Hello,
I have noticed an RCU warning in my dmesg with
5.16.0-0.rc1.20211118git8ab774587903.200.s0ix01.fc35.x86_64. Not sure
whether this is a problem. My card is:
01:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)
[ 16.404061] =============================
[ 16.404063] WARNING: suspicious RCU usage
[ 16.404066]
5.16.0-0.rc1.20211118git8ab774587903.200.s0ix01.fc35.x86_64 #1 Not tainted
[ 16.404070] -----------------------------
[ 16.404072] drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c:264
suspicious rcu_dereference_protected() usage!
[ 16.404076]
other info that might help us debug this:
[ 16.404079]
rcu_scheduler_active = 2, debug_locks = 1
[ 16.404082] 3 locks held by modprobe/705:
[ 16.404086] #0: ffffffffc11bc0f0
(iwlwifi_opmode_table_mtx){+.+.}-{3:3}, at:
iwl_opmode_register+0x2c/0xe0 [iwlwifi]
[ 16.404124] #1: ffffffffbc40dc10 (rtnl_mutex){+.+.}-{3:3}, at:
iwl_op_mode_mvm_start+0xa49/0xcf0 [iwlmvm]
[ 16.404169] #2: ffff90bd496eb688 (&mvm->mutex){+.+.}-{3:3}, at:
iwl_op_mode_mvm_start+0xa55/0xcf0 [iwlmvm]
[ 16.404203]
stack backtrace:
[ 16.404207] CPU: 0 PID: 705 Comm: modprobe Not tainted
5.16.0-0.rc1.20211118git8ab774587903.200.s0ix01.fc35.x86_64 #1
[ 16.404212] Hardware name: ASUSTeK COMPUTER INC. ZenBook
UX425IA_UM425IA/UX425IA, BIOS UX425IA.309 01/29/2021
[ 16.404215] Call Trace:
[ 16.404218] <TASK>
[ 16.404222] dump_stack_lvl+0x59/0x73
[ 16.404233] iwl_mvm_init_fw_regd+0x110/0x170 [iwlmvm]
[ 16.404262] iwl_mvm_init_mcc+0x42/0x1b0 [iwlmvm]
[ 16.404288] iwl_op_mode_mvm_start+0xc94/0xcf0 [iwlmvm]
[ 16.404329] _iwl_op_mode_start.isra.0+0x42/0x80 [iwlwifi]
[ 16.404357] iwl_opmode_register+0x6f/0xe0 [iwlwifi]
[ 16.404381] ? 0xffffffffc14d9000
[ 16.404389] iwl_mvm_init+0x36/0x1000 [iwlmvm]
[ 16.404414] do_one_initcall+0x67/0x350
[ 16.404422] ? rcu_read_lock_sched_held+0x3f/0x70
[ 16.404428] ? trace_kmalloc+0x38/0x100
[ 16.404433] ? kmem_cache_alloc_trace+0x1ee/0x3a0
[ 16.404446] do_init_module+0x5c/0x280
[ 16.404455] __do_sys_init_module+0x130/0x190
[ 16.404485] do_syscall_64+0x3b/0x90
[ 16.404494] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 16.404500] RIP: 0033:0x7fa8ae78b99e
[ 16.404505] Code: 48 8b 0d 8d 74 0e 00 f7 d8 64 89 01 48 83 c8 ff c3
66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 5a 74 0e 00 f7 d8 64 89 01 48
[ 16.404509] RSP: 002b:00007ffc0d0e8408 EFLAGS: 00000246 ORIG_RAX:
00000000000000af
[ 16.404515] RAX: ffffffffffffffda RBX: 000055ca40ef1d00 RCX:
00007fa8ae78b99e
[ 16.404519] RDX: 000055ca40c7ca2a RSI: 000000000152b1d4 RDI:
00007fa8a8ddf010
[ 16.404522] RBP: 00007fa8a8ddf010 R08: 000055ca40ef4db0 R09:
000000000152b000
[ 16.404525] R10: 0000000000000005 R11: 0000000000000246 R12:
000055ca40c7ca2a
[ 16.404528] R13: 000055ca40ef1e30 R14: 000055ca40ef1d00 R15:
000055ca40ef4ec0
[ 16.404555] </TASK>
[ 16.405529] ------------[ cut here ]------------
[ 16.405535] WARNING: CPU: 0 PID: 705 at net/wireless/reg.c:3107
reg_process_self_managed_hint+0x198/0x1e0 [cfg80211]
[ 16.405591] Modules linked in: vfat fat iwlmvm(+) mac80211
intel_rapl_msr intel_rapl_common edac_mce_amd snd_soc_dmic kvm_amd kvm
snd_acp3x_rn snd_acp3x_pdm_dma snd_soc_core snd_hda_codec_realtek
snd_hda_codec_generic libarc4 snd_hda_codec_hdmi snd_compress
ledtrig_audio ac97_bus btusb snd_pcm_dmaengine snd_hda_intel iwlwifi
btrtl snd_intel_dspcfg snd_intel_sdw_acpi btbcm snd_hda_codec btintel
snd_hda_core uvcvideo irqbypass bluetooth videobuf2_vmalloc rapl
videobuf2_memops snd_hwdep videobuf2_v4l2 videobuf2_common snd_seq
asus_nb_wmi asus_wmi pcspkr videodev cfg80211 snd_seq_device
sparse_keymap wmi_bmof platform_profile snd_pcm joydev snd_pci_acp5x mc
snd_timer i2c_piix4 k10temp snd_rn_pci_acp3x ecdh_generic snd_pci_acp3x
snd rfkill soundcore cm32181 industrialio acpi_cpufreq amd_pmc
binfmt_misc zram ip_tables amdgpu rtsx_pci_sdmmc mmc_core nvme
hid_multitouch nvme_core rtsx_pci ccp crct10dif_pclmul drm_ttm_helper
ttm crc32_pclmul crc32c_intel ghash_clmulni_intel serio_raw iommu_v2
[ 16.405793] ucsi_acpi sp5100_tco typec_ucsi gpu_sched typec wmi
video i2c_hid_acpi i2c_hid ipmi_devintf ipmi_msghandler fuse
[ 16.405825] CPU: 0 PID: 705 Comm: modprobe Not tainted
5.16.0-0.rc1.20211118git8ab774587903.200.s0ix01.fc35.x86_64 #1
[ 16.405830] Hardware name: ASUSTeK COMPUTER INC. ZenBook
UX425IA_UM425IA/UX425IA, BIOS UX425IA.309 01/29/2021
[ 16.405834] RIP: 0010:reg_process_self_managed_hint+0x198/0x1e0
[cfg80211]
[ 16.405882] Code: ae 09 03 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 49 8d 7c 24 70 be ff ff ff ff e8 80 13 f8 f9 85 c0 0f 85 b8 fe ff
ff <0f> 0b e9 b1 fe ff ff 0f 0b 80 3d b7 be 0b 00 00 0f 85 94 fe ff ff
[ 16.405886] RSP: 0018:ffff9e430234fc50 EFLAGS: 00010246
[ 16.405893] RAX: 0000000000000000 RBX: ffff90bd496eb5e8 RCX:
0000000000000001
[ 16.405896] RDX: 0000000000000002 RSI: ffffffffbb809cad RDI:
ffffffffbb8a8416
[ 16.405900] RBP: ffff9e430234fcc8 R08: 00000003d1d7d8f4 R09:
0000000000000000
[ 16.405903] R10: 0000000000000001 R11: 0000000000000000 R12:
ffff90bd496e8640
[ 16.405906] R13: ffff90bd496eb5e8 R14: ffff9e430234fd30 R15:
ffff90bd496eb5e0
[ 16.405910] FS: 00007fa8ae674740(0000) GS:ffff90c03ba00000(0000)
knlGS:0000000000000000
[ 16.405914] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.405917] CR2: 00007f4ed482e140 CR3: 0000000106908000 CR4:
0000000000350ef0
[ 16.405921] Call Trace:
[ 16.405925] <TASK>
[ 16.405928] ? rcu_read_lock_sched_held+0x3f/0x70
[ 16.405953] regulatory_set_wiphy_regd_sync+0x31/0x90 [cfg80211]
[ 16.406003] iwl_mvm_init_mcc+0xa9/0x1b0 [iwlmvm]
[ 16.406040] iwl_op_mode_mvm_start+0xc94/0xcf0 [iwlmvm]
[ 16.406084] _iwl_op_mode_start.isra.0+0x42/0x80 [iwlwifi]
[ 16.406113] iwl_opmode_register+0x6f/0xe0 [iwlwifi]
[ 16.406138] ? 0xffffffffc14d9000
[ 16.406145] iwl_mvm_init+0x36/0x1000 [iwlmvm]
[ 16.406172] do_one_initcall+0x67/0x350
[ 16.406180] ? rcu_read_lock_sched_held+0x3f/0x70
[ 16.406185] ? trace_kmalloc+0x38/0x100
[ 16.406190] ? kmem_cache_alloc_trace+0x1ee/0x3a0
[ 16.406203] do_init_module+0x5c/0x280
[ 16.406212] __do_sys_init_module+0x130/0x190
[ 16.406268] do_syscall_64+0x3b/0x90
[ 16.406277] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 16.406283] RIP: 0033:0x7fa8ae78b99e
[ 16.406288] Code: 48 8b 0d 8d 74 0e 00 f7 d8 64 89 01 48 83 c8 ff c3
66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 5a 74 0e 00 f7 d8 64 89 01 48
[ 16.406292] RSP: 002b:00007ffc0d0e8408 EFLAGS: 00000246 ORIG_RAX:
00000000000000af
[ 16.406298] RAX: ffffffffffffffda RBX: 000055ca40ef1d00 RCX:
00007fa8ae78b99e
[ 16.406302] RDX: 000055ca40c7ca2a RSI: 000000000152b1d4 RDI:
00007fa8a8ddf010
[ 16.406305] RBP: 00007fa8a8ddf010 R08: 000055ca40ef4db0 R09:
000000000152b000
[ 16.406308] R10: 0000000000000005 R11: 0000000000000246 R12:
000055ca40c7ca2a
[ 16.406312] R13: 000055ca40ef1e30 R14: 000055ca40ef1d00 R15:
000055ca40ef4ec0
[ 16.406338] </TASK>
[ 16.406341] irq event stamp: 722337
[ 16.406344] hardirqs last enabled at (722343): [<ffffffffba179020>]
__up_console_sem+0x60/0x70
[ 16.406350] hardirqs last disabled at (722348): [<ffffffffba179005>]
__up_console_sem+0x45/0x70
[ 16.406355] softirqs last enabled at (721430): [<ffffffffba0f2827>]
__irq_exit_rcu+0x107/0x170
[ 16.406361] softirqs last disabled at (721421): [<ffffffffba0f2827>]
__irq_exit_rcu+0x107/0x170
[ 16.406366] ---[ end trace 8712d9fee8ea5eb3 ]---
Best regards,
Julian