rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=b79/1/0x4000000000000000 softirq=44346/44346 fqs=3
(detected by 0, t=10502 jiffies, g=68005, q=256 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6053 Comm: kworker/1:15 Not tainted 5.19.0-syzkaller-01583-g7d0d3fa7339e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events iterate_cleanup_work
RIP: 0010:rcu_lockdep_current_cpu_online+0x5c/0x120 kernel/rcu/tree.c:1185
Code: 08 89 c3 83 f8 08 0f 83 c2 00 00 00 49 be 00 00 00 00 00 fc ff df 48 8d 1c dd 40 98 58 8c 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 fa 96 69 00 48 8b 03 48 8d 98 00 aa 03 00 48 8d
RSP: 0018:ffffc900001e0a40 EFLAGS: 00000046
RAX: 1ffffffff18b1309 RBX: ffffffff8c589848 RCX: 0000000080010002
RDX: 0000000000000000 RSI: ffffffff8ae9a820 RDI: ffffffff8ae9a7e0
RBP: ffffc900001e0ae0 R08: dffffc0000000000 R09: fffffbfff1c07686
R10: fffffbfff1c07686 R11: 1ffffffff1c07685 R12: dffffc0000000000
R13: ffffffff886bb7d4 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000d030 CR3: 000000002820f000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
rcu_read_lock_sched_held+0x74/0x130 kernel/rcu/update.c:123
trace_lock_release+0x7a/0x190 include/trace/events/lock.h:69
lock_release+0x81/0x870 kernel/locking/lockdep.c:5677
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:389 [inline]
advance_sched+0x634/0x8c0 net/sched/sch_taprio.c:764
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20
RIP: 0010:hlist_nulls_empty include/linux/list_nulls.h:88 [inline]
RIP: 0010:get_next_corpse net/netfilter/nf_conntrack_core.c:2379 [inline]
RIP: 0010:nf_ct_iterate_cleanup+0xae/0x520 net/netfilter/nf_conntrack_core.c:2430
Code: 89 ed 25 ff 03 00 00 48 c1 e0 06 48 8d 80 c0 4a 86 8c 48 89 04 24 4c 89 6c 24 18 4a 8d 2c ed 00 00 00 00 48 03 2d fa ff 87 05 <49> 89 ec 49 c1 ec 03 43 80 3c 3c 00 74 08 48 89 ef e8 5c 23 5e f9
RSP: 0018:ffffc9000bb47b18 EFLAGS: 00000286
RAX: ffffffff8c871dc0 RBX: 0000000000000001 RCX: ffff8880468ad880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888026bada60 R08: ffffffff887c5a16 R09: fffffbfff1fa9a12
R10: fffffbfff1fa9a12 R11: 1ffffffff1fa9a11 R12: 1ffff11004d75b4b
R13: 0000000000035b4c R14: ffffc9000bb47ba0 R15: dffffc0000000000
iterate_cleanup_work+0x142/0x260 net/netfilter/nf_nat_masquerade.c:87
process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
rcu: rcu_preempt kthread starved for 10495 jiffies! g68005 f0x0 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:26392 pid: 16 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5146 [inline]
__schedule+0x957/0xe20 kernel/sched/core.c:6458
schedule+0xcb/0x190 kernel/sched/core.c:6534
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1935
rcu_gp_fqs_loop+0x2b9/0xfb0 kernel/rcu/tree.c:1999
rcu_gp_kthread+0xa5/0x360 kernel/rcu/tree.c:2187
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-syzkaller-01583-g7d0d3fa7339e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation+0x1da/0x250 kernel/rcu/tree_stall.h:518
print_other_cpu_stall+0x140a/0x1560 kernel/rcu/tree_stall.h:623
check_cpu_stall kernel/rcu/tree_stall.h:769 [inline]
rcu_pending kernel/rcu/tree.c:3977 [inline]
rcu_sched_clock_irq+0x9c4/0x19d0 kernel/rcu/tree.c:2675
update_process_times+0x148/0x1b0 kernel/time/timer.c:1839
tick_sched_handle kernel/time/tick-sched.c:243 [inline]
tick_sched_timer+0x377/0x540 kernel/time/tick-sched.c:1480
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:112 [inline]
RIP: 0010:acpi_idle_do_entry drivers/acpi/processor_idle.c:554 [inline]
RIP: 0010:acpi_idle_enter+0x43d/0x7a0 drivers/acpi/processor_idle.c:691
Code: ff e8 67 f1 f3 fc 48 83 e3 08 44 8b 7c 24 04 0f 85 10 01 00 00 e8 c3 99 fa fc 66 90 e8 8c ec f3 fc 0f 00 2d 05 cf 61 06 fb f4 <4c> 89 e3 48 c1 eb 03 42 80 3c 2b 00 74 08 4c 89 e7 e8 4d c8 46 fd
RSP: 0018:ffffffff8c807ba0 EFLAGS: 000002d3
RAX: ffffffff8493b574 RBX: 0000000000000000 RCX: ffffffff8c8bb8c0
RDX: 0000000000000000 RSI: ffffffff8a8d3020 RDI: ffffffff8ae9a840
RBP: ffffffff8c807c50 R08: ffffffff8493b559 R09: fffffbfff1917719
R10: fffffbfff1917719 R11: 1ffffffff1917718 R12: ffffffff8c807be0
R13: dffffc0000000000 R14: ffff8880175e9000 R15: 0000000000000001
cpuidle_enter_state+0x517/0xed0 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3d2/0x640 kernel/sched/idle.c:303
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400
rest_init+0x24f/0x270 init/main.c:726
arch_call_rest_init+0xa/0xa init/main.c:882
start_kernel+0x4ac/0x55b init/main.c:1137
secondary_startup_64_no_verify+0xcf/0xdb