======================================
| [ 520.283241][ T1484] #0: ffffffff9c7bc508 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 520.283660][ T1484] #1: ffff888006b2ac58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) bridge
| [  520.284142][ T1484]
| [  520.284142][ T1484] stack backtrace:
[  520.284807][ T1484] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  520.285292][ T1484] Call Trace:
[  520.285463][ T1484]  <TASK>
[ 520.285597][ T1484] dump_stack_lvl (lib/dump_stack.c:122) 
[ 520.285851][ T1484] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 520.286105][ T1484] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) bridge
[ 520.286456][ T1484] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) bridge
[ 520.286758][ T1484] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 520.286969][ T1484] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 520.287203][ T1484] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) bridge
[ 520.287465][ T1484] br_make_forwarding (net/bridge/br_stp.c:465) bridge
[ 520.287700][ T1484] br_port_state_selection (net/bridge/br_stp.c:495) bridge
[ 520.288015][ T1484] br_stp_enable_port (net/bridge/br_stp_if.c:95) bridge
[ 520.288255][ T1484] br_add_if (net/bridge/br_if.c:687) bridge
[ 520.288502][ T1484] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 520.288748][ T1484] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 520.289006][ T1484] do_setlink (net/core/rtnetlink.c:2907) 
[ 520.289222][ T1484] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 520.289455][ T1484] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 520.289649][ T1484] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 520.289847][ T1484] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 520.290065][ T1484] ? __kernel_text_address (kernel/extable.c:79) 
[ 520.290287][ T1484] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 520.290511][ T1484] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 520.290796][ T1484] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 520.291000][ T1484] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 520.291232][ T1484] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 520.291431][ T1484] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 520.291677][ T1484] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 520.291895][ T1484] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 520.292113][ T1484] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 520.292353][ T1484] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 520.292583][ T1484] ? 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) 
[ 520.292807][ T1484] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 520.293080][ T1484] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 520.293350][ T1484] ? __create_object (mm/kmemleak.c:751) 
[ 520.293629][ T1484] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 520.293859][ T1484] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 520.294019][ T1484] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 520.294221][ T1484] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 520.294447][ T1484] ? 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) 
[ 520.294667][ T1484] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 520.294836][ T1484] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 520.295040][ T1484] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 520.295250][ T1484] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 520.295460][ T1484] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 520.295711][ T1484] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 520.295959][ T1484] ? 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) 
[ 520.296206][ T1484] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 520.296430][ T1484] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 520.296644][ T1484] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 520.296863][ T1484] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 520.297106][ T1484] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 520.297321][ T1484] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 520.297556][ T1484] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 520.297775][ T1484] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 520.297988][ T1484] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 520.298197][ T1484] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 520.298447][ T1484] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 520.298686][ T1484] ___sys_sendmsg (net/socket.c:2653) 
[ 520.298892][ T1484] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 520.299094][ T1484] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 520.299321][ T1484] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 520.299518][ T1484] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 520.299796][ T1484] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 520.299997][ T1484] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 520.300221][ T1484] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 520.300482][ T1484] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 520.300710][ T1484] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 520.300925][ T1484] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 520.301147][ T1484] ? __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) 
[ 520.301370][ T1484] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 520.301597][ T1484] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  520.301892][ T1484] RIP: 0033:0x7f7e4bce57b7
[ 520.302147][ T1484] 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)
[  520.303200][ T1484] RSP: 002b:00007ffc52c92788 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  520.303777][ T1484] RAX: ffffffffffffffda RBX: 00007ffc52c92eb0 RCX: 00007f7e4bce57b7
[  520.304277][ T1484] RDX: 0000000000000000 RSI: 00007ffc52c927f0 RDI: 0000000000000005
[  520.304779][ T1484] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[  520.305267][ T1484] R10: 0000000018408910 R11: 0000000000000246 R12: 0000000000000003
[  520.305629][ T1484] R13: 0000000066be9ca7 R14: 0000000000496600 R15: 0000000000000000
| [ 520.309677][ T1484] #0: ffffffff9c7bc508 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 520.310292][ T1484] #1: ffff888006b2ac58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) bridge
| [  520.310931][ T1484]
| [  520.310931][ T1484] stack backtrace:
[  520.311801][ T1484] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  520.312511][ T1484] Call Trace:
[  520.312761][ T1484]  <TASK>
[ 520.312938][ T1484] dump_stack_lvl (lib/dump_stack.c:122) 
[ 520.313270][ T1484] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 520.313590][ T1484] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) bridge
[ 520.314048][ T1484] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) bridge
[ 520.314490][ T1484] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 520.314814][ T1484] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 520.315142][ T1484] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) bridge
[ 520.315551][ T1484] br_make_forwarding (net/bridge/br_stp.c:465) bridge
[ 520.315924][ T1484] br_port_state_selection (net/bridge/br_stp.c:495) bridge
[ 520.316285][ T1484] br_stp_enable_port (net/bridge/br_stp_if.c:95) bridge
[ 520.316537][ T1484] br_add_if (net/bridge/br_if.c:687) bridge
[ 520.316804][ T1484] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 520.317036][ T1484] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 520.317323][ T1484] do_setlink (net/core/rtnetlink.c:2907) 
[ 520.317540][ T1484] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 520.317752][ T1484] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 520.317958][ T1484] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 520.318156][ T1484] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 520.318418][ T1484] ? __kernel_text_address (kernel/extable.c:79) 
[ 520.318619][ T1484] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 520.318833][ T1484] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 520.319112][ T1484] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 520.319328][ T1484] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 520.319561][ T1484] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 520.319760][ T1484] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 520.319984][ T1484] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 520.320163][ T1484] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 520.320369][ T1484] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 520.320590][ T1484] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 520.320802][ T1484] ? 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) 
[ 520.321015][ T1484] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 520.321248][ T1484] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 520.321527][ T1484] ? __create_object (mm/kmemleak.c:751) 
[ 520.321776][ T1484] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 520.321996][ T1484] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 520.322175][ T1484] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 520.322524][ T1484] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 520.322752][ T1484] ? 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) 
[ 520.322972][ T1484] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 520.323150][ T1484] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 520.323345][ T1484] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 520.323545][ T1484] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 520.323745][ T1484] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 520.324009][ T1484] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 520.324262][ T1484] ? 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) 
[ 520.324462][ T1484] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 520.324681][ T1484] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 520.325121][ T1484] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 520.325335][ T1484] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 520.325572][ T1484] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 520.325787][ T1484] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 520.326103][ T1484] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 520.326319][ T1484] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 520.326533][ T1484] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 520.326761][ T1484] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 520.327135][ T1484] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 520.327376][ T1484] ___sys_sendmsg (net/socket.c:2653) 
[ 520.327585][ T1484] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 520.327779][ T1484] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 520.328008][ T1484] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 520.328340][ T1484] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 520.328617][ T1484] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 520.328821][ T1484] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 520.329092][ T1484] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 520.329453][ T1484] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 520.329681][ T1484] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 520.329880][ T1484] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 520.330106][ T1484] ? __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) 
[ 520.330554][ T1484] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 520.330752][ T1484] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  520.331008][ T1484] RIP: 0033:0x7f7e4bce57b7
[ 520.331255][ T1484] 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)
[  520.332037][ T1484] RSP: 002b:00007ffc52c92788 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  520.332339][ T1484] RAX: ffffffffffffffda RBX: 00007ffc52c92eb0 RCX: 00007f7e4bce57b7
[  520.332674][ T1484] RDX: 0000000000000000 RSI: 00007ffc52c927f0 RDI: 0000000000000005
[  520.332998][ T1484] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[  520.333332][ T1484] R10: 0000000018408910 R11: 0000000000000246 R12: 0000000000000003
[  520.333625][ T1484] R13: 0000000066be9ca7 R14: 0000000000496600 R15: 0000000000000000
| [ 520.336911][ T1484] #0: ffffffff9c7bc508 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [ 520.337309][ T1484] #1: ffff888006b2ac58 (&br->lock){+...}-{2:2}, at: br_add_if (net/bridge/br_if.c:683) bridge
| [  520.337734][ T1484]
| [  520.337734][ T1484] stack backtrace:
[  520.338322][ T1484] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  520.338786][ T1484] Call Trace:
[  520.338941][ T1484]  <TASK>
[ 520.339042][ T1484] dump_stack_lvl (lib/dump_stack.c:122) 
[ 520.339382][ T1484] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 520.339599][ T1484] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) bridge
[ 520.339926][ T1484] br_get_link_af_size_filtered (net/bridge/br_private.h:1611 net/bridge/br_private.h:1608 net/bridge/br_netlink.c:107) bridge
[ 520.340212][ T1484] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 520.340551][ T1484] ? __timer_delete (./include/linux/list.h:971 ./include/linux/timer.h:147 kernel/time/timer.c:1426) 
[ 520.340748][ T1484] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) bridge
[ 520.341011][ T1484] br_make_forwarding (net/bridge/br_stp.c:465) bridge
[ 520.341257][ T1484] br_port_state_selection (net/bridge/br_stp.c:495) bridge
[ 520.341559][ T1484] br_stp_enable_port (net/bridge/br_stp_if.c:95) bridge
[ 520.341794][ T1484] br_add_if (net/bridge/br_if.c:687) bridge
[ 520.342025][ T1484] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 520.342237][ T1484] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 520.342547][ T1484] do_setlink (net/core/rtnetlink.c:2907) 
[ 520.342840][ T1484] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 520.343037][ T1484] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 520.343255][ T1484] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 520.343589][ T1484] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 520.343799][ T1484] ? __kernel_text_address (kernel/extable.c:79) 
[ 520.344021][ T1484] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 520.344207][ T1484] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 520.344466][ T1484] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 520.344675][ T1484] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 520.344902][ T1484] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 520.345094][ T1484] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 520.345290][ T1484] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 520.345442][ T1484] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 520.345646][ T1484] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 520.345841][ T1484] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 520.346100][ T1484] ? 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) 
[ 520.346580][ T1484] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 520.346824][ T1484] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 520.347086][ T1484] ? __create_object (mm/kmemleak.c:751) 
[ 520.347297][ T1484] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 520.347513][ T1484] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 520.347677][ T1484] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 520.347894][ T1484] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 520.348099][ T1484] ? 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) 
[ 520.348304][ T1484] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 520.348461][ T1484] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 520.348673][ T1484] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 520.348885][ T1484] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 520.349092][ T1484] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 520.349430][ T1484] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 520.349632][ T1484] ? 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) 
[ 520.349840][ T1484] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 520.350053][ T1484] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 520.350377][ T1484] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 520.350598][ T1484] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 520.350815][ T1484] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 520.351066][ T1484] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 520.351584][ T1484] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 520.351920][ T1484] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 520.352231][ T1484] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 520.352492][ T1484] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 520.352761][ T1484] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 520.352975][ T1484] ___sys_sendmsg (net/socket.c:2653) 
[ 520.353199][ T1484] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 520.353402][ T1484] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 520.353629][ T1484] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 520.353862][ T1484] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 520.354135][ T1484] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 520.354360][ T1484] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 520.354579][ T1484] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 520.355000][ T1484] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 520.355237][ T1484] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 520.355439][ T1484] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 520.355674][ T1484] ? __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) 
[ 520.356056][ T1484] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 520.356319][ T1484] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  520.356591][ T1484] RIP: 0033:0x7f7e4bce57b7
[ 520.356804][ T1484] 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)
[  520.357715][ T1484] RSP: 002b:00007ffc52c92788 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  520.358183][ T1484] RAX: ffffffffffffffda RBX: 00007ffc52c92eb0 RCX: 00007f7e4bce57b7
[  520.358502][ T1484] RDX: 0000000000000000 RSI: 00007ffc52c927f0 RDI: 0000000000000005
[  520.358797][ T1484] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[  520.359248][ T1484] R10: 0000000018408910 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