rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2647 jiffies s: 4089 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 21 Comm: ksoftirqd/1 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+0x18d/0x6a0 net/sched/sch_cake.c:1486
Code: 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 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 e9 03 00 00 <45> 8b 27 44 89 e7 8b 5c 24 0c 89 de e8 22 8a 2f f9 41 39 dc 77 06
RSP: 0018:ffffc900001b6fc0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffff88805214ca70
RDX: dffffc0000000000 RSI: 000000000000024d RDI: 0000000000001000
RBP: 000000000000024d R08: dffffc0000000000 R09: fffffbfff215c473
R10: fffffbfff215c473 R11: 1ffffffff215c472 R12: ffff888075c782d0
R13: 000000000000049b R14: 000000000000024d R15: ffff888052160cbc
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3201eff8 CR3: 000000007285a000 CR4: 00000000003506e0
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]
 tbf_enqueue+0x224/0x6e0 net/sched/sch_tbf.c:257
 dev_qdisc_enqueue+0x4c/0x2b0 net/core/dev.c:3875
 __dev_xmit_skb net/core/dev.c:3964 [inline]
 __dev_queue_xmit+0xf8e/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>