======================================
| [ 61.220915][ T587] #0: ffffffff9cbe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 61.221221][ T587] #1: ffffffff9cbd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   61.221574][  T587]
| [   61.221574][  T587] stack backtrace:
[   61.222043][  T587] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   61.222253][  T587] Call Trace:
[   61.222387][  T587]  <TASK>
[ 61.222479][ T587] dump_stack_lvl (lib/dump_stack.c:123)
[ 61.222654][ T587] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 61.222825][ T587] validate_chain (kernel/locking/lockdep.c:3894)
[ 61.222996][ T587] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 61.223178][ T587] ? 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)
[ 61.223352][ T587] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 61.223483][ T587] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 61.223661][ T587] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 61.223834][ T587] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 61.224050][ T587] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 61.224264][ T587] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 61.224444][ T587] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 61.224617][ T587] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 61.224786][ T587] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 61.225010][ T587] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 61.225143][ T587] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 61.225356][ T587] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 61.225527][ T587] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 61.225699][ T587] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 61.225871][ T587] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 61.226045][ T587] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 61.226224][ T587] __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))
[ 61.226398][ T587] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 61.226610][ T587] ? __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)
[ 61.226782][ T587] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 61.227005][ T587] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 61.227182][ T587] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 61.227352][ T587] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 61.227574][ T587] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 61.227744][ T587] ? 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)
[ 61.227939][ T587] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 61.228109][ T587] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 61.228331][ T587] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 61.228509][ T587] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 61.228684][ T587] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 61.228860][ T587] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 61.229086][ T587] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 61.229302][ T587] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[ 61.229479][ T587] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 61.229657][ T587] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 61.229830][ T587] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 61.230005][ T587] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 61.230220][ T587] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 61.230437][ T587] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 61.230612][ T587] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 61.230793][ T587] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 61.230984][ T587] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 61.231159][ T587] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 61.231329][ T587] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 61.231503][ T587] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 61.231676][ T587] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 61.231852][ T587] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 61.232025][ T587] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 61.232191][ T587] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 61.232357][ T587] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 61.232530][ T587] ? 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)
[ 61.232700][ T587] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 61.232831][ T587] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 61.233003][ T587] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 61.233183][ T587] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 61.233374][ T587] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 61.233554][ T587] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 61.233728][ T587] ? 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)
[ 61.233905][ T587] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 61.234080][ T587] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 61.234250][ T587] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 61.234417][ T587] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 61.234594][ T587] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 61.234773][ T587] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 61.234945][ T587] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 61.235114][ T587] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 61.235333][ T587] ? 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)
[ 61.235509][ T587] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 61.235682][ T587] ___sys_sendmsg (net/socket.c:2650)
[ 61.235862][ T587] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 61.236034][ T587] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 61.236210][ T587] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 61.236378][ T587] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 61.236556][ T587] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[ 61.236731][ T587] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 61.236903][ T587] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 61.237082][ T587] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 61.237255][ T587] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 61.237450][ T587] ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 37))
[ 61.237630][ T587] __sys_sendmsg (net/socket.c:2680)
[ 61.237803][ T587] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 61.237978][ T587] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 61.238150][ T587] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   61.238365][  T587] RIP: 0033:0x7f1515cde9a7
[ 61.238551][ T587] 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)
[   61.239158][  T587] RSP: 002b:00007fff6250b0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   61.239422][  T587] RAX: ffffffffffffffda RBX: 00007fff6250b7f0 RCX: 00007f1515cde9a7
[   61.239686][  T587] RDX: 0000000000000000 RSI: 00007fff6250b130 RDI: 0000000000000005
[   61.239942][  T587] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   61.240202][  T587] R10: 00007f1515b9cef8 R11: 0000000000000246 R12: 0000000000000002


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