======================================
| [   29.145200][  T261] 1 lock held by ip/261:
| [ 29.145956][ T261] #0: ffffffffa1fd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   29.146318][  T261]
| [   29.146318][  T261] stack backtrace:
[   29.146770][  T261] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   29.147138][  T261] Call Trace:
[   29.147278][  T261]  <TASK>
[ 29.147367][ T261] dump_stack_lvl (lib/dump_stack.c:122) 
[ 29.147620][ T261] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 29.147788][ T261] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 29.147977][ T261] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 29.148195][ T261] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 29.148363][ T261] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.148578][ T261] br_add_if (net/bridge/br_if.c:692) 
[ 29.148715][ T261] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 29.148882][ T261] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 29.149094][ T261] do_setlink (net/core/rtnetlink.c:2907) 
[ 29.149267][ T261] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 29.149442][ T261] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 29.149616][ T261] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 29.149790][ T261] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 29.149962][ T261] ? __kernel_text_address (kernel/extable.c:79) 
[ 29.150126][ T261] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 29.150290][ T261] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 29.150530][ T261] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 29.150711][ T261] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 29.150881][ T261] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 29.151058][ T261] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 29.151225][ T261] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.151363][ T261] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 29.151533][ T261] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 29.151724][ T261] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 29.151917][ T261] ? 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) 
[ 29.152088][ T261] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 29.152261][ T261] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.152475][ T261] ? __create_object (mm/kmemleak.c:751) 
[ 29.152647][ T261] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 29.152825][ T261] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 29.152957][ T261] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 29.153128][ T261] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.153297][ T261] ? 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) 
[ 29.153463][ T261] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.153600][ T261] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 29.153771][ T261] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 29.153942][ T261] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.154120][ T261] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 29.154305][ T261] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 29.154478][ T261] ? 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) 
[ 29.154651][ T261] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 29.154828][ T261] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 29.154999][ T261] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.155177][ T261] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 29.155353][ T261] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 29.155522][ T261] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 29.155698][ T261] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 29.155878][ T261] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 29.156053][ T261] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 29.156226][ T261] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 29.156440][ T261] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 29.156623][ T261] ___sys_sendmsg (net/socket.c:2653) 
[ 29.156799][ T261] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 29.156972][ T261] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.157141][ T261] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 29.157311][ T261] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 29.157521][ T261] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 29.157693][ T261] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 29.157865][ T261] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.158071][ T261] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 29.158253][ T261] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 29.158421][ T261] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 29.158584][ T261] ? __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) 
[ 29.158774][ T261] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 29.158943][ T261] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   29.159155][  T261] RIP: 0033:0x7ff8e5c227b7
[ 29.159328][ T261] 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)
[   29.159913][  T261] RSP: 002b:00007ffc0b143da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   29.160162][  T261] RAX: ffffffffffffffda RBX: 00007ffc0b1444e0 RCX: 00007ff8e5c227b7
[   29.160414][  T261] RDX: 0000000000000000 RSI: 00007ffc0b143e10 RDI: 0000000000000005
[   29.160661][  T261] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   29.160911][  T261] R10: 000000002dbf5910 R11: 0000000000000246 R12: 0000000000000003
[   29.161160][  T261] R13: 0000000066be9d97 R14: 0000000000496600 R15: 0000000000000000
| [   29.163253][  T261] 1 lock held by ip/261:
| [ 29.163394][ T261] #0: ffffffffa1fd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   29.163699][  T261]
| [   29.163699][  T261] stack backtrace:
[   29.164155][  T261] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   29.164518][  T261] Call Trace:
[   29.164651][  T261]  <TASK>
[ 29.164739][ T261] dump_stack_lvl (lib/dump_stack.c:122) 
[ 29.164911][ T261] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 29.165082][ T261] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 29.165288][ T261] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 29.165455][ T261] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.165666][ T261] br_add_if (net/bridge/br_if.c:692) 
[ 29.165800][ T261] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 29.165962][ T261] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 29.166177][ T261] do_setlink (net/core/rtnetlink.c:2907) 
[ 29.166341][ T261] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 29.166510][ T261] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 29.166674][ T261] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 29.166840][ T261] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 29.167007][ T261] ? __kernel_text_address (kernel/extable.c:79) 
[ 29.167171][ T261] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 29.167338][ T261] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 29.167544][ T261] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 29.167724][ T261] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 29.168028][ T261] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 29.168193][ T261] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 29.168360][ T261] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.168490][ T261] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 29.168660][ T261] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 29.168917][ T261] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 29.169093][ T261] ? 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) 
[ 29.169262][ T261] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 29.169435][ T261] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.169740][ T261] ? __create_object (mm/kmemleak.c:751) 
[ 29.169910][ T261] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 29.170082][ T261] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 29.170210][ T261] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 29.170551][ T261] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.170722][ T261] ? 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) 
[ 29.170887][ T261] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 29.171018][ T261] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 29.171187][ T261] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 29.171438][ T261] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 29.171607][ T261] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 29.171789][ T261] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 29.171969][ T261] ? 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) 
[ 29.172229][ T261] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 29.172397][ T261] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 29.172562][ T261] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.172737][ T261] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 29.173000][ T261] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 29.173164][ T261] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 29.173333][ T261] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 29.173535][ T261] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 29.173714][ T261] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 29.173971][ T261] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 29.174175][ T261] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 29.174366][ T261] ___sys_sendmsg (net/socket.c:2653) 
[ 29.174542][ T261] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 29.174798][ T261] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.174972][ T261] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 29.175146][ T261] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 29.175363][ T261] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 29.175620][ T261] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 29.175795][ T261] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.176004][ T261] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 29.176180][ T261] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 29.176433][ T261] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 29.176599][ T261] ? __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) 
[ 29.176784][ T261] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 29.176957][ T261] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   29.177255][  T261] RIP: 0033:0x7ff8e5c227b7
[ 29.177428][ T261] 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)
[   29.178104][  T261] RSP: 002b:00007ffc0b143da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   29.178362][  T261] RAX: ffffffffffffffda RBX: 00007ffc0b1444e0 RCX: 00007ff8e5c227b7
[   29.178613][  T261] RDX: 0000000000000000 RSI: 00007ffc0b143e10 RDI: 0000000000000005
[   29.178950][  T261] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   29.179196][  T261] R10: 000000002dbf5910 R11: 0000000000000246 R12: 0000000000000003


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