rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=1e5/1/0x4000000000000000 softirq=68423/68424 fqs=5249 
	(t=10501 jiffies g=106445 q=416)
NMI backtrace for cpu 0
CPU: 0 PID: 27448 Comm: syz.0.7103 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22d/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31f/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6ec/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:103 [inline]
RIP: 0010:__local_bh_enable_ip+0x13e/0x1c0 kernel/softirq.c:408
Code: 8a e8 16 f1 78 08 65 66 8b 05 ae 61 ba 7e 66 85 c0 75 54 bf 01 00 00 00 e8 df 21 09 00 e8 ca 17 36 00 fb 65 8b 05 5a 38 b9 7e <85> c0 75 05 e8 99 45 b7 ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc90000007940 EFLAGS: 00000286
RAX: 0000000000000300 RBX: 0000000000000201 RCX: 02aefe7b8c55ae00
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a4b40
RBP: ffffc900000079d0 R08: ffffffff910151cf R09: 1ffffffff2202a39
R10: dffffc0000000000 R11: fffffbfff2202a3a R12: ffffffff853b3548
R13: 1ffff1100c00e1b8 R14: dffffc0000000000 R15: 1ffff92000000f28
 spin_unlock_bh include/linux/spinlock.h:409 [inline]
 ptr_ring_produce_bh include/linux/ptr_ring.h:164 [inline]
 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:176 [inline]
 wg_packet_create_data drivers/net/wireguard/send.c:320 [inline]
 wg_packet_send_staged_packets+0xf88/0x16e0 drivers/net/wireguard/send.c:388
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:kernfs_name_compare fs/kernfs/dir.c:326 [inline]
RIP: 0010:kernfs_find_ns+0x370/0x510 fs/kernfs/dir.c:827
Code: 4d 85 f6 0f 84 30 01 00 00 48 8b 5c 24 10 4d 8d 6e 20 4c 89 e8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 ee 00 00 00 41 8b 6d 00 <89> ef 44 89 e6 e8 46 d3 8b ff 44 39 e5 76 0c e8 dc d1 8b ff b8 10
RSP: 0018:ffffc9000353f430 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8b20d600 RCX: 0000000000080000
RDX: ffffc90012468000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 000000000a6b64b4 R08: ffffffff8d24fb2f R09: 1ffffffff1a49f65
R10: dffffc0000000000 R11: fffffbfff1a49f66 R12: 000000000a6b64b4
R13: ffff888035a84ee0 R14: ffff888035a84ec0 R15: dffffc0000000000
 kernfs_remove_by_name_ns+0x37/0x100 fs/kernfs/dir.c:1563
 kernfs_remove_by_name include/linux/kernfs.h:598 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xfd/0x290 fs/sysfs/group.c:289
 sysfs_remove_groups+0x50/0xa0 fs/sysfs/group.c:313
 device_del+0x637/0xa80 drivers/base/core.c:3614
 unregister_netdevice_many+0x1530/0x1a40 net/core/dev.c:11188
 ip_tunnel_delete_nets+0x326/0x370 net/ipv4/ip_tunnel.c:1137
 ops_exit_list net/core/net_namespace.c:177 [inline]
 setup_net+0x842/0xa10 net/core/net_namespace.c:365
 copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:503
 create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
 copy_namespaces+0x378/0x3d0 kernel/nsproxy.c:178
 copy_process+0x17f0/0x3e70 kernel/fork.c:2295
 kernel_clone+0x23f/0x990 kernel/fork.c:2682
 __do_sys_clone kernel/fork.c:2799 [inline]
 __se_sys_clone kernel/fork.c:2783 [inline]
 __x64_sys_clone+0x19a/0x210 kernel/fork.c:2783
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7feeea6ac559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feee8903fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007feeea933fa0 RCX: 00007feeea6ac559
RDX: 0000200000000540 RSI: 0000200000000500 RDI: 0000000040000000
RBP: 00007feeea743ab8 R08: 00002000000005c0 R09: 00002000000005c0
R10: 0000200000000580 R11: 0000000000000206 R12: 0000000000000000
R13: 00007feeea934038 R14: 00007feeea933fa0 R15: 00007ffd224b3288
 </TASK>