======================================
| [   31.148579][  T284] 1 lock held by ip/284:
| [ 31.148738][ T284] #0: ffffffffa7bd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   31.149080][  T284]
| [   31.149080][  T284] stack backtrace:
[   31.149593][  T284] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   31.150005][  T284] Call Trace:
[   31.150134][  T284]  <TASK>
[ 31.150215][ T284] dump_stack_lvl (lib/dump_stack.c:122) 
[ 31.150415][ T284] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 31.150574][ T284] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 31.150753][ T284] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 31.150958][ T284] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 31.151118][ T284] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 31.151319][ T284] br_add_if (net/bridge/br_if.c:692) 
[ 31.151443][ T284] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 31.151604][ T284] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 31.151823][ T284] do_setlink (net/core/rtnetlink.c:2907) 
[ 31.151992][ T284] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 31.152185][ T284] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 31.152368][ T284] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 31.152553][ T284] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 31.152742][ T284] ? __kernel_text_address (kernel/extable.c:79) 
[ 31.152900][ T284] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 31.153080][ T284] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 31.153275][ T284] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 31.153449][ T284] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 31.153628][ T284] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 31.153788][ T284] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 31.153948][ T284] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 31.154090][ T284] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 31.154252][ T284] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 31.154433][ T284] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 31.154611][ T284] ? 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) 
[ 31.154783][ T284] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 31.154986][ T284] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 31.155181][ T284] ? __create_object (mm/kmemleak.c:751) 
[ 31.155369][ T284] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 31.155527][ T284] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 31.155665][ T284] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 31.155822][ T284] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 31.155989][ T284] ? 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) 
[ 31.156141][ T284] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 31.156264][ T284] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 31.156420][ T284] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 31.156575][ T284] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 31.156741][ T284] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 31.156930][ T284] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 31.157091][ T284] ? 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) 
[ 31.157249][ T284] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 31.157435][ T284] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 31.157588][ T284] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 31.157773][ T284] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 31.157948][ T284] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 31.158109][ T284] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 31.158296][ T284] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 31.158459][ T284] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 31.158643][ T284] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 31.158799][ T284] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 31.159012][ T284] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 31.159191][ T284] ___sys_sendmsg (net/socket.c:2653) 
[ 31.159348][ T284] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 31.159536][ T284] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 31.159692][ T284] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 31.159867][ T284] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 31.160086][ T284] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 31.160285][ T284] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 31.160472][ T284] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 31.160714][ T284] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 31.160902][ T284] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 31.161103][ T284] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 31.161271][ T284] ? __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) 
[ 31.161484][ T284] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 31.161667][ T284] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   31.161880][  T284] RIP: 0033:0x7f3beb0707b7
[ 31.162081][ T284] 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)
[   31.162734][  T284] RSP: 002b:00007fff9ac47138 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   31.163004][  T284] RAX: ffffffffffffffda RBX: 00007fff9ac47870 RCX: 00007f3beb0707b7
[   31.163279][  T284] RDX: 0000000000000000 RSI: 00007fff9ac471a0 RDI: 0000000000000005
[   31.163552][  T284] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   31.163821][  T284] R10: 0000000031022910 R11: 0000000000000246 R12: 0000000000000003
[   31.164089][  T284] R13: 0000000066be9f88 R14: 0000000000496600 R15: 0000000000000000
| [   31.166226][  T284] 1 lock held by ip/284:
| [ 31.166356][ T284] #0: ffffffffa7bd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   31.166681][  T284]
| [   31.166681][  T284] stack backtrace:
[   31.167142][  T284] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   31.167515][  T284] Call Trace:
[   31.167646][  T284]  <TASK>
[ 31.167736][ T284] dump_stack_lvl (lib/dump_stack.c:122) 
[ 31.167919][ T284] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 31.168089][ T284] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 31.168305][ T284] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 31.168473][ T284] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 31.168688][ T284] br_add_if (net/bridge/br_if.c:692) 
[ 31.168823][ T284] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 31.168991][ T284] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 31.169206][ T284] do_setlink (net/core/rtnetlink.c:2907) 
[ 31.169383][ T284] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 31.169554][ T284] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 31.169722][ T284] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 31.169891][ T284] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 31.170063][ T284] ? __kernel_text_address (kernel/extable.c:79) 
[ 31.170235][ T284] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 31.170389][ T284] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 31.170582][ T284] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 31.170746][ T284] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 31.170903][ T284] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 31.171085][ T284] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 31.171254][ T284] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 31.171406][ T284] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 31.171567][ T284] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 31.171741][ T284] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 31.171917][ T284] ? 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) 
[ 31.172079][ T284] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 31.172240][ T284] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 31.172436][ T284] ? __create_object (mm/kmemleak.c:751) 
[ 31.172592][ T284] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 31.172752][ T284] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 31.172881][ T284] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 31.173053][ T284] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 31.173253][ T284] ? 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) 
[ 31.173409][ T284] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 31.173547][ T284] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 31.173716][ T284] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 31.173873][ T284] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 31.174053][ T284] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 31.174220][ T284] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 31.174394][ T284] ? 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) 
[ 31.174550][ T284] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 31.174723][ T284] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 31.174917][ T284] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 31.175077][ T284] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 31.175245][ T284] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 31.175413][ T284] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 31.175574][ T284] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 31.175750][ T284] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 31.175918][ T284] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 31.176074][ T284] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 31.176290][ T284] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 31.176454][ T284] ___sys_sendmsg (net/socket.c:2653) 
[ 31.176639][ T284] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 31.176795][ T284] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 31.176993][ T284] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 31.177142][ T284] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 31.177342][ T284] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 31.177534][ T284] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 31.177717][ T284] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 31.177950][ T284] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 31.178112][ T284] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 31.178288][ T284] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 31.178439][ T284] ? __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) 
[ 31.178621][ T284] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 31.178806][ T284] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   31.179014][  T284] RIP: 0033:0x7f3beb0707b7
[ 31.179201][ T284] 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)
[   31.179928][  T284] RSP: 002b:00007fff9ac47138 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   31.180163][  T284] RAX: ffffffffffffffda RBX: 00007fff9ac47870 RCX: 00007f3beb0707b7
[   31.180414][  T284] RDX: 0000000000000000 RSI: 00007fff9ac471a0 RDI: 0000000000000005
[   31.180639][  T284] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   31.180865][  T284] R10: 0000000031022910 R11: 0000000000000246 R12: 0000000000000003


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