======================================
| [ 949.723312][ T4631] #0: ffffffffa8bdcac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 949.723634][ T4631] #1: ffff8880074d2c58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) 
| [  949.723950][ T4631]
| [  949.723950][ T4631] stack backtrace:
[  949.724425][ T4631] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  949.724800][ T4631] Call Trace:
[  949.724942][ T4631]  <TASK>
[ 949.725035][ T4631] dump_stack_lvl (lib/dump_stack.c:122) 
[ 949.725216][ T4631] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 949.725388][ T4631] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 949.725564][ T4631] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 949.725779][ T4631] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 949.725949][ T4631] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 949.726126][ T4631] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 949.726304][ T4631] br_make_forwarding (net/bridge/br_stp.c:465) 
[ 949.726484][ T4631] br_port_state_selection (net/bridge/br_stp.c:495) 
[ 949.726664][ T4631] br_stp_enable_port (net/bridge/br_stp_if.c:95) 
[ 949.726834][ T4631] br_add_if (net/bridge/br_if.c:687) 
[ 949.726968][ T4631] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 949.727137][ T4631] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 949.727360][ T4631] do_setlink (net/core/rtnetlink.c:2907) 
[ 949.727548][ T4631] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 949.727721][ T4631] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 949.727900][ T4631] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 949.728072][ T4631] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 949.728248][ T4631] ? __kernel_text_address (kernel/extable.c:79) 
[ 949.728418][ T4631] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 949.728589][ T4631] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 949.728805][ T4631] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 949.728990][ T4631] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 949.729162][ T4631] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 949.729337][ T4631] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 949.729514][ T4631] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 949.729649][ T4631] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 949.729824][ T4631] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 949.730004][ T4631] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 949.730183][ T4631] ? 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:227) 
[ 949.730360][ T4631] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 949.730537][ T4631] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 949.730759][ T4631] ? __create_object (mm/kmemleak.c:751) 
[ 949.730931][ T4631] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 949.731114][ T4631] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 949.731246][ T4631] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 949.731420][ T4631] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 949.731591][ T4631] ? 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:227) 
[ 949.731765][ T4631] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 949.731900][ T4631] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 949.732076][ T4631] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 949.732254][ T4631] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 949.732426][ T4631] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 949.732616][ T4631] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 949.732787][ T4631] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 949.732959][ T4631] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 949.733136][ T4631] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 949.733312][ T4631] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 949.733496][ T4631] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 949.733676][ T4631] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 949.733848][ T4631] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 949.734025][ T4631] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 949.734209][ T4631] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 949.734388][ T4631] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 949.734559][ T4631] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 949.734775][ T4631] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 949.734963][ T4631] ___sys_sendmsg (net/socket.c:2653) 
[ 949.735140][ T4631] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 949.735311][ T4631] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 949.735484][ T4631] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 949.735658][ T4631] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 949.735878][ T4631] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 949.736051][ T4631] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 949.736227][ T4631] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 949.736448][ T4631] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 949.736628][ T4631] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 949.736800][ T4631] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 949.736970][ T4631] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:94 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2034 arch/x86/mm/physaddr.c:65) 
[ 949.737165][ T4631] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 949.737339][ T4631] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  949.737557][ T4631] RIP: 0033:0x7f0fe3a657b7
[ 949.737736][ T4631] 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)
[  949.738346][ T4631] RSP: 002b:00007ffc0609ef18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  949.738604][ T4631] RAX: ffffffffffffffda RBX: 00007ffc0609f640 RCX: 00007f0fe3a657b7
[  949.738850][ T4631] RDX: 0000000000000000 RSI: 00007ffc0609ef80 RDI: 0000000000000005
[  949.739112][ T4631] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[  949.739370][ T4631] R10: 0000000009506910 R11: 0000000000000246 R12: 0000000000000003
[  949.739626][ T4631] R13: 0000000066be9e6c R14: 0000000000496600 R15: 0000000000000000
| [ 949.741999][ T4631] #0: ffffffffa8bdcac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 949.742281][ T4631] #1: ffff8880074d2c58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) 
| [  949.742561][ T4631]
| [  949.742561][ T4631] stack backtrace:
[  949.742994][ T4631] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  949.743433][ T4631] Call Trace:
[  949.743554][ T4631]  <TASK>
[ 949.743641][ T4631] dump_stack_lvl (lib/dump_stack.c:122) 
[ 949.743900][ T4631] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 949.744059][ T4631] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 949.744223][ T4631] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 949.744421][ T4631] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 949.744674][ T4631] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 949.744837][ T4631] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 949.745001][ T4631] br_make_forwarding (net/bridge/br_stp.c:465) 
[ 949.745161][ T4631] br_port_state_selection (net/bridge/br_stp.c:495) 
[ 949.745323][ T4631] br_stp_enable_port (net/bridge/br_stp_if.c:95) 
[ 949.745574][ T4631] br_add_if (net/bridge/br_if.c:687) 
[ 949.745701][ T4631] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 949.745858][ T4631] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 949.746060][ T4631] do_setlink (net/core/rtnetlink.c:2907) 
[ 949.746316][ T4631] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 949.746476][ T4631] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 949.746634][ T4631] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 949.746793][ T4631] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 949.747050][ T4631] ? __kernel_text_address (kernel/extable.c:79) 
[ 949.747207][ T4631] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 949.747365][ T4631] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 949.747573][ T4631] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 949.747843][ T4631] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 949.748002][ T4631] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 949.748160][ T4631] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 949.748317][ T4631] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 949.748444][ T4631] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 949.748610][ T4631] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 949.748800][ T4631] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 949.748965][ T4631] ? 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:227) 
[ 949.749133][ T4631] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 949.749389][ T4631] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 949.749587][ T4631] ? __create_object (mm/kmemleak.c:751) 
[ 949.749747][ T4631] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 949.749911][ T4631] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 949.750126][ T4631] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 949.750289][ T4631] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 949.750448][ T4631] ? 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:227) 
[ 949.750609][ T4631] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 949.750735][ T4631] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 949.751083][ T4631] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 949.751240][ T4631] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 949.751400][ T4631] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 949.751573][ T4631] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 949.751837][ T4631] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 949.751999][ T4631] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 949.752165][ T4631] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 949.752328][ T4631] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 949.752491][ T4631] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 949.752652][ T4631] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 949.752811][ T4631] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 949.752971][ T4631] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 949.753235][ T4631] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 949.753399][ T4631] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 949.753556][ T4631] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 949.753759][ T4631] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 949.754024][ T4631] ___sys_sendmsg (net/socket.c:2653) 
[ 949.754187][ T4631] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 949.754348][ T4631] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 949.754510][ T4631] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 949.754665][ T4631] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 949.754954][ T4631] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 949.755122][ T4631] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 949.755286][ T4631] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 949.755482][ T4631] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 949.755646][ T4631] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 949.755805][ T4631] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 949.755963][ T4631] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:94 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2034 arch/x86/mm/physaddr.c:65) 
[ 949.756144][ T4631] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 949.756400][ T4631] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  949.756605][ T4631] RIP: 0033:0x7f0fe3a657b7
[ 949.756769][ T4631] 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)
[  949.757417][ T4631] RSP: 002b:00007ffc0609ef18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  949.757667][ T4631] RAX: ffffffffffffffda RBX: 00007ffc0609f640 RCX: 00007f0fe3a657b7
[  949.758012][ T4631] RDX: 0000000000000000 RSI: 00007ffc0609ef80 RDI: 0000000000000005
[  949.758246][ T4631] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[  949.758490][ T4631] R10: 0000000009506910 R11: 0000000000000246 R12: 0000000000000003
[  949.758727][ T4631] R13: 0000000066be9e6c R14: 0000000000496600 R15: 0000000000000000
| [ 949.761053][ T4631] #0: ffffffffa8bdcac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 949.761339][ T4631] #1: ffff8880074d2c58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) 
| [  949.761723][ T4631]
| [  949.761723][ T4631] stack backtrace:
[  949.762161][ T4631] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  949.762598][ T4631] Call Trace:
[  949.762721][ T4631]  <TASK>
[ 949.762806][ T4631] dump_stack_lvl (lib/dump_stack.c:122) 
[ 949.762971][ T4631] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 949.763317][ T4631] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 949.763486][ T4631] br_get_link_af_size_filtered (net/bridge/br_private.h:1611 net/bridge/br_private.h:1608 net/bridge/br_netlink.c:107) 
[ 949.763686][ T4631] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 949.763846][ T4631] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 949.764105][ T4631] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 949.764271][ T4631] br_make_forwarding (net/bridge/br_stp.c:465) 
[ 949.764434][ T4631] br_port_state_selection (net/bridge/br_stp.c:495) 
[ 949.764599][ T4631] br_stp_enable_port (net/bridge/br_stp_if.c:95) 
[ 949.764848][ T4631] br_add_if (net/bridge/br_if.c:687) 
[ 949.764975][ T4631] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 949.765141][ T4631] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 949.765343][ T4631] do_setlink (net/core/rtnetlink.c:2907) 
[ 949.765504][ T4631] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 949.765759][ T4631] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 949.765917][ T4631] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 949.766076][ T4631] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 949.766239][ T4631] ? __kernel_text_address (kernel/extable.c:79) 
[ 949.766490][ T4631] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 949.766655][ T4631] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 949.766853][ T4631] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 949.767026][ T4631] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 949.767278][ T4631] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 949.767435][ T4631] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 949.767601][ T4631] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 949.767724][ T4631] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 949.767978][ T4631] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 949.768150][ T4631] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 949.768316][ T4631] ? 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:227) 
[ 949.768475][ T4631] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 949.768638][ T4631] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 949.768936][ T4631] ? __create_object (mm/kmemleak.c:751) 
[ 949.769095][ T4631] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 949.769264][ T4631] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 949.769389][ T4631] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 949.769558][ T4631] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 949.769716][ T4631] ? 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:227) 
[ 949.769874][ T4631] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 949.769999][ T4631] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 949.770256][ T4631] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 949.770412][ T4631] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 949.770570][ T4631] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 949.770741][ T4631] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 949.770906][ T4631] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 949.771160][ T4631] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 949.771323][ T4631] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 949.771480][ T4631] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 949.771642][ T4631] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 949.771897][ T4631] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 949.772053][ T4631] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 949.772218][ T4631] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 949.772385][ T4631] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 949.772644][ T4631] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 949.772802][ T4631] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 949.773000][ T4631] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 949.773170][ T4631] ___sys_sendmsg (net/socket.c:2653) 
[ 949.773424][ T4631] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 949.773587][ T4631] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 949.773749][ T4631] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 949.773907][ T4631] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 949.774202][ T4631] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 949.774362][ T4631] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 949.774525][ T4631] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 949.774722][ T4631] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 949.774976][ T4631] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 949.775131][ T4631] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 949.775287][ T4631] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:94 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2034 arch/x86/mm/physaddr.c:65) 
[ 949.775469][ T4631] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 949.775822][ T4631] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  949.776018][ T4631] RIP: 0033:0x7f0fe3a657b7
[ 949.776182][ T4631] 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)
[  949.776728][ T4631] RSP: 002b:00007ffc0609ef18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  949.776970][ T4631] RAX: ffffffffffffffda RBX: 00007ffc0609f640 RCX: 00007f0fe3a657b7
[  949.777302][ T4631] RDX: 0000000000000000 RSI: 00007ffc0609ef80 RDI: 0000000000000005
[  949.777542][ T4631] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[  949.777776][ T4631] R10: 0000000009506910 R11: 0000000000000246 R12: 0000000000000003


Finger prints:
lockdep_rcu_suspicious:br_get_link_af_size_filtered:br_info_notify:br_make_forwarding:br_port_state_selection