======================================
| [ 35.597579][ T355] #0: ffffffff93801dc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 35.597881][ T355] #1: ffffffff937f0a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   35.598229][  T355]
| [   35.598229][  T355] stack backtrace:
[   35.598698][  T355] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   35.598905][  T355] Call Trace:
[   35.599041][  T355]  <TASK>
[ 35.599128][ T355] dump_stack_lvl (lib/dump_stack.c:123)
[ 35.599293][ T355] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 35.599457][ T355] validate_chain (kernel/locking/lockdep.c:3894)
[ 35.599643][ T355] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 35.599810][ T355] ? 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)
[ 35.599974][ T355] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 35.600098][ T355] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 35.600267][ T355] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 35.600432][ T355] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 35.600660][ T355] ? __kasan_slab_free (mm/kasan/common.c:271)
[ 35.600824][ T355] ? kmem_cache_free (mm/slub.c:4613 mm/slub.c:4715)
[ 35.600994][ T355] ? remove_proc_entry (fs/proc/generic.c:686)
[ 35.601162][ T355] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 35.601337][ T355] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 35.601523][ T355] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 35.601679][ T355] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 35.601922][ T355] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 35.602099][ T355] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 35.602359][ T355] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 35.602525][ T355] ? __debug_check_no_obj_freed (lib/debugobjects.c:1110)
[ 35.602727][ T355] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 35.602913][ T355] __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))
[ 35.603074][ T355] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 35.603237][ T355] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 35.603464][ T355] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 35.603665][ T355] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 35.603895][ T355] ? remove_proc_entry (fs/proc/generic.c:686)
[ 35.604060][ T355] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 35.604241][ T355] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 35.604455][ T355] macvlan_device_event (drivers/net/macvlan.c:1829 (discriminator 3))
[ 35.604622][ T355] ? __pfx_macvlan_device_event (drivers/net/macvlan.c:1779)
[ 35.604794][ T355] ? bond_remove_proc_entry (drivers/net/bonding/bond_procfs.c:307)
[ 35.604961][ T355] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 35.605155][ T355] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 35.605320][ T355] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 35.605522][ T355] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 35.605719][ T355] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[ 35.605914][ T355] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 35.606077][ T355] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 35.606241][ T355] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 35.606405][ T355] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 35.606625][ T355] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 35.606858][ T355] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 35.607096][ T355] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 35.607258][ T355] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 35.607436][ T355] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 35.607596][ T355] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 35.607756][ T355] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 35.607939][ T355] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 35.608099][ T355] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 35.608274][ T355] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 35.608441][ T355] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 35.608613][ T355] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 35.608804][ T355] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 35.608958][ T355] ? 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)
[ 35.609119][ T355] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 35.609240][ T355] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 35.609403][ T355] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 35.609567][ T355] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 35.609728][ T355] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 35.609912][ T355] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 35.610095][ T355] ? 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)
[ 35.610256][ T355] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 35.610440][ T355] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 35.610613][ T355] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 35.610784][ T355] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 35.610954][ T355] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 35.611128][ T355] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 35.611290][ T355] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 35.611474][ T355] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 35.611679][ T355] ___sys_sendmsg (net/socket.c:2650)
[ 35.611850][ T355] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 35.612026][ T355] ? kasan_save_stack (mm/kasan/common.c:49)
[ 35.612192][ T355] ? kasan_save_stack (mm/kasan/common.c:48)
[ 35.612350][ T355] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 35.612517][ T355] ? __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)
[ 35.612736][ T355] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 35.612953][ T355] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 35.613117][ T355] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 35.613317][ T355] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 35.613481][ T355] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 35.613657][ T355] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 35.613826][ T355] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 35.613984][ T355] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 35.614129][ T355] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 35.614290][ T355] __sys_sendmsg (net/socket.c:2680)
[ 35.614452][ T355] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 35.614611][ T355] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 35.614811][ T355] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 35.614970][ T355] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   35.615164][  T355] RIP: 0033:0x7eff9a0299a7
[ 35.615335][ T355] 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)
[   35.615909][  T355] RSP: 002b:00007fff16bb4398 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   35.616163][  T355] RAX: ffffffffffffffda RBX: 00007fff16bb4ad0 RCX: 00007eff9a0299a7
[   35.616406][  T355] RDX: 0000000000000000 RSI: 00007fff16bb4400 RDI: 0000000000000005
[   35.616653][  T355] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   35.616913][  T355] R10: 00007eff99ee74a8 R11: 0000000000000246 R12: 0000000000000001


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