======================================
| [ 36.425794][ T366] #0: ffffffff873dcac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 36.426128][ T366] #1: ffff8880062d2c58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) 
| [   36.426447][  T366]
| [   36.426447][  T366] stack backtrace:
[   36.426932][  T366] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.427317][  T366] Call Trace:
[   36.427453][  T366]  <TASK>
[ 36.427546][ T366] dump_stack_lvl (lib/dump_stack.c:122) 
[ 36.427729][ T366] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 36.427909][ T366] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 36.428089][ T366] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 36.428311][ T366] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 36.428484][ T366] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 36.428661][ T366] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 36.428833][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4291 kernel/locking/lockdep.c:4358) 
[ 36.429052][ T366] br_make_forwarding (net/bridge/br_stp.c:465) 
[ 36.429239][ T366] br_port_state_selection (net/bridge/br_stp.c:495) 
[ 36.429429][ T366] br_stp_enable_port (net/bridge/br_stp_if.c:95) 
[ 36.429604][ T366] br_add_if (net/bridge/br_if.c:687) 
[ 36.429742][ T366] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 36.429922][ T366] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 36.430145][ T366] do_setlink (net/core/rtnetlink.c:2907) 
[ 36.430323][ T366] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 36.430501][ T366] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 36.430677][ T366] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 36.430854][ T366] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 36.431030][ T366] ? __kernel_text_address (kernel/extable.c:79) 
[ 36.431202][ T366] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 36.431379][ T366] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 36.431595][ T366] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 36.431783][ T366] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 36.431959][ T366] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 36.432134][ T366] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 36.432315][ T366] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.432448][ T366] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 36.432625][ T366] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 36.432818][ T366] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 36.433002][ T366] ? 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) 
[ 36.433189][ T366] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 36.433365][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.433583][ T366] ? __create_object (mm/kmemleak.c:751) 
[ 36.433763][ T366] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 36.433947][ T366] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 36.434081][ T366] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 36.434257][ T366] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 36.434435][ T366] ? 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) 
[ 36.434606][ T366] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.434743][ T366] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 36.434919][ T366] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 36.435093][ T366] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 36.435274][ T366] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 36.435465][ T366] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 36.435639][ T366] ? 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) 
[ 36.435816][ T366] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 36.435997][ T366] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 36.436173][ T366] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.436355][ T366] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 36.436534][ T366] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 36.436713][ T366] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 36.436894][ T366] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 36.437079][ T366] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 36.437256][ T366] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 36.437435][ T366] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 36.437652][ T366] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 36.437836][ T366] ___sys_sendmsg (net/socket.c:2653) 
[ 36.438014][ T366] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 36.438195][ T366] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.438369][ T366] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 36.438540][ T366] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 36.438758][ T366] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 36.438939][ T366] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 36.439126][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.439344][ T366] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 36.439527][ T366] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 36.439712][ T366] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 36.439887][ T366] ? __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) 
[ 36.440092][ T366] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 36.440268][ T366] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   36.440483][  T366] RIP: 0033:0x7f85fa5db7b7
[ 36.440664][ T366] 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)
[   36.441284][  T366] RSP: 002b:00007ffeebe40aa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   36.441549][  T366] RAX: ffffffffffffffda RBX: 00007ffeebe411e0 RCX: 00007f85fa5db7b7
[   36.441809][  T366] RDX: 0000000000000000 RSI: 00007ffeebe40b10 RDI: 0000000000000005
[   36.442087][  T366] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   36.442348][  T366] R10: 000000001cf40910 R11: 0000000000000246 R12: 0000000000000003
[   36.442605][  T366] R13: 0000000066beb145 R14: 0000000000496600 R15: 0000000000000000
| [ 36.444854][ T366] #0: ffffffff873dcac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 36.445182][ T366] #1: ffff8880062d2c58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) 
| [   36.445490][  T366]
| [   36.445490][  T366] stack backtrace:
[   36.445978][  T366] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.446364][  T366] Call Trace:
[   36.446497][  T366]  <TASK>
[ 36.446593][ T366] dump_stack_lvl (lib/dump_stack.c:122) 
[ 36.446773][ T366] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 36.446948][ T366] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 36.447129][ T366] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 36.447347][ T366] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 36.447529][ T366] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 36.447704][ T366] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 36.447882][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4291 kernel/locking/lockdep.c:4358) 
[ 36.448119][ T366] br_make_forwarding (net/bridge/br_stp.c:465) 
[ 36.448296][ T366] br_port_state_selection (net/bridge/br_stp.c:495) 
[ 36.448477][ T366] br_stp_enable_port (net/bridge/br_stp_if.c:95) 
[ 36.448651][ T366] br_add_if (net/bridge/br_if.c:687) 
[ 36.448787][ T366] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 36.448963][ T366] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 36.449193][ T366] do_setlink (net/core/rtnetlink.c:2907) 
[ 36.449371][ T366] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 36.449545][ T366] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 36.449721][ T366] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 36.449896][ T366] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 36.450071][ T366] ? __kernel_text_address (kernel/extable.c:79) 
[ 36.450262][ T366] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 36.450437][ T366] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 36.450651][ T366] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 36.450840][ T366] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 36.451014][ T366] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 36.451193][ T366] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 36.451370][ T366] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.451505][ T366] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 36.451686][ T366] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 36.451870][ T366] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 36.452049][ T366] ? 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) 
[ 36.452229][ T366] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 36.452410][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.452631][ T366] ? __create_object (mm/kmemleak.c:751) 
[ 36.452804][ T366] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 36.452986][ T366] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 36.453133][ T366] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 36.453310][ T366] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 36.453484][ T366] ? 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) 
[ 36.453656][ T366] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.453798][ T366] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 36.453973][ T366] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 36.454148][ T366] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 36.454324][ T366] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 36.454511][ T366] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 36.454684][ T366] ? 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) 
[ 36.454858][ T366] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 36.455047][ T366] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 36.455225][ T366] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.455399][ T366] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 36.455573][ T366] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 36.455743][ T366] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 36.455916][ T366] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 36.456094][ T366] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 36.456266][ T366] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 36.456436][ T366] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 36.456648][ T366] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 36.456828][ T366] ___sys_sendmsg (net/socket.c:2653) 
[ 36.457009][ T366] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 36.457185][ T366] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.457357][ T366] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 36.457524][ T366] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 36.457734][ T366] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 36.458036][ T366] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 36.458216][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.458429][ T366] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 36.458627][ T366] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 36.458895][ T366] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 36.459067][ T366] ? __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) 
[ 36.459259][ T366] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 36.459433][ T366] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   36.459739][  T366] RIP: 0033:0x7f85fa5db7b7
[ 36.459916][ T366] 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)
[   36.460612][  T366] RSP: 002b:00007ffeebe40aa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   36.460874][  T366] RAX: ffffffffffffffda RBX: 00007ffeebe411e0 RCX: 00007f85fa5db7b7
[   36.461136][  T366] RDX: 0000000000000000 RSI: 00007ffeebe40b10 RDI: 0000000000000005
[   36.461490][  T366] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   36.461748][  T366] R10: 000000001cf40910 R11: 0000000000000246 R12: 0000000000000003
[   36.462007][  T366] R13: 0000000066beb145 R14: 0000000000496600 R15: 0000000000000000
| [ 36.464614][ T366] #0: ffffffff873dcac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 36.465022][ T366] #1: ffff8880062d2c58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) 
| [   36.465341][  T366]
| [   36.465341][  T366] stack backtrace:
[   36.465903][  T366] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.466285][  T366] Call Trace:
[   36.466415][  T366]  <TASK>
[ 36.466595][ T366] dump_stack_lvl (lib/dump_stack.c:122) 
[ 36.466769][ T366] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 36.466940][ T366] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 36.467115][ T366] br_get_link_af_size_filtered (net/bridge/br_private.h:1611 net/bridge/br_private.h:1608 net/bridge/br_netlink.c:107) 
[ 36.467417][ T366] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 36.467586][ T366] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 36.467759][ T366] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 36.467932][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4291 kernel/locking/lockdep.c:4358) 
[ 36.468237][ T366] br_make_forwarding (net/bridge/br_stp.c:465) 
[ 36.468408][ T366] br_port_state_selection (net/bridge/br_stp.c:495) 
[ 36.468582][ T366] br_stp_enable_port (net/bridge/br_stp_if.c:95) 
[ 36.468752][ T366] br_add_if (net/bridge/br_if.c:687) 
[ 36.468889][ T366] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 36.469152][ T366] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 36.469367][ T366] do_setlink (net/core/rtnetlink.c:2907) 
[ 36.469539][ T366] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 36.469709][ T366] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 36.469968][ T366] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 36.470137][ T366] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 36.470311][ T366] ? __kernel_text_address (kernel/extable.c:79) 
[ 36.470487][ T366] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 36.470749][ T366] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 36.470971][ T366] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 36.471155][ T366] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 36.471326][ T366] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 36.471588][ T366] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 36.471762][ T366] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.471896][ T366] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 36.472075][ T366] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 36.472347][ T366] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 36.472526][ T366] ? 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) 
[ 36.472698][ T366] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 36.472874][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.473217][ T366] ? __create_object (mm/kmemleak.c:751) 
[ 36.473388][ T366] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 36.473566][ T366] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 36.473699][ T366] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 36.473872][ T366] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 36.474133][ T366] ? 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) 
[ 36.474322][ T366] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.474455][ T366] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 36.474623][ T366] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 36.474893][ T366] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 36.475064][ T366] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 36.475250][ T366] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 36.475431][ T366] ? 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) 
[ 36.475603][ T366] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 36.475954][ T366] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 36.476121][ T366] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.476293][ T366] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 36.476476][ T366] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 36.476728][ T366] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 36.476902][ T366] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 36.477079][ T366] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 36.477248][ T366] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 36.477505][ T366] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 36.477713][ T366] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 36.477891][ T366] ___sys_sendmsg (net/socket.c:2653) 
[ 36.478062][ T366] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 36.478322][ T366] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.478495][ T366] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 36.478680][ T366] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 36.478895][ T366] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 36.479164][ T366] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 36.479342][ T366] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.479559][ T366] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 36.479738][ T366] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 36.480000][ T366] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 36.480173][ T366] ? __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) 
[ 36.480366][ T366] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 36.480540][ T366] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   36.480847][  T366] RIP: 0033:0x7f85fa5db7b7
[ 36.481025][ T366] 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)
[   36.481722][  T366] RSP: 002b:00007ffeebe40aa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   36.481986][  T366] RAX: ffffffffffffffda RBX: 00007ffeebe411e0 RCX: 00007f85fa5db7b7
[   36.482256][  T366] RDX: 0000000000000000 RSI: 00007ffeebe40b10 RDI: 0000000000000005
[   36.482605][  T366] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   36.482858][  T366] R10: 000000001cf40910 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