=================================
[ INFO: inconsistent lock state ]
4.9.124-g09eb2ba #35 Not tainted
---------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
ksoftirqd/0/3 [HC0[0]:SC1[1]:HE1:SE0] takes:
 (&(&rnp->exp_lock)->rlock){+.?...}, at: [<ffffffff81284c2b>] spin_lock include/linux/spinlock.h:302 [inline]
 (&(&rnp->exp_lock)->rlock){+.?...}, at: [<ffffffff81284c2b>] exp_funnel_lock kernel/rcu/tree_exp.h:271 [inline]
 (&(&rnp->exp_lock)->rlock){+.?...}, at: [<ffffffff81284c2b>] _synchronize_rcu_expedited+0x1fb/0x840 kernel/rcu/tree_exp.h:569
  mark_irqflags kernel/locking/lockdep.c:2941 [inline]
  __lock_acquire+0xdd0/0x4070 kernel/locking/lockdep.c:3302
  lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
  __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
  _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
  spin_lock include/linux/spinlock.h:302 [inline]
  rcu_exp_wait_wake+0x2d2/0x5e0 kernel/rcu/tree_exp.h:504
  rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:535 [inline]
  _synchronize_rcu_expedited+0x73c/0x840 kernel/rcu/tree_exp.h:575
  synchronize_rcu_expedited kernel/rcu/tree_exp.h:687 [inline]
  synchronize_rcu.part.62+0xd3/0x110 kernel/rcu/tree_plugin.h:682
  synchronize_rcu+0x27/0x90 kernel/rcu/tree_plugin.h:685
  rcu_test_sync_prims+0x9/0x30 kernel/rcu/update.c:829
  rcu_scheduler_starting+0x51/0x80 kernel/rcu/tree.c:4016
  rest_init+0xf/0x189 init/main.c:388
  start_kernel+0x67e/0x6b2 init/main.c:664
  x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
  x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:177
irq event stamp: 9093782
hardirqs last  enabled at (9093782): [<ffffffff8114bbca>] __local_bh_enable_ip+0x6a/0xd0 kernel/softirq.c:190
hardirqs last disabled at (9093781): [<ffffffff8114bb92>] __local_bh_enable_ip+0x32/0xd0 kernel/softirq.c:167
softirqs last  enabled at (9093708): [<ffffffff83a08825>] __do_softirq+0x475/0x940 kernel/softirq.c:314
softirqs last disabled at (9093713): [<ffffffff8114d320>] run_ksoftirqd+0x30/0x60 kernel/softirq.c:680

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&(&rnp->exp_lock)->rlock);
  <Interrupt>
    lock(&(&rnp->exp_lock)->rlock);

 *** DEADLOCK ***

1 lock held by ksoftirqd/0/3:
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] __rcu_reclaim kernel/rcu/rcu.h:108 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff81289ace>] rcu_process_callbacks+0x98e/0x12b0 kernel/rcu/tree.c:3037

stack backtrace:
CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 4.9.124-g09eb2ba #35
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d99ef498 ffffffff81eb95e9 ffff8801d99bb000 ffffffff85597020
 ffff8801d99bb8f0 ffff8801d99bb910 0000000000000000 ffff8801d99ef508
 ffffffff81429ccd 0000000000000001 0000000000000001 ffff880100000000
Call Trace:
 [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81429ccd>] print_usage_bug.cold.57+0x327/0x421 kernel/locking/lockdep.c:2387
 [<ffffffff81237726>] valid_state kernel/locking/lockdep.c:2400 [inline]
 [<ffffffff81237726>] mark_lock_irq kernel/locking/lockdep.c:2602 [inline]
 [<ffffffff81237726>] mark_lock+0xcc6/0x1280 kernel/locking/lockdep.c:3065
 [<ffffffff812390f0>] mark_irqflags kernel/locking/lockdep.c:2923 [inline]
 [<ffffffff812390f0>] __lock_acquire+0xd40/0x4070 kernel/locking/lockdep.c:3302
IPVS: Scheduler module ip_vs_sh: not found
 [<ffffffff8123ce90>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff83a00d96>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff83a00d96>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff81284c2b>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff81284c2b>] exp_funnel_lock kernel/rcu/tree_exp.h:271 [inline]
 [<ffffffff81284c2b>] _synchronize_rcu_expedited+0x1fb/0x840 kernel/rcu/tree_exp.h:569
IPVS: Scheduler module ip_vs_sh: not found
 [<ffffffff812862c3>] synchronize_rcu_expedited kernel/rcu/tree_exp.h:687 [inline]
 [<ffffffff812862c3>] synchronize_rcu.part.62+0xd3/0x110 kernel/rcu/tree_plugin.h:682
 [<ffffffff81286327>] synchronize_rcu+0x27/0x90 kernel/rcu/tree_plugin.h:685
 [<ffffffff836c4baa>] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796
 [<ffffffff836c4f37>] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364
 [<ffffffff836c57f2>] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324
 [<ffffffff830281f5>] __sk_destruct+0x55/0x590 net/core/sock.c:1428
 [<ffffffff812899ee>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812899ee>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 [<ffffffff812899ee>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 [<ffffffff812899ee>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 [<ffffffff812899ee>] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037
 [<ffffffff83a085c0>] __do_softirq+0x210/0x940 kernel/softirq.c:288
 [<ffffffff8114d320>] run_ksoftirqd+0x30/0x60 kernel/softirq.c:680
 [<ffffffff811aa5a9>] smpboot_thread_fn+0x5c9/0x900 kernel/smpboot.c:163
 [<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a01b9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:620
in_atomic(): 1, irqs_disabled(): 0, pid: 3, name: ksoftirqd/0
INFO: lockdep is turned off.
Preemption disabled at:[  478.806584] [<ffffffff83a0848d>] __do_softirq+0xdd/0x940 kernel/softirq.c:265
CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 4.9.124-g09eb2ba #35
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d99ef630 ffffffff81eb95e9 ffffffff83a0848d 0000000000000000
 0000000000000100 ffff8801d99bb000 ffff8801d99bb000 ffff8801d99ef668
 ffffffff81426851 ffff8801d99bb000 ffffffff83c5b880 000000000000026c
Call Trace:
 [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81426851>] ___might_sleep.cold.123+0x1bc/0x1f5 kernel/sched/core.c:7988
 [<ffffffff811bd9a5>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7945
 [<ffffffff839f6c67>] mutex_lock_nested+0x87/0x870 kernel/locking/mutex.c:620
IPVS: Scheduler module ip_vs_sh: not found
 [<ffffffff81284dd7>] exp_funnel_lock kernel/rcu/tree_exp.h:289 [inline]
 [<ffffffff81284dd7>] _synchronize_rcu_expedited+0x3a7/0x840 kernel/rcu/tree_exp.h:569
 [<ffffffff812862c3>] synchronize_rcu_expedited kernel/rcu/tree_exp.h:687 [inline]
 [<ffffffff812862c3>] synchronize_rcu.part.62+0xd3/0x110 kernel/rcu/tree_plugin.h:682
 [<ffffffff81286327>] synchronize_rcu+0x27/0x90 kernel/rcu/tree_plugin.h:685
 [<ffffffff836c4baa>] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796
 [<ffffffff836c4f37>] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364
 [<ffffffff836c57f2>] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324
 [<ffffffff830281f5>] __sk_destruct+0x55/0x590 net/core/sock.c:1428
 [<ffffffff812899ee>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812899ee>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 [<ffffffff812899ee>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 [<ffffffff812899ee>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 [<ffffffff812899ee>] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037
 [<ffffffff83a085c0>] __do_softirq+0x210/0x940 kernel/softirq.c:288
 [<ffffffff8114d320>] run_ksoftirqd+0x30/0x60 kernel/softirq.c:680
 [<ffffffff811aa5a9>] smpboot_thread_fn+0x5c9/0x900 kernel/smpboot.c:163
 [<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a01b9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
BUG: scheduling while atomic: ksoftirqd/0/3/0x00000101
INFO: lockdep is turned off.
Modules linked in:
Preemption disabled at:[  479.184275] [<ffffffff83a0848d>] __do_softirq+0xdd/0x940 kernel/softirq.c:265