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McKenney" , Ingo Molnar From: Venkat Rao Bagalkote Subject: [next20260529]powerpc/pseries: multiple WARNs: RCU not watching for tracepoint and lockdep_hardirq_context() during boot and cpuidle (Power11) Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: L1ErtMxIWt3XZBIN6jephwM-jAhaeJLN X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjAxMDEzMSBTYWx0ZWRfXxckBQSLhcYCS FXcgCRi8XJLOVmY122bxqfkwiJEf1JgLBvyyIVOko16vwrCt3xdta3wMCIyThcECHAYOK7l55xU 3mg683WkCeeMyQeDT4kqmLmeF/7X6stJAQDU/bgJQnQLbuaklLZdO+dF/X2R9BHh6n/+bYCzqut 9vC7hClsyFYP6DPUmO6uG1wK4BLzl9CQpXXGLOdlFqZEnaKEHgX9WXHws0Pep5dep9Ghoi38TPq Oe6Y0uDoPBhAQScVlFXKOxEDOWRMiyolttToEzSIwGg9IinA5qcZkBiKjHqHJePrYzzacBBGQ3H Mc1jFZWGeSk+Ok5VkyM9RqTDwczJ+AcaJ8tFm5pYyTPVIcl29XcPbFH+9NkLkH0dCl0pVBqdEZ9 fRgFDmrMyuTkvHyRpK1cdGhrJX8Pz+6Ro1z20qKmybrnhz6hST3ym92uKxTqlAFzUle2VfVWHJc deruQUDvptySiekhefQ== X-Proofpoint-ORIG-GUID: pR1LsMk44R_6oIP7lM9gQmTqV0tmkS12 X-Authority-Analysis: v=2.4 cv=Vf3H+lp9 c=1 sm=1 tr=0 ts=6a1d88da cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=pC68-rA65GXy0ANEAjIA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-01_03,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 adultscore=0 bulkscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606010131 Greetings!!! I am observing multiple reproducible WARN_ONs related to RCU and lockdep IRQ state tracking on a Power11 pSeries system when running on latest linux-next kernel. Environment:   Architecture: ppc64le (Power11, pSeries LPAR)   Kernel: 7.1.0-rc5-next-20260529   Config: PREEMPT(lazy)           CONFIG_LOCKDEP=y           CONFIG_PROVE_LOCKING=y Warning1: [    0.008277] ------------[ cut here ]------------ [    0.008285] RCU not watching for tracepoint [    0.008294] WARNING: ./include/trace/events/preemptirq.h:36 at trace_hardirqs_off+0x16c/0x1a0, CPU#1: swapper/1/0 [    0.008306] Modules linked in: [    0.008316] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 7.1.0-rc5-next-20260529 #1 PREEMPT(lazy) [    0.008322] Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries [    0.008327] NIP:  c0000000004bb2a8 LR: c0000000004bb2a4 CTR: 0000000000000000 [    0.008331] REGS: c0000000049cb690 TRAP: 0700   Not tainted (7.1.0-rc5-next-20260529) [    0.008336] MSR:  8000000000021033 CR: 44000208  XER: 00000005 [    0.008348] CFAR: c00000000022e9d4 IRQMASK: 3 [    0.008348] GPR00: c0000000004bb2a4 c0000000049cb950 c000000001ccf100 000000000000001f [    0.008348] GPR04: 3fffffffffff7fff c0000000049cb740 c0000000049cb738 0000000000000000 [    0.008348] GPR08: c0000000029d1230 0000000000000001 c0000000049e8000 0000000000000003 [    0.008348] GPR12: c000000002d514e0 c000000effffeb00 0000000000000000 0000000000000000 [    0.008348] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [    0.008348] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [    0.008348] GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [    0.008348] GPR28: 0000000000000000 0000000000000001 c000000002414988 c00000000005be40 [    0.008403] NIP [c0000000004bb2a8] trace_hardirqs_off+0x16c/0x1a0 [    0.008408] LR [c0000000004bb2a4] trace_hardirqs_off+0x168/0x1a0 [    0.008413] Call Trace: [    0.008416] [c0000000049cb950] [c0000000004bb2a4] trace_hardirqs_off+0x168/0x1a0 (unreliable) [    0.008423] [c0000000049cb9d0] [c00000000005be40] arch_interrupt_enter_prepare+0xa0/0x19c [    0.008430] [c0000000049cba00] [c00000000005bf78] doorbell_exception+0x3c/0x4c4 [    0.008436] [c0000000049cbaa0] [c00000000000a2fc] doorbell_super_common_virt+0x28c/0x290 [    0.008443] ---- interrupt: a00 at plpar_hcall_norets_notrace+0x18/0x2c [    0.008449] NIP:  c0000000001b4fc8 LR: c0000000001bcea0 CTR: 0000000000000000 [    0.008453] REGS: c0000000049cbad0 TRAP: 0a00   Not tainted (7.1.0-rc5-next-20260529) [    0.008457] MSR:  8000000000009033   CR: 24000008  XER: 00000000 [    0.008469] CFAR: 0000000000000000 IRQMASK: 0 [    0.008469] GPR00: 0000000000000000 c0000000049cbd90 c000000001ccf100 0000000000000000 [    0.008469] GPR04: 0000000000000000 8004000038407c10 0000000000000000 0000000000000003 [    0.008469] GPR08: 0000000000000001 0000000000000000 0000000000000090 0000000000000001 [    0.008469] GPR12: 8004000038407c00 c000000effffeb00 0000000000000000 000000002ef01820 [    0.008469] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [    0.008469] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000001 [    0.008469] GPR24: 0000000000000001 000000000000dedc c000000003086150 0000000000000001 [    0.008469] GPR28: c0000000049e8000 c000000002241548 c000000002241550 c000000002241548 [    0.008523] NIP [c0000000001b4fc8] plpar_hcall_norets_notrace+0x18/0x2c [    0.008528] LR [c0000000001bcea0] pseries_lpar_idle.part.0+0x74/0x160 [    0.008533] ---- interrupt: a00 [    0.008536] [c0000000049cbd90] [c0000000049cbe30] 0xc0000000049cbe30 (unreliable) [    0.008544] [c0000000049cbe10] [c000000000022c5c] arch_cpu_idle+0x4c/0x120 [    0.008551] [c0000000049cbe30] [c0000000015afe70] default_idle_call+0x154/0x454 [    0.008558] [c0000000049cbec0] [c0000000002d3dfc] cpuidle_idle_call+0x2dc/0x2e0 [    0.008565] [c0000000049cbf10] [c0000000002d3f48] do_idle+0x148/0x1f0 [    0.008571] [c0000000049cbf60] [c0000000002d43c8] cpu_startup_entry+0x4c/0x50 [    0.008578] [c0000000049cbf90] [c00000000006371c] start_secondary+0x27c/0x28c [    0.008585] [c0000000049cbfe0] [c00000000000e258] start_secondary_prolog+0x10/0x14 [    0.008590] Code: 4bfffcc4 60000000 3d220132 8929db46 2c090000 4082ff94 3c62ffd6 3d220132 3863d398 9ba9db46 4bd73655 60000000 <0fe00000> 60000000 4bffff74 60000000 [    0.008611] irq event stamp: 20 [    0.008614] hardirqs last  enabled at (19): [] cpuidle_idle_call+0x2dc/0x2e0 [    0.008620] hardirqs last disabled at (20): [] arch_interrupt_enter_prepare+0xa0/0x19c [    0.008625] softirqs last  enabled at (0): [] copy_process+0xb24/0x1dec [    0.008632] softirqs last disabled at (0): [<0000000000000000>] 0x0 [    0.008637] ---[ end trace 0000000000000000 ]--- Warning2: [    0.010098] ------------[ cut here ]------------ [    0.010103] DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context()) [    0.010107] WARNING: kernel/locking/lockdep.c:4406 at lockdep_hardirqs_on_prepare+0x22c/0x2d4, CPU#0: swapper/0/1 [    0.010116] Modules linked in: [    0.010120] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G     W           7.1.0-rc5-next-20260529 #1 PREEMPT(lazy) [    0.010125] Tainted: [W]=WARN [    0.010127] Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries [    0.010131] NIP:  c00000000031549c LR: c000000000315498 CTR: 0000000000000000 [    0.010135] REGS: c0000000045bf100 TRAP: 0700   Tainted: G   W            (7.1.0-rc5-next-20260529) [    0.010139] MSR:  8000000002021033   CR: 44044228  XER: 00000005 [    0.010147] CFAR: c00000000022e9d4 IRQMASK: 3 [    0.010147] GPR00: c000000000315498 c0000000045bf3c0 c000000001ccf100 000000000000002e [    0.010147] GPR04: 3fffffffffff7fff c0000000045bf1b0 c0000000045bf1a8 0000000000000000 [    0.010147] GPR08: c0000000029d1230 0000000000010002 c0000000048b2b00 0000000000000003 [    0.010147] GPR12: c000000002d514e0 c000000003ea1000 c000000000011ae4 0000000000000000 [    0.010147] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [    0.010147] GPR20: 0000000000000000 0000000000000004 c000000000272684 c0000000029bb0c0 [    0.010147] GPR24: 0000000ebc171000 c000000ebeb63850 c000000003084d00 c00000000308b2d0 [    0.010147] GPR28: c00000000002a488 0000000000000001 0000000000000000 c000000002246e08 [    0.010188] NIP [c00000000031549c] lockdep_hardirqs_on_prepare+0x22c/0x2d4 [    0.010192] LR [c000000000315498] lockdep_hardirqs_on_prepare+0x228/0x2d4 [    0.010196] Call Trace: [    0.010198] [c0000000045bf3c0] [c000000000315498] lockdep_hardirqs_on_prepare+0x228/0x2d4 (unreliable) [    0.010204] [c0000000045bf430] [c0000000004bb778] trace_hardirqs_on+0xec/0x1b0 [    0.010209] [c0000000045bf4b0] [c0000000015ad574] irqentry_exit+0x58c/0xe1c [    0.010213] [c0000000045bf540] [c00000000002a488] timer_interrupt+0x210/0x564 [    0.010219] [c0000000045bf5f0] [c00000000003b960] __replay_soft_interrupts+0x14c/0x374 [    0.010224] [c0000000045bf7d0] [c00000000003bd74] arch_local_irq_restore.part.0+0x1ec/0x224 [    0.010230] [c0000000045bf810] [c0000000015c17d4] _raw_spin_unlock_irqrestore+0x54/0xac [    0.010235] [c0000000045bf840] [c0000000002cdd54] set_user_nice+0x110/0x220 [    0.010240] [c0000000045bf8e0] [c000000000266a94] create_worker+0x13c/0x310 [    0.010245] [c0000000045bf9a0] [c0000000002726f4] workqueue_prepare_cpu+0x70/0xe4 [    0.010251] [c0000000045bf9e0] [c000000000232604] cpuhp_invoke_callback+0x1e8/0x3c0 [    0.010256] [c0000000045bfa50] [c000000000232924] __cpuhp_invoke_callback_range+0x148/0x230 [    0.010261] [c0000000045bfaf0] [c000000000234f68] _cpu_up+0x19c/0x3cc [    0.010265] [c0000000045bfbb0] [c00000000023533c] cpu_up+0x1a4/0x1f4 [    0.010269] [c0000000045bfc40] [c00000000203d1f4] bringup_nonboot_cpus+0xbc/0x128 [    0.010275] [c0000000045bfca0] [c00000000204b98c] smp_init+0x44/0xd0 [    0.010279] [c0000000045bfd00] [c000000002006d4c] kernel_init_freeable+0x23c/0x3b0 [    0.010284] [c0000000045bfdc0] [c000000000011b0c] kernel_init+0x30/0x274 [    0.010288] [c0000000045bfe30] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c [    0.010292] ---- interrupt: 0 at 0x0 [    0.010296] Code: 4182ff74 3d22013c 3929c1d4 81290000 2c090000 4082ff60 3c82ffda 3c62ffd9 3884f998 38634590 4bf19461 60000000 <0fe00000> 4bffff40 60000000 60000000 [    0.010310] irq event stamp: 7440 [    0.010312] hardirqs last  enabled at (7439): [] _raw_spin_unlock_irqrestore+0xa4/0xac [    0.010317] hardirqs last disabled at (7440): [] arch_local_irq_restore.part.0+0xa8/0x224 [    0.010323] softirqs last  enabled at (0): [] copy_process+0xb24/0x1dec [    0.010328] softirqs last disabled at (0): [<0000000000000000>] 0x0 [    0.010331] ---[ end trace 0000000000000000 ]--- Warning3: [    1.718239] ------------[ cut here ]------------ [    1.718247] RCU not watching for tracepoint [    1.718255] WARNING: ./include/trace/events/preemptirq.h:40 at trace_hardirqs_on+0x180/0x1b0, CPU#19: swapper/19/0 [    1.718266] Modules linked in: ibmvscsi ibmveth scsi_transport_srp pseries_wdt [    1.718275] CPU: 19 UID: 0 PID: 0 Comm: swapper/19 Tainted: G       W           7.1.0-rc5-next-20260529 #1 PREEMPT(lazy) [    1.718280] Tainted: [W]=WARN [    1.718283] Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries [    1.718287] NIP:  c0000000004bb80c LR: c0000000004bb808 CTR: 0000000000000000 [    1.718290] REGS: c000000004a4b9e0 TRAP: 0700   Tainted: G   W            (7.1.0-rc5-next-20260529) [    1.718294] MSR:  8000000002823033   CR: 44000208  XER: 00000005 [    1.718305] CFAR: c00000000022e9d4 IRQMASK: 3 [    1.718305] GPR00: c0000000004bb808 c000000004a4bca0 c000000001ccf100 000000000000001f [    1.718305] GPR04: 3fffffffffff7fff c000000004a4ba90 c000000004a4ba88 0000000ebe5e2000 [    1.718305] GPR08: 0000000000000027 0000000000000002 c000000004a62b00 0000000000000003 [    1.718305] GPR12: c000000002d514e0 c000000effff1300 0000000000000000 000000002ef01a60 [    1.718305] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [    1.718305] GPR20: 0000000000000000 0000000000000000 0000000000000000 00000000666a3c88 [    1.718305] GPR24: c00000000105088c 000000000000dedc c000000003084d00 0000000000000000 [    1.718305] GPR28: c000000ec09fe440 0000000000000001 c000000002414988 c00000000003bca8 [    1.718347] NIP [c0000000004bb80c] trace_hardirqs_on+0x180/0x1b0 [    1.718351] LR [c0000000004bb808] trace_hardirqs_on+0x17c/0x1b0 [    1.718355] Call Trace: [    1.718357] [c000000004a4bca0] [c0000000004bb808] trace_hardirqs_on+0x17c/0x1b0 (unreliable) [    1.718362] [c000000004a4bd20] [c00000000003bca8] arch_local_irq_restore.part.0+0x120/0x224 [    1.718369] [c000000004a4bd60] [c0000000015b065c] snooze_loop+0xa0/0x270 [    1.718374] [c000000004a4bda0] [c0000000015af06c] cpuidle_enter_state+0x110/0x8fc [    1.718379] [c000000004a4be60] [c00000000105088c] cpuidle_enter+0x50/0x74 [    1.718384] [c000000004a4bea0] [c0000000002ca85c] call_cpuidle+0x48/0xa0 [    1.718389] [c000000004a4bec0] [c0000000002d3c80] cpuidle_idle_call+0x160/0x2e0 [    1.718395] [c000000004a4bf10] [c0000000002d3f48] do_idle+0x148/0x1f0 [    1.718400] [c000000004a4bf60] [c0000000002d43c8] cpu_startup_entry+0x4c/0x50 [    1.718405] [c000000004a4bf90] [c00000000006371c] start_secondary+0x27c/0x28c [    1.718411] [c000000004a4bfe0] [c00000000000e258] start_secondary_prolog+0x10/0x14 [    1.718415] Code: 60000000 3d220132 8929db48 2c090000 4082ff64 3c62ffd6 39200001 3d420132 3863d398 992adb48 4bd730f1 60000000 <0fe00000> 60000000 4bffff40 60000000 [    1.718430] irq event stamp: 0 [    1.718432] hardirqs last  enabled at (0): [<0000000000000000>] 0x0 [    1.718436] hardirqs last disabled at (0): [] copy_process+0xb24/0x1dec [    1.718442] softirqs last  enabled at (0): [] copy_process+0xb24/0x1dec [    1.718447] softirqs last disabled at (0): [<0000000000000000>] 0x0 [    1.718450] ---[ end trace 0000000000000000 ]--- I am reporting all three warnings in one report, as its flagging inconsistencies around IRQ enable/disable transitions. If you happen to fix this, please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.