======================================
| [ 11.854319][ T276] #0: ffffffffa6a01dc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 11.854619][ T276] #1: ffffffffa69f0a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   11.854998][  T276]
| [   11.854998][  T276] stack backtrace:
[   11.855490][  T276] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.855735][  T276] Call Trace:
[   11.855863][  T276]  <TASK>
[ 11.855948][ T276] dump_stack_lvl (lib/dump_stack.c:123)
[ 11.856139][ T276] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 11.856365][ T276] validate_chain (kernel/locking/lockdep.c:3894)
[ 11.856537][ T276] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 11.856760][ T276] ? 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)
[ 11.856928][ T276] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.857085][ T276] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.857281][ T276] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 11.857459][ T276] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.857720][ T276] ? __kasan_slab_free (mm/kasan/common.c:271)
[ 11.857889][ T276] ? kmem_cache_free (mm/slub.c:4613 mm/slub.c:4715)
[ 11.858095][ T276] ? remove_proc_entry (fs/proc/generic.c:686)
[ 11.858279][ T276] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.858448][ T276] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 11.858650][ T276] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 11.858827][ T276] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.859030][ T276] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 11.859176][ T276] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.859429][ T276] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 11.859595][ T276] ? __debug_check_no_obj_freed (lib/debugobjects.c:1110)
[ 11.859804][ T276] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.860020][ T276] __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))
[ 11.860214][ T276] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 11.860394][ T276] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 11.860641][ T276] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 11.860849][ T276] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 11.861111][ T276] ? remove_proc_entry (fs/proc/generic.c:686)
[ 11.861361][ T276] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.861562][ T276] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.861796][ T276] macvlan_device_event (drivers/net/macvlan.c:1829 (discriminator 3))
[ 11.861964][ T276] ? __pfx_macvlan_device_event (drivers/net/macvlan.c:1779)
[ 11.862142][ T276] ? bond_remove_proc_entry (drivers/net/bonding/bond_procfs.c:307)
[ 11.862331][ T276] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 11.862532][ T276] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 11.862706][ T276] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 11.862979][ T276] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 11.863191][ T276] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[ 11.863358][ T276] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 11.863524][ T276] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 11.863693][ T276] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 11.863906][ T276] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 11.864137][ T276] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 11.864402][ T276] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 11.864590][ T276] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 11.864759][ T276] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 11.864939][ T276] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.865115][ T276] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.865369][ T276] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 11.865554][ T276] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.865720][ T276] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.865887][ T276] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 11.866057][ T276] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 11.866229][ T276] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 11.866394][ T276] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 11.866561][ T276] ? 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)
[ 11.866734][ T276] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.866896][ T276] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.867111][ T276] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 11.867332][ T276] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 11.867566][ T276] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 11.867814][ T276] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 11.868069][ T276] ? 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)
[ 11.868320][ T276] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 11.868523][ T276] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 11.868692][ T276] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.868863][ T276] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 11.869066][ T276] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 11.869331][ T276] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 11.869538][ T276] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 11.869745][ T276] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 11.870033][ T276] ___sys_sendmsg (net/socket.c:2650)
[ 11.870280][ T276] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 11.870519][ T276] ? kasan_save_stack (mm/kasan/common.c:49)
[ 11.870771][ T276] ? kasan_save_stack (mm/kasan/common.c:48)
[ 11.871032][ T276] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 11.871285][ T276] ? __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)
[ 11.871599][ T276] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 11.871853][ T276] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.872062][ T276] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 11.872278][ T276] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.872448][ T276] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.872618][ T276] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.872785][ T276] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 11.872952][ T276] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.873135][ T276] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.873307][ T276] __sys_sendmsg (net/socket.c:2680)
[ 11.873472][ T276] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 11.873637][ T276] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 11.873854][ T276] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.874018][ T276] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   11.874277][  T276] RIP: 0033:0x7fe7822de9a7
[ 11.874452][ T276] 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)
[   11.875039][  T276] RSP: 002b:00007ffe01ca63e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   11.875300][  T276] RAX: ffffffffffffffda RBX: 00007ffe01ca6b10 RCX: 00007fe7822de9a7
[   11.875549][  T276] RDX: 0000000000000000 RSI: 00007ffe01ca6450 RDI: 0000000000000005
[   11.875796][  T276] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   11.876041][  T276] R10: 00007fe78219cef8 R11: 0000000000000246 R12: 0000000000000001


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