======================================
| [ 32.753460][ T356] #0: ffffffffa4c01dc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 32.753729][ T356] #1: ffffffffa4bf0a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   32.754024][  T356]
| [   32.754024][  T356] stack backtrace:
[   32.754423][  T356] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.754608][  T356] Call Trace:
[   32.754727][  T356]  <TASK>
[ 32.754810][ T356] dump_stack_lvl (lib/dump_stack.c:123)
[ 32.754961][ T356] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 32.755117][ T356] validate_chain (kernel/locking/lockdep.c:3894)
[ 32.755265][ T356] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 32.755416][ T356] ? 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)
[ 32.755565][ T356] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 32.755679][ T356] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 32.755829][ T356] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 32.755976][ T356] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 32.756156][ T356] ? __kasan_slab_free (mm/kasan/common.c:271)
[ 32.756305][ T356] ? kmem_cache_free (mm/slub.c:4613 mm/slub.c:4715)
[ 32.756455][ T356] ? remove_proc_entry (fs/proc/generic.c:686)
[ 32.756612][ T356] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 32.756758][ T356] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 32.756911][ T356] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 32.757059][ T356] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 32.757241][ T356] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 32.757354][ T356] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 32.757535][ T356] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 32.757704][ T356] ? __debug_check_no_obj_freed (lib/debugobjects.c:1110)
[ 32.757891][ T356] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 32.758042][ T356] __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))
[ 32.758191][ T356] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 32.758341][ T356] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 32.758520][ T356] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 32.758701][ T356] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 32.758882][ T356] ? remove_proc_entry (fs/proc/generic.c:686)
[ 32.759033][ T356] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 32.759180][ T356] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 32.759361][ T356] macvlan_device_event (drivers/net/macvlan.c:1829 (discriminator 3))
[ 32.759513][ T356] ? __pfx_macvlan_device_event (drivers/net/macvlan.c:1779)
[ 32.759661][ T356] ? bond_remove_proc_entry (drivers/net/bonding/bond_procfs.c:307)
[ 32.759811][ T356] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 32.759962][ T356] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 32.760112][ T356] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 32.760297][ T356] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 32.760485][ T356] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[ 32.760631][ T356] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 32.760782][ T356] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 32.760930][ T356] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 32.761079][ T356] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 32.761270][ T356] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 32.761450][ T356] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 32.761601][ T356] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 32.761755][ T356] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 32.761921][ T356] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 32.762068][ T356] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 32.762213][ T356] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 32.762364][ T356] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 32.762516][ T356] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 32.762673][ T356] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 32.762820][ T356] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 32.762964][ T356] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 32.763114][ T356] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 32.763268][ T356] ? 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)
[ 32.763413][ T356] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 32.763528][ T356] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 32.763675][ T356] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 32.763822][ T356] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 32.763967][ T356] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 32.764117][ T356] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 32.764262][ T356] ? 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)
[ 32.764409][ T356] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 32.764554][ T356] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 32.764700][ T356] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 32.764845][ T356] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 32.764990][ T356] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 32.765137][ T356] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 32.765283][ T356] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 32.765431][ T356] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 32.765611][ T356] ? 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)
[ 32.765755][ T356] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 32.765902][ T356] ___sys_sendmsg (net/socket.c:2650)
[ 32.766045][ T356] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 32.766188][ T356] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 32.766336][ T356] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 32.766484][ T356] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 32.766629][ T356] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[ 32.766776][ T356] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 32.766922][ T356] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 32.767068][ T356] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 32.767212][ T356] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 32.767362][ T356] ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 37))
[ 32.767513][ T356] __sys_sendmsg (net/socket.c:2680)
[ 32.767671][ T356] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 32.767830][ T356] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 32.767979][ T356] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   32.768160][  T356] RIP: 0033:0x7f99401a39a7
[ 32.768317][ T356] 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)
[   32.768833][  T356] RSP: 002b:00007ffd99fd1c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   32.769055][  T356] RAX: ffffffffffffffda RBX: 00007ffd99fd23b0 RCX: 00007f99401a39a7
[   32.769275][  T356] RDX: 0000000000000000 RSI: 00007ffd99fd1ce0 RDI: 0000000000000005
[   32.769495][  T356] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   32.769716][  T356] R10: 00007f99400614a8 R11: 0000000000000246 R12: 0000000000000001


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