======================================
| [1328.211921][T17659] #0: ffffffffb27e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [1328.212215][T17659] #1: ffffffffb27d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [ 1328.212542][T17659]
| [ 1328.212542][T17659] stack backtrace:
[ 1328.212990][T17659] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1328.213190][T17659] Call Trace:
[ 1328.213314][T17659]  <TASK>
[1328.213399][T17659] dump_stack_lvl (lib/dump_stack.c:123)
[1328.213572][T17659] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[1328.213783][T17659] validate_chain (kernel/locking/lockdep.c:3894)
[1328.213994][T17659] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[1328.214200][T17659] ? 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)
[1328.214396][T17659] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[1328.214547][T17659] __lock_acquire (kernel/locking/lockdep.c:5226)
[1328.214779][T17659] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[1328.215034][T17659] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.215346][T17659] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[1328.215622][T17659] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[1328.215803][T17659] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[1328.216012][T17659] ? lock_acquire (kernel/locking/lockdep.c:5822)
[1328.216193][T17659] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.216397][T17659] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[1328.216524][T17659] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.216723][T17659] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[1328.216934][T17659] ? __lock_release (kernel/locking/lockdep.c:5525)
[1328.217122][T17659] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[1328.217330][T17659] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[1328.217493][T17659] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.217695][T17659] __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))
[1328.217907][T17659] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[1328.218230][T17659] ? __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)
[1328.218420][T17659] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[1328.218651][T17659] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[1328.218826][T17659] netdev_upper_dev_unlink (net/core/dev.c:8190)
[1328.219038][T17659] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[1328.219241][T17659] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[1328.219407][T17659] ? 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)
[1328.219606][T17659] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[1328.219791][T17659] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[1328.220008][T17659] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[1328.220176][T17659] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[1328.220340][T17659] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[1328.220511][T17659] unregister_netdevice_many_notify (net/core/dev.c:11575)
[1328.220781][T17659] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[1328.221026][T17659] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[1328.221193][T17659] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[1328.221410][T17659] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[1328.221617][T17659] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[1328.221825][T17659] ? unregister_netdevice_queue (net/core/dev.c:11501)
[1328.222084][T17659] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[1328.222283][T17659] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[1328.222508][T17659] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[1328.222671][T17659] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[1328.222847][T17659] ? find_held_lock (kernel/locking/lockdep.c:5339)
[1328.223025][T17659] ? __lock_release (kernel/locking/lockdep.c:5525)
[1328.223188][T17659] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[1328.223387][T17659] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[1328.223576][T17659] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[1328.223775][T17659] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[1328.223987][T17659] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[1328.224203][T17659] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[1328.224385][T17659] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[1328.224592][T17659] ? 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)
[1328.224753][T17659] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[1328.224926][T17659] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[1328.225104][T17659] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[1328.225264][T17659] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[1328.225425][T17659] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[1328.225586][T17659] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[1328.225797][T17659] ? 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)
[1328.225998][T17659] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[1328.226199][T17659] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[1328.226409][T17659] ? find_held_lock (kernel/locking/lockdep.c:5339)
[1328.226609][T17659] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[1328.226816][T17659] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[1328.227002][T17659] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[1328.227237][T17659] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[1328.227408][T17659] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[1328.227611][T17659] ___sys_sendmsg (net/socket.c:2650)
[1328.227781][T17659] ? __pfx____sys_sendmsg (net/socket.c:2637)
[1328.227991][T17659] ? kasan_save_stack (mm/kasan/common.c:49)
[1328.228218][T17659] ? kasan_save_stack (mm/kasan/common.c:48)
[1328.228420][T17659] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[1328.228621][T17659] ? __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)
[1328.228869][T17659] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[1328.229115][T17659] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[1328.229278][T17659] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[1328.229493][T17659] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[1328.229657][T17659] ? find_held_lock (kernel/locking/lockdep.c:5339)
[1328.229817][T17659] ? __lock_release (kernel/locking/lockdep.c:5525)
[1328.229985][T17659] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[1328.230151][T17659] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[1328.230312][T17659] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[1328.230473][T17659] __sys_sendmsg (net/socket.c:2680)
[1328.230646][T17659] ? __pfx___sys_sendmsg (net/socket.c:2665)
[1328.230837][T17659] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[1328.231084][T17659] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[1328.231245][T17659] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1328.231450][T17659] RIP: 0033:0x7f8e7be209a7
[ 1328.231625][T17659] 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)
[ 1328.232303][T17659] RSP: 002b:00007ffe9e50e918 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1328.232551][T17659] RAX: ffffffffffffffda RBX: 00007ffe9e50f040 RCX: 00007f8e7be209a7
[ 1328.232794][T17659] RDX: 0000000000000000 RSI: 00007ffe9e50e980 RDI: 0000000000000005
[ 1328.233105][T17659] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1328.233373][T17659] R10: 00007f8e7bcdeef8 R11: 0000000000000246 R12: 0000000000000002


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