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SubjectWARNING: suspicious RCU usage (5.11.0-rc7+ #1812 Tainted: G)
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Hi Peter & Paul,

The traces below are present in the boot dmesg log on my Dell XPS13 9360.

I haven't had the time to look into this in detail yet, but here it goes in
case you know what's going on already.

Cheers!


[ 86.762542] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

[ 86.764298] =============================
[ 86.764300] WARNING: suspicious RCU usage
[ 86.764302] 5.11.0-rc7+ #1812 Tainted: G I
[ 86.764305] -----------------------------
[ 86.764307] /scratch/rafael/work/linux-pm/include/linux/rhashtable.h:594 suspicious rcu_dereference_check() usage!
[ 86.764309]
other info that might help us debug this:

[ 86.764311]
rcu_scheduler_active = 2, debug_locks = 1
[ 86.764313] no locks held by swapper/1/0.
[ 86.764316]
stack backtrace:
[ 86.764318] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G I 5.11.0-rc7+ #1812
[ 86.764321] Hardware name: Dell Inc. XPS 13 9360/, BIOS 1.3.5 05/08/2017
[ 86.764323] Call Trace:
[ 86.764325] <IRQ>
[ 86.764328] dump_stack+0x77/0x97
[ 86.764336] ieee80211_find_sta_by_ifaddr+0x218/0x2e0 [mac80211]
[ 86.764380] ? ath10k_wmi_tlv_op_pull_mgmt_tx_bundle_compl_ev+0xe0/0xe0 [ath10k_core]
[ 86.764399] ath10k_wmi_tlv_parse_peer_stats_info+0x2a/0x70 [ath10k_core]
[ 86.764411] ath10k_wmi_tlv_iter+0x56/0xd0 [ath10k_core]
[ 86.764424] ath10k_wmi_tlv_op_rx+0x75a/0xa30 [ath10k_core]
[ 86.764438] ath10k_htc_rx_completion_handler+0xe8/0x120 [ath10k_core]
[ 86.764452] ? ath10k_htc_process_trailer+0x290/0x290 [ath10k_core]
[ 86.764462] ath10k_pci_process_rx_cb+0x117/0x180 [ath10k_pci]
[ 86.764472] ? ath10k_ce_per_engine_service+0x4c/0x80 [ath10k_core]
[ 86.764490] ? _raw_spin_unlock_irqrestore+0x47/0x60
[ 86.764504] ath10k_ce_per_engine_service+0x5d/0x80 [ath10k_core]
[ 86.764524] ath10k_ce_per_engine_service_any+0x6a/0xa0 [ath10k_core]
[ 86.764543] ath10k_pci_napi_poll+0x44/0x110 [ath10k_pci]
[ 86.764552] net_rx_action+0x15d/0x4e0
[ 86.764570] __do_softirq+0xeb/0x492
[ 86.764583] ? handle_fasteoi_irq+0x150/0x150
[ 86.764591] asm_call_irq_on_stack+0x12/0x20
[ 86.764598] </IRQ>
[ 86.764602] do_softirq_own_stack+0x81/0xa0
[ 86.764609] irq_exit_rcu+0xcd/0xe0
[ 86.764614] common_interrupt+0xfe/0x230
[ 86.764623] asm_common_interrupt+0x1e/0x40
[ 86.764626] RIP: 0010:cpuidle_enter_state+0x109/0x4a0
[ 86.764631] Code: 02 00 00 31 ff e8 b7 40 8e ff 45 84 ff 74 12 9c 58 f6 c4 02 0f 85 10 03 00 00 31 ff e8 70 42 96 ff e8 bb a2 9d ff fb 45 85 f6 <0f> 88 12 01 00 00 49 63 d6 4c 2b 24 24 48 8d 04 52 48 8d 04 82 49
[ 86.764634] RSP: 0018:ffffc900000e3e80 EFLAGS: 00000202
[ 86.764638] RAX: 00000000000e8d89 RBX: 0000000000000002 RCX: 0000000000000000
[ 86.764641] RDX: 0000000000000000 RSI: ffffffff82392561 RDI: ffffffff82344126
[ 86.764643] RBP: ffffe8ffffc93300 R08: 0000000000000001 R09: 0000000000000001
[ 86.764645] R10: ffffc900000e3e60 R11: 0000000000000002 R12: 00000014338d5797
[ 86.764647] R13: ffffffff827e6d60 R14: 0000000000000002 R15: 0000000000000000
[ 86.764667] cpuidle_enter+0x29/0x40
[ 86.764672] do_idle+0x22d/0x2b0
[ 86.764682] cpu_startup_entry+0x19/0x20
[ 86.764686] start_secondary+0x125/0x160
[ 86.764691] secondary_startup_64_no_verify+0xb0/0xbb

[ 86.764710] =============================
[ 86.764712] WARNING: suspicious RCU usage
[ 86.764714] 5.11.0-rc7+ #1812 Tainted: G I
[ 86.764716] -----------------------------
[ 86.764718] /scratch/rafael/work/linux-pm/include/linux/rhashtable.h:369 suspicious rcu_dereference_check() usage!
[ 86.764720]
other info that might help us debug this:

[ 86.764722]
rcu_scheduler_active = 2, debug_locks = 1
[ 86.764724] no locks held by swapper/1/0.
[ 86.764726]
stack backtrace:
[ 86.764728] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G I 5.11.0-rc7+ #1812
[ 86.764730] Hardware name: Dell Inc. XPS 13 9360/, BIOS 1.3.5 05/08/2017
[ 86.764732] Call Trace:
[ 86.764734] <IRQ>
[ 86.764737] dump_stack+0x77/0x97
[ 86.764742] ieee80211_find_sta_by_ifaddr+0x249/0x2e0 [mac80211]
[ 86.764781] ? ath10k_wmi_tlv_op_pull_mgmt_tx_bundle_compl_ev+0xe0/0xe0 [ath10k_core]
[ 86.764795] ath10k_wmi_tlv_parse_peer_stats_info+0x2a/0x70 [ath10k_core]
[ 86.764806] ath10k_wmi_tlv_iter+0x56/0xd0 [ath10k_core]
[ 86.764819] ath10k_wmi_tlv_op_rx+0x75a/0xa30 [ath10k_core]
[ 86.764833] ath10k_htc_rx_completion_handler+0xe8/0x120 [ath10k_core]
[ 86.764845] ? ath10k_htc_process_trailer+0x290/0x290 [ath10k_core]
[ 86.764856] ath10k_pci_process_rx_cb+0x117/0x180 [ath10k_pci]
[ 86.764865] ? ath10k_ce_per_engine_service+0x4c/0x80 [ath10k_core]
[ 86.764876] ? _raw_spin_unlock_irqrestore+0x47/0x60
[ 86.764885] ath10k_ce_per_engine_service+0x5d/0x80 [ath10k_core]
[ 86.764897] ath10k_ce_per_engine_service_any+0x6a/0xa0 [ath10k_core]
[ 86.764908] ath10k_pci_napi_poll+0x44/0x110 [ath10k_pci]
[ 86.764915] net_rx_action+0x15d/0x4e0
[ 86.764927] __do_softirq+0xeb/0x492
[ 86.764934] ? handle_fasteoi_irq+0x150/0x150
[ 86.764940] asm_call_irq_on_stack+0x12/0x20
[ 86.764944] </IRQ>
[ 86.764946] do_softirq_own_stack+0x81/0xa0
[ 86.764951] irq_exit_rcu+0xcd/0xe0
[ 86.764954] common_interrupt+0xfe/0x230
[ 86.764961] asm_common_interrupt+0x1e/0x40
[ 86.764964] RIP: 0010:cpuidle_enter_state+0x109/0x4a0
[ 86.764967] Code: 02 00 00 31 ff e8 b7 40 8e ff 45 84 ff 74 12 9c 58 f6 c4 02 0f 85 10 03 00 00 31 ff e8 70 42 96 ff e8 bb a2 9d ff fb 45 85 f6 <0f> 88 12 01 00 00 49 63 d6 4c 2b 24 24 48 8d 04 52 48 8d 04 82 49
[ 86.764970] RSP: 0018:ffffc900000e3e80 EFLAGS: 00000202
[ 86.764974] RAX: 00000000000e8d89 RBX: 0000000000000002 RCX: 0000000000000000
[ 86.764976] RDX: 0000000000000000 RSI: ffffffff82392561 RDI: ffffffff82344126
[ 86.764978] RBP: ffffe8ffffc93300 R08: 0000000000000001 R09: 0000000000000001
[ 86.764980] R10: ffffc900000e3e60 R11: 0000000000000002 R12: 00000014338d5797
[ 86.764983] R13: ffffffff827e6d60 R14: 0000000000000002 R15: 0000000000000000
[ 86.765002] cpuidle_enter+0x29/0x40
[ 86.765007] do_idle+0x22d/0x2b0
[ 86.765019] cpu_startup_entry+0x19/0x20
[ 86.765025] start_secondary+0x125/0x160
[ 86.765031] secondary_startup_64_no_verify+0xb0/0xbb
[ 88.867292] pcieport 0000:00:1c.4: AER: Corrected error received: 0000:00:1c.4
[ 88.867348] pcieport 0000:00:1c.4: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Transmitter ID)
[ 88.867351] pcieport 0000:00:1c.4: device [8086:9d14] error status/mask=00001000/00002000
[ 88.867354] pcieport 0000:00:1c.4: [12] Timeout
[ 95.481009] pcieport 0000:00:1c.4: AER: Corrected error received: 0000:00:1c.4
[ 95.481024] pcieport 0000:00:1c.4: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Transmitter ID)
[ 95.481028] pcieport 0000:00:1c.4: device [8086:9d14] error status/mask=00001000/00002000
[ 95.481031] pcieport 0000:00:1c.4: [12] Timeout



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