INFO: rcu_sched self-detected stall on CPU
	0-....: (1 GPs behind) idle=63a/1/4611686018427387908 softirq=48894/48895 fqs=30952 
	 (t=125000 jiffies g=26602 c=26601 q=1545)
NMI backtrace for cpu 0
CPU: 0 PID: 14209 Comm: syz-executor6 Not tainted 4.17.0-rc4+ #54
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+0x1b9/0x294 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x151/0x192 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+0x175/0x1c2 kernel/rcu/tree.c:1376
 print_cpu_stall kernel/rcu/tree.c:1525 [inline]
 check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:kmem_cache_free+0xb3/0x2d0 mm/slab.c:3757
RSP: 0000:ffff8801dae06658 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff88013ae39040 RCX: 1ffff10032cb2988
RDX: 0000000000000000 RSI: ffff880196594c20 RDI: 0000000000000286
RBP: ffff8801dae06678 R08: ffff880196594bf8 R09: 0000000000000002
R10: ffff8801965943c0 R11: 0000000000000000 R12: ffff8801d9a11080
R13: 0000000000000286 R14: ffffffff85d8715c R15: 0000000000000000
 kfree_skbmem+0x13c/0x210 net/core/skbuff.c:582
 __kfree_skb net/core/skbuff.c:642 [inline]
 consume_skb+0x193/0x550 net/core/skbuff.c:701
 sctp_chunk_destroy net/sctp/sm_make_chunk.c:1462 [inline]
 sctp_chunk_put+0x2c0/0x440 net/sctp/sm_make_chunk.c:1489
 sctp_chunk_free+0x53/0x60 net/sctp/sm_make_chunk.c:1476
 sctp_packet_transmit+0xf66/0x3ba0 net/sctp/output.c:650
 sctp_outq_flush_transports net/sctp/outqueue.c:1164 [inline]
 sctp_outq_flush+0x5f5/0x3430 net/sctp/outqueue.c:1212
 sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:776
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x596/0x7160 net/sctp/sm_sideeffect.c:1191
 sctp_generate_heartbeat_event+0x218/0x450 net/sctp/sm_sideeffect.c:406
 call_timer_fn+0x230/0x940 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0x79e/0xc50 kernel/time/timer.c:1666
 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x1d1/0x200 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:525 [inline]
 smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
 </IRQ>
RIP: 0033:0x40af6c
RSP: 002b:0000000000a3e8b0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffffffff86e6d128 RBX: 00000000c8e95426 RCX: 0000000000000000
RDX: 0000000062b4092d RSI: 000000000000092d RDI: ffffffff62b4092d
RBP: 0000000000000128 R08: 0000000062b4092d R09: 0000000062b40931
R10: 0000000000a3e940 R11: 0000000000000000 R12: 000000000072bea0
R13: 0000000080000000 R14: 00007f67d46c6008 R15: 0000000000003df3