======================================
| [ 459.617714][ T2112] #0: ffffffffb1fe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 459.618093][ T2112] #1: ffffffffb1fd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [  459.618586][ T2112]
| [  459.618586][ T2112] stack backtrace:
[  459.619196][ T2112] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  459.619500][ T2112] Call Trace:
[  459.619693][ T2112]  <TASK>
[ 459.619822][ T2112] dump_stack_lvl (lib/dump_stack.c:123)
[ 459.620086][ T2112] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 459.620344][ T2112] validate_chain (kernel/locking/lockdep.c:3894)
[ 459.620601][ T2112] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 459.620851][ T2112] ? 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)
[ 459.621114][ T2112] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 459.621309][ T2112] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 459.621561][ T2112] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 459.621812][ T2112] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 459.622138][ T2112] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 459.622458][ T2112] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 459.622708][ T2112] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 459.622967][ T2112] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 459.623215][ T2112] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 459.623532][ T2112] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 459.623723][ T2112] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 459.624052][ T2112] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 459.624301][ T2112] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 459.624556][ T2112] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 459.624809][ T2112] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 459.625047][ T2112] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 459.625291][ T2112] __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))
[ 459.625494][ T2112] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 459.625704][ T2112] ? __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)
[ 459.625867][ T2112] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 459.626069][ T2112] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 459.626247][ T2112] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 459.626410][ T2112] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 459.626608][ T2112] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 459.626782][ T2112] ? 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)
[ 459.626945][ T2112] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 459.627112][ T2112] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 459.627328][ T2112] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 459.627494][ T2112] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 459.627654][ T2112] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 459.627819][ T2112] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 459.628030][ T2112] ? 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)
[ 459.628200][ T2112] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 459.628341][ T2112] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 459.628541][ T2112] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 459.628741][ T2112] ? kfree (mm/slub.c:4613 mm/slub.c:4761)
[ 459.628866][ T2112] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[ 459.629032][ T2112] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[ 459.629212][ T2112] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 459.629378][ T2112] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 459.629555][ T2112] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 459.629716][ T2112] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 459.629875][ T2112] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 459.630035][ T2112] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 459.630202][ T2112] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 459.630370][ T2112] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 459.630530][ T2112] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 459.630696][ T2112] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 459.630862][ T2112] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 459.631023][ T2112] ? 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)
[ 459.631191][ T2112] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 459.631313][ T2112] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 459.631476][ T2112] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 459.631644][ T2112] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 459.631809][ T2112] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 459.631994][ T2112] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 459.632177][ T2112] ? 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)
[ 459.632377][ T2112] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 459.632539][ T2112] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 459.632701][ T2112] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 459.632871][ T2112] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 459.633034][ T2112] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 459.633206][ T2112] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 459.633371][ T2112] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 459.633529][ T2112] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 459.633733][ T2112] ___sys_sendmsg (net/socket.c:2650)
[ 459.633892][ T2112] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 459.634061][ T2112] ? kasan_save_stack (mm/kasan/common.c:49)
[ 459.634231][ T2112] ? kasan_save_stack (mm/kasan/common.c:48)
[ 459.634389][ T2112] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 459.634552][ T2112] ? __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)
[ 459.634754][ T2112] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 459.634919][ T2112] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 459.635083][ T2112] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 459.635311][ T2112] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 459.635476][ T2112] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 459.635638][ T2112] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 459.635821][ T2112] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 459.635986][ T2112] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 459.636152][ T2112] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 459.636314][ T2112] __sys_sendmsg (net/socket.c:2680)
[ 459.636481][ T2112] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 459.636641][ T2112] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 459.636845][ T2112] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 459.637016][ T2112] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  459.637228][ T2112] RIP: 0033:0x7f11e6f919a7
[ 459.637400][ T2112] 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)
[  459.637965][ T2112] RSP: 002b:00007fff68903238 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  459.638261][ T2112] RAX: ffffffffffffffda RBX: 00007fff68903960 RCX: 00007f11e6f919a7
[  459.638501][ T2112] RDX: 0000000000000000 RSI: 00007fff689032a0 RDI: 0000000000000005
[  459.638752][ T2112] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  459.639002][ T2112] R10: 00007f11e6e4fef8 R11: 0000000000000246 R12: 0000000000000002


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