rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=f4f4/0/0x3 softirq=65578/65578 fqs=5217
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7577          0            0
rcu: 	cputime:      167      52312            0   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=54953 q=1672 ncpus=2)
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x2f/0x90 kernel/kcov.c:314
Code: 8b 04 24 65 48 8b 14 25 08 80 a0 92 65 8b 0d 88 cd e0 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 3c 16 00 00 00 <74> 52 8b 8a 18 16 00 00 83 f9 03 75 47 48 8b 8a 20 16 00 00 44 8b
RSP: 0018:ffffc90000a08038 EFLAGS: 00000246
RAX: ffffffff89985d54 RBX: 00000000ea3a6eb0 RCX: 0000000000000100
RDX: ffff88801cebda00 RSI: 00000000ea3a6eb0 RDI: 0000000000000001
RBP: ffffc90000a081d0 R08: ffffffff8fa39737 R09: 1ffffffff1f472e6
R10: dffffc0000000000 R11: ffffffff8167ba50 R12: ffff88804f0a64c0
R13: dffffc0000000000 R14: ffff88804f0a6480 R15: 1ffff1100a560869
FS:  0000000000000000(0000) GS:ffff888125d18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000806000 CR3: 0000000078d6e000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 fq_dequeue+0x864/0x2650 net/sched/sch_fq.c:695
 dequeue_skb net/sched/sch_generic.c:294 [inline]
 qdisc_restart net/sched/sch_generic.c:399 [inline]
 __qdisc_run+0x23c/0x15f0 net/sched/sch_generic.c:417
 __dev_xmit_skb net/core/dev.c:4183 [inline]
 __dev_queue_xmit+0x1056/0x3b50 net/core/dev.c:4691
 dev_queue_xmit include/linux/netdevice.h:3361 [inline]
 neigh_hh_output include/net/neighbour.h:531 [inline]
 neigh_output include/net/neighbour.h:545 [inline]
 ip6_finish_output2+0x11bc/0x16a0 net/ipv6/ip6_output.c:141
 ip6_send_skb+0x1d5/0x390 net/ipv6/ip6_output.c:1984
 icmp6_send+0x12c6/0x1940 net/ipv6/icmp.c:634
 __icmpv6_send include/linux/icmpv6.h:28 [inline]
 icmpv6_send include/linux/icmpv6.h:49 [inline]
 ip6_link_failure+0x3b/0x4c0 net/ipv6/route.c:2843
 dst_link_failure include/net/dst.h:429 [inline]
 ndisc_error_report+0x118/0x160 net/ipv6/ndisc.c:732
 neigh_invalidate+0x232/0x460 net/core/neighbour.c:1082
 neigh_timer_handler+0x949/0x1150 net/core/neighbour.c:1173
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 13 e8 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 73 37 0e 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c2
RAX: 9d2773ba07af9d00 RBX: ffffffff819683f8 RCX: 9d2773ba07af9d00
RDX: 0000000000000001 RSI: ffffffff8d9b8bbd RDI: ffffffff8be33880
RBP: ffffc90000197f20 R08: ffff8880b8732f9b R09: 1ffff110170e65f3
R10: dffffc0000000000 R11: ffffed10170e65f4 R12: ffffffff8fa39730
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff110039d7b40
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:757
 default_idle_call+0x74/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x1e8/0x510 kernel/sched/idle.c:330
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13e/0x147
 </TASK>