rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=736/1/0x4000000000000002 softirq=221023/221024 fqs=5246 
	(t=10502 jiffies g=278825 q=4470)
NMI backtrace for cpu 0
CPU: 0 PID: 27249 Comm: syz-executor.5 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:549 [inline]
 rcu_pending kernel/rcu/tree.c:3030 [inline]
 rcu_sched_clock_irq.cold+0x51a/0xc37 kernel/rcu/tree.c:2276
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:cbq_dequeue_prio net/sched/sch_cbq.c:700 [inline]
RIP: 0010:cbq_dequeue_1 net/sched/sch_cbq.c:792 [inline]
RIP: 0010:cbq_dequeue+0xc41/0x22a0 net/sched/sch_cbq.c:816
Code: 45 b8 c7 45 9c 00 00 00 00 48 89 45 d0 e9 ab 01 00 00 e8 62 f3 1d fb 49 8d 9f c8 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <0f> 85 83 10 00 00 4d 8b a7 c8 00 00 00 31 ff 4c 89 e6 e8 d8 f4 1d
RSP: 0018:ffffc900074b7730 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1100bfea47d RBX: ffff88805ff523e8 RCX: ffffc90013f8d000
RDX: 0000000000040000 RSI: ffffffff865741de RDI: 0000000000000005
RBP: ffffc900074b7800 R08: ffff888098bac540 R09: fffffbfff16a137d
R10: fffffbfff16a137c R11: ffffffff8b509be7 R12: ffff88805ff52338
R13: ffff88805ff52320 R14: dffffc0000000000 R15: ffff88805ff52320
 dequeue_skb net/sched/sch_generic.c:263 [inline]
 qdisc_restart net/sched/sch_generic.c:366 [inline]
 __qdisc_run+0x1a5/0x1770 net/sched/sch_generic.c:384
 __dev_xmit_skb net/core/dev.c:3727 [inline]
 __dev_queue_xmit+0x163f/0x35c0 net/core/dev.c:4032
 dev_queue_xmit+0x18/0x20 net/core/dev.c:4096
 packet_snd net/packet/af_packet.c:2967 [inline]
 packet_sendmsg+0x25f7/0x6210 net/packet/af_packet.c:2992
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:672
 __sys_sendto+0x262/0x380 net/socket.c:1998
 __do_sys_sendto net/socket.c:2010 [inline]
 __se_sys_sendto net/socket.c:2006 [inline]
 __ia32_sys_sendto+0xdf/0x1a0 net/socket.c:2006
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7efde39
Code: 1d 00 00 00 89 d3 5b 5e 5d c3 8b 04 24 c3 8b 1c 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5cf80cc EFLAGS: 00000296 ORIG_RAX: 0000000000000171
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000280
RDX: 0000000000000054 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000