rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=60fc/1/0x4000000000000000 softirq=39179/39179 fqs=1 (detected by 1, t=10502 jiffies, g=56409, q=311 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5163 Comm: kworker/0:6 Not tainted 6.1.0-syzkaller-04295-g81852018f240 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_power_efficient gc_worker RIP: 0010:__lock_acquire+0x391/0x56d0 kernel/locking/lockdep.c:5003 Code: ea 03 c1 e0 12 25 00 00 04 00 41 09 c7 8b 84 24 58 01 00 00 45 09 f9 c1 e0 14 41 09 c1 41 8b 44 24 20 25 ff 1f 00 00 41 09 c1 <48> b8 00 00 00 00 00 fc ff df 45 89 4c 24 20 0f b6 14 02 48 89 f8 RSP: 0018:ffffc90000007b48 EFLAGS: 00000002 RAX: 00000000000009dc RBX: ffff888021212778 RCX: 0000000000000000 RDX: 1ffff11004242502 RSI: 0000000000000004 RDI: ffff888021212814 RBP: 0000000000000000 R08: 1ffff110042424fd R09: 00000000000c49dc R10: fffffbfff1ce5b72 R11: 0000000000000000 R12: ffff8880212127f0 R13: ffff888021211d40 R14: ffff888048ec7300 R15: 0000000000044000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0008edfb8 CR3: 00000000279c4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] advance_sched+0x57/0x9b0 net/sched/sch_taprio.c:700 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x690/0xfb0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x320/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] __sysvec_apic_timer_interrupt+0x180/0x640 arch/x86/kernel/apic/apic.c:1113 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:lock_release+0x12/0x810 kernel/locking/lockdep.c:5676 Code: fe ff ff 48 c7 c7 a8 10 73 8e e8 09 64 6b 00 e9 6d fd ff ff 0f 1f 40 00 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 41 57 41 56 <41> 55 41 54 49 89 fc 55 53 48 81 ec 90 00 00 00 48 8d 6c 24 10 48 RSP: 0018:ffffc900040bfc00 EFLAGS: 00000293 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff888021211d40 RSI: ffffffff880eeb50 RDI: ffffffff8c7917c0 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000040000 R15: 0000000000002ba9 rcu_lock_release include/linux/rcupdate.h:330 [inline] rcu_read_unlock include/linux/rcupdate.h:797 [inline] gc_worker+0xaf2/0x18d0 net/netfilter/nf_conntrack_core.c:1569 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 rcu: rcu_preempt kthread timer wakeup didn't happen for 4315 jiffies! g56409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=34470 rcu: rcu_preempt kthread starved for 4316 jiffies! g56409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28656 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0xb8a/0x5450 kernel/sched/core.c:6555 schedule+0xde/0x1b0 kernel/sched/core.c:6631 schedule_timeout+0x14e/0x2a0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1656 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1855 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 16347 Comm: syz-executor.4 Not tainted 6.1.0-syzkaller-04295-g81852018f240 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:csd_lock_wait kernel/smp.c:413 [inline] RIP: 0010:smp_call_function_many_cond+0x43f/0x10a0 kernel/smp.c:987 Code: e6 e8 05 fb 0a 00 45 85 e4 74 48 48 8b 04 24 49 89 c5 83 e0 07 49 c1 ed 03 49 89 c4 4d 01 fd 41 83 c4 03 e8 33 fe 0a 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 4e 0a 00 00 8b 43 08 31 RSP: 0018:ffffc900151c7918 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9843ce0 RCX: 0000000000000000 RDX: ffff888021418000 RSI: ffffffff817653ad RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed101730879d R14: 0000000000000001 R15: dffffc0000000000 FS: 0000555556946400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020044100 CR3: 000000007916d000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x5a/0xa0 kernel/smp.c:1155 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1772 [inline] text_poke_bp_batch+0x3f1/0x6b0 arch/x86/kernel/alternative.c:2016 text_poke_bp+0x79/0xa0 arch/x86/kernel/alternative.c:2167 arch_static_call_transform+0x51/0x90 arch/x86/kernel/static_call.c:119 __static_call_update+0xd3/0x620 kernel/static_call_inline.c:147 tracepoint_update_call kernel/tracepoint.c:317 [inline] tracepoint_remove_func kernel/tracepoint.c:441 [inline] tracepoint_probe_unregister+0x9cf/0xc30 kernel/tracepoint.c:551 bpf_raw_tp_link_release+0x55/0xa0 kernel/bpf/syscall.c:3154 bpf_link_free+0xe6/0x1b0 kernel/bpf/syscall.c:2737 bpf_link_put+0x165/0x1b0 kernel/bpf/syscall.c:2763 bpf_link_release+0x37/0x50 kernel/bpf/syscall.c:2772 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe294e3df5b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffddace3240 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fe294e3df5b RDX: 0000000000000000 RSI: 0000001b3233065c RDI: 0000000000000006 RBP: 00007fe294fad980 R08: 0000000000000000 R09: 00000000da234741 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000008e48e R13: 00007ffddace3340 R14: 00007ffddace3360 R15: 0000000000000032