rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2671 jiffies s: 2653 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:cake_heap_get_backlog net/sched/sch_cake.c:1472 [inline]
RIP: 0010:cake_heapify+0x167/0x6a0 net/sched/sch_cake.c:1486
Code: 48 8b 44 24 10 80 3c 10 00 74 12 4c 89 e7 e8 70 a5 7f f9 48 ba 00 00 00 00 00 fc ff df 89 d8 c1 e8 03 25 ff 03 00 00 83 e3 07 <48> 69 cb d0 98 01 00 49 03 0c 24 4c 8d bc 81 00 40 01 00 4c 89 f8
RSP: 0018:ffffc90000146e00 EFLAGS: 00000206
RAX: 000000000000017c RBX: 0000000000000003 RCX: 0000000000000100
RDX: dffffc0000000000 RSI: 00000000000005f1 RDI: 0000000000001000
RBP: 00000000000005f1 R08: dffffc0000000000 R09: fffffbfff215c472
R10: fffffbfff215c472 R11: 1ffffffff215c471 R12: ffff8880544102d0
R13: 0000000000000be3 R14: 00000000000005f1 R15: ffff888054411a9e
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e9ecf56c0 CR3: 0000000074406000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 cake_drop net/sched/sch_cake.c:1575 [inline]
 cake_enqueue+0x3195/0x7bc0 net/sched/sch_cake.c:1948
 qdisc_enqueue include/net/sch_generic.h:816 [inline]
 netem_dequeue+0xcfc/0x13c0 net/sched/sch_netem.c:737
 dequeue_skb net/sched/sch_generic.c:292 [inline]
 qdisc_restart net/sched/sch_generic.c:397 [inline]
 __qdisc_run+0x247/0x15f0 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3970 [inline]
 __dev_queue_xmit+0x107e/0x3760 net/core/dev.c:4312
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 tipc_l2_send_msg+0x30f/0x3d0 net/tipc/bearer.c:518
 tipc_bearer_xmit_skb+0x2a9/0x3f0 net/tipc/bearer.c:577
 tipc_disc_timeout+0x568/0x6b0 net/tipc/discover.c:338
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 run_ksoftirqd+0x98/0xf0 kernel/softirq.c:963
 smpboot_thread_fn+0x64a/0xa40 kernel/smpboot.c:164
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>