======================================
| [ 43.846488][ T654] #0: ffffffffa07e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512)
| [ 43.846782][ T654] #1: ffffffffa07d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   43.847088][  T654]
| [   43.847088][  T654] stack backtrace:
[   43.847603][  T654] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.847786][  T654] Call Trace:
[   43.847897][  T654]  <TASK>
[ 43.847973][ T654] dump_stack_lvl (lib/dump_stack.c:123)
[ 43.848133][ T654] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 43.848282][ T654] validate_chain (kernel/locking/lockdep.c:3894)
[ 43.848436][ T654] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 43.848584][ T654] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228)
[ 43.848732][ T654] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 43.848845][ T654] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 43.848993][ T654] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 43.849138][ T654] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 43.849319][ T654] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 43.849508][ T654] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 43.849652][ T654] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 43.849798][ T654] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 43.849942][ T654] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 43.850122][ T654] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 43.850233][ T654] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 43.850417][ T654] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 43.850568][ T654] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 43.850712][ T654] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 43.850857][ T654] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 43.851016][ T654] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 43.851162][ T654] __netdev_upper_dev_unlink (net/core/dev.c:8000 (discriminator 11) net/core/dev.c:8017 (discriminator 11) net/core/dev.c:8167 (discriminator 11))
[ 43.851309][ T654] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 43.851501][ T654] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:913)
[ 43.851660][ T654] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 43.851850][ T654] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 43.851999][ T654] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 43.852152][ T654] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 43.852333][ T654] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 43.852488][ T654] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.h:47 kernel/locking/mutex.c:66)
[ 43.852638][ T654] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 43.852795][ T654] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 43.852984][ T654] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 43.853138][ T654] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 43.853284][ T654] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 43.853431][ T654] unregister_netdevice_many_notify (net/core/dev.c:11571)
[ 43.853625][ T654] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512)
[ 43.853811][ T654] ? net_generic (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48) ip6_gre
[ 43.853961][ T654] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 43.854107][ T654] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 43.854254][ T654] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 43.854399][ T654] ? unregister_netdevice_queue (net/core/dev.c:11497)
[ 43.854578][ T654] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496)
[ 43.854762][ T654] ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[ 43.854910][ T654] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518)
[ 43.855057][ T654] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 43.855220][ T654] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 43.855367][ T654] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 43.855511][ T654] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 43.855657][ T654] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 43.855804][ T654] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 43.855957][ T654] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 43.856102][ T654] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 43.856247][ T654] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902)
[ 43.856392][ T654] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 43.856537][ T654] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228)
[ 43.856680][ T654] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 43.856791][ T654] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 43.856946][ T654] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 43.857091][ T654] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 43.857236][ T654] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 43.857385][ T654] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 43.857532][ T654] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333)
[ 43.857690][ T654] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 43.857834][ T654] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 43.857980][ T654] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 43.858127][ T654] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 43.858270][ T654] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 43.858419][ T654] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 43.858563][ T654] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 43.858707][ T654] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 43.858889][ T654] ___sys_sendmsg (net/socket.c:2650)
[ 43.859042][ T654] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 43.859187][ T654] ? kasan_save_stack (mm/kasan/common.c:49)
[ 43.859333][ T654] ? kasan_save_stack (mm/kasan/common.c:48)
[ 43.859476][ T654] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 43.859621][ T654] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:123 kernel/rcu/tree.c:3087)
[ 43.859802][ T654] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 43.859949][ T654] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 43.860097][ T654] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 43.860280][ T654] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 43.860428][ T654] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 43.860575][ T654] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 43.860720][ T654] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 43.860866][ T654] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 43.861012][ T654] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 43.861163][ T654] __sys_sendmsg (net/socket.c:2680)
[ 43.861307][ T654] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 43.861451][ T654] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 43.861637][ T654] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 43.861782][ T654] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   43.861961][  T654] RIP: 0033:0x7f5cabcbb9a7
[ 43.862116][ T654] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[   43.862627][  T654] RSP: 002b:00007ffe4d8180d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   43.862850][  T654] RAX: ffffffffffffffda RBX: 00007ffe4d818800 RCX: 00007f5cabcbb9a7
[   43.863066][  T654] RDX: 0000000000000000 RSI: 00007ffe4d818140 RDI: 0000000000000005
[   43.863296][  T654] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   43.863525][  T654] R10: 00007f5cabb79ef8 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain