/0xc0
[   46.396715]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   46.396720] RIP: 0033:0x7f8d2d1efb17
[   46.396724] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
[   46.396727] RSP: 002b:00007ffd3a3620a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   46.396731] RAX: ffffffffffffffda RBX: 0000560443191ac0 RCX: 00007f8d2d1efb17
[   46.396733] RDX: 0000000000000000 RSI: 00007ffd3a3620e0 RDI: 0000000000000006
[   46.396735] RBP: 0000560443191da0 R08: 0000000000000004 R09: 0000560443267530
[   46.396737] R10: 00007ffd3a3621c0 R11: 0000000000000246 R12: 00005604432641d0
[   46.396739] R13: 00007ffd3a3620e0 R14: 0000000000000000 R15: 0000000000000000
[   46.396742]  </TASK>
[   46.396744] ================================================================================