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