ICMPv6: NA: someone advertises our address fe80:0000:0000:0000:0000:0000:0000:00aa on syz_tun!
INFO: rcu_preempt self-detected stall on CPU
	0-...: (1 GPs behind) idle=5ce/140000000000002/0 softirq=62857/62858 fqs=1 
	 (t=10500 jiffies g=17202 c=17201 q=36)
rcu_preempt kthread starved for 10464 jiffies! g17202 c17201 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1
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 0
CPU: 0 PID: 26736 Comm: syz-executor.5 Not tainted 4.14.183-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:orc_find arch/x86/kernel/unwind_orc.c:109 [inline]
RIP: 0010:unwind_next_frame+0x574/0x1700 arch/x86/kernel/unwind_orc.c:352
RSP: 0018:ffff8880aec07310 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 000000000000838f RBX: 1ffff11015d80e69 RCX: ffffffff81838fe2
RDX: 0000000000000007 RSI: 000000000000838f RDI: ffffffff893762cc
RBP: 0000000000000002 R08: 0000000000008390 R09: 0000000000000001
R10: 000000000001feab R11: 0000000000056071 R12: ffff8880aec073f5
R13: ffff8880aec073f8 R14: ffff8880aec07410 R15: ffff8880aec073c0
 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551
 kmem_cache_alloc_node_trace+0x153/0x400 mm/slab.c:3661
 __do_kmalloc_node mm/slab.c:3681 [inline]
 __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696
 __kmalloc_reserve.isra.0+0x35/0xd0 net/core/skbuff.c:137
 __alloc_skb+0xca/0x4c0 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:980 [inline]
 sctp_packet_transmit+0x30c/0x2d40 net/sctp/output.c:580
 sctp_outq_flush+0xc55/0x2e10 net/sctp/outqueue.c:1187
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1787 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1179 [inline]
 sctp_do_sm+0x41f/0x49f0 net/sctp/sm_sideeffect.c:1150
 sctp_generate_heartbeat_event+0x1da/0x3f0 net/sctp/sm_sideeffect.c:391
 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:__rb_insert lib/rbtree.c:201 [inline]
RIP: 0010:__rb_insert_augmented+0x25d/0x9c0 lib/rbtree.c:495
RSP: 0018:ffff888061ab7be0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 1ffff11010f6431b RBX: ffff888090909ae8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff1101212135d RDI: ffff888087b218d8
RBP: ffff888093e0ef08 R08: ffff88808a7b19a8 R09: ffffffff89e60528
R10: ffff888067c1eb40 R11: ffff888067c1e240 R12: ffff88808a7b19a0
R13: dffffc0000000000 R14: ffffffff8177ffa0 R15: ffff88808226a598
 dup_mmap kernel/fork.c:681 [inline]
 dup_mm kernel/fork.c:1199 [inline]
 copy_mm kernel/fork.c:1254 [inline]
 copy_process.part.0+0x46a4/0x6fa0 kernel/fork.c:1771
 copy_process kernel/fork.c:1586 [inline]
 _do_fork+0x180/0xc80 kernel/fork.c:2070
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45ca69
RSP: 002b:00007f34d8745c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00000000004dac00 RCX: 000000000045ca69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000078bf00 R08: 0000000020000040 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000076 R14: 00000000004c335e R15: 00007f34d87466d4