rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6278/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=44209, q=1333 ncpus=1)
task:kworker/u8:10   state:R  running task     stack:0     pid:6278  tgid:6278  ppid:2      task_flags:0x4208060 flags:0x00000010
Workqueue: events_power_efficient gc_worker
Call trace:
 __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x135c/0x2b00 kernel/sched/core.c:7284
 preempt_schedule_irq+0x74/0x174 kernel/sched/core.c:7606
 raw_irqentry_exit_cond_resched+0x30/0x40 kernel/entry/common.c:145
 irqentry_exit_to_kernel_mode_preempt+0x44/0x54 include/linux/irq-entry-common.h:468
 arm64_exit_to_kernel_mode_preempt+0x1c/0x38 arch/arm64/kernel/entry-common.c:107
 __el1_irq arch/arm64/kernel/entry-common.c:571 [inline]
 el1_interrupt+0x4c/0x60 arch/arm64/kernel/entry-common.c:581
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:586
 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:602
 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P)
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P)
 seqcount_lockdep_reader_access+0xe4/0x104 include/linux/seqlock.h:75 (P)
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:348 [inline]
 gc_worker+0x2a8/0x144c net/netfilter/nf_conntrack_core.c:1534
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854
rcu: rcu_preempt kthread starved for 339 jiffies! g44209 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:0     pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00000010
Call trace:
 __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x135c/0x2b00 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x13c/0x20c kernel/sched/core.c:7376
 schedule_timeout+0x13c/0x28c kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x260/0xde8 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x148/0x230 kernel/rcu/tree.c:2330
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 8087 Comm: kworker/u8:22 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
Workqueue: events_unbound nsim_dev_trap_report_work
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221
lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline]
lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221
sp : ffff80008f7e6ff0
x29: ffff80008f7e6ff0 x28: 0000000000000000 x27: 0000000000000000
x26: ffff00006e5382c0 x25: ffff80008f5b1e30 x24: 0000000000000001
x23: ffff00006e538000 x22: 0000000000000001 x21: 0000000000000000
x20: ffff80008f5b1e38 x19: 0000000000000000 x18: ffff80011b876000
x17: ffff0001a4fd3e07 x16: 00000000003c264a x15: 00000000003c264c
x14: 00000000003d141d x13: 0000000000000001 x12: 0000000000000000
x11: ffff80008b24ae28 x10: 0000000000000003 x9 : 0000000000000001
x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000801557e8
x2 : 0000000000000002 x1 : ffff0000c1cf8000 x0 : ffff80011b876000
Call trace:
 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P)
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P)
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] (P)
 _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 (P)
 __debug_check_no_obj_freed lib/debugobjects.c:1180 [inline]
 debug_check_no_obj_freed+0x2c8/0x3a4 lib/debugobjects.c:1201
 slab_free_hook mm/slub.c:2679 [inline]
 slab_free mm/slub.c:6509 [inline]
 kfree+0x124/0x658 mm/slub.c:6802
 skb_kfree_head net/core/skbuff.c:1083 [inline]
 skb_free_head+0x70/0x120 net/core/skbuff.c:1095
 skb_release_data+0x6d0/0x890 net/core/skbuff.c:1122
 skb_release_all+0x60/0x7c net/core/skbuff.c:1197
 __kfree_skb net/core/skbuff.c:1211 [inline]
 consume_skb+0x80/0xf4 net/core/skbuff.c:1448
 nft_synproxy_eval_v4+0x174/0x278 net/netfilter/nft_synproxy.c:-1
 nft_synproxy_do_eval+0x2e8/0x4dc net/netfilter/nft_synproxy.c:142
 nft_synproxy_obj_eval+0x34/0x48 net/netfilter/nft_synproxy.c:334
 nft_objref_eval+0x90/0xa8 net/netfilter/nft_objref.c:22
 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
 nft_do_chain+0x418/0x13c8 net/netfilter/nf_tables_core.c:285
 nft_do_chain_ipv4+0x144/0x240 net/netfilter/nft_chain_filter.c:24
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_slow+0xc8/0x224 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:280 [inline]
 NF_HOOK+0x1f0/0x398 include/linux/netfilter.h:323
 ip_local_deliver+0x128/0x188 net/ipv4/ip_input.c:262
 dst_input include/net/dst.h:481 [inline]
 ip_rcv_finish+0x20c/0x230 net/ipv4/ip_input.c:492
 NF_HOOK+0x308/0x398 include/linux/netfilter.h:325
 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:612
 __netif_receive_skb_one_core+0xc8/0x110 net/core/dev.c:6297
 __netif_receive_skb+0x34/0x128 net/core/dev.c:6410
 process_backlog+0x588/0x14e0 net/core/dev.c:6761
 __napi_poll+0xb4/0x328 net/core/dev.c:7830
 napi_poll net/core/dev.c:7893 [inline]
 net_rx_action+0x5b0/0xc14 net/core/dev.c:8050
 handle_softirqs+0x324/0xcbc kernel/softirq.c:645
 __do_softirq+0x14/0x20 kernel/softirq.c:679
 ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:78
 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:901
 do_softirq_own_stack+0x1c/0x28 arch/arm64/kernel/irq.c:83
 do_softirq+0x90/0xf8 kernel/softirq.c:546
 __local_bh_enable_ip+0x190/0x234 kernel/softirq.c:473
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 __alloc_skb+0x1c8/0x610 net/core/skbuff.c:699
 alloc_skb include/linux/skbuff.h:1384 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline]
 nsim_dev_trap_report_work+0x204/0x9cc drivers/net/netdevsim/dev.c:847
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854