rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (2 ticks this GP) idle=6fdc/1/0x4000000000000000 softirq=205925/205925 fqs=0 (detected by 1, t=10504 jiffies, g=284585, q=144 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16178 Comm: kworker/0:0 Not tainted 6.0.0-rc2-syzkaller-00495-g53a406803ca5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Workqueue: events_power_efficient gc_worker RIP: 0010:debug_spin_lock_after kernel/locking/spinlock_debug.c:93 [inline] RIP: 0010:do_raw_spin_lock+0x160/0x2a0 kernel/locking/spinlock_debug.c:117 Code: 00 00 65 44 8b 35 f8 23 a2 7e 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 <7c> 08 84 d2 0f 85 d8 00 00 00 4c 89 ea 44 89 75 08 48 b8 00 00 00 RSP: 0018:ffffc90000007d38 EFLAGS: 00000006 RAX: 0000000000000003 RBX: 1ffff92000000fa8 RCX: ffffffff815ff5c0 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc90000007d60 RBP: ffff8880a3f2c2e8 R08: 0000000000000001 R09: 0000000000000003 R10: fffff52000000fac R11: 0000000000000000 R12: ffff8880a3f2c2f0 R13: ffff8880a3f2c2f8 R14: 0000000000000000 R15: ffffffff878c1880 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005569a5cdfd78 CR3: 000000000bc8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: spin_lock include/linux/spinlock.h:349 [inline] advance_sched+0x53/0x9a0 net/sched/sch_taprio.c:716 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x5fa/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200 Code: 48 89 ef 5d e9 c1 c9 4b 00 5d be 03 00 00 00 e9 26 57 81 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 59 66 86 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc9001672fc20 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000 RDX: ffff888158be0000 RSI: ffffffff879bfa5a RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000200 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000040000 R15: 0000000000040000 __seqprop_spinlock_sequence include/linux/seqlock.h:275 [inline] nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:337 [inline] gc_worker+0x2c0/0x1780 net/netfilter/nf_conntrack_core.c:1493 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: rcu_preempt kthread timer wakeup didn't happen for 10503 jiffies! g284585 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=148094 rcu: rcu_preempt kthread starved for 10504 jiffies! g284585 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28728 pid: 16 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 schedule+0xda/0x1b0 kernel/sched/core.c:6570 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1657 rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1854 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16178 Comm: kworker/0:0 Not tainted 6.0.0-rc2-syzkaller-00495-g53a406803ca5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Workqueue: events_power_efficient gc_worker RIP: 0010:hlock_class kernel/locking/lockdep.c:222 [inline] RIP: 0010:mark_lock.part.0+0xb2/0x1910 kernel/locking/lockdep.c:4610 Code: c0 41 83 fd 08 0f 84 f9 00 00 00 bd 01 00 00 00 44 89 e9 d3 e5 48 63 ed 4d 8d 7c 24 20 48 b8 00 00 00 00 00 fc ff df 4c 89 fa <48> c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 6e 08 00 00 41 0f RSP: 0018:ffffc90000007978 EFLAGS: 00000093 RAX: dffffc0000000000 RBX: 1ffff92000000f36 RCX: 0000000000000000 RDX: ffff888158be0b38 RSI: ffff888158be0b18 RDI: ffff888158be0000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff908e094f R10: fffffbfff211c129 R11: 0000000000000000 R12: ffff888158be0b18 R13: 0000000000000000 R14: ffff888158be0a78 R15: ffff888158be0b38 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005569a5cdfd78 CR3: 000000000bc8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_lock kernel/locking/lockdep.c:4596 [inline] mark_usage kernel/locking/lockdep.c:4524 [inline] __lock_acquire+0x14a2/0x56d0 kernel/locking/lockdep.c:5007 lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 debug_object_deactivate lib/debugobjects.c:732 [inline] debug_object_deactivate+0x101/0x300 lib/debugobjects.c:720 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate kernel/time/hrtimer.c:481 [inline] __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x3f3/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200 Code: 48 89 ef 5d e9 c1 c9 4b 00 5d be 03 00 00 00 e9 26 57 81 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 59 66 86 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc9001672fc20 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000 RDX: ffff888158be0000 RSI: ffffffff879bfa5a RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000200 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000040000 R15: 0000000000040000 __seqprop_spinlock_sequence include/linux/seqlock.h:275 [inline] nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:337 [inline] gc_worker+0x2c0/0x1780 net/netfilter/nf_conntrack_core.c:1493 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306