------------[ cut here ]------------
WARNING: CPU: 0 PID: 5108 at kernel/sched/core.c:7926 __might_sleep+0x149/0x1a0 kernel/sched/core.c:7921
do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff81141eb5>] do_wait+0x335/0x950 kernel/exit.c:1587
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5108 Comm: syz-executor5 Not tainted 4.9.77-ge12a9c4 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db207b18 ffffffff81d941c9 ffffffff83a47bc0 ffff8801db207bf0
 ffffffff83a55100 ffffffff811b9de9 0000000000000009 ffff8801db207be0
 ffffffff8142f3c1 0000000041b58ab3 ffffffff8418ab70 ffffffff8142f205
Call Trace:
 <IRQ> [   63.191027]  [<ffffffff81d941c9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [   63.191027]  [<ffffffff81d941c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f3c1>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81131144>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff81131224>] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565
 [<ffffffff811b9de9>] __might_sleep+0x149/0x1a0 kernel/sched/core.c:7921
 [<ffffffff82ee3fe4>] lock_sock_nested+0x34/0x120 net/core/sock.c:2502
 [<ffffffff832e8152>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff832e8152>] inet_shutdown+0x62/0x350 net/ipv4/af_inet.c:823
 [<ffffffff835896a0>] pppol2tp_session_close+0xa0/0xe0 net/l2tp/l2tp_ppp.c:441
 [<ffffffff8358409f>] l2tp_tunnel_closeall+0x21f/0x3a0 net/l2tp/l2tp_core.c:1368
 [<ffffffff8358498e>] l2tp_tunnel_destruct+0x30e/0x5a0 net/l2tp/l2tp_core.c:1324
 [<ffffffff82ee5033>] __sk_destruct+0x53/0x570 net/core/sock.c:1428
 [<ffffffff812930f8>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812930f8>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 [<ffffffff812930f8>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 [<ffffffff812930f8>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 [<ffffffff812930f8>] rcu_process_callbacks+0x898/0x1300 kernel/rcu/tree.c:3037
 [<ffffffff838b9846>] __do_softirq+0x206/0x951 kernel/softirq.c:284
 [<ffffffff81146bc5>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81146bc5>] irq_exit+0x165/0x190 kernel/softirq.c:405
 [<ffffffff838b845b>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff838b845b>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff838b46e0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> [   63.377342]  [<ffffffff838b246f>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline]
 <EOI> [   63.377342]  [<ffffffff838b246f>] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 <EOI> [   63.377342]  [<ffffffff838b246f>] ? _raw_spin_unlock_irqrestore+0x5f/0x70 kernel/locking/spinlock.c:191
 [<ffffffff81bd822a>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline]
 [<ffffffff81bd822a>] avc_reclaim_node security/selinux/avc.c:543 [inline]
 [<ffffffff81bd822a>] avc_alloc_node+0x27a/0x3e0 security/selinux/avc.c:561
 [<ffffffff81bd90b2>] avc_insert security/selinux/avc.c:672 [inline]
 [<ffffffff81bd90b2>] avc_compute_av+0x182/0x640 security/selinux/avc.c:978
 [<ffffffff81bdb1d8>] avc_has_perm_noaudit security/selinux/avc.c:1114 [inline]
 [<ffffffff81bdb1d8>] avc_has_perm+0x378/0x4f0 security/selinux/avc.c:1148
 [<ffffffff81bee240>] task_has_perm+0x200/0x340 security/selinux/hooks.c:1631
 [<ffffffff81bee3a3>] selinux_task_wait+0x23/0x30 security/selinux/hooks.c:3966
 [<ffffffff81bd41dd>] security_task_wait+0x6d/0xa0 security/security.c:1032
 [<ffffffff8113e701>] wait_consider_task+0x221/0x36a0 kernel/exit.c:1377
 [<ffffffff81141fa3>] do_wait_thread kernel/exit.c:1490 [inline]
 [<ffffffff81141fa3>] do_wait+0x423/0x950 kernel/exit.c:1561
 [<ffffffff81142fde>] SYSC_wait4 kernel/exit.c:1689 [inline]
 [<ffffffff81142fde>] SyS_wait4+0x10e/0x1d0 kernel/exit.c:1658
 [<ffffffff838b2c2e>] entry_SYSCALL_64_fastpath+0x29/0xe8
Shutting down cpus with NMI
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..