======================================
| [1328.948187][T17309] #0: ffffffffb63e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512)
| [1328.948477][T17309] #1: ffffffffb63d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [ 1328.948785][T17309]
| [ 1328.948785][T17309] stack backtrace:
[ 1328.949199][T17309] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1328.949394][T17309] Call Trace:
[ 1328.949508][T17309]  <TASK>
[1328.949586][T17309] dump_stack_lvl (lib/dump_stack.c:123)
[1328.949739][T17309] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[1328.949888][T17309] validate_chain (kernel/locking/lockdep.c:3894)
[1328.950037][T17309] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[1328.950193][T17309] ? 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)
[1328.950353][T17309] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[1328.950487][T17309] __lock_acquire (kernel/locking/lockdep.c:5226)
[1328.950637][T17309] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[1328.950782][T17309] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.950965][T17309] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[1328.951148][T17309] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[1328.951307][T17309] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[1328.951459][T17309] ? lock_acquire (kernel/locking/lockdep.c:5822)
[1328.951604][T17309] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.951785][T17309] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[1328.951897][T17309] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.952081][T17309] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[1328.952227][T17309] ? __lock_release (kernel/locking/lockdep.c:5525)
[1328.952388][T17309] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[1328.952539][T17309] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[1328.952688][T17309] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[1328.952831][T17309] __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))
[1328.952977][T17309] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[1328.953161][T17309] ? __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)
[1328.953357][T17309] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[1328.953651][T17309] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[1328.953889][T17309] netdev_upper_dev_unlink (net/core/dev.c:8190)
[1328.954127][T17309] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[1328.954409][T17309] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[1328.954642][T17309] ? 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)
[1328.954855][T17309] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[1328.955007][T17309] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[1328.955200][T17309] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[1328.955352][T17309] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[1328.955500][T17309] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[1328.955649][T17309] unregister_netdevice_many_notify (net/core/dev.c:11571)
[1328.955836][T17309] ? 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)
[1328.955982][T17309] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[1328.956095][T17309] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512)
[1328.956280][T17309] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[1328.956463][T17309] ? kfree (mm/slub.c:4613 mm/slub.c:4761)
[1328.956575][T17309] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[1328.956728][T17309] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[1328.956877][T17309] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518)
[1328.957024][T17309] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[1328.957186][T17309] ? find_held_lock (kernel/locking/lockdep.c:5339)
[1328.957333][T17309] ? __lock_release (kernel/locking/lockdep.c:5525)
[1328.957483][T17309] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[1328.957629][T17309] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[1328.957773][T17309] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[1328.957920][T17309] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[1328.958068][T17309] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[1328.958215][T17309] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902)
[1328.958360][T17309] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[1328.958510][T17309] ? 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)
[1328.958654][T17309] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[1328.958765][T17309] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[1328.958913][T17309] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[1328.959059][T17309] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[1328.959205][T17309] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[1328.959354][T17309] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[1328.959505][T17309] ? 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)
[1328.959652][T17309] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[1328.959798][T17309] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[1328.959942][T17309] ? find_held_lock (kernel/locking/lockdep.c:5339)
[1328.960090][T17309] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[1328.960236][T17309] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[1328.960385][T17309] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[1328.960548][T17309] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[1328.960692][T17309] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[1328.960877][T17309] ___sys_sendmsg (net/socket.c:2650)
[1328.961022][T17309] ? __pfx____sys_sendmsg (net/socket.c:2637)
[1328.961167][T17309] ? kasan_save_stack (mm/kasan/common.c:49)
[1328.961310][T17309] ? kasan_save_stack (mm/kasan/common.c:48)
[1328.961457][T17309] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[1328.961610][T17309] ? __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)
[1328.961792][T17309] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[1328.961935][T17309] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[1328.962081][T17309] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[1328.962262][T17309] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[1328.962409][T17309] ? find_held_lock (kernel/locking/lockdep.c:5339)
[1328.962576][T17309] ? __lock_release (kernel/locking/lockdep.c:5525)
[1328.962725][T17309] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[1328.962878][T17309] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[1328.963022][T17309] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[1328.963170][T17309] __sys_sendmsg (net/socket.c:2680)
[1328.963319][T17309] ? __pfx___sys_sendmsg (net/socket.c:2665)
[1328.963471][T17309] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[1328.963660][T17309] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[1328.963813][T17309] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1328.963993][T17309] RIP: 0033:0x7fb11c1fd9a7
[ 1328.964148][T17309] 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)
[ 1328.964667][T17309] RSP: 002b:00007ffed169bbe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1328.964898][T17309] RAX: ffffffffffffffda RBX: 00007ffed169c310 RCX: 00007fb11c1fd9a7
[ 1328.965121][T17309] RDX: 0000000000000000 RSI: 00007ffed169bc50 RDI: 0000000000000005
[ 1328.965340][T17309] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1328.965557][T17309] R10: 00007fb11c0bbef8 R11: 0000000000000246 R12: 0000000000000002


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