Created attachment 1828048 [details] dmesg First seen with these kernels: 5.15.0-0.rc2.18.fc36.x86_64+debug 5.15.0-0.rc3.25.fc36.x86_64+debug Did not see it with 5.14 series, but also didn't test any 5.15 kernel prior to rc2. There's actually two issues, not sure if they are related: 1. [ 9.054169] ============================= [ 9.054170] WARNING: suspicious RCU usage [ 9.054172] 5.15.0-0.rc3.25.fc36.x86_64+debug #1 Not tainted [ 9.054173] ----------------------------- [ 9.054175] drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c:263 suspicious rcu_dereference_protected() usage! [ 9.054178] other info that might help us debug this: [ 9.054180] rcu_scheduler_active = 2, debug_locks = 1 [ 9.054182] 3 locks held by modprobe/670: [ 9.054185] #0: ffffffffc0d160f0 (iwlwifi_opmode_table_mtx){+.+.}-{3:3}, at: iwl_opmode_register+0x2c/0xe0 [iwlwifi] [ 9.054209] #1: ffffffffa21ee910 (rtnl_mutex){+.+.}-{3:3}, at: iwl_op_mode_mvm_start+0xa41/0xce0 [iwlmvm] [ 9.054239] #2: ffff9f6586cc3608 (&mvm->mutex){+.+.}-{3:3}, at: iwl_op_mode_mvm_start+0xa4d/0xce0 [iwlmvm] [ 9.054260] stack backtrace: [ 9.054261] CPU: 7 PID: 670 Comm: modprobe Not tainted 5.15.0-0.rc3.25.fc36.x86_64+debug #1 [ 9.054264] Hardware name: LENOVO 20QDS3E200/20QDS3E200, BIOS N2HET63W (1.46 ) 06/01/2021 [ 9.054265] Call Trace: [ 9.054268] dump_stack_lvl+0x57/0x72 [ 9.054273] iwl_mvm_init_fw_regd+0x110/0x170 [iwlmvm] [ 9.054292] iwl_mvm_init_mcc+0x42/0x1b0 [iwlmvm] [ 9.054308] iwl_op_mode_mvm_start+0xc8e/0xce0 [iwlmvm] [ 9.054332] _iwl_op_mode_start.isra.0+0x3f/0x80 [iwlwifi] [ 9.054349] iwl_opmode_register+0x6f/0xe0 [iwlwifi] [ 9.054363] ? 0xffffffffc0be0000 [ 9.054367] iwl_mvm_init+0x36/0x1000 [iwlmvm] [ 9.054383] do_one_initcall+0x64/0x320 [ 9.054389] ? rcu_read_lock_sched_held+0x3f/0x80 [ 9.054393] ? trace_kmalloc+0x38/0xe0 [ 9.054396] ? kmem_cache_alloc_trace+0x17c/0x280 [ 9.054405] do_init_module+0x5c/0x270 [ 9.054409] __do_sys_init_module+0x130/0x190 [ 9.054427] do_syscall_64+0x38/0x90 [ 9.054433] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 9.054437] RIP: 0033:0x7ff05073b97e [ 9.054441] Code: 48 8b 0d ad 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 7a 74 0e 00 f7 d8 64 89 01 48 [ 9.054444] RSP: 002b:00007ffce3da9378 EFLAGS: 00000246 ORIG_RAX: 00000000000000af [ 9.054448] RAX: ffffffffffffffda RBX: 00005645f1041db0 RCX: 00007ff05073b97e [ 9.054450] RDX: 00005645ef77ba2a RSI: 00000000000fb6e6 RDI: 00005645f1ad0180 [ 9.054452] RBP: 00005645f1ad0180 R08: 00005645f1044cc0 R09: 00000000000fa010 [ 9.054454] R10: 0000000000000005 R11: 0000000000000246 R12: 00005645ef77ba2a [ 9.054456] R13: 00005645f1041ec0 R14: 00005645f1041db0 R15: 00005645f1044dd0 [ 9.061824] ------------[ cut here ]------------ [ 9.061829] WARNING: CPU: 5 PID: 670 at net/wireless/reg.c:3107 reg_process_self_managed_hint+0x198/0x1e0 [cfg80211] [ 9.061883] Modules linked in: snd_soc_core(+) kvm_intel(+) pcc_cpufreq(-) iTCO_wdt(+) snd_compress intel_pmc_bxt ac97_bus snd_pcm_dmaengine iTCO_vendor_support mei_hdcp mei_wdt snd_hda_intel kvm intel_rapl_msr snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec irqbypass iwlmvm(+) snd_hda_core rapl snd_hwdep intel_cstate snd_seq mac80211 snd_seq_device intel_uncore snd_pcm uvcvideo think_lmi(+) libarc4 firmware_attributes_class intel_wmi_thunderbolt wmi_bmof videobuf2_vmalloc btusb i2c_i801 videobuf2_memops snd_timer videobuf2_v4l2 videobuf2_common i2c_smbus thunderbolt btrtl btbcm iwlwifi videodev btintel mei_me processor_thermal_device_pci_legacy processor_thermal_device bluetooth joydev mc processor_thermal_rfim mei cfg80211 thinkpad_acpi ucsi_acpi processor_thermal_mbox idma64 ledtrig_audio ecdh_generic typec_ucsi processor_thermal_rapl platform_profile intel_rapl_common typec intel_pch_thermal intel_soc_dts_iosf rfkill snd int3403_thermal soundcore int340x_thermal_zone acpi_pad [ 9.062083] acpi_tad int3400_thermal acpi_thermal_rel zram ip_tables i915 hid_multitouch crct10dif_pclmul i2c_algo_bit crc32_pclmul crc32c_intel ttm drm_kms_helper ghash_clmulni_intel cec serio_raw e1000e drm nvme nvme_core i2c_hid_acpi i2c_hid wmi video pinctrl_cannonlake fuse [ 9.062158] CPU: 5 PID: 670 Comm: modprobe Not tainted 5.15.0-0.rc3.25.fc36.x86_64+debug #1 [ 9.062164] Hardware name: LENOVO 20QDS3E200/20QDS3E200, BIOS N2HET63W (1.46 ) 06/01/2021 [ 9.062168] RIP: 0010:reg_process_self_managed_hint+0x198/0x1e0 [cfg80211] [ 9.062211] Code: 0e 01 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 50 f1 35 e0 85 c0 0f 85 b8 fe ff ff <0f> 0b e9 b1 fe ff ff 0f 0b 80 3d 47 bf 0b 00 00 0f 85 94 fe ff ff [ 9.062214] RSP: 0018:ffffc353c141bc50 EFLAGS: 00010246 [ 9.062219] RAX: 0000000000000000 RBX: ffff9f6586cc3568 RCX: 0000000000000001 [ 9.062223] RDX: 0000000000000002 RSI: ffff9f6586cc0650 RDI: ffff9f658701c410 [ 9.062225] RBP: ffffc353c141bcc8 R08: 0000000000000000 R09: 0000000000000001 [ 9.062228] R10: ffffffffa372c720 R11: 0000000000000000 R12: ffff9f6586cc05e0 [ 9.062231] R13: ffff9f6586cc3568 R14: ffffc353c141bd30 R15: ffff9f6586cc3560 [ 9.062236] FS: 00007ff050624740(0000) GS:ffff9f68ee400000(0000) knlGS:0000000000000000 [ 9.062239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9.062242] CR2: 00005572b3a19440 CR3: 00000001029ca006 CR4: 00000000003706e0 [ 9.062246] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 9.062249] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 9.062252] Call Trace: [ 9.062258] ? kfree+0x319/0x4c0 [ 9.062282] regulatory_set_wiphy_regd_sync+0x31/0x90 [cfg80211] [ 9.062321] iwl_mvm_init_mcc+0xa9/0x1b0 [iwlmvm] [ 9.062352] iwl_op_mode_mvm_start+0xc8e/0xce0 [iwlmvm] [ 9.062384] _iwl_op_mode_start.isra.0+0x3f/0x80 [iwlwifi] [ 9.062404] iwl_opmode_register+0x6f/0xe0 [iwlwifi] [ 9.062416] ? 0xffffffffc0be0000 [ 9.062423] iwl_mvm_init+0x36/0x1000 [iwlmvm] [ 9.062438] do_one_initcall+0x64/0x320 [ 9.062445] ? rcu_read_lock_sched_held+0x3f/0x80 [ 9.062450] ? trace_kmalloc+0x38/0xe0 [ 9.062455] ? kmem_cache_alloc_trace+0x17c/0x280 [ 9.062464] do_init_module+0x5c/0x270 [ 9.062471] __do_sys_init_module+0x130/0x190 [ 9.062496] do_syscall_64+0x38/0x90 [ 9.062504] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 9.062509] RIP: 0033:0x7ff05073b97e [ 9.062514] Code: 48 8b 0d ad 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 7a 74 0e 00 f7 d8 64 89 01 48 [ 9.062517] RSP: 002b:00007ffce3da9378 EFLAGS: 00000246 ORIG_RAX: 00000000000000af [ 9.062523] RAX: ffffffffffffffda RBX: 00005645f1041db0 RCX: 00007ff05073b97e [ 9.062526] RDX: 00005645ef77ba2a RSI: 00000000000fb6e6 RDI: 00005645f1ad0180 [ 9.062529] RBP: 00005645f1ad0180 R08: 00005645f1044cc0 R09: 00000000000fa010 [ 9.062554] R10: 0000000000000005 R11: 0000000000000246 R12: 00005645ef77ba2a [ 9.062557] R13: 00005645f1041ec0 R14: 00005645f1041db0 R15: 00005645f1044dd0 [ 9.062580] irq event stamp: 149273 [ 9.062583] hardirqs last enabled at (149281): [<ffffffffa0e00e42>] asm_sysvec_call_function+0x12/0x20 [ 9.062588] hardirqs last disabled at (149288): [<ffffffffa01727a5>] __up_console_sem+0x45/0x70 [ 9.062594] softirqs last enabled at (149246): [<ffffffffa00ec798>] __irq_exit_rcu+0xd8/0x110 [ 9.062599] softirqs last disabled at (149237): [<ffffffffa00ec798>] __irq_exit_rcu+0xd8/0x110 [ 9.062603] ---[ end trace fec5843beb08d839 ]--- 2. these appear in red text [ 23.150258] iwlwifi 0000:00:14.3: Unhandled alg: 0xc0400707 [ 23.150380] iwlwifi 0000:00:14.3: Unhandled alg: 0xc0400707
[ 8.481619] iwlwifi 0000:00:14.3: loaded firmware version 46.6b541b68.0 9000-pu-b0-jf-b0-46.ucode op_mode iwlmvm [ 8.919971] iwlwifi 0000:00:14.3: Detected Intel(R) Wireless-AC 9560 160MHz, REV=0x318 iwl7260-firmware-1:25.30.13.0-122.fc35.noarch linux-firmware-20210818-122.fc35.noarch NOTE: it's a rawhide/36 kernel with Fedora 35 user space, but at the moment 35 and 36 have the same firmware version.
Upstream thread: https://lore.kernel.org/linux-wireless/CAJCQCtR28JZaqNC053jEpoZGN37kRK9ReYX0Kt8+ukRGnO5z_Q@mail.gmail.com/T/#u
Still in 5.16.0-0.rc2.18.fc36.x86_64+debug
Created attachment 1843093 [details] dmesg 5.16-rc2
I am seeing the same with 5.15.4 on Fedora 35
There is a patch for this. https://www.spinics.net/lists/linux-wireless/msg217277.html I rebuilt a kernel with the patch applied and I no longer see the error.
(In reply to Jason Montleon from comment #6) > There is a patch for this. > https://www.spinics.net/lists/linux-wireless/msg217277.html > > I rebuilt a kernel with the patch applied and I no longer see the error. Thank you for pointing out the fix for this, this fix has landed upstream in 5.16.0-rc4 and I can confirm that with 5.16.0-rc4 the "suspicious RCU usage" warning is gone.
This is fixed in 5.15.7 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.7