Hi, On 11/29/21 13:37, Hans de Goede wrote: > Hi All, > > Since kernel 5.15 (IIRC) I've been getting a suspicous RCU usage warning > from the iwlwifi driver when running a kernel with checks for this enabled. > > Note this is the 2nd or 3th time this happens now, can we please get > some CI checks for these (assuming there is some iwlwifi CI already) ? > > Here is the warning which I'm getting: Note, also see: https://bugzilla.redhat.com/show_bug.cgi?id=2009750 Regards, Hans > > [ 71.769680] iwlwifi 0000:00:14.3: base HW address: 34:13:e8:dd:0f:63 > > [ 71.769708] ============================= > [ 71.769710] WARNING: suspicious RCU usage > [ 71.769711] 5.16.0-rc2+ #632 Tainted: G E > [ 71.769713] ----------------------------- > [ 71.769715] drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c:264 suspicious rcu_dereference_protected() usage! > [ 71.769717] > other info that might help us debug this: > > [ 71.769719] > rcu_scheduler_active = 2, debug_locks = 1 > [ 71.769721] 3 locks held by modprobe/1712: > [ 71.769723] #0: ffffffffc0d6e0e8 (iwlwifi_opmode_table_mtx){+.+.}-{3:3}, at: iwl_opmode_register+0x2c/0xe0 [iwlwifi] > [ 71.769744] #1: ffffffffa9bc2248 (rtnl_mutex){+.+.}-{3:3}, at: iwl_op_mode_mvm_start+0x9e7/0xc90 [iwlmvm] > [ 71.769771] #2: ffff8a9d0884b3a0 (&mvm->mutex){+.+.}-{3:3}, at: iwl_op_mode_mvm_start+0x9f3/0xc90 [iwlmvm] > [ 71.769789] > stack backtrace: > [ 71.769791] CPU: 3 PID: 1712 Comm: modprobe Tainted: G E 5.16.0-rc2+ #632 > [ 71.769794] Hardware name: LENOVO 20U90SIT19/20U90SIT19, BIOS N2WET30W (1.20 ) 08/26/2021 > [ 71.769795] Call Trace: > [ 71.769797] <TASK> > [ 71.769799] dump_stack_lvl+0x59/0x73 > [ 71.769805] iwl_mvm_init_fw_regd+0x110/0x170 [iwlmvm] > [ 71.769822] iwl_mvm_init_mcc+0x42/0x1b0 [iwlmvm] > [ 71.769837] iwl_op_mode_mvm_start+0xc32/0xc90 [iwlmvm] > [ 71.769859] _iwl_op_mode_start.isra.0+0x3f/0x80 [iwlwifi] > [ 71.769871] iwl_opmode_register+0x6f/0xe0 [iwlwifi] > [ 71.769881] ? 0xffffffffc0ef1000 > [ 71.769885] iwl_mvm_init+0x36/0x1000 [iwlmvm] > [ 71.769900] do_one_initcall+0x58/0x300 > [ 71.769904] ? rcu_read_lock_sched_held+0x3f/0x70 > [ 71.769908] ? trace_kmalloc+0x2c/0xd0 > [ 71.769912] ? kmem_cache_alloc_trace+0x1e8/0x3a0 > [ 71.769919] do_init_module+0x5c/0x260 > [ 71.769925] __do_sys_init_module+0x130/0x190 > [ 71.769942] do_syscall_64+0x38/0x90 > [ 71.769947] entry_SYSCALL_64_after_hwframe+0x44/0xae > [ 71.769950] RIP: 0033:0x7fa9255f599e > [ 71.769954] 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 > [ 71.769956] RSP: 002b:00007ffd859069e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000af > [ 71.769960] RAX: ffffffffffffffda RBX: 000055796d7dbe40 RCX: 00007fa9255f599e > [ 71.769962] RDX: 000055796d167a2a RSI: 00000000000fcf09 RDI: 000055796e264bf0 > [ 71.769963] RBP: 000055796e264bf0 R08: 000055796d7dbd90 R09: 00000000000fc010 > [ 71.769965] R10: 0000000000000005 R11: 0000000000000246 R12: 000055796d167a2a > [ 71.769967] R13: 000055796d7dbf70 R14: 000055796d7dbe40 R15: 000055796d7df170 > [ 71.769982] </TASK> > [ 71.773112] ------------[ cut here ]------------ > [ 71.773115] WARNING: CPU: 5 PID: 1712 at net/wireless/reg.c:3107 reg_process_self_managed_hint+0x198/0x1e0 [cfg80211] > [ 71.773157] Modules linked in: intel_uncore(+) snd_compress ac97_bus snd_pcm_dmaengine snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi cdc_ether usbnet snd_hda_codec iwlmvm(+) snd_usb_audio(+) pcspkr r8152 snd_hda_core snd_usbmidi_lib snd_rawmidi snd_hwdep mii mac80211 snd_seq uvcvideo snd_seq_device think_lmi(E+) videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 firmware_attributes_class(E) wmi_bmof(E) i2c_i801(E) snd_pcm e1000e(+) intel_wmi_thunderbolt(E) libarc4 btusb videobuf2_common btrtl i2c_smbus snd_timer btbcm videodev btintel bluetooth mc iwlwifi mei_me ecdh_generic thunderbolt(+) processor_thermal_device_pci_legacy mei processor_thermal_device cfg80211 joydev processor_thermal_rfim processor_thermal_mbox processor_thermal_rapl nxp_nci_i2c idma64 intel_rapl_common nxp_nci intel_pch_thermal nci intel_soc_dts_iosf nfc thinkpad_acpi(E) ledtrig_audio platform_profile rfkill snd soundcore int3403_thermal int340x_thermal_zone soc_button_array acpi_pad int3400_thermal > [ 71.773280] acpi_thermal_rel intel_hid(E) sparse_keymap binfmt_misc zram ip_tables dm_crypt trusted asn1_encoder hid_logitech_hidpp hid_logitech_dj hid_lg_g15 uas usb_storage crct10dif_pclmul crc32_pclmul crc32c_intel i915 ghash_clmulni_intel serio_raw i2c_algo_bit ttm nvme drm_kms_helper nvme_core cec hid_multitouch ucsi_acpi drm typec_ucsi typec wmi i2c_hid_acpi i2c_hid video pinctrl_cannonlake i2c_dev ipmi_devintf ipmi_msghandler fuse > [ 71.773346] CPU: 5 PID: 1712 Comm: modprobe Tainted: G E 5.16.0-rc2+ #632 > [ 71.773349] Hardware name: LENOVO 20U90SIT19/20U90SIT19, BIOS N2WET30W (1.20 ) 08/26/2021 > [ 71.773351] RIP: 0010:reg_process_self_managed_hint+0x198/0x1e0 [cfg80211] > [ 71.773384] Code: 0e f1 02 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 8d 7c 24 68 be ff ff ff ff e8 f0 3f 22 e8 85 c0 0f 85 b8 fe ff ff <0f> 0b e9 b1 fe ff ff 0f 0b 80 3d 9f 7d 0b 00 00 0f 85 94 fe ff ff > [ 71.773387] RSP: 0018:ffff9c284154bc50 EFLAGS: 00010246 > [ 71.773392] RAX: 0000000000000000 RBX: ffff8a9d0884b308 RCX: 0000000000000001 > [ 71.773394] RDX: 0000000000000000 RSI: ffff8a9d08848628 RDI: ffff8a9d07cd8ea0 > [ 71.773398] RBP: ffff9c284154bcc8 R08: 0000000000000000 R09: 0000000000000001 > [ 71.773400] R10: ffffffffaac17c80 R11: 000000000000e000 R12: ffff8a9d088485c0 > [ 71.773402] R13: ffff8a9d0884b308 R14: ffff9c284154bd30 R15: ffff8a9d0884b300 > [ 71.773405] FS: 00007fa9254de740(0000) GS:ffff8aa05a540000(0000) knlGS:0000000000000000 > [ 71.773408] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 71.773411] CR2: 000055fd1b31c350 CR3: 00000001078d2002 CR4: 00000000003706e0 > [ 71.773413] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 71.773416] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 71.773418] Call Trace: > [ 71.773420] <TASK> > [ 71.773422] ? rcu_read_lock_sched_held+0x3f/0x70 > [ 71.773440] regulatory_set_wiphy_regd_sync+0x31/0x90 [cfg80211] > [ 71.773485] iwl_mvm_init_mcc+0xa9/0x1b0 [iwlmvm] > [ 71.773510] iwl_op_mode_mvm_start+0xc32/0xc90 [iwlmvm] > [ 71.773538] _iwl_op_mode_start.isra.0+0x3f/0x80 [iwlwifi] > [ 71.773554] iwl_opmode_register+0x6f/0xe0 [iwlwifi] > [ 71.773566] ? 0xffffffffc0ef1000 > [ 71.773571] iwl_mvm_init+0x36/0x1000 [iwlmvm] > [ 71.773589] do_one_initcall+0x58/0x300 > [ 71.773595] ? rcu_read_lock_sched_held+0x3f/0x70 > [ 71.773599] ? trace_kmalloc+0x2c/0xd0 > [ 71.773603] ? kmem_cache_alloc_trace+0x1e8/0x3a0 > [ 71.773613] do_init_module+0x5c/0x260 > [ 71.773620] __do_sys_init_module+0x130/0x190 > [ 71.773641] do_syscall_64+0x38/0x90 > [ 71.773646] entry_SYSCALL_64_after_hwframe+0x44/0xae > [ 71.773651] RIP: 0033:0x7fa9255f599e > [ 71.773654] 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 > [ 71.773657] RSP: 002b:00007ffd859069e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000af > [ 71.773674] RAX: ffffffffffffffda RBX: 000055796d7dbe40 RCX: 00007fa9255f599e > [ 71.773677] RDX: 000055796d167a2a RSI: 00000000000fcf09 RDI: 000055796e264bf0 > [ 71.773679] RBP: 000055796e264bf0 R08: 000055796d7dbd90 R09: 00000000000fc010 > [ 71.773681] R10: 0000000000000005 R11: 0000000000000246 R12: 000055796d167a2a > [ 71.773683] R13: 000055796d7dbf70 R14: 000055796d7dbe40 R15: 000055796d7df170 > [ 71.773699] </TASK> > [ 71.773700] irq event stamp: 166083 > [ 71.773702] hardirqs last enabled at (166089): [<ffffffffa816e5d0>] __up_console_sem+0x60/0x70 > [ 71.773705] hardirqs last disabled at (166094): [<ffffffffa816e5b5>] __up_console_sem+0x45/0x70 > [ 71.773708] softirqs last enabled at (165934): [<ffffffffa80ec5f0>] __irq_exit_rcu+0xd0/0x100 > [ 71.773711] softirqs last disabled at (165929): [<ffffffffa80ec5f0>] __irq_exit_rcu+0xd0/0x100 > [ 71.773714] ---[ end trace ba8c4bf440db1ae1 ]--- > > Regards, > > Hans >
