rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=3bec/1/0x4000000000000000 softirq=28437/28452 fqs=3307
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        2          0            0
rcu: 	cputime:      157      52342           14   ==> 52530(ms)
rcu: 	(t=10504 jiffies g=24477 q=1508 ncpus=2)
CPU: 1 UID: 0 PID: 5832 Comm: syz-executor Not tainted 6.14.0-rc7-syzkaller-00050-gfc444ada1310 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:cake_get_flow_quantum+0x35/0x290 net/sched/sch_cake.c:675
Code: d5 49 89 f6 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 0f 04 c0 f7 89 eb 83 e3 05 bf 05 00 00 00 89 de e8 3e 08 c0 f7 83 fb 05 <75> 72 49 8d 5e 48 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85
RSP: 0018:ffffc90000a27ee8 EFLAGS: 00000246
RAX: 0000000000000100 RBX: 0000000000000005 RCX: ffff88802ea7da00
RDX: ffff88802ea7da00 RSI: 0000000000000005 RDI: 0000000000000005
RBP: 0000000000000007 R08: ffffffff8a01dbd2 R09: 1ffffffff28a9941
R10: dffffc0000000000 R11: fffffbfff28a9942 R12: dffffc0000000000
R13: ffff888060200000 R14: ffff888060211df0 R15: ffff888060200000
FS:  0000555569b9c500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555769dd5c8 CR3: 000000006391e000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 cake_dequeue+0x2b04/0x4be0 net/sched/sch_cake.c:2106
 dequeue_skb net/sched/sch_generic.c:293 [inline]
 qdisc_restart net/sched/sch_generic.c:398 [inline]
 __qdisc_run+0x274/0x2180 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:4111 [inline]
 __dev_queue_xmit+0x10dd/0x3f50 net/core/dev.c:4618
 dev_queue_xmit include/linux/netdevice.h:3313 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip6_finish_output2+0x127d/0x17c0 net/ipv6/ip6_output.c:141
 ip6_finish_output+0x41e/0x840 net/ipv6/ip6_output.c:226
 ip6_send_skb+0x1b1/0x3b0 net/ipv6/ip6_output.c:1980
 icmp6_send+0x163b/0x2190 net/ipv6/icmp.c:632
 __icmpv6_send include/linux/icmpv6.h:28 [inline]
 icmpv6_send include/linux/icmpv6.h:49 [inline]
 ip6_link_failure+0x3c/0x4f0 net/ipv6/route.c:2799
 dst_link_failure include/net/dst.h:429 [inline]
 ndisc_error_report+0x116/0x160 net/ipv6/ndisc.c:733
 neigh_invalidate+0x249/0x470 net/core/neighbour.c:1010
 neigh_timer_handler+0x8a5/0xfe0 net/core/neighbour.c:1097
 call_timer_fn+0x189/0x650 kernel/time/timer.c:1789
 expire_timers kernel/time/timer.c:1840 [inline]
 __run_timers kernel/time/timer.c:2414 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2426
 run_timer_base kernel/time/timer.c:2435 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 1e 92 1d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 53 fc 83 f5 65 8b 05 a4 4f f8 73 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90002e27b80 EFLAGS: 00000206
RAX: a4d6ea8cd7d74900 RBX: 1ffff920005c4f74 RCX: ffffffff9a653903
RDX: dffffc0000000000 RSI: ffffffff8c2ab3a0 RDI: 0000000000000001
RBP: ffffc90002e27c10 R08: ffffffff903cfe77 R09: 1ffffffff2079fce
R10: dffffc0000000000 R11: fffffbfff2079fcf R12: dffffc0000000000
R13: 1ffff920005c4f70 R14: ffffc90002e27ba0 R15: 0000000000000246
 debug_object_free+0x39e/0x460 lib/debugobjects.c:975
 destroy_hrtimer_on_stack kernel/time/hrtimer.c:465 [inline]
 hrtimer_nanosleep+0x350/0x410 kernel/time/hrtimer.c:2203
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline]
 __se_sys_clock_nanosleep+0x32d/0x3c0 kernel/time/posix-timers.c:1379
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5c71fbfa25
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffd2dc7c4b0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000166 RCX: 00007f5c71fbfa25
RDX: 00007ffd2dc7c4f0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd2dc7c55c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000030961 R15: 00007ffd2dc7c5b0
 </TASK>
sched: DL replenish lagged too much