0: reclassify loop, rule prio 0, protocol 800 rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=52161, q=259 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 2365 (4295019092-4295016727), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 2365 jiffies! g52161 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:26104 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0x190e/0x4c90 kernel/sched/core.c:6764 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7086 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lockdep_init_map_type+0xa4/0x910 kernel/locking/lockdep.c:4951 Code: f2 f2 48 89 04 19 66 c7 44 19 09 f3 f3 48 89 4c 24 10 c6 44 19 0b f3 48 83 c7 08 ba 10 00 00 00 31 f6 e8 ef 6a 8b 00 48 89 da <48> c7 c0 80 09 40 9a 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 dd 05 00 RSP: 0018:ffffc900001679e0 EFLAGS: 00000202 RAX: ffffc90000167b50 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffc90000167b60 RBP: ffffc90000167aa8 R08: ffffc90000167b5f R09: ffffc90000167b50 R10: dffffc0000000000 R11: fffff5200002cf6c R12: ffffc90000167b48 R13: 0000000000000000 R14: ffffffff8c0cd800 R15: ffffffff9a4449a0 lockdep_init_map_waits include/linux/lockdep.h:135 [inline] lockdep_init_map_wait include/linux/lockdep.h:142 [inline] lockdep_init_map include/linux/lockdep.h:148 [inline] do_init_timer kernel/time/timer.c:903 [inline] init_timer_on_stack_key+0xde/0x110 kernel/time/timer.c:859 schedule_timeout+0x131/0x290 kernel/time/sleep_timeout.c:96 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 12415 Comm: kworker/u9:0 Not tainted 6.14.0-rc1-syzkaller-00034-g92514ef226f5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: hci9 hci_cmd_sync_work RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 fe 78 2d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 c3 0f 95 f5 65 8b 05 d4 58 0b 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc900000078c0 EFLAGS: 00000206 RAX: b116e34e17c36100 RBX: 1ffff92000000f1c RCX: ffffffff819b316a RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: 0000000000000001 RBP: ffffc90000007950 R08: ffffffff942f9927 R09: 1ffffffff285f324 R10: dffffc0000000000 R11: fffffbfff285f325 R12: dffffc0000000000 R13: 1ffff92000000f18 R14: ffffc900000078e0 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3041bff8 CR3: 000000005bc5a000 CR4: 0000000000350ef0 Call Trace: dummy_timer+0x44d6/0x4620 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x59d/0xd30 kernel/time/hrtimer.c:1865 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1882 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0xf6/0x1c0 kernel/sched/core.c:7086 Code: 89 f5 49 c1 ed 03 eb 0d 48 f7 03 08 00 00 00 0f 84 8b 00 00 00 bf 01 00 00 00 e8 05 b0 96 f5 e8 e0 46 d0 f5 fb bf 01 00 00 00 25 ab ff ff 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 95 1b 2f f6 48 RSP: 0018:ffffc900034a7400 EFLAGS: 00000286 RAX: b116e34e17c36100 RBX: 1ffff92000694e88 RCX: ffffffff819b316a RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: 0000000000000001 RBP: ffffc900034a74c0 R08: ffffffff942f9927 R09: 1ffffffff285f324 R10: dffffc0000000000 R11: fffffbfff285f325 R12: 1ffff92000694e80 R13: 1ffff92000694e84 R14: ffffc900034a7420 R15: dffffc0000000000 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:queue_work_on+0x269/0x380 kernel/workqueue.c:2395 Code: 75 19 e8 ea f2 37 00 eb 18 e8 e3 f2 37 00 e8 3e 4e 6e 0a 48 83 7c 24 10 00 74 e7 e8 d1 f2 37 00 fb 48 c7 44 24 20 0e 36 e0 45 <4b> c7 04 37 00 00 00 00 43 c7 44 37 09 00 00 00 00 66 43 c7 44 37 RSP: 0018:ffffc900034a7580 EFLAGS: 00000293 RAX: ffffffff81876b4f RBX: 0000000000000000 RCX: ffff88805a141e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900034a7670 R08: ffffffff81876b1f R09: 1ffffffff285f324 R10: dffffc0000000000 R11: fffffbfff285f325 R12: 0000000002400001 R13: 0000000000000046 R14: 1ffff92000694eb4 R15: dffffc0000000000 queue_work include/linux/workqueue.h:662 [inline] hci_req_sync_run net/bluetooth/hci_sync.c:143 [inline] __hci_cmd_sync_sk+0x67f/0xf70 net/bluetooth/hci_sync.c:172 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:263 [inline] hci_disconnect_sync+0x210/0x3d0 net/bluetooth/hci_sync.c:5420 hci_abort_conn_sync+0x14a/0x11f0 hci_cmd_sync_work+0x22d/0x400 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244