BUG: sleeping function called from invalid context at kernel/sched/completion.c:90
in_atomic(): 1, irqs_disabled(): 0, pid: 3, name: ksoftirqd/0
1 lock held by ksoftirqd/0/3:
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] __rcu_reclaim kernel/rcu/rcu.h:108 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] rcu_process_callbacks+0x98e/0x12b0 kernel/rcu/tree.c:3037
Preemption disabled at:[  272.789748] [<ffffffff83a0354b>] __do_softirq+0xdb/0x937 kernel/softirq.c:261
CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 4.9.118-g47b77b8 #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d99ef868 ffffffff81eb4b89 ffffffff83a0354b 0000000000000000
 0000000000000100 ffff8801d99b3000 ffff8801d99b3000 ffff8801d99ef8a0
 ffffffff814245c0 ffff8801d99b3000 ffffffff83c59f60 000000000000005a
Call Trace:
 [<ffffffff81eb4b89>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4b89>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff814245c0>] ___might_sleep.cold.123+0x1bc/0x1f5 kernel/sched/core.c:7988
 [<ffffffff811bb6c5>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7945
 [<ffffffff839f01f9>] __wait_for_common kernel/sched/completion.c:90 [inline]
 [<ffffffff839f01f9>] wait_for_common kernel/sched/completion.c:101 [inline]
 [<ffffffff839f01f9>] wait_for_completion+0x89/0x2e0 kernel/sched/completion.c:122
 [<ffffffff8127be17>] __wait_rcu_gp+0x137/0x1b0 kernel/rcu/update.c:369
 [<ffffffff812840aa>] synchronize_rcu.part.62+0xfa/0x110 kernel/rcu/tree_plugin.h:684
 [<ffffffff812840e7>] synchronize_rcu+0x27/0x90 kernel/rcu/tree_plugin.h:685
 [<ffffffff836bfc1a>] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796
 [<ffffffff836bffa7>] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364
 [<ffffffff836c0862>] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324
 [<ffffffff830230f5>] __sk_destruct+0x55/0x590 net/core/sock.c:1428
 [<ffffffff812877ae>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812877ae>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 [<ffffffff812877ae>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 [<ffffffff812877ae>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 [<ffffffff812877ae>] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037
 [<ffffffff83a0367b>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b00e>] run_ksoftirqd+0x2e/0x60 kernel/softirq.c:676
 [<ffffffff811a82c9>] smpboot_thread_fn+0x5c9/0x900 kernel/smpboot.c:163
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fcc5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
BUG: scheduling while atomic: ksoftirqd/0/3/0x00000101
1 lock held by ksoftirqd/0/3:
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] __rcu_reclaim kernel/rcu/rcu.h:108 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 #0:  (rcu_callback){......}, at: [<ffffffff8128788e>] rcu_process_callbacks+0x98e/0x12b0 kernel/rcu/tree.c:3037
Modules linked in:
Preemption disabled at:[  273.108901] [<ffffffff83a0354b>] __do_softirq+0xdb/0x937 kernel/softirq.c:261