======================================
| [ 11.781468][ T277] #0: ffffffffa1a01dc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 11.781771][ T277] #1: ffffffffa19f0a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   11.782102][  T277]
| [   11.782102][  T277] stack backtrace:
[   11.782544][  T277] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.782755][  T277] Call Trace:
[   11.782902][  T277]  <TASK>
[ 11.783022][ T277] dump_stack_lvl (lib/dump_stack.c:123)
[ 11.783200][ T277] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 11.783363][ T277] validate_chain (kernel/locking/lockdep.c:3894)
[ 11.783514][ T277] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 11.783691][ T277] ? 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)
[ 11.783850][ T277] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.783967][ T277] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.784126][ T277] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 11.784274][ T277] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.784483][ T277] ? __kasan_slab_free (mm/kasan/common.c:271)
[ 11.784638][ T277] ? kmem_cache_free (mm/slub.c:4613 mm/slub.c:4715)
[ 11.784795][ T277] ? remove_proc_entry (fs/proc/generic.c:686)
[ 11.784949][ T277] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.785097][ T277] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 11.785244][ T277] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 11.785390][ T277] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.785585][ T277] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 11.785709][ T277] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.785898][ T277] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 11.786055][ T277] ? __debug_check_no_obj_freed (lib/debugobjects.c:1110)
[ 11.786253][ T277] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.786410][ T277] __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))
[ 11.786571][ T277] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 11.786728][ T277] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 11.786932][ T277] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 11.787116][ T277] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 11.787298][ T277] ? remove_proc_entry (fs/proc/generic.c:686)
[ 11.787450][ T277] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.787597][ T277] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.787785][ T277] macvlan_device_event (drivers/net/macvlan.c:1829 (discriminator 3))
[ 11.787944][ T277] ? __pfx_macvlan_device_event (drivers/net/macvlan.c:1779)
[ 11.788122][ T277] ? bond_remove_proc_entry (drivers/net/bonding/bond_procfs.c:307)
[ 11.788296][ T277] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 11.788466][ T277] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 11.788633][ T277] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 11.788848][ T277] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 11.789058][ T277] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[ 11.789219][ T277] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 11.789382][ T277] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 11.789574][ T277] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 11.789773][ T277] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 11.790002][ T277] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 11.790188][ T277] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 11.790359][ T277] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 11.790535][ T277] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 11.790709][ T277] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.790890][ T277] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.791061][ T277] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 11.791211][ T277] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.791369][ T277] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.791519][ T277] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 11.791672][ T277] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 11.791859][ T277] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 11.792005][ T277] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 11.792152][ T277] ? 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)
[ 11.792301][ T277] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.792412][ T277] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.792556][ T277] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 11.792703][ T277] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 11.792850][ T277] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 11.792996][ T277] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 11.793140][ T277] ? 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)
[ 11.793303][ T277] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 11.793448][ T277] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 11.793593][ T277] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.793744][ T277] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 11.793906][ T277] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 11.794061][ T277] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 11.794210][ T277] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 11.794358][ T277] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 11.794543][ T277] ___sys_sendmsg (net/socket.c:2650)
[ 11.794695][ T277] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 11.794863][ T277] ? kasan_save_stack (mm/kasan/common.c:49)
[ 11.795009][ T277] ? kasan_save_stack (mm/kasan/common.c:48)
[ 11.795156][ T277] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 11.795300][ T277] ? __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)
[ 11.795480][ T277] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 11.795630][ T277] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.795788][ T277] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 11.795978][ T277] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.796126][ T277] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.796270][ T277] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.796413][ T277] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 11.796559][ T277] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.796703][ T277] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.796851][ T277] __sys_sendmsg (net/socket.c:2680)
[ 11.797000][ T277] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 11.797142][ T277] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 11.797329][ T277] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.797475][ T277] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   11.797659][  T277] RIP: 0033:0x7f3358b539a7
[ 11.797817][ T277] 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)
[   11.798572][  T277] RSP: 002b:00007ffcd918ba38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   11.798935][  T277] RAX: ffffffffffffffda RBX: 00007ffcd918c160 RCX: 00007f3358b539a7
[   11.799293][  T277] RDX: 0000000000000000 RSI: 00007ffcd918baa0 RDI: 0000000000000005
[   11.799653][  T277] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   11.800002][  T277] R10: 00007f3358a11ef8 R11: 0000000000000246 R12: 0000000000000001


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