IPVS: Creating netns size=2536 id=46
IPVS: Creating netns size=2536 id=47
------------[ cut here ]------------
WARNING: CPU: 0 PID: 18783 at kernel/locking/mutex.c:873 __mutex_trylock_slowpath kernel/locking/mutex.c:873 [inline]
WARNING: CPU: 0 PID: 18783 at kernel/locking/mutex.c:873 mutex_trylock+0x2f9/0x3e0 kernel/locking/mutex.c:908
DEBUG_LOCKS_WARN_ON(in_interrupt())[  273.356045] Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 18783 Comm: syz-executor3 Not tainted 4.9.119-g9dc978d #75
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db2077f8 ffffffff81eb4be9 ffffffff83c48980 00000000ffffffff
 0000000000000000 0000000000000000 0000000000000369 ffff8801db2078b8
 ffffffff81421c95 0000000041b58ab3 ffffffff843bc020 ffffffff81421ad6
Call Trace:
 <IRQ> [  273.409164]  [<ffffffff81eb4be9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [  273.409164]  [<ffffffff81eb4be9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81421c95>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81421f81>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff811366d2>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff839f1dc9>] __mutex_trylock_slowpath kernel/locking/mutex.c:873 [inline]
 [<ffffffff839f1dc9>] mutex_trylock+0x2f9/0x3e0 kernel/locking/mutex.c:908
 [<ffffffff81282b49>] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline]
 [<ffffffff81282b49>] _synchronize_rcu_expedited+0x339/0x840 kernel/rcu/tree_exp.h:569
 [<ffffffff812840a3>] synchronize_rcu_expedited kernel/rcu/tree_exp.h:687 [inline]
 [<ffffffff812840a3>] synchronize_rcu.part.62+0xd3/0x110 kernel/rcu/tree_plugin.h:682
 [<ffffffff81284107>] synchronize_rcu+0x27/0x90 kernel/rcu/tree_plugin.h:685
 [<ffffffff836bfe3a>] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796
 [<ffffffff836c01c7>] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364
 [<ffffffff836c0a82>] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324
 [<ffffffff830230f5>] __sk_destruct+0x55/0x590 net/core/sock.c:1428
 [<ffffffff812877ce>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812877ce>] rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 [<ffffffff812877ce>] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 [<ffffffff812877ce>] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 [<ffffffff812877ce>] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037
 [<ffffffff83a038bb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b277>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff8114b277>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff83a024a1>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff83a024a1>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff839fe630>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> [  273.689175]  [<ffffffff830352b6>] ? kmem_cache_alloc_node include/linux/slab.h:364 [inline]
 <EOI> [  273.689175]  [<ffffffff830352b6>] ? __alloc_skb+0xe6/0x5b0 net/core/skbuff.c:219
 [<ffffffff81537219>] slab_alloc_node mm/slub.c:2681 [inline]
 [<ffffffff81537219>] slab_alloc mm/slub.c:2723 [inline]
 [<ffffffff81537219>] kmem_cache_alloc+0x159/0x290 mm/slub.c:2728
 [<ffffffff830352b6>] kmem_cache_alloc_node include/linux/slab.h:364 [inline]
 [<ffffffff830352b6>] __alloc_skb+0xe6/0x5b0 net/core/skbuff.c:219
 [<ffffffff81ebe637>] alloc_skb include/linux/skbuff.h:919 [inline]
 [<ffffffff81ebe637>] kobject_uevent_env+0x587/0xb80 lib/kobject_uevent.c:300
 [<ffffffff81ebec4f>] kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374
 [<ffffffff830e7eb1>] rx_queue_add_kobject net/core/net-sysfs.c:923 [inline]
 [<ffffffff830e7eb1>] net_rx_queue_update_kobjects+0x2d1/0x3d0 net/core/net-sysfs.c:945
 [<ffffffff830e85c1>] register_queue_kobjects net/core/net-sysfs.c:1368 [inline]
 [<ffffffff830e85c1>] netdev_register_kobject+0x271/0x360 net/core/net-sysfs.c:1572
 [<ffffffff83091da3>] register_netdevice+0x873/0xe70 net/core/dev.c:7292
 [<ffffffff830923ba>] register_netdev+0x1a/0x30 net/core/dev.c:7404
 [<ffffffff836726be>] sit_init_net+0x2de/0x850 net/ipv6/sit.c:1839
 [<ffffffff8305d85c>] ops_init+0xac/0x380 net/core/net_namespace.c:111
 [<ffffffff8305dce9>] setup_net+0x1b9/0x3f0 net/core/net_namespace.c:291
 [<ffffffff8305f189>] copy_net_ns+0x189/0x290 net/core/net_namespace.c:408
 [<ffffffff811a075c>] create_new_namespaces+0x51c/0x730 kernel/nsproxy.c:106
 [<ffffffff811a0f55>] unshare_nsproxy_namespaces+0xa5/0x1d0 kernel/nsproxy.c:205
 [<ffffffff81135609>] SYSC_unshare kernel/fork.c:2254 [inline]
 [<ffffffff81135609>] SyS_unshare+0x319/0x710 kernel/fork.c:2204
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fccd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..