INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
	1-...!: (124997 ticks this GP) idle=ece/1/4611686018427387906 softirq=31198/31198 fqs=0 
	(detected by 0, t=125002 jiffies, g=16801, c=16800, q=50)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13756 Comm: syz-executor0 Not tainted 4.15.0-rc6-mm1+ #51
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:ffff8801db506ce8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff87e4ff18
RBP: ffff8801db506cf8 R08: ffffffff82548885 R09: 000000000000000c
R10: ffff8801db506d10 R11: 0000000000000001 R12: ffffffff87e4fee0
R13: 0000000000000020 R14: fffffbfff0fca021 R15: fffffbfff0fc9fe5
FS:  00007f760b5df700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ea5000 CR3: 00000001cdb62005 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+0x5b3/0x940 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:1581 [inline]
 console_unlock+0x6c1/0xc40 kernel/printk/printk.c:2254
 vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1764
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1803
 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379
 printk+0xaa/0xca kernel/printk/printk.c:1836
 print_cpu_stall_info_begin kernel/rcu/tree_plugin.h:1686 [inline]
 print_cpu_stall kernel/rcu/tree.c:1510 [inline]
 check_cpu_stall kernel/rcu/tree.c:1592 [inline]
 __rcu_pending kernel/rcu/tree.c:3362 [inline]
 rcu_pending kernel/rcu/tree.c:3424 [inline]
 rcu_check_callbacks+0xb68/0x1de0 kernel/rcu/tree.c:2764
 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:1176
 __run_hrtimer kernel/time/hrtimer.c:1210 [inline]
 __hrtimer_run_queues+0x2c8/0xb50 kernel/time/hrtimer.c:1274
 hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1308
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0xc9/0x4c0 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:920
RIP: 0010:__sanitizer_cov_trace_pc+0x1e/0x50 kernel/kcov.c:97
RSP: 0018:ffff8801db5074c8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff11
RAX: ffff8801cb9940c0 RBX: ffff8801d125a180 RCX: ffffffff8440bc6b
RDX: 0000000000000100 RSI: ffff8801a3040300 RDI: 0000000000000000
RBP: ffff8801db5074c8 R08: ffffed003460a03c R09: ffffed003460a03c
R10: 000000000000000b R11: ffffed003460a03b R12: ffff8801a3040318
R13: ffff8801db507748 R14: 000000000000b410 R15: dffffc0000000000
 _decode_session6+0x9eb/0x1380 net/ipv6/xfrm6_policy.c:160
 __xfrm_decode_session+0x68/0x110 net/xfrm/xfrm_policy.c:2359
 __xfrm_policy_check+0x13b/0x1dc0 net/xfrm/xfrm_policy.c:2394
 __xfrm_policy_check2 include/net/xfrm.h:1170 [inline]
 xfrm_policy_check include/net/xfrm.h:1175 [inline]
 xfrm6_policy_check include/net/xfrm.h:1185 [inline]
 rawv6_rcv+0x824/0x1030 net/ipv6/raw.c:424
 ipv6_raw_deliver net/ipv6/raw.c:224 [inline]
 raw6_local_deliver+0x6b6/0x870 net/ipv6/raw.c:240
 ip6_input_finish+0x342/0x1560 net/ipv6/ip6_input.c:246
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip6_input+0xcd/0x340 net/ipv6/ip6_input.c:327
 dst_input include/net/dst.h:449 [inline]
 ip6_rcv_finish+0x151/0x640 net/ipv6/ip6_input.c:71
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ipv6_rcv+0xe49/0x1cf0 net/ipv6/ip6_input.c:208
 __netif_receive_skb_core+0x13df/0x2c80 net/core/dev.c:4511
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4576
 process_backlog+0x203/0x740 net/core/dev.c:5256
 napi_poll net/core/dev.c:5654 [inline]
 net_rx_action+0x487/0xf80 net/core/dev.c:5720
 __do_softirq+0x23f/0x99f kernel/softirq.c:285
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1133
 </IRQ>
 do_softirq.part.21+0x14d/0x190 kernel/softirq.c:329
 do_softirq kernel/softirq.c:177 [inline]
 __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:726 [inline]
 ip6_finish_output2+0xa73/0x2010 net/ipv6/ip6_output.c:121
 ip6_finish_output+0x698/0xaf0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip6_output+0x1dd/0x680 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:443 [inline]
 ip6_local_out+0x95/0x160 net/ipv6/output_core.c:176
 ip6_send_skb+0xa1/0x330 net/ipv6/ip6_output.c:1674
 ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1694
 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
 rawv6_sendmsg+0x1f93/0x2a30 net/ipv6/raw.c:935
 inet_sendmsg+0xe0/0x4b0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 SYSC_sendto+0x2e0/0x360 net/socket.c:1719
 SyS_sendto+0x40/0x50 net/socket.c:1687
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f760b5dec58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 000000000000ff95 RSI: 0000000020e95d21 RDI: 0000000000000013
RBP: 0000000000000009 R08: 0000000020ec6fe4 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee178
R13: 00000000ffffffff R14: 00007f760b5df6d4 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 f8 57 36 ff eb c2 e8 51 58 36 ff eb 
rcu_sched kthread starved for 125002 jiffies! g16801 c16800 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1
rcu_sched       I29712     8      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2800 [inline]
 __schedule+0x850/0x1e10 kernel/sched/core.c:3376
 schedule+0x7c/0x1a0 kernel/sched/core.c:3435
 schedule_timeout+0x46d/0x1150 kernel/time/timer.c:1816
 rcu_gp_kthread+0xbfd/0x19f0 kernel/rcu/tree.c:2231
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
	1-...!: (124997 ticks this GP) idle=ece/1/4611686018427387906 softirq=31198/31198 fqs=0 
	 (t=125898 jiffies g=16801 c=16800 q=50)
rcu_sched kthread starved for 125903 jiffies! g16801 c16800 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1
rcu_sched       R  running task    29712     8      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2800 [inline]
 __schedule+0x850/0x1e10 kernel/sched/core.c:3376
 schedule+0x7c/0x1a0 kernel/sched/core.c:3435
 schedule_timeout+0x46d/0x1150 kernel/time/timer.c:1816
 rcu_gp_kthread+0xbfd/0x19f0 kernel/rcu/tree.c:2231
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
NMI backtrace for cpu 1
CPU: 1 PID: 13756 Comm: syz-executor0 Not tainted 4.15.0-rc6-mm1+ #51
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+0x137/0x198 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+0x186/0x1d7 kernel/rcu/tree.c:1375
 print_cpu_stall kernel/rcu/tree.c:1524 [inline]
 check_cpu_stall kernel/rcu/tree.c:1592 [inline]
 __rcu_pending kernel/rcu/tree.c:3362 [inline]
 rcu_pending kernel/rcu/tree.c:3424 [inline]
 rcu_check_callbacks+0x1a64/0x1de0 kernel/rcu/tree.c:2764
 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:1176
 __run_hrtimer kernel/time/hrtimer.c:1210 [inline]
 __hrtimer_run_queues+0x2c8/0xb50 kernel/time/hrtimer.c:1274
 hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1308
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0xc9/0x4c0 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:920
RIP: 0010:__sanitizer_cov_trace_pc+0x1e/0x50 kernel/kcov.c:97
RSP: 0018:ffff8801db5074c8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff11
RAX: ffff8801cb9940c0 RBX: ffff8801d125a180 RCX: ffffffff8440bc6b
RDX: 0000000000000100 RSI: ffff8801a3040300 RDI: 0000000000000000
RBP: ffff8801db5074c8 R08: ffffed003460a03c R09: ffffed003460a03c
R10: 000000000000000b R11: ffffed003460a03b R12: ffff8801a3040318
R13: ffff8801db507748 R14: 000000000000b410 R15: dffffc0000000000
 _decode_session6+0x9eb/0x1380 net/ipv6/xfrm6_policy.c:160
 __xfrm_decode_session+0x68/0x110 net/xfrm/xfrm_policy.c:2359
 __xfrm_policy_check+0x13b/0x1dc0 net/xfrm/xfrm_policy.c:2394
 __xfrm_policy_check2 include/net/xfrm.h:1170 [inline]
 xfrm_policy_check include/net/xfrm.h:1175 [inline]
 xfrm6_policy_check include/net/xfrm.h:1185 [inline]
 rawv6_rcv+0x824/0x1030 net/ipv6/raw.c:424
 ipv6_raw_deliver net/ipv6/raw.c:224 [inline]
 raw6_local_deliver+0x6b6/0x870 net/ipv6/raw.c:240
 ip6_input_finish+0x342/0x1560 net/ipv6/ip6_input.c:246
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip6_input+0xcd/0x340 net/ipv6/ip6_input.c:327
 dst_input include/net/dst.h:449 [inline]
 ip6_rcv_finish+0x151/0x640 net/ipv6/ip6_input.c:71
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ipv6_rcv+0xe49/0x1cf0 net/ipv6/ip6_input.c:208
 __netif_receive_skb_core+0x13df/0x2c80 net/core/dev.c:4511
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4576
 process_backlog+0x203/0x740 net/core/dev.c:5256
 napi_poll net/core/dev.c:5654 [inline]
 net_rx_action+0x487/0xf80 net/core/dev.c:5720
 __do_softirq+0x23f/0x99f kernel/softirq.c:285
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1133
 </IRQ>
 do_softirq.part.21+0x14d/0x190 kernel/softirq.c:329
 do_softirq kernel/softirq.c:177 [inline]
 __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:726 [inline]
 ip6_finish_output2+0xa73/0x2010 net/ipv6/ip6_output.c:121
 ip6_finish_output+0x698/0xaf0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip6_output+0x1dd/0x680 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:443 [inline]
 ip6_local_out+0x95/0x160 net/ipv6/output_core.c:176
 ip6_send_skb+0xa1/0x330 net/ipv6/ip6_output.c:1674
 ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1694
 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
 rawv6_sendmsg+0x1f93/0x2a30 net/ipv6/raw.c:935
 inet_sendmsg+0xe0/0x4b0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 SYSC_sendto+0x2e0/0x360 net/socket.c:1719
 SyS_sendto+0x40/0x50 net/socket.c:1687
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f760b5dec58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 000000000000ff95 RSI: 0000000020e95d21 RDI: 0000000000000013
RBP: 0000000000000009 R08: 0000000020ec6fe4 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee178
R13: 00000000ffffffff R14: 00007f760b5df6d4 R15: 0000000000000000