======================================
| [   28.305973][  T257] 1 lock held by ip/257:
| [ 28.306111][ T257] #0: ffffffffaa7d2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   28.306446][  T257]
| [   28.306446][  T257] stack backtrace:
[   28.307043][  T257] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.307445][  T257] Call Trace:
[   28.307585][  T257]  <TASK>
[ 28.307680][ T257] dump_stack_lvl (lib/dump_stack.c:122) 
[ 28.307866][ T257] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 28.308042][ T257] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 28.308224][ T257] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 28.308484][ T257] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 28.308661][ T257] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 28.308881][ T257] br_add_if (net/bridge/br_if.c:692) 
[ 28.309021][ T257] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 28.309197][ T257] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 28.309433][ T257] do_setlink (net/core/rtnetlink.c:2907) 
[ 28.309615][ T257] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 28.309793][ T257] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 28.309972][ T257] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 28.310153][ T257] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 28.310335][ T257] ? __kernel_text_address (kernel/extable.c:79) 
[ 28.310513][ T257] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 28.310699][ T257] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 28.310945][ T257] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 28.311136][ T257] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 28.311324][ T257] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 28.311519][ T257] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 28.311706][ T257] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 28.311848][ T257] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 28.312039][ T257] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 28.312230][ T257] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 28.312438][ T257] ? 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) 
[ 28.312628][ T257] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 28.312822][ T257] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 28.313054][ T257] ? __create_object (mm/kmemleak.c:751) 
[ 28.313240][ T257] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 28.313437][ T257] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 28.313584][ T257] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 28.313777][ T257] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 28.313965][ T257] ? 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) 
[ 28.314163][ T257] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 28.314303][ T257] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 28.314502][ T257] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 28.314679][ T257] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 28.314871][ T257] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 28.315080][ T257] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 28.315266][ T257] ? 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) 
[ 28.315457][ T257] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 28.315651][ T257] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 28.315837][ T257] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 28.316022][ T257] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 28.316212][ T257] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 28.316390][ T257] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 28.316585][ T257] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 28.316775][ T257] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 28.316963][ T257] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 28.317152][ T257] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 28.317384][ T257] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 28.317592][ T257] ___sys_sendmsg (net/socket.c:2653) 
[ 28.317783][ T257] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 28.317963][ T257] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 28.318158][ T257] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 28.318336][ T257] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 28.318654][ T257] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 28.318932][ T257] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 28.319216][ T257] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 28.319552][ T257] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 28.319835][ T257] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 28.320103][ T257] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 28.320371][ T257] ? __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) 
[ 28.320676][ T257] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.320952][ T257] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.321289][  T257] RIP: 0033:0x7f430a3787b7
[ 28.321574][ T257] 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)
[   28.322433][  T257] RSP: 002b:00007ffe6da28458 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   28.322852][  T257] RAX: ffffffffffffffda RBX: 00007ffe6da28b90 RCX: 00007f430a3787b7
[   28.323120][  T257] RDX: 0000000000000000 RSI: 00007ffe6da284c0 RDI: 0000000000000005
[   28.323420][  T257] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   28.323832][  T257] R10: 000000003feed910 R11: 0000000000000246 R12: 0000000000000003
[   28.324092][  T257] R13: 0000000066be9a78 R14: 0000000000496600 R15: 0000000000000000
| [   28.326602][  T257] 1 lock held by ip/257:
| [ 28.326810][ T257] #0: ffffffffaa7d2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   28.327132][  T257]
| [   28.327132][  T257] stack backtrace:
[   28.327628][  T257] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.328103][  T257] Call Trace:
[   28.328240][  T257]  <TASK>
[ 28.328339][ T257] dump_stack_lvl (lib/dump_stack.c:122) 
[ 28.328538][ T257] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 28.328839][ T257] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 28.329062][ T257] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 28.329237][ T257] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 28.329470][ T257] br_add_if (net/bridge/br_if.c:692) 
[ 28.329700][ T257] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 28.329872][ T257] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 28.330095][ T257] do_setlink (net/core/rtnetlink.c:2907) 
[ 28.330278][ T257] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 28.330460][ T257] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 28.330636][ T257] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 28.330811][ T257] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 28.330992][ T257] ? __kernel_text_address (kernel/extable.c:79) 
[ 28.331266][ T257] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 28.331447][ T257] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 28.331664][ T257] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 28.331854][ T257] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 28.332116][ T257] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 28.332294][ T257] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 28.332469][ T257] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 28.332611][ T257] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 28.332791][ T257] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 28.333060][ T257] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 28.333245][ T257] ? 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) 
[ 28.333433][ T257] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 28.333623][ T257] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 28.333931][ T257] ? __create_object (mm/kmemleak.c:751) 
[ 28.334116][ T257] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 28.334373][ T257] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 28.334566][ T257] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 28.334851][ T257] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 28.335029][ T257] ? 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) 
[ 28.335205][ T257] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 28.335377][ T257] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 28.335589][ T257] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 28.335993][ T257] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 28.336258][ T257] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 28.336557][ T257] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 28.336832][ T257] ? 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) 
[ 28.337117][ T257] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 28.337395][ T257] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 28.337666][ T257] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 28.337946][ T257] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 28.338386][ T257] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 28.338625][ T257] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 28.338905][ T257] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 28.339188][ T257] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 28.339465][ T257] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 28.339898][ T257] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 28.340233][ T257] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 28.340526][ T257] ___sys_sendmsg (net/socket.c:2653) 
[ 28.340802][ T257] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 28.341080][ T257] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 28.341355][ T257] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 28.341620][ T257] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 28.341956][ T257] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 28.342230][ T257] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 28.342508][ T257] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 28.342844][ T257] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 28.343124][ T257] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 28.343552][ T257] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 28.343822][ T257] ? __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) 
[ 28.344129][ T257] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 28.344404][ T257] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   28.344908][  T257] RIP: 0033:0x7f430a3787b7
[ 28.345186][ T257] 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)
[   28.346131][  T257] RSP: 002b:00007ffe6da28458 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   28.346541][  T257] RAX: ffffffffffffffda RBX: 00007ffe6da28b90 RCX: 00007f430a3787b7
[   28.346929][  T257] RDX: 0000000000000000 RSI: 00007ffe6da284c0 RDI: 0000000000000005
[   28.347603][  T257] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[   28.347966][  T257] R10: 000000003feed910 R11: 0000000000000246 R12: 0000000000000003


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