======================================
| [   29.098837][  T277] 1 lock held by ip/277:
| [ 29.098997][ T277] #0: ffffffffa4bd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   29.099352][  T277]
| [   29.099352][  T277] stack backtrace:
[   29.099891][  T277] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   29.100302][  T277] Call Trace:
[   29.100466][  T277]  <TASK>
[ 29.100559][ T277] dump_stack_lvl (lib/dump_stack.c:122) 
[ 29.100748][ T277] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 29.100941][ T277] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 29.101122][ T277] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 29.101347][ T277] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 29.101554][ T277] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.101775][ T277] br_add_if (net/bridge/br_if.c:692) 
[ 29.101927][ T277] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 29.102104][ T277] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 29.102346][ T277] do_setlink (net/core/rtnetlink.c:2907) 
[ 29.102543][ T277] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 29.102727][ T277] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 29.102907][ T277] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 29.103109][ T277] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 29.103287][ T277] ? __kernel_text_address (kernel/extable.c:79) 
[ 29.103486][ T277] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 29.103671][ T277] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 29.103889][ T277] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 29.104109][ T277] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 29.104291][ T277] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 29.104478][ T277] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 29.104673][ T277] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.104816][ T277] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 29.105010][ T277] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 29.105216][ T277] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 29.105407][ T277] ? 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) 
[ 29.105599][ T277] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 29.105804][ T277] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.106028][ T277] ? __create_object (mm/kmemleak.c:751) 
[ 29.106212][ T277] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 29.106425][ T277] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 29.106561][ T277] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 29.106777][ T277] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.106949][ T277] ? 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) 
[ 29.107150][ T277] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.107320][ T277] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 29.107511][ T277] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 29.107698][ T277] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.107874][ T277] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 29.108080][ T277] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 29.108261][ T277] ? 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) 
[ 29.108473][ T277] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 29.108652][ T277] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 29.108841][ T277] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.109014][ T277] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 29.109214][ T277] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 29.109403][ T277] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 29.109573][ T277] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 29.109780][ T277] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 29.109963][ T277] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 29.110170][ T277] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 29.110383][ T277] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 29.110603][ T277] ___sys_sendmsg (net/socket.c:2653) 
[ 29.110778][ T277] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 29.110961][ T277] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.111163][ T277] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 29.111370][ T277] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 29.111611][ T277] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 29.111792][ T277] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 29.111964][ T277] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.112180][ T277] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 29.112351][ T277] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 29.112535][ T277] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 29.112692][ T277] ? __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) 
[ 29.112877][ T277] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 29.113055][ T277] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   29.113412][  T277] RIP: 0033:0x7fbcf6ee07b7
[ 29.113593][ T277] 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)
[   29.114187][  T277] RSP: 002b:00007fff223d89c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   29.114545][  T277] RAX: ffffffffffffffda RBX: 00007fff223d90f0 RCX: 00007fbcf6ee07b7
[   29.114811][  T277] RDX: 0000000000000000 RSI: 00007fff223d8a30 RDI: 0000000000000005
[   29.115078][  T277] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   29.115495][  T277] R10: 0000000001335910 R11: 0000000000000246 R12: 0000000000000003
[   29.115747][  T277] R13: 0000000066bea43a R14: 0000000000496600 R15: 0000000000000000
| [   29.117780][  T277] 1 lock held by ip/277:
| [ 29.117992][ T277] #0: ffffffffa4bd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   29.118294][  T277]
| [   29.118294][  T277] stack backtrace:
[   29.118870][  T277] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   29.119241][  T277] Call Trace:
[   29.119541][  T277]  <TASK>
[ 29.119634][ T277] dump_stack_lvl (lib/dump_stack.c:122) 
[ 29.119804][ T277] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 29.119985][ T277] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 29.120198][ T277] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 29.120387][ T277] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.120596][ T277] br_add_if (net/bridge/br_if.c:692) 
[ 29.120837][ T277] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 29.121002][ T277] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 29.121227][ T277] do_setlink (net/core/rtnetlink.c:2907) 
[ 29.121406][ T277] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 29.121691][ T277] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 29.121861][ T277] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 29.122032][ T277] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 29.122200][ T277] ? __kernel_text_address (kernel/extable.c:79) 
[ 29.122378][ T277] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 29.122545][ T277] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 29.122765][ T277] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 29.123114][ T277] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 29.123284][ T277] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 29.123486][ T277] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 29.123656][ T277] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.123785][ T277] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 29.124113][ T277] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 29.124306][ T277] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 29.124501][ T277] ? 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) 
[ 29.124663][ T277] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 29.124933][ T277] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.125146][ T277] ? __create_object (mm/kmemleak.c:751) 
[ 29.125337][ T277] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 29.125519][ T277] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 29.125771][ T277] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 29.125935][ T277] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.126116][ T277] ? 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) 
[ 29.126279][ T277] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.126421][ T277] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 29.126600][ T277] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 29.126763][ T277] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.127063][ T277] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 29.127240][ T277] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 29.127428][ T277] ? 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) 
[ 29.127598][ T277] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 29.127774][ T277] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 29.127934][ T277] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.128443][ T277] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 29.128617][ T277] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 29.128806][ T277] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 29.128990][ T277] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 29.129324][ T277] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 29.129546][ T277] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 29.129726][ T277] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 29.130046][ T277] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 29.130277][ T277] ___sys_sendmsg (net/socket.c:2653) 
[ 29.130625][ T277] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 29.130840][ T277] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.131034][ T277] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 29.131199][ T277] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 29.131583][ T277] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 29.131764][ T277] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 29.131951][ T277] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.132286][ T277] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 29.132593][ T277] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 29.132770][ T277] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 29.132935][ T277] ? __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) 
[ 29.133162][ T277] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 29.133545][ T277] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   29.133848][  T277] RIP: 0033:0x7fbcf6ee07b7
[ 29.134123][ T277] 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)
[   29.135215][  T277] RSP: 002b:00007fff223d89c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   29.135739][  T277] RAX: ffffffffffffffda RBX: 00007fff223d90f0 RCX: 00007fbcf6ee07b7
[   29.136204][  T277] RDX: 0000000000000000 RSI: 00007fff223d8a30 RDI: 0000000000000005
[   29.136518][  T277] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   29.136928][  T277] R10: 0000000001335910 R11: 0000000000000246 R12: 0000000000000003


Finger prints:
lockdep_rcu_suspicious:br_get_link_af_size_filtered:br_info_notify:br_add_if:do_setlink