sched: DL replenish lagged too much rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=20165, q=1342 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10366 (4294965066-4294954700), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10366 jiffies! g20165 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:25856 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x18af/0x4bd0 kernel/sched/core.c:6690 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7012 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:__timer_delete_sync+0x4/0x310 kernel/time/timer.c:1638 Code: 47 13 00 48 89 df 31 f6 5b eb 1b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec a0 00 RSP: 0018:ffffc90000167b98 EFLAGS: 00000246 RAX: 0000000000208040 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffc90000167bc0 RBP: ffffc90000167c90 R08: ffffffff901cfeef R09: 1ffffffff2039fdd R10: dffffc0000000000 R11: fffffbfff2039fde R12: dffffc0000000000 R13: 1ffff9200002cf74 R14: ffffc90000167bc0 R15: 00000000ffffcecd timer_delete_sync kernel/time/timer.c:1722 [inline] del_timer_sync include/linux/timer.h:185 [inline] schedule_timeout+0x1c8/0x310 kernel/time/timer.c:2616 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5298 Comm: kworker/1:6 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_power_efficient neigh_periodic_work RIP: 0010:__sanitizer_cov_trace_pc+0x46/0x70 kernel/kcov.c:222 Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 RSP: 0018:ffffc90000a186b8 EFLAGS: 00000046 RAX: ffffffff87375663 RBX: 0000000000000000 RCX: ffff88802cf83c00 RDX: ffffc900022d2000 RSI: 0000000000000014 RDI: 0000000000000014 RBP: ffffc90000a18838 R08: ffffffff873754a6 R09: 1ffff1100f5ab2d1 R10: dffffc0000000000 R11: ffffed100f5ab2d2 R12: dffffc0000000000 R13: 1ffff11028874843 R14: ffff8881443a4000 R15: ffff8881443a4218 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6bd6e656c0 CR3: 000000000e734000 CR4: 0000000000350ef0 Call Trace: map_urb_for_dma drivers/usb/core/hcd.c:1381 [inline] usb_hcd_submit_urb+0x303/0x1e80 drivers/usb/core/hcd.c:1531 ath9k_hif_usb_reg_in_cb+0x4ce/0x6e0 drivers/net/wireless/ath/ath9k/hif_usb.c:790 __usb_hcd_giveback_urb+0x42e/0x6e0 drivers/usb/core/hcd.c:1650 dummy_timer+0x856/0x4620 drivers/usb/gadget/udc/dummy_hcd.c:1993 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x59d/0xd50 kernel/time/hrtimer.c:1755 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1772 handle_softirqs+0x2c7/0x980 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 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:7012 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 35 a1 94 f5 e8 a0 13 ce f5 fb bf 01 00 00 00 e5 ab ff ff 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 05 13 30 f6 48 RSP: 0018:ffffc90003d278e0 EFLAGS: 00000282 RAX: 6a84814cac4e4f00 RBX: 1ffff920007a4f24 RCX: ffffffff8170be0a RDX: dffffc0000000000 RSI: ffffffff8c0acb40 RDI: 0000000000000001 RBP: ffffc90003d279a0 R08: ffffffff942c98c7 R09: 1ffffffff2859318 R10: dffffc0000000000 R11: fffffbfff2859319 R12: 1ffff920007a4f1c R13: 1ffff920007a4f20 R14: ffffc90003d27900 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:should_resched arch/x86/include/asm/preempt.h:103 [inline] RIP: 0010:__local_bh_enable_ip+0x170/0x200 kernel/softirq.c:389 Code: 8c e8 54 08 6f 0a 65 66 8b 05 84 59 ac 7e 66 85 c0 75 5d bf 01 00 00 00 e8 7d af 0b 00 e8 48 20 45 00 fb 65 8b 05 48 59 ac 7e <85> c0 75 05 e8 e7 37 a9 ff 48 c7 44 24 20 0e 36 e0 45 49 c7 04 1c RSP: 0018:ffffc90003d27a60 EFLAGS: 00000286 RAX: 0000000080000000 RBX: 1ffff920007a4f50 RCX: ffffffff8170be0a RDX: dffffc0000000000 RSI: ffffffff8c0acb40 RDI: ffffffff8c6102a0 RBP: ffffc90003d27b20 R08: ffffffff942c98c7 R09: 1ffffffff2859318 R10: dffffc0000000000 R11: fffffbfff2859319 R12: dffffc0000000000 R13: 1ffff920007a4f54 R14: ffffc90003d27aa0 R15: 0000000000000201 neigh_periodic_work+0xb35/0xd50 net/core/neighbour.c:1019 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244