INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
	1-....: (124999 ticks this GP) idle=9da/140000000000001/0 softirq=17566/17566 fqs=31224 
	(detected by 0, t=125002 jiffies, g=9749, c=9748, q=829)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8467 Comm: syz-executor2 Not tainted 4.15.0-rc9+ #209
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:inb arch/x86/include/asm/io.h:348 [inline]
RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:434
RSP: 0018:ffff8801db306ff8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff88872f58
RBP: ffff8801db307008 R08: 1ffff1003b660d57 R09: 000000000000000c
R10: ffff8801db306f78 R11: 0000000000000040 R12: ffffffff88872f20
R13: 0000000000000020 R14: fffffbfff110e629 R15: fffffbfff110e5ed
FS:  00007f516eba6700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000209ff000 CR3: 00000001c7bc8003 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 wait_for_xmitr+0x93/0x1e0 drivers/tty/serial/8250/8250_port.c:2033
 serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3170
 uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1858
 serial8250_console_write+0x64f/0xa40 drivers/tty/serial/8250/8250_port.c:3236
 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590
 call_console_drivers kernel/printk/printk.c:1574 [inline]
 console_unlock+0x788/0xd80 kernel/printk/printk.c:2233
 vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1757
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1796
 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379
 printk+0xaa/0xca kernel/printk/printk.c:1829
 print_cpu_stall_info_begin kernel/rcu/tree_plugin.h:1657 [inline]
 print_cpu_stall kernel/rcu/tree.c:1594 [inline]
 check_cpu_stall.isra.61+0x845/0x15b0 kernel/rcu/tree.c:1676
 __rcu_pending kernel/rcu/tree.c:3440 [inline]
 rcu_pending kernel/rcu/tree.c:3502 [inline]
 rcu_check_callbacks+0x256/0xd00 kernel/rcu/tree.c:2842
 update_process_times+0x30/0x60 kernel/time/timer.c:1628
 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162
 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194
 __run_hrtimer kernel/time/hrtimer.c:1211 [inline]
 __hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1275
 hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1309
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:937
 </IRQ>
RIP: 0010:xfrm_get_dst_nexthop net/xfrm/xfrm_policy.c:2732 [inline]
RIP: 0010:xfrm_confirm_neigh+0xb7/0x270 net/xfrm/xfrm_policy.c:2759
RSP: 0018:ffff8801abe37830 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11
RAX: 0000000000000000 RBX: ffff8801d832d200 RCX: ffffffff84acc75d
RDX: 0000000000000004 RSI: ffffc900031bc000 RDI: ffff8801cb70af50
RBP: ffff8801abe37868 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cb70ae00
R13: dffffc0000000000 R14: ffffed003b065a5f R15: ffff8801d832d2fc
 dst_confirm_neigh include/net/dst.h:419 [inline]
 raw_sendmsg+0xece/0x23b0 net/ipv4/raw.c:689
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 SYSC_sendto+0x361/0x5c0 net/socket.c:1747
 SyS_sendto+0x40/0x50 net/socket.c:1715
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007f516eba5c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f516eba6700 RCX: 0000000000452f19
RDX: 0000000000000000 RSI: 0000000020098000 RDI: 0000000000000013
RBP: 0000000000000000 R08: 0000000020cf9000 R09: 0000000000000010
R10: fffffffffffffffc R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7cf R14: 00007f516eba69c0 R15: 0000000000000000
Code: 24 d1 00 00 00 49 8d 7c 24 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 38 89 da ec <5b> 0f b6 c0 41 5c 5d c3 e8 48 53 10 ff eb c2 e8 a1 53 10 ff eb 
	1-....: (124999 ticks this GP) idle=9da/140000000000001/0 softirq=17566/17566 fqs=31404 
	 (t=125723 jiffies g=9749 c=9748 q=829)
NMI backtrace for cpu 1
CPU: 1 PID: 8467 Comm: syz-executor2 Not tainted 4.15.0-rc9+ #209
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+0x194/0x257 lib/dump_stack.c:53
 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x122/0x180 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:156 [inline]
 rcu_dump_cpu_stacks+0x186/0x1d9 kernel/rcu/tree.c:1459
 print_cpu_stall kernel/rcu/tree.c:1608 [inline]
 check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1676
 __rcu_pending kernel/rcu/tree.c:3440 [inline]
 rcu_pending kernel/rcu/tree.c:3502 [inline]
 rcu_check_callbacks+0x256/0xd00 kernel/rcu/tree.c:2842
 update_process_times+0x30/0x60 kernel/time/timer.c:1628
 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162
 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194
 __run_hrtimer kernel/time/hrtimer.c:1211 [inline]
 __hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1275
 hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1309
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:937
 </IRQ>
RIP: 0010:xfrm_get_dst_nexthop net/xfrm/xfrm_policy.c:2732 [inline]
RIP: 0010:xfrm_confirm_neigh+0xb7/0x270 net/xfrm/xfrm_policy.c:2759
RSP: 0018:ffff8801abe37830 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11
RAX: 0000000000000000 RBX: ffff8801d832d200 RCX: ffffffff84acc75d
RDX: 0000000000000004 RSI: ffffc900031bc000 RDI: ffff8801cb70af50
RBP: ffff8801abe37868 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cb70ae00
R13: dffffc0000000000 R14: ffffed003b065a5f R15: ffff8801d832d2fc
 dst_confirm_neigh include/net/dst.h:419 [inline]
 raw_sendmsg+0xece/0x23b0 net/ipv4/raw.c:689
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 SYSC_sendto+0x361/0x5c0 net/socket.c:1747
 SyS_sendto+0x40/0x50 net/socket.c:1715
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007f516eba5c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f516eba6700 RCX: 0000000000452f19
RDX: 0000000000000000 RSI: 0000000020098000 RDI: 0000000000000013
RBP: 0000000000000000 R08: 0000000020cf9000 R09: 0000000000000010
R10: fffffffffffffffc R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7cf R14: 00007f516eba69c0 R15: 0000000000000000