======================================
| [ 11.919704][ T276] #0: ffffffffb4c01dc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512)
| [ 11.920043][ T276] #1: ffffffffb4bf0a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   11.920416][  T276]
| [   11.920416][  T276] stack backtrace:
[   11.920950][  T276] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.921181][  T276] Call Trace:
[   11.921306][  T276]  <TASK>
[ 11.921401][ T276] dump_stack_lvl (lib/dump_stack.c:123)
[ 11.921608][ T276] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 11.921781][ T276] validate_chain (kernel/locking/lockdep.c:3894)
[ 11.921993][ T276] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 11.922158][ 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)
[ 11.922367][ T276] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.922493][ T276] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.922680][ T276] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 11.922879][ T276] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.923084][ T276] ? __kasan_slab_free (mm/kasan/common.c:271)
[ 11.923300][ T276] ? kmem_cache_free (mm/slub.c:4613 mm/slub.c:4715)
[ 11.923464][ T276] ? remove_proc_entry (fs/proc/generic.c:686)
[ 11.923646][ T276] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.923839][ T276] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 11.924013][ T276] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 11.924177][ T276] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.924426][ 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)
[ 11.924592][ T276] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.924830][ T276] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 11.925031][ T276] ? __debug_check_no_obj_freed (lib/debugobjects.c:1110)
[ 11.925268][ T276] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.925478][ 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))
[ 11.925659][ T276] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 11.925855][ T276] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 11.926071][ T276] ? unregister_netdevice_queue (net/core/dev.c:11497)
[ 11.926271][ T276] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496)
[ 11.926472][ T276] ? remove_proc_entry (fs/proc/generic.c:686)
[ 11.926632][ T276] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.926789][ T276] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.926999][ T276] macvlan_device_event (drivers/net/macvlan.c:1829 (discriminator 3))
[ 11.927168][ T276] ? __pfx_macvlan_device_event (drivers/net/macvlan.c:1779)
[ 11.927329][ T276] ? bond_remove_proc_entry (drivers/net/bonding/bond_procfs.c:307)
[ 11.927492][ T276] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 11.927654][ T276] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 11.927812][ T276] unregister_netdevice_many_notify (net/core/dev.c:11571)
[ 11.928107][ T276] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512)
[ 11.928359][ T276] ? rtnl_dellink (net/core/rtnetlink.c:3512)
[ 11.928562][ T276] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 11.928762][ T276] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 11.928982][ T276] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 11.929149][ T276] ? unregister_netdevice_queue (net/core/dev.c:11497)
[ 11.929348][ T276] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496)
[ 11.929548][ T276] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 11.929711][ T276] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518)
[ 11.929881][ T276] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 11.930055][ T276] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.930218][ T276] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.930375][ T276] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 11.930536][ T276] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.930694][ T276] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.930856][ T276] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 11.931037][ T276] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 11.931196][ T276] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902)
[ 11.931359][ T276] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 11.931519][ 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)
[ 11.931677][ T276] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.931800][ T276] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.931964][ T276] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 11.932126][ T276] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 11.932287][ T276] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 11.932454][ T276] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 11.932615][ 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)
[ 11.932776][ T276] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 11.932946][ T276] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 11.933106][ T276] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.933267][ T276] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 11.933428][ T276] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 11.933591][ T276] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 11.933751][ T276] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 11.933921][ T276] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 11.934122][ T276] ___sys_sendmsg (net/socket.c:2650)
[ 11.934281][ T276] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 11.934445][ T276] ? kasan_save_stack (mm/kasan/common.c:49)
[ 11.934610][ T276] ? kasan_save_stack (mm/kasan/common.c:48)
[ 11.934777][ T276] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 11.934950][ 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)
[ 11.935148][ T276] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 11.935306][ T276] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.935464][ T276] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 11.935676][ T276] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.935837][ T276] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.936008][ T276] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.936165][ 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)
[ 11.936327][ T276] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.936487][ T276] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.936648][ T276] __sys_sendmsg (net/socket.c:2680)
[ 11.936808][ T276] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 11.936975][ T276] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 11.937186][ T276] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.937346][ T276] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   11.937544][  T276] RIP: 0033:0x7fccba32f9a7
[ 11.937711][ 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)
[   11.938409][  T276] RSP: 002b:00007ffff82654f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   11.938655][  T276] RAX: ffffffffffffffda RBX: 00007ffff8265c20 RCX: 00007fccba32f9a7
[   11.938907][  T276] RDX: 0000000000000000 RSI: 00007ffff8265560 RDI: 0000000000000005
[   11.939149][  T276] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   11.939392][  T276] R10: 00007fccba1edef8 R11: 0000000000000246 R12: 0000000000000001


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