======================================
| [ 45.436661][ T659] #0: ffffffff89de7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 45.436957][ T659] #1: ffffffff89dd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   45.437281][  T659]
| [   45.437281][  T659] stack backtrace:
[   45.437724][  T659] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   45.437920][  T659] Call Trace:
[   45.438045][  T659]  <TASK>
[ 45.438128][ T659] dump_stack_lvl (lib/dump_stack.c:123)
[ 45.438293][ T659] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 45.438455][ T659] validate_chain (kernel/locking/lockdep.c:3894)
[ 45.438618][ T659] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 45.438781][ T659] ? 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)
[ 45.438941][ T659] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 45.439064][ T659] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 45.439228][ T659] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 45.439392][ T659] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.439590][ T659] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 45.439797][ T659] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 45.439959][ T659] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 45.440122][ T659] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 45.440282][ T659] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.440486][ T659] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 45.440608][ T659] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.440809][ T659] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 45.440972][ T659] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 45.441135][ T659] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 45.441298][ T659] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.441463][ T659] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.441629][ T659] __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))
[ 45.441792][ T659] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 45.441993][ T659] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:913)
[ 45.442153][ T659] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 45.442357][ T659] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 45.442521][ T659] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 45.442683][ T659] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 45.442912][ T659] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 45.443090][ T659] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.h:47 kernel/locking/mutex.c:66)
[ 45.443255][ T659] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 45.443414][ T659] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 45.443619][ T659] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 45.443786][ T659] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 45.443950][ T659] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 45.444116][ T659] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 45.444318][ T659] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 45.444520][ T659] ? net_generic (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48) ip6_gre
[ 45.444687][ T659] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.444850][ T659] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 45.445013][ T659] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 45.445179][ T659] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 45.445383][ T659] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 45.445583][ T659] ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[ 45.445746][ T659] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 45.445911][ T659] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 45.446085][ T659] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 45.446247][ T659] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 45.446413][ T659] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 45.446574][ T659] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.446737][ T659] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 45.446897][ T659] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 45.447060][ T659] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 45.447224][ T659] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 45.447385][ T659] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 45.447549][ T659] ? 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)
[ 45.447712][ T659] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 45.447835][ T659] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 45.447999][ T659] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 45.448160][ T659] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 45.448319][ T659] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 45.448484][ T659] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 45.448651][ T659] ? 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)
[ 45.448811][ T659] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 45.448985][ T659] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 45.449147][ T659] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 45.449310][ T659] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 45.449477][ T659] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 45.449642][ T659] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 45.449810][ T659] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 45.449973][ T659] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 45.450195][ T659] ___sys_sendmsg (net/socket.c:2650)
[ 45.450359][ T659] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 45.450523][ T659] ? kasan_save_stack (mm/kasan/common.c:49)
[ 45.450689][ T659] ? kasan_save_stack (mm/kasan/common.c:48)
[ 45.450847][ T659] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 45.451014][ T659] ? __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)
[ 45.451223][ T659] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 45.451385][ T659] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 45.451544][ T659] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 45.451743][ T659] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 45.451909][ T659] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 45.452072][ T659] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 45.452233][ T659] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 45.452402][ T659] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.452563][ T659] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 45.452725][ T659] __sys_sendmsg (net/socket.c:2680)
[ 45.452921][ T659] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 45.453081][ T659] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 45.453285][ T659] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 45.453452][ T659] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   45.453658][  T659] RIP: 0033:0x7ff7257159a7
[ 45.453830][ T659] 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)
[   45.454411][  T659] RSP: 002b:00007fff586b9798 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   45.454657][  T659] RAX: ffffffffffffffda RBX: 00007fff586b9ec0 RCX: 00007ff7257159a7
[   45.454900][  T659] RDX: 0000000000000000 RSI: 00007fff586b9800 RDI: 0000000000000005
[   45.455141][  T659] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   45.455380][  T659] R10: 00007ff7255d3ef8 R11: 0000000000000246 R12: 0000000000000002


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