rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 ticks this GP) idle=25bc/1/0x4000000000000000 softirq=16632/16647 fqs=0
rcu: 	(t=11586 jiffies g=14241 q=663 ncpus=2)
rcu: rcu_preempt kthread starved for 11586 jiffies! g14241 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:26600 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5351 [inline]
 __schedule+0x1737/0x4d30 kernel/sched/core.c:6954
 __schedule_loop kernel/sched/core.c:7036 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7051
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.16.0-syzkaller-06699-ge8d780dcd957 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5831
Code: 89 44 24 58 0f 1f 44 00 00 65 8b 05 ef af fc 10 83 f8 08 0f 83 b8 01 00 00 89 c0 48 0f a3 05 98 1d 03 0e 73 16 e8 f1 f0 08 00 <84> c0 75 0d f6 05 03 0e ed 0d 01 0f 84 d7 01 00 00 83 3d b9 4e 03
RSP: 0018:ffffc90000007c00 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 78ebd8af1bee6500
RDX: 0000000000000000 RSI: ffffffff8be30a60 RDI: ffffffff8be30a20
RBP: ffffffff81adb4d2 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f411bf R12: 0000000000000000
R13: ffff8880b8627a98 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125c7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005588bd3df5c0 CR3: 0000000078fdc000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1765 [inline]
 __hrtimer_run_queues+0x602/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 53 e8 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 5f 18 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900000f7178 EFLAGS: 000002d3
RAX: ffffffff81722d2d RBX: 0000000000000003 RCX: ffff88801ce91e00
RDX: 0000000000000000 RSI: ffffffff8d979737 RDI: ffffffff8be30a80
RBP: ffffc900000f7250 R08: ffffffff8fa08df7 R09: 1ffffffff1f411be
R10: dffffc0000000000 R11: fffffbfff1f411bf R12: dffffc0000000000
R13: 0000000000000200 R14: 0000000000000003 R15: 1ffff9200001ee34
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 kvm_wait+0x232/0x290 arch/x86/kernel/kvm.c:1064
 pv_wait arch/x86/include/asm/paravirt.h:569 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
 __pv_queued_spin_lock_slowpath+0x7bf/0xb60 kernel/locking/qspinlock.c:325
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
 queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 queued_write_lock_slowpath+0x22c/0x260 kernel/locking/qrwlock.c:73
 queued_write_lock include/asm-generic/qrwlock.h:101 [inline]
 do_raw_write_lock+0x1f2/0x260 kernel/locking/spinlock_debug.c:211
 ___neigh_create+0xe81/0x2260 net/core/neighbour.c:690
 ip6_finish_output2+0xb4d/0x16a0 net/ipv6/ip6_output.c:132
 ip6tunnel_xmit include/net/ip6_tunnel.h:162 [inline]
 udp_tunnel6_xmit_skb+0x640/0xad0 net/ipv6/ip6_udp_tunnel.c:112
 send6+0x5ac/0x8d0 drivers/net/wireguard/socket.c:152
 wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x1c8/0x7c0 drivers/net/wireguard/send.c:276
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
CPU: 1 UID: 0 PID: 24 Comm: kworker/1:0 Not tainted 6.16.0-syzkaller-06699-ge8d780dcd957 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_power_efficient gc_worker
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x18/0x70 kernel/kcov.c:217
Code: cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 20 9a 92 65 8b 15 08 6a da 10 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00
RSP: 0018:ffffc900001e7918 EFLAGS: 00000287
RAX: ffffffff89a315d9 RBX: dffffc0000000000 RCX: ffff88801d688000
RDX: 0000000080000000 RSI: 0000000000040000 RDI: 0000000000005d90
RBP: ffffc900001e7a70 R08: ffffffff8fa08df7 R09: 1ffffffff1f411be
R10: dffffc0000000000 R11: fffffbfff1f411bf R12: ffff8880b87396c0
R13: ffff88801d2b7318 R14: dffffc0000000000 R15: 0000000000040000
FS:  0000000000000000(0000) GS:ffff888125d7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005588bd3a4168 CR3: 000000002e8f4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 gc_worker+0xc49/0x1380 net/netfilter/nf_conntrack_core.c:1629
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>