======================================
| [ 11.879673][ T266] #0: ffffffffb8601dc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512)
| [ 11.880095][ T266] #1: ffffffffb85f0a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   11.880569][  T266]
| [   11.880569][  T266] stack backtrace:
[   11.881185][  T266] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.881467][  T266] Call Trace:
[   11.881643][  T266]  <TASK>
[ 11.881766][ T266] dump_stack_lvl (lib/dump_stack.c:123)
[ 11.882005][ T266] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 11.882230][ T266] validate_chain (kernel/locking/lockdep.c:3894)
[ 11.882463][ T266] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 11.882697][ T266] ? 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)
[ 11.882926][ T266] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.883103][ T266] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.883338][ T266] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 11.883563][ T266] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.883850][ T266] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.884080][ T266] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 11.884312][ T266] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 11.884546][ T266] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.884828][ T266] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 11.885001][ T266] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.885279][ T266] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 11.885509][ T266] ? 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)
[ 11.885735][ T266] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 11.885961][ T266] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 11.886188][ T266] __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))
[ 11.886419][ T266] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.886635][ T266] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 11.886901][ T266] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.887122][ T266] ? unregister_netdevice_queue (net/core/dev.c:11497)
[ 11.887400][ T266] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496)
[ 11.887670][ T266] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.887889][ T266] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 11.888157][ T266] macvlan_device_event (drivers/net/macvlan.c:1829 (discriminator 3))
[ 11.888375][ T266] ? __pfx_macvlan_device_event (drivers/net/macvlan.c:1779)
[ 11.888600][ T266] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1))
[ 11.888814][ T266] ? ipmr_device_event (net/ipv4/ipmr.c:1781)
[ 11.889042][ T266] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 11.889273][ T266] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 11.889507][ T266] unregister_netdevice_many_notify (net/core/dev.c:11571)
[ 11.889795][ T266] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512)
[ 11.890069][ T266] ? rtnl_dellink (net/core/rtnetlink.c:3512)
[ 11.890282][ T266] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 11.890500][ T266] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 11.890730][ T266] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 11.890951][ T266] ? unregister_netdevice_queue (net/core/dev.c:11497)
[ 11.891224][ T266] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496)
[ 11.891495][ T266] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 11.891727][ T266] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518)
[ 11.891963][ T266] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 11.892218][ T266] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.892437][ T266] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.892662][ T266] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 11.892885][ T266] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.893097][ T266] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.893306][ T266] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 11.893507][ T266] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 11.893717][ T266] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902)
[ 11.893929][ T266] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 11.894145][ T266] ? 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)
[ 11.894364][ T266] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 11.894537][ T266] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.894762][ T266] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 11.894990][ T266] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 11.895219][ T266] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 11.895453][ T266] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 11.895680][ T266] ? 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)
[ 11.895911][ T266] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 11.896133][ T266] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 11.896356][ T266] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.896577][ T266] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 11.896801][ T266] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 11.897038][ T266] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 11.897276][ T266] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 11.897506][ T266] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 11.897787][ T266] ___sys_sendmsg (net/socket.c:2650)
[ 11.898010][ T266] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 11.898282][ T266] ? kasan_save_stack (mm/kasan/common.c:49)
[ 11.898510][ T266] ? kasan_save_stack (mm/kasan/common.c:48)
[ 11.898735][ T266] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 11.898955][ T266] ? __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)
[ 11.899245][ T266] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 11.899467][ T266] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.899692][ T266] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 11.899991][ T266] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 11.900227][ T266] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 11.900458][ T266] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 11.900686][ T266] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 11.900913][ T266] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 11.901131][ T266] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 11.901356][ T266] __sys_sendmsg (net/socket.c:2680)
[ 11.901589][ T266] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 11.901812][ T266] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 11.902101][ T266] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 11.902329][ T266] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   11.902605][  T266] RIP: 0033:0x7f4f8c3259a7
[ 11.902838][ T266] 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)
[   11.903603][  T266] RSP: 002b:00007ffd5833b828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   11.903945][  T266] RAX: ffffffffffffffda RBX: 00007ffd5833bf50 RCX: 00007f4f8c3259a7
[   11.904287][  T266] RDX: 0000000000000000 RSI: 00007ffd5833b890 RDI: 0000000000000005
[   11.904631][  T266] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   11.904966][  T266] R10: 00007f4f8c1e3ef8 R11: 0000000000000246 R12: 0000000000000001


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