======================================
| [ 39.655467][ T487] #0: ffffffff8ede7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512)
| [ 39.655734][ T487] #1: ffffffff8edd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   39.656040][  T487]
| [   39.656040][  T487] stack backtrace:
[   39.656448][  T487] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   39.656630][  T487] Call Trace:
[   39.656742][  T487]  <TASK>
[ 39.656822][ T487] dump_stack_lvl (lib/dump_stack.c:123)
[ 39.656979][ T487] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 39.657139][ T487] validate_chain (kernel/locking/lockdep.c:3894)
[ 39.657287][ T487] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 39.657444][ T487] ? 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)
[ 39.657590][ T487] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 39.657702][ T487] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 39.657852][ T487] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 39.658084][ T487] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 39.658381][ T487] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 39.658618][ T487] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 39.658856][ T487] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 39.659097][ T487] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 39.659329][ T487] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 39.659616][ T487] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 39.659793][ T487] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 39.660085][ T487] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 39.660313][ T487] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 39.660546][ T487] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 39.660797][ T487] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 39.661035][ T487] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 39.661276][ T487] __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))
[ 39.661517][ T487] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 39.661814][ T487] ? __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)
[ 39.662051][ T487] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 39.662350][ T487] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 39.662596][ T487] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 39.662834][ T487] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 39.663122][ T487] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 39.663363][ T487] ? 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)
[ 39.663599][ T487] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 39.663785][ T487] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 39.663999][ T487] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 39.664223][ T487] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 39.664377][ T487] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 39.664522][ T487] unregister_netdevice_many_notify (net/core/dev.c:11571)
[ 39.664707][ T487] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512)
[ 39.664886][ T487] ? rtnl_dellink (net/core/rtnetlink.c:3512)
[ 39.665052][ T487] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 39.665256][ T487] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 39.665421][ T487] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 39.665584][ T487] ? unregister_netdevice_queue (net/core/dev.c:11497)
[ 39.665782][ T487] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496)
[ 39.665981][ T487] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 39.666164][ T487] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518)
[ 39.666326][ T487] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 39.666506][ T487] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 39.666667][ T487] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 39.666829][ T487] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 39.666989][ T487] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 39.667162][ T487] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 39.667324][ T487] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 39.667484][ T487] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 39.667656][ T487] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902)
[ 39.667817][ T487] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 39.667977][ T487] ? 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)
[ 39.668194][ T487] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 39.668319][ T487] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 39.668482][ T487] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 39.668649][ T487] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 39.668818][ T487] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 39.668983][ T487] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 39.669151][ T487] ? 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)
[ 39.669315][ T487] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 39.669474][ T487] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 39.669638][ T487] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 39.669806][ T487] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 39.669977][ T487] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 39.670146][ T487] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 39.670314][ T487] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 39.670476][ T487] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 39.670684][ T487] ___sys_sendmsg (net/socket.c:2650)
[ 39.670847][ T487] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 39.671010][ T487] ? kasan_save_stack (mm/kasan/common.c:49)
[ 39.671179][ T487] ? kasan_save_stack (mm/kasan/common.c:48)
[ 39.671340][ T487] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 39.671501][ T487] ? __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)
[ 39.671701][ T487] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 39.671864][ T487] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 39.672025][ T487] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 39.672232][ T487] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 39.672394][ T487] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 39.672570][ T487] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 39.672732][ T487] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 39.672895][ T487] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 39.673056][ T487] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 39.673220][ T487] __sys_sendmsg (net/socket.c:2680)
[ 39.673380][ T487] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 39.673541][ T487] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 39.673755][ T487] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 39.673916][ T487] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   39.674123][  T487] RIP: 0033:0x7f327088c9a7
[ 39.674299][ T487] 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)
[   39.674874][  T487] RSP: 002b:00007ffe624f13c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   39.675120][  T487] RAX: ffffffffffffffda RBX: 00007ffe624f1af0 RCX: 00007f327088c9a7
[   39.675364][  T487] RDX: 0000000000000000 RSI: 00007ffe624f1430 RDI: 0000000000000005
[   39.675610][  T487] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   39.675856][  T487] R10: 00007f327074aef8 R11: 0000000000000246 R12: 0000000000000002


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