INFO: rcu_preempt self-detected stall on CPU
	1-...: (10499 ticks this GP) idle=e42/140000000000002/0 softirq=86998/86999 fqs=0 
	 (t=10500 jiffies g=24065 c=24064 q=73)
rcu_preempt kthread starved for 10500 jiffies! g24065 c24064 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_preempt     R  running task    29904     8      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_timeout+0x4df/0xe50 kernel/time/timer.c:1746
 rcu_gp_kthread+0xb3d/0x1ce0 kernel/rcu/tree.c:2255
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 1
CPU: 1 PID: 3520 Comm: syz-executor.3 Not tainted 4.14.184-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:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
 rcu_dump_cpu_stacks+0x16d/0x1b8 kernel/rcu/tree.c:1396
 print_cpu_stall kernel/rcu/tree.c:1542 [inline]
 check_cpu_stall kernel/rcu/tree.c:1610 [inline]
 __rcu_pending kernel/rcu/tree.c:3390 [inline]
 rcu_pending kernel/rcu/tree.c:3452 [inline]
 rcu_check_callbacks.cold+0x490/0xdaa kernel/rcu/tree.c:2792
 update_process_times+0x29/0x60 kernel/time/timer.c:1590
 tick_sched_handle.isra.0+0x73/0x150 kernel/time/tick-sched.c:165
 tick_sched_timer+0x41/0x120 kernel/time/tick-sched.c:1223
 __run_hrtimer kernel/time/hrtimer.c:1223 [inline]
 __hrtimer_run_queues+0x24b/0xb90 kernel/time/hrtimer.c:1287
 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
 smp_apic_timer_interrupt+0x117/0x5f0 arch/x86/kernel/apic/apic.c:1100
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
RIP: 0010:csum_ipv6_magic+0x2/0x70 arch/x86/lib/csum-wrappers_64.c:140
RSP: 0018:ffff8880aed07ad8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff888097619400 RCX: 0000000000000006
RDX: 0000000000000014 RSI: ffff8880921011f8 RDI: ffff888092101ba8
RBP: ffff8880921011f8 R08: 0000000000000000 R09: 000000007c8dd9dc
R10: ffffed1015da0f7f R11: ffff8880aed07bff R12: ffff888091038eec
R13: ffff888092101ba8 R14: ffff8880976194c2 R15: 0000000000000000
 tcp_v6_check include/net/ip6_checksum.h:63 [inline]
 __tcp_v6_send_check include/net/ip6_checksum.h:73 [inline]
 tcp_v6_send_check+0x272/0x400 include/net/ip6_checksum.h:88
 __tcp_transmit_skb+0x10e9/0x2dc0 net/ipv4/tcp_output.c:1104
 tcp_transmit_skb net/ipv4/tcp_output.c:1147 [inline]
 tcp_xmit_probe_skb+0x2d9/0x380 net/ipv4/tcp_output.c:3679
 tcp_write_wakeup+0x178/0x570 net/ipv4/tcp_output.c:3731
 tcp_send_probe0+0x46/0x3c3 net/ipv4/tcp_output.c:3746
 tcp_probe_timer net/ipv4/tcp_timer.c:365 [inline]
 tcp_write_timer_handler+0x687/0x780 net/ipv4/tcp_timer.c:587
 tcp_write_timer+0xc8/0x160 net/ipv4/tcp_timer.c:601
 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
 expire_timers+0x233/0x4d0 kernel/time/timer.c:1318
 __run_timers kernel/time/timer.c:1636 [inline]
 run_timer_softirq+0x1d8/0x5b0 kernel/time/timer.c:1649
 __do_softirq+0x254/0x9bf kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x15b/0x1a0 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x141/0x5f0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xa6/0x140 kernel/sched/core.c:3611
RSP: 0018:ffff8880679e7e20 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0f62cd3 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880a654af44
RBP: ffffed1014ca94d8 R08: ffff88821fff705c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a654a6c0
R13: ffffffff87b16698 R14: 0000000000000000 R15: 0000000000000000
 retint_kernel+0x1b/0x2d
RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x50 kernel/kcov.c:68
RSP: 0018:ffff8880679e7ef8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffff8880a654a6c0 RBX: ffffffff814fe140 RCX: 1ffff1100cf3cff5
RDX: 0000000000000001 RSI: ffffffff814fe235 RDI: ffff8880679e7fa8
RBP: ffff8880679e7f58 R08: 000000002fa41351 R09: ffffed100cf3cfcb
R10: ffffed100cf3cfca R11: ffff8880679e7e57 R12: ffffffff87b16698
R13: ffff8880679e7fd0 R14: ffff8880a654a6c0 R15: 0000000000000000
 get_current arch/x86/include/asm/current.h:15 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:253 [inline]
 do_syscall_64+0x1fd/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45f95a
RSP: 002b:00007fa674f07c58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045f95a
RDX: 0000000000001a95 RSI: 00007fa674f07c60 RDI: 0000000000000001
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003380 R14: 00000000004c38c3 R15: 00007fa674f086d4