device lo left promiscuous mode
device lo entered promiscuous mode
device lo left promiscuous mode
device lo entered promiscuous mode
device lo left promiscuous mode
INFO: task syz-executor465:3908 blocked for more than 120 seconds.
      Not tainted 4.9.106-g8b94b87 #46
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor465 D29992  3908   3897 0x00000000
 ffff8801d7ee0000 0000000000000000 ffff8801da316a00 ffff8801b9304800
 ffff8801db321c18 ffff8801d6d2fbc8 ffffffff839e8c0d ffff8801d7ee08c8
 ffffed003afdc118 ffff8801d7ee0000 00fffc0000000000 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea20f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839eab93>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839ef016>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839ef016>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff8305d085>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
 [<ffffffff811a06bc>] create_new_namespaces+0x51c/0x730 kernel/nsproxy.c:106
 [<ffffffff811a0eb5>] unshare_nsproxy_namespaces+0xa5/0x1d0 kernel/nsproxy.c:205
 [<ffffffff81135599>] SYSC_unshare kernel/fork.c:2244 [inline]
 [<ffffffff81135599>] SyS_unshare+0x319/0x710 kernel/fork.c:2194
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b6c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b6c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426150>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3663:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d844c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3759:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cb2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821200c2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor465/3908:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff8305d085>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
1 lock held by syz-executor465/3912:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff8305d085>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
1 lock held by syz-executor465/3909:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff8305d085>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
1 lock held by syz-executor465/3914:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b5937>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by syz-executor465/3910:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff8305d085>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.106-g8b94b87 #46
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8b07d08 ffffffff81eb4209 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b96a0 ffff8801d8b07d40
 ffffffff81ebf507 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4209>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4209>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf507>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf49a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
device lo entered promiscuous mode
 [<ffffffff810b97a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81367104>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81367104>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367104>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367104>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3905 Comm: syz-executor465 Not tainted 4.9.106-g8b94b87 #46
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d71fb000 task.stack: ffff8801d6df0000
RIP: 0010:[<ffffffff810d2b86>] 
c [<ffffffff810d2b86>] unwind_get_return_address+0x16/0xb0 arch/x86/kernel/unwind_frame.c:10
RSP: 0018:ffff8801d6df70b0  EFLAGS: 00000a02
RAX: dffffc0000000000 RBX: ffff8801d6df7150 RCX: ffff8801d6df7968
RDX: 1ffff1003adbee19 RSI: ffff8801d6df7958 RDI: ffff8801d6df70c8
RBP: ffff8801d6df70b8 R08: ffffed003adbee21 R09: ffff8801d6df0000
R10: ffffed003adbee20 R11: ffff8801d6df7107 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8801d71fb000 R15: ffff8801cdb3eebf
FS:  00000000011b2880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 00000001d6dce000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d6df7150
c ffff8801d6df7130
c ffffffff8107b9ed
c 0000000000000001
c
 ffff8801d6df0000
c ffff8801d6df8000
c 0000000000000000
c 0000000000000002
c
 ffff8801d71fb000
c 0000000000000000
c ffff8801d6df7958
c 483edcf1688ae677
c
Call Trace:
 [<ffffffff8107b9ed>] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43
 [<ffffffff8107ba66>] save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 [<ffffffff8153ae83>] save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 [<ffffffff8153b267>] set_track mm/kasan/kasan.c:517 [inline]
 [<ffffffff8153b267>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609
 [<ffffffff8153b832>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547
 [<ffffffff81537752>] slab_post_alloc_hook mm/slab.h:417 [inline]
 [<ffffffff81537752>] slab_alloc_node mm/slub.c:2715 [inline]
 [<ffffffff81537752>] slab_alloc mm/slub.c:2723 [inline]
 [<ffffffff81537752>] __kmalloc+0xe2/0x300 mm/slub.c:3737
 [<ffffffff8344d414>] kmalloc include/linux/slab.h:495 [inline]
 [<ffffffff8344d414>] kzalloc include/linux/slab.h:636 [inline]
 [<ffffffff8344d414>] fib_create_info+0x8d4/0x4730 net/ipv4/fib_semantics.c:1049
 [<ffffffff8345deb6>] fib_table_insert+0x186/0x1600 net/ipv4/fib_trie.c:1133
 [<ffffffff83442aae>] fib_magic.isra.23+0x2ae/0x330 net/ipv4/fib_frontend.c:844
 [<ffffffff83448cd8>] fib_add_ifaddr+0x3b8/0x6d0 net/ipv4/fib_frontend.c:878
 [<ffffffff83449103>] fib_netdev_event+0x113/0x320 net/ipv4/fib_frontend.c:1192
 [<ffffffff811a1864>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93
 [<ffffffff811a19ed>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff811a19ed>] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
 [<ffffffff83068f85>] call_netdevice_notifiers_info+0x55/0x70 net/core/dev.c:1647
 [<ffffffff8308d126>] call_netdevice_notifiers net/core/dev.c:1663 [inline]
 [<ffffffff8308d126>] __dev_notify_flags+0xf6/0x270 net/core/dev.c:6513
 [<ffffffff8308e343>] dev_change_flags+0xf3/0x140 net/core/dev.c:6546
 [<ffffffff8341d2a1>] devinet_ioctl+0x9d1/0x15d0 net/ipv4/devinet.c:1052
 [<ffffffff834233ee>] inet_ioctl+0x11e/0x1d0 net/ipv4/af_inet.c:908
 [<ffffffff830110ea>] sock_do_ioctl+0x6a/0xb0 net/socket.c:892
 [<ffffffff83011ba6>] sock_ioctl+0x346/0x3e0 net/socket.c:978
 [<ffffffff815b2fac>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b2fac>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b2fac>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b402f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b402f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c