A lot of traces in dmesg from RCU in released 5.19.0-051900-generic (from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.19/):
[ 11.878971] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 6 jiffies s: 49 root: 0x1/.
[ 11.879016] rcu: blocking rcu_node structures (internal RCU debug):
[ 11.879037] Task dump for CPU 0:
[ 11.879038] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 11.879043] Call Trace:
[ 11.879045] <TASK>
[ 11.879050] ? find_kallsyms_symbol+0x92/0x1a0
[ 11.879056] ? amdgpu_ras_query_err_status+0x100/0x100 [amdgpu]
[ 11.879370] ? xgpu_ai_request_full_gpu_access+0x20/0x20 [amdgpu]
[ 11.879590] ? module_address_lookup+0x68/0xc0
[ 11.879593] ? xgpu_ai_request_init_data+0x50/0x50 [amdgpu]
[ 11.879813] ? kallsyms_lookup_buildid+0xf7/0x180
[ 11.879817] ? kallsyms_lookup+0x14/0x20
[ 11.879819] ? test_for_valid_rec+0x38/0x80
[ 11.879822] ? change_page_attr_set_clr+0x150/0x1c0
[ 11.879826] ? ftrace_module_enable+0xa6/0x210
[ 11.879829] ? load_module+0xa93/0xd30
[ 11.879831] ? security_kernel_post_read_file+0x5c/0x70
[ 11.879834] ? kernel_read_file+0x230/0x290
[ 11.879837] ? __do_sys_finit_module+0xc8/0x140
[ 11.879839] ? __do_sys_finit_module+0xc8/0x140
[ 11.879842] ? __x64_sys_finit_module+0x18/0x20
[ 11.879844] ? do_syscall_64+0x5c/0x90
[ 11.879848] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 11.879851] </TASK>
[ 11.954966] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 25 jiffies s: 49 root: 0x1/.
[ 11.955002] rcu: blocking rcu_node structures (internal RCU debug):
[ 11.955022] Task dump for CPU 0:
[ 11.955023] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 11.955027] Call Trace:
[ 11.955028] <TASK>
[ 11.955030] ? find_kallsyms_symbol+0x9a/0x1a0
[ 11.955033] ? amdgpu_ras_query_err_status+0x100/0x100 [amdgpu]
[ 11.955249] ? tonga_ih_check_soft_reset+0x60/0x60 [amdgpu]
[ 11.955474] ? module_address_lookup+0x68/0xc0
[ 11.955476] ? tonga_ih_disable_interrupts+0x70/0x70 [amdgpu]
[ 11.955701] ? kallsyms_lookup_buildid+0xf7/0x180
[ 11.955704] ? kallsyms_lookup+0x14/0x20
[ 11.955707] ? test_for_valid_rec+0x38/0x80
[ 11.955710] ? change_page_attr_set_clr+0x150/0x1c0
[ 11.955713] ? ftrace_module_enable+0xa6/0x210
[ 11.955715] ? load_module+0xa93/0xd30
[ 11.955717] ? security_kernel_post_read_file+0x5c/0x70
[ 11.955719] ? kernel_read_file+0x230/0x290
[ 11.955722] ? __do_sys_finit_module+0xc8/0x140
[ 11.955724] ? __do_sys_finit_module+0xc8/0x140
[ 11.955727] ? __x64_sys_finit_module+0x18/0x20
[ 11.955729] ? do_syscall_64+0x5c/0x90
[ 11.955732] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 11.955735] </TASK>
[ 12.030963] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 44 jiffies s: 49 root: 0x1/.
[ 12.031003] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.031025] Task dump for CPU 0:
[ 12.031027] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.031031] Call Trace:
[ 12.031033] <TASK>
[ 12.031035] ? find_kallsyms_symbol+0x92/0x1a0
[ 12.031040] ? amdgpu_ras_query_err_status+0x100/0x100 [amdgpu]
[ 12.031326] ? gfx_v9_0_fault.isra.0+0xd0/0xd0 [amdgpu]
[ 12.031634] ? module_address_lookup+0x68/0xc0
[ 12.031638] ? gfx_v9_0_set_clockgating_state+0xe0/0xe0 [amdgpu]
[ 12.031945] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.031949] ? kallsyms_lookup+0x14/0x20
[ 12.031952] ? test_for_valid_rec+0x38/0x80
[ 12.031956] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.031960] ? ftrace_module_enable+0xa6/0x210
[ 12.031963] ? load_module+0xa93/0xd30
[ 12.031966] ? security_kernel_post_read_file+0x5c/0x70
[ 12.031969] ? kernel_read_file+0x230/0x290
[ 12.031972] ? __do_sys_finit_module+0xc8/0x140
[ 12.031975] ? __do_sys_finit_module+0xc8/0x140
[ 12.031979] ? __x64_sys_finit_module+0x18/0x20
[ 12.031982] ? do_syscall_64+0x5c/0x90
[ 12.031985] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.031989] </TASK>
[ 12.106963] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 63 jiffies s: 49 root: 0x1/.
[ 12.107003] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.107025] Task dump for CPU 0:
[ 12.107027] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.107032] Call Trace:
[ 12.107033] <TASK>
[ 12.107035] ? find_kallsyms_symbol+0x8e/0x1a0
[ 12.107040] ? amdgpu_ras_query_err_status+0x100/0x100 [amdgpu]
[ 12.107326] ? amdgpu_mes_free_process_doorbells+0x30/0x30 [amdgpu]
[ 12.107640] ? module_address_lookup+0x68/0xc0
[ 12.107644] ? amdgpu_mes_fini+0x60/0x60 [amdgpu]
[ 12.107958] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.107962] ? kallsyms_lookup+0x14/0x20
[ 12.107965] ? test_for_valid_rec+0x38/0x80
[ 12.107969] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.107973] ? ftrace_module_enable+0xa6/0x210
[ 12.107977] ? load_module+0xa93/0xd30
[ 12.107979] ? security_kernel_post_read_file+0x5c/0x70
[ 12.107982] ? kernel_read_file+0x230/0x290
[ 12.107986] ? __do_sys_finit_module+0xc8/0x140
[ 12.107989] ? __do_sys_finit_module+0xc8/0x140
[ 12.107993] ? __x64_sys_finit_module+0x18/0x20
[ 12.107995] ? do_syscall_64+0x5c/0x90
[ 12.107998] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.108003] </TASK>
[ 12.182963] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 82 jiffies s: 49 root: 0x1/.
[ 12.183003] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.183025] Task dump for CPU 0:
[ 12.183026] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.183031] Call Trace:
[ 12.183033] <TASK>
[ 12.183035] ? find_kallsyms_symbol+0x8e/0x1a0
[ 12.183040] ? amdgpu_ras_query_err_status+0x100/0x100 [amdgpu]
[ 12.183327] ? smuio_v11_0_update_rom_clock_gating+0x150/0x150 [amdgpu]
[ 12.183648] ? module_address_lookup+0x68/0xc0
[ 12.183651] ? smuio_v11_0_6_get_clock_gating_state+0xa0/0xa0 [amdgpu]
[ 12.183972] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.183976] ? kallsyms_lookup+0x14/0x20
[ 12.183979] ? test_for_valid_rec+0x38/0x80
[ 12.183983] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.183987] ? ftrace_module_enable+0xa6/0x210
[ 12.183990] ? load_module+0xa93/0xd30
[ 12.183993] ? security_kernel_post_read_file+0x5c/0x70
[ 12.183996] ? kernel_read_file+0x230/0x290
[ 12.184000] ? __do_sys_finit_module+0xc8/0x140
[ 12.184002] ? __do_sys_finit_module+0xc8/0x140
[ 12.184007] ? __x64_sys_finit_module+0x18/0x20
[ 12.184009] ? do_syscall_64+0x5c/0x90
[ 12.184012] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.184017] </TASK>
[ 12.258963] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 101 jiffies s: 49 root: 0x1/.
[ 12.259002] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.259024] Task dump for CPU 0:
[ 12.259026] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.259031] Call Trace:
[ 12.259032] <TASK>
[ 12.259034] ? find_kallsyms_symbol+0x8e/0x1a0
[ 12.259039] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.259367] ? svm_range_list_init+0x170/0x170 [amdgpu]
[ 12.259700] ? module_address_lookup+0x68/0xc0
[ 12.259703] ? svm_range_schedule_evict_svm_bo+0x80/0x80 [amdgpu]
[ 12.260036] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.260040] ? kallsyms_lookup+0x14/0x20
[ 12.260043] ? test_for_valid_rec+0x38/0x80
[ 12.260047] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.260051] ? ftrace_module_enable+0xa6/0x210
[ 12.260054] ? load_module+0xa93/0xd30
[ 12.260057] ? security_kernel_post_read_file+0x5c/0x70
[ 12.260060] ? kernel_read_file+0x230/0x290
[ 12.260064] ? __do_sys_finit_module+0xc8/0x140
[ 12.260066] ? __do_sys_finit_module+0xc8/0x140
[ 12.260070] ? __x64_sys_finit_module+0x18/0x20
[ 12.260073] ? do_syscall_64+0x5c/0x90
[ 12.260076] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.260080] </TASK>
[ 12.334967] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 120 jiffies s: 49 root: 0x1/.
[ 12.335007] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.335029] Task dump for CPU 0:
[ 12.335030] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.335035] Call Trace:
[ 12.335037] <TASK>
[ 12.335039] ? find_kallsyms_symbol+0x101/0x1a0
[ 12.335043] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.335371] ? smu_v13_0_get_current_pcie_link_width+0x60/0x60 [amdgpu]
[ 12.335714] ? module_address_lookup+0x68/0xc0
[ 12.335717] ? smu_v13_0_set_vcn_enable+0xa0/0xa0 [amdgpu]
[ 12.336060] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.336064] ? kallsyms_lookup+0x14/0x20
[ 12.336067] ? test_for_valid_rec+0x38/0x80
[ 12.336070] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.336075] ? ftrace_module_enable+0xa6/0x210
[ 12.336078] ? load_module+0xa93/0xd30
[ 12.336080] ? security_kernel_post_read_file+0x5c/0x70
[ 12.336084] ? kernel_read_file+0x230/0x290
[ 12.336087] ? __do_sys_finit_module+0xc8/0x140
[ 12.336090] ? __do_sys_finit_module+0xc8/0x140
[ 12.336094] ? __x64_sys_finit_module+0x18/0x20
[ 12.336097] ? do_syscall_64+0x5c/0x90
[ 12.336100] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.336104] </TASK>
[ 12.410962] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 139 jiffies s: 49 root: 0x1/.
[ 12.411002] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.411024] Task dump for CPU 0:
[ 12.411025] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.411030] Call Trace:
[ 12.411032] <TASK>
[ 12.411034] ? find_kallsyms_symbol+0x8e/0x1a0
[ 12.411038] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.411366] ? init_non_clock_fields.isra.0+0x210/0x210 [amdgpu]
[ 12.411718] ? module_address_lookup+0x68/0xc0
[ 12.411722] ? get_clock_voltage_dependency_table.constprop.0+0x90/0x90 [amdgpu]
[ 12.412074] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.412078] ? kallsyms_lookup+0x14/0x20
[ 12.412081] ? test_for_valid_rec+0x38/0x80
[ 12.412085] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.412089] ? ftrace_module_enable+0xa6/0x210
[ 12.412092] ? load_module+0xa93/0xd30
[ 12.412095] ? security_kernel_post_read_file+0x5c/0x70
[ 12.412098] ? kernel_read_file+0x230/0x290
[ 12.412101] ? __do_sys_finit_module+0xc8/0x140
[ 12.412104] ? __do_sys_finit_module+0xc8/0x140
[ 12.412108] ? __x64_sys_finit_module+0x18/0x20
[ 12.412111] ? do_syscall_64+0x5c/0x90
[ 12.412114] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.412118] </TASK>
[ 12.486964] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 158 jiffies s: 49 root: 0x1/.
[ 12.487004] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.487026] Task dump for CPU 0:
[ 12.487028] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.487033] Call Trace:
[ 12.487034] <TASK>
[ 12.487036] ? find_kallsyms_symbol+0x8e/0x1a0
[ 12.487040] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.487368] ? vega20_get_thermal_temperature_range+0xd0/0xd0 [amdgpu]
[ 12.487730] ? module_address_lookup+0x68/0xc0
[ 12.487733] ? vega20_notify_cac_buffer_info+0x90/0x90 [amdgpu]
[ 12.488095] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.488099] ? kallsyms_lookup+0x14/0x20
[ 12.488102] ? test_for_valid_rec+0x38/0x80
[ 12.488105] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.488109] ? ftrace_module_enable+0xa6/0x210
[ 12.488113] ? load_module+0xa93/0xd30
[ 12.488115] ? security_kernel_post_read_file+0x5c/0x70
[ 12.488118] ? kernel_read_file+0x230/0x290
[ 12.488122] ? __do_sys_finit_module+0xc8/0x140
[ 12.488125] ? __do_sys_finit_module+0xc8/0x140
[ 12.488129] ? __x64_sys_finit_module+0x18/0x20
[ 12.488132] ? do_syscall_64+0x5c/0x90
[ 12.488135] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.488139] </TASK>
[ 12.562961] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 177 jiffies s: 49 root: 0x1/.
[ 12.563001] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.563023] Task dump for CPU 0:
[ 12.563024] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.563029] Call Trace:
[ 12.563031] <TASK>
[ 12.563033] ? find_kallsyms_symbol+0xf1/0x1a0
[ 12.563037] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.563365] ? __traceiter_amdgpu_dm_atomic_update_cursor+0x40/0x40 [amdgpu]
[ 12.563734] ? module_address_lookup+0x68/0xc0
[ 12.563737] ? __traceiter_amdgpu_dm_atomic_commit_tail_finish+0x40/0x40 [amdgpu]
[ 12.564105] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.564109] ? kallsyms_lookup+0x14/0x20
[ 12.564112] ? test_for_valid_rec+0x38/0x80
[ 12.564116] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.564120] ? ftrace_module_enable+0xa6/0x210
[ 12.564123] ? load_module+0xa93/0xd30
[ 12.564126] ? security_kernel_post_read_file+0x5c/0x70
[ 12.564129] ? kernel_read_file+0x230/0x290
[ 12.564132] ? __do_sys_finit_module+0xc8/0x140
[ 12.564135] ? __do_sys_finit_module+0xc8/0x140
[ 12.564139] ? __x64_sys_finit_module+0x18/0x20
[ 12.564142] ? do_syscall_64+0x5c/0x90
[ 12.564145] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.564149] </TASK>
[ 12.638963] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 196 jiffies s: 49 root: 0x1/.
[ 12.639005] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.639027] Task dump for CPU 0:
[ 12.639029] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.639034] Call Trace:
[ 12.639035] <TASK>
[ 12.639038] ? find_kallsyms_symbol+0x9a/0x1a0
[ 12.639042] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.639379] ? dal_bios_parser_init_cmd_tbl_helper2+0xc0/0xc0 [amdgpu]
[ 12.639753] ? module_address_lookup+0x68/0xc0
[ 12.639757] ? dal_cmd_table_helper_encoder_mode_bp_to_atom2+0x80/0x80 [amdgpu]
[ 12.640131] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.640135] ? kallsyms_lookup+0x14/0x20
[ 12.640138] ? test_for_valid_rec+0x38/0x80
[ 12.640142] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.640146] ? ftrace_module_enable+0xa6/0x210
[ 12.640149] ? load_module+0xa93/0xd30
[ 12.640152] ? security_kernel_post_read_file+0x5c/0x70
[ 12.640155] ? kernel_read_file+0x230/0x290
[ 12.640159] ? __do_sys_finit_module+0xc8/0x140
[ 12.640161] ? __do_sys_finit_module+0xc8/0x140
[ 12.640166] ? __x64_sys_finit_module+0x18/0x20
[ 12.640168] ? do_syscall_64+0x5c/0x90
[ 12.640172] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.640176] </TASK>
[ 12.714962] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 215 jiffies s: 49 root: 0x1/.
[ 12.715002] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.715024] Task dump for CPU 0:
[ 12.715025] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.715031] Call Trace:
[ 12.715032] <TASK>
[ 12.715034] ? find_kallsyms_symbol+0x16f/0x1a0
[ 12.715038] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.715366] ? dcn3_set_hard_min_memclk+0xf0/0xf0 [amdgpu]
[ 12.715744] ? module_address_lookup+0x68/0xc0
[ 12.715747] ? dcn3_set_hard_max_memclk+0x80/0x80 [amdgpu]
[ 12.716125] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.716129] ? kallsyms_lookup+0x14/0x20
[ 12.716132] ? test_for_valid_rec+0x38/0x80
[ 12.716135] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.716139] ? ftrace_module_enable+0xa6/0x210
[ 12.716143] ? load_module+0xa93/0xd30
[ 12.716145] ? security_kernel_post_read_file+0x5c/0x70
[ 12.716148] ? kernel_read_file+0x230/0x290
[ 12.716152] ? __do_sys_finit_module+0xc8/0x140
[ 12.716155] ? __do_sys_finit_module+0xc8/0x140
[ 12.716159] ? __x64_sys_finit_module+0x18/0x20
[ 12.716162] ? do_syscall_64+0x5c/0x90
[ 12.716165] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.716169] </TASK>
[ 12.790963] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 234 jiffies s: 49 root: 0x1/.
[ 12.791005] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.791027] Task dump for CPU 0:
[ 12.791029] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.791034] Call Trace:
[ 12.791035] <TASK>
[ 12.791037] ? find_kallsyms_symbol+0x8e/0x1a0
[ 12.791042] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.791370] ? define_generic_registers+0xc0/0xc0 [amdgpu]
[ 12.791751] ? module_address_lookup+0x68/0xc0
[ 12.791755] ? offset_to_id+0x1e0/0x1e0 [amdgpu]
[ 12.792136] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.792140] ? kallsyms_lookup+0x14/0x20
[ 12.792143] ? test_for_valid_rec+0x38/0x80
[ 12.792146] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.792150] ? ftrace_module_enable+0xa6/0x210
[ 12.792154] ? load_module+0xa93/0xd30
[ 12.792156] ? security_kernel_post_read_file+0x5c/0x70
[ 12.792159] ? kernel_read_file+0x230/0x290
[ 12.792163] ? __do_sys_finit_module+0xc8/0x140
[ 12.792166] ? __do_sys_finit_module+0xc8/0x140
[ 12.792170] ? __x64_sys_finit_module+0x18/0x20
[ 12.792173] ? do_syscall_64+0x5c/0x90
[ 12.792176] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.792180] </TASK>
[ 12.866962] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 253 jiffies s: 49 root: 0x1/.
[ 12.867002] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.867023] Task dump for CPU 0:
[ 12.867025] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.867030] Call Trace:
[ 12.867032] <TASK>
[ 12.867034] ? find_kallsyms_symbol+0x16f/0x1a0
[ 12.867038] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.867366] ? dcn10_get_vupdate_offset_from_vsync+0x90/0x90 [amdgpu]
[ 12.867746] ? module_address_lookup+0x68/0xc0
[ 12.867749] ? dcn10_setup_vupdate_interrupt+0x50/0x50 [amdgpu]
[ 12.868130] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.868134] ? kallsyms_lookup+0x14/0x20
[ 12.868137] ? test_for_valid_rec+0x38/0x80
[ 12.868140] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.868144] ? ftrace_module_enable+0xa6/0x210
[ 12.868147] ? load_module+0xa93/0xd30
[ 12.868150] ? security_kernel_post_read_file+0x5c/0x70
[ 12.868153] ? kernel_read_file+0x230/0x290
[ 12.868157] ? __do_sys_finit_module+0xc8/0x140
[ 12.868159] ? __do_sys_finit_module+0xc8/0x140
[ 12.868164] ? __x64_sys_finit_module+0x18/0x20
[ 12.868166] ? do_syscall_64+0x5c/0x90
[ 12.868169] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.868173] </TASK>
[ 12.942962] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 272 jiffies s: 49 root: 0x1/.
[ 12.943002] rcu: blocking rcu_node structures (internal RCU debug):
[ 12.943023] Task dump for CPU 0:
[ 12.943025] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 12.943030] Call Trace:
[ 12.943032] <TASK>
[ 12.943034] ? find_kallsyms_symbol+0x8e/0x1a0
[ 12.943038] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 12.943366] ? dcn30_resource_destruct+0xb00/0xb00 [amdgpu]
[ 12.943743] ? module_address_lookup+0x68/0xc0
[ 12.943746] ? dcn30_acquire_post_bldn_3dlut+0x200/0x200 [amdgpu]
[ 12.944124] ? kallsyms_lookup_buildid+0xf7/0x180
[ 12.944128] ? kallsyms_lookup+0x14/0x20
[ 12.944131] ? test_for_valid_rec+0x38/0x80
[ 12.944134] ? change_page_attr_set_clr+0x150/0x1c0
[ 12.944139] ? ftrace_module_enable+0xa6/0x210
[ 12.944142] ? load_module+0xa93/0xd30
[ 12.944145] ? security_kernel_post_read_file+0x5c/0x70
[ 12.944148] ? kernel_read_file+0x230/0x290
[ 12.944151] ? __do_sys_finit_module+0xc8/0x140
[ 12.944154] ? __do_sys_finit_module+0xc8/0x140
[ 12.944158] ? __x64_sys_finit_module+0x18/0x20
[ 12.944161] ? do_syscall_64+0x5c/0x90
[ 12.944164] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 12.944168] </TASK>
[ 13.018965] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 291 jiffies s: 49 root: 0x1/.
[ 13.019004] rcu: blocking rcu_node structures (internal RCU debug):
[ 13.019026] Task dump for CPU 0:
[ 13.019028] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 13.019033] Call Trace:
[ 13.019034] <TASK>
[ 13.019036] ? find_kallsyms_symbol+0x85/0x1a0
[ 13.019041] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 13.019369] ? dce60_validate_global+0xd0/0xd0 [amdgpu]
[ 13.019748] ? module_address_lookup+0x68/0xc0
[ 13.019752] ? read_dce_straps+0x70/0x70 [amdgpu]
[ 13.020131] ? kallsyms_lookup_buildid+0xf7/0x180
[ 13.020135] ? kallsyms_lookup+0x14/0x20
[ 13.020138] ? test_for_valid_rec+0x38/0x80
[ 13.020141] ? change_page_attr_set_clr+0x150/0x1c0
[ 13.020146] ? ftrace_module_enable+0xa6/0x210
[ 13.020149] ? load_module+0xa93/0xd30
[ 13.020151] ? security_kernel_post_read_file+0x5c/0x70
[ 13.020154] ? kernel_read_file+0x230/0x290
[ 13.020158] ? __do_sys_finit_module+0xc8/0x140
[ 13.020161] ? __do_sys_finit_module+0xc8/0x140
[ 13.020165] ? __x64_sys_finit_module+0x18/0x20
[ 13.020168] ? do_syscall_64+0x5c/0x90
[ 13.020171] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 13.020175] </TASK>
[ 13.094962] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 310 jiffies s: 49 root: 0x1/.
[ 13.095002] rcu: blocking rcu_node structures (internal RCU debug):
[ 13.095024] Task dump for CPU 0:
[ 13.095025] task:systemd-udevd state:R running task stack: 0 pid: 383 ppid: 357 flags:0x0000400a
[ 13.095030] Call Trace:
[ 13.095032] <TASK>
[ 13.095034] ? find_kallsyms_symbol+0x77/0x1a0
[ 13.095038] ? kfd_process_alloc_gpuvm+0x110/0x110 [amdgpu]
[ 13.095366] ? build_freesync_hdr.constprop.0.isra.0+0x560/0x560 [amdgpu]
[ 13.095739] ? module_address_lookup+0x68/0xc0
[ 13.095742] ? precompute_pq+0xa0/0xa0 [amdgpu]
[ 13.096115] ? kallsyms_lookup_buildid+0xf7/0x180
[ 13.096119] ? kallsyms_lookup+0x14/0x20
[ 13.096122] ? test_for_valid_rec+0x38/0x80
[ 13.096126] ? change_page_attr_set_clr+0x150/0x1c0
[ 13.096130] ? ftrace_module_enable+0xa6/0x210
[ 13.096133] ? load_module+0xa93/0xd30
[ 13.096136] ? security_kernel_post_read_file+0x5c/0x70
[ 13.096139] ? kernel_read_file+0x230/0x290
[ 13.096142] ? __do_sys_finit_module+0xc8/0x140
[ 13.096145] ? __do_sys_finit_module+0xc8/0x140
[ 13.096149] ? __x64_sys_finit_module+0x18/0x20
[ 13.096152] ? do_syscall_64+0x5c/0x90
[ 13.096155] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 13.096159] </TASK>
If it is caused by the last line before:
>[ 11.431622] AMD-Vi: AMD IOMMUv2 functionality not available on this system - This is not a bug.
..., and this is not a bug, I don't think it is normal to see all the time a lot of traces by default about functionality which is absent.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
DistroRelease: Ubuntu 22.04
InstallationDate: Installed on 2019-04-13 (1208 days ago)
InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.1)
Package: linux (not installed)
Tags: jammy wayland-session
Uname: Linux 5.19.0-051900-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: Upgraded to jammy on 2022-04-22 (103 days ago)
UserGroups: adm cdrom dip libvirt lpadmin plugdev sambashare sudo
_MarkForUpload: True
apport information