rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=17b/1/0x4000000000000000 softirq=13075/13078 fqs=5248 
	(t=10502 jiffies g=16801 q=988)
NMI backtrace for cpu 1
CPU: 1 PID: 6131 Comm: syz.1.695 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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+0x9b/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:cake_heap_get_backlog net/sched/sch_cake.c:1472 [inline]
RIP: 0010:cake_heapify+0x184/0x560 net/sched/sch_cake.c:1486
Code: ba 00 00 00 00 00 fc ff df 44 89 f8 c1 e8 03 25 ff 03 00 00 41 83 e7 07 49 69 cf d0 98 01 00 48 03 0b 4c 8d a4 81 00 40 01 00 <4c> 89 e0 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 d5 02 00 00 45 8b 24
RSP: 0018:ffffc900032ce568 EFLAGS: 00000282
RAX: 00000000000002b7 RBX: ffff88801ee802d0 RCX: ffff88805377fc10
RDX: dffffc0000000000 RSI: 0000000000000ade RDI: 0000000000001000
RBP: 0000000000000ade R08: ffffffff901cb1ef R09: 1ffffffff203963d
R10: dffffc0000000000 R11: fffffbfff203963e R12: ffff8880537946ec
R13: 00000000000015bd R14: 0000000000000ade R15: 0000000000000005
 cake_drop net/sched/sch_cake.c:1575 [inline]
 cake_enqueue+0x4497/0x8690 net/sched/sch_cake.c:1949
 qdisc_enqueue include/net/sch_generic.h:842 [inline]
 netem_dequeue+0xd4c/0x1410 net/sched/sch_netem.c:737
 dequeue_skb net/sched/sch_generic.c:295 [inline]
 qdisc_restart net/sched/sch_generic.c:400 [inline]
 __qdisc_run+0x22f/0x14b0 net/sched/sch_generic.c:418
 __dev_xmit_skb net/core/dev.c:3955 [inline]
 __dev_queue_xmit+0xdce/0x2e50 net/core/dev.c:4266
 tipc_l2_send_msg+0x2eb/0x3a0 net/tipc/bearer.c:518
 tipc_bearer_xmit_skb+0x292/0x3c0 net/tipc/bearer.c:577
 tipc_enable_bearer net/tipc/bearer.c:368 [inline]
 __tipc_nl_bearer_enable+0xfaa/0x12b0 net/tipc/bearer.c:1049
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:375 [inline]
 tipc_nl_compat_doit+0x3d9/0x610 net/tipc/netlink_compat.c:397
 tipc_nl_compat_handle net/tipc/netlink_compat.c:-1 [inline]
 tipc_nl_compat_recv+0x536/0xaf0 net/tipc/netlink_compat.c:1325
 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
 genl_rcv_msg+0xd0b/0xfa0 net/netlink/genetlink.c:792
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
 __sys_sendmsg net/socket.c:2529 [inline]
 __do_sys_sendmsg net/socket.c:2538 [inline]
 __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536
 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: 0033:0x7f86fe851e59
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:00007f86fcaab028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f86feacafa0 RCX: 00007f86fe851e59
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000005
RBP: 00007f86fe8e7e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f86feacb038 R14: 00007f86feacafa0 R15: 00007ffd1cc0e308
 </TASK>