======================================
| [ 62.213031][ T618] #0: ffffffffb73e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020)
| [ 62.213302][ T618] #1: ffffffffb73d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   62.213600][  T618]
| [   62.213600][  T618] stack backtrace:
[   62.214016][  T618] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   62.214205][  T618] Call Trace:
[   62.214323][  T618]  <TASK>
[ 62.214404][ T618] dump_stack_lvl (lib/dump_stack.c:123)
[ 62.214563][ T618] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 62.214714][ T618] validate_chain (kernel/locking/lockdep.c:3894)
[ 62.214870][ T618] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 62.215025][ T618] ? 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)
[ 62.215179][ T618] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 62.215294][ T618] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 62.215448][ T618] ? validate_chain (kernel/locking/lockdep.c:3798 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872)
[ 62.215599][ T618] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 62.215750][ T618] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 62.215938][ T618] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 62.216087][ T618] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 62.216251][ T618] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 62.216401][ T618] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 62.216589][ T618] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 62.216704][ T618] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 62.216893][ T618] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 62.217047][ T618] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 62.217199][ T618] dev_set_mtu_ext (./include/linux/notifier.h:207 net/core/dev.c:9101)
[ 62.217351][ T618] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 62.217510][ T618] ? __pfx_dev_set_mtu_ext (net/core/dev.c:9087)
[ 62.217660][ T618] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 62.217812][ T618] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 62.217963][ T618] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 62.218077][ T618] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 62.218227][ T618] dev_set_mtu (net/core/dev.c:9130)
[ 62.218340][ T618] ? __pfx_dev_set_mtu (net/core/dev.c:9125)
[ 62.218500][ T618] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34))
[ 62.218659][ T618] vlan_device_event (net/8021q/vlan.c:424) 8021q
[ 62.218820][ T618] ? __pfx_vlan_device_event (net/8021q/vlan.c:362) 8021q
[ 62.219008][ T618] ? __pfx_br_device_event (net/bridge/br.c:29) bridge
[ 62.219243][ T618] ? packet_notifier (net/packet/af_packet.c:4282)
[ 62.219397][ T618] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 62.219551][ T618] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 62.219710][ T618] dev_set_mtu_ext (./include/linux/notifier.h:207 net/core/dev.c:9111)
[ 62.219862][ T618] ? __pfx_dev_set_mtu_ext (net/core/dev.c:9087)
[ 62.220013][ T618] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83)
[ 62.220200][ T618] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 62.220350][ T618] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 62.220467][ T618] do_setlink.constprop.0 (net/core/rtnetlink.c:3081)
[ 62.220648][ T618] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:2999)
[ 62.220842][ T618] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 62.220993][ T618] ? rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020)
[ 62.221145][ T618] ? rtnl_newlink (./include/linux/slab.h:901 net/core/rtnetlink.c:3921)
[ 62.221295][ T618] ? rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 62.221445][ T618] ? __mutex_trylock_common (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4296 ./include/linux/atomic/atomic-long.h:1482 ./include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:104)
[ 62.221596][ T618] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 62.221782][ T618] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 62.221941][ T618] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 37))
[ 62.222094][ T618] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:595 kernel/locking/mutex.c:735)
[ 62.222250][ T618] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 62.222403][ T618] ? rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020)
[ 62.222553][ T618] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 62.222706][ T618] ? __rtnl_newlink (net/core/rtnetlink.c:3871)
[ 62.222859][ T618] rtnl_newlink (net/core/rtnetlink.c:345 net/core/rtnetlink.c:4022)
[ 62.223018][ T618] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3912)
[ 62.223167][ T618] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 62.223321][ T618] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 62.223470][ T618] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 62.223623][ T618] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 62.223772][ T618] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3912)
[ 62.223921][ T618] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 62.224070][ T618] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 62.224228][ T618] ? 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)
[ 62.224377][ T618] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 62.224492][ T618] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 62.224641][ T618] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 62.224791][ T618] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 62.224943][ T618] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 62.225098][ T618] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 62.225262][ T618] ? 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)
[ 62.225414][ T618] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 62.225567][ T618] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 62.225714][ T618] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 62.225866][ T618] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 62.226015][ T618] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 62.226171][ T618] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 62.226325][ T618] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 62.226474][ T618] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 62.226665][ T618] ___sys_sendmsg (net/socket.c:2650)
[ 62.226816][ T618] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 62.226966][ T618] ? kasan_save_stack (mm/kasan/common.c:49)
[ 62.227118][ T618] ? kasan_save_stack (mm/kasan/common.c:48)
[ 62.227266][ T618] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 62.227426][ T618] ? __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)
[ 62.227614][ T618] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 62.227763][ T618] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 62.227914][ T618] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 62.228103][ T618] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 62.228254][ T618] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 62.228402][ T618] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 62.228556][ T618] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 62.228716][ T618] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 62.228865][ T618] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 62.229015][ T618] __sys_sendmsg (net/socket.c:2680)
[ 62.229166][ T618] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 62.229316][ T618] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 62.229509][ T618] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 62.229670][ T618] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   62.229859][  T618] RIP: 0033:0x7f5a93cb69a7
[ 62.230018][ T618] 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)
[   62.230560][  T618] RSP: 002b:00007ffcfa6ede98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   62.230803][  T618] RAX: ffffffffffffffda RBX: 00007ffcfa6ee5c0 RCX: 00007f5a93cb69a7
[   62.231032][  T618] RDX: 0000000000000000 RSI: 00007ffcfa6edf00 RDI: 0000000000000005
[   62.231260][  T618] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000078
[   62.231488][  T618] R10: 00007f5a93b74ef8 R11: 0000000000000246 R12: 0000000000000004


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