======================================
| [   27.309763][  T264] 1 lock held by ip/264:
| [ 27.309895][ T264] #0: ffffffff92dd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   27.310481][  T264]
| [   27.310481][  T264] stack backtrace:
[   27.311015][  T264] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.311430][  T264] Call Trace:
[   27.311580][  T264]  <TASK>
[ 27.311685][ T264] dump_stack_lvl (lib/dump_stack.c:122) 
[ 27.311875][ T264] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 27.312065][ T264] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) 
[ 27.312257][ T264] br_get_link_af_size_filtered (net/bridge/br_private.h:930 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 27.312497][ T264] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 27.312682][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 27.312918][ T264] br_add_if (net/bridge/br_if.c:692) 
[ 27.313064][ T264] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 27.313263][ T264] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 27.313522][ T264] do_setlink (net/core/rtnetlink.c:2907) 
[ 27.313716][ T264] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 27.313913][ T264] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 27.314096][ T264] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 27.314287][ T264] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 27.314476][ T264] ? __kernel_text_address (kernel/extable.c:79) 
[ 27.314667][ T264] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 27.314861][ T264] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 27.315095][ T264] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 27.315298][ T264] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 27.315483][ T264] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 27.315688][ T264] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 27.315873][ T264] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 27.316018][ T264] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 27.316214][ T264] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 27.316411][ T264] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 27.316605][ T264] ? 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) 
[ 27.316791][ T264] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 27.316987][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 27.317215][ T264] ? __create_object (mm/kmemleak.c:751) 
[ 27.317414][ T264] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 27.317609][ T264] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 27.317769][ T264] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 27.317968][ T264] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 27.318154][ T264] ? 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) 
[ 27.318336][ T264] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 27.318493][ T264] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 27.318678][ T264] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 27.318865][ T264] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 27.319053][ T264] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 27.319255][ T264] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 27.319458][ T264] ? 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) 
[ 27.319646][ T264] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 27.319845][ T264] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 27.320029][ T264] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 27.320235][ T264] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 27.320420][ T264] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 27.320599][ T264] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 27.320791][ T264] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 27.320987][ T264] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 27.321177][ T264] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 27.321366][ T264] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 27.321592][ T264] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 27.321791][ T264] ___sys_sendmsg (net/socket.c:2653) 
[ 27.321977][ T264] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 27.322159][ T264] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 27.322341][ T264] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 27.322523][ T264] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 27.322752][ T264] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 27.322939][ T264] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 27.323127][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 27.323357][ T264] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 27.323545][ T264] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 27.323729][ T264] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 27.323912][ T264] ? __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) 
[ 27.324118][ T264] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.324304][ T264] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.324532][  T264] RIP: 0033:0x7f645555f7b7
[ 27.324723][ T264] 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)
[   27.325360][  T264] RSP: 002b:00007ffd3d07fbf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   27.325638][  T264] RAX: ffffffffffffffda RBX: 00007ffd3d080320 RCX: 00007f645555f7b7
[   27.325913][  T264] RDX: 0000000000000000 RSI: 00007ffd3d07fc60 RDI: 0000000000000005
[   27.326183][  T264] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[   27.326449][  T264] R10: 000000000ca2d910 R11: 0000000000000246 R12: 0000000000000004
[   27.326727][  T264] R13: 0000000066bea3bc R14: 0000000000496600 R15: 0000000000000000
| [   27.328852][  T264] 1 lock held by ip/264:
| [ 27.329015][ T264] #0: ffffffff92dd2948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg (net/core/rtnetlink.c:6645) 
| [   27.329359][  T264]
| [   27.329359][  T264] stack backtrace:
[   27.329867][  T264] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.330242][  T264] Call Trace:
[   27.330374][  T264]  <TASK>
[ 27.330466][ T264] dump_stack_lvl (lib/dump_stack.c:122) 
[ 27.330644][ T264] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6725) 
[ 27.330818][ T264] br_get_link_af_size_filtered (net/bridge/br_private.h:453 net/bridge/br_private.h:940 net/bridge/br_netlink.c:105) 
[ 27.331043][ T264] br_info_notify (./include/linux/skbuff.h:1320 ./include/net/netlink.h:1015 net/bridge/br_netlink.c:645) 
[ 27.331216][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 27.331438][ T264] br_add_if (net/bridge/br_if.c:692) 
[ 27.331574][ T264] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 27.331744][ T264] ? netdev_master_upper_dev_get (net/core/dev.c:7102) 
[ 27.331970][ T264] do_setlink (net/core/rtnetlink.c:2907) 
[ 27.332144][ T264] ? is_bpf_text_address (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./kernel/bpf/core.c:769) 
[ 27.332315][ T264] ? __pfx_do_setlink (net/core/rtnetlink.c:2778) 
[ 27.332491][ T264] ? is_bpf_text_address (./kernel/bpf/core.c:772) 
[ 27.332664][ T264] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 27.332837][ T264] ? __kernel_text_address (kernel/extable.c:79) 
[ 27.333006][ T264] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 27.333175][ T264] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 27.333393][ T264] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 27.333578][ T264] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 27.333748][ T264] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 27.333923][ T264] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 27.334096][ T264] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 27.334228][ T264] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 27.334402][ T264] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 27.334576][ T264] __rtnl_newlink (net/core/rtnetlink.c:3696) 
[ 27.334755][ T264] ? 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) 
[ 27.334931][ T264] ? __pfx___rtnl_newlink (net/core/rtnetlink.c:3557) 
[ 27.335108][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 27.335321][ T264] ? __create_object (mm/kmemleak.c:751) 
[ 27.335495][ T264] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 52)) 
[ 27.335676][ T264] rtnl_newlink (net/core/rtnetlink.c:3744) 
[ 27.335806][ T264] rtnetlink_rcv_msg (net/core/rtnetlink.c:6647) 
[ 27.335980][ T264] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 27.336148][ T264] ? 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) 
[ 27.336323][ T264] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 27.336455][ T264] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 27.336627][ T264] netlink_rcv_skb (net/netlink/af_netlink.c:2550) 
[ 27.336802][ T264] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6541) 
[ 27.336984][ T264] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2527) 
[ 27.337185][ T264] ? netlink_deliver_tap (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/netlink/af_netlink.c:340) 
[ 27.337369][ T264] ? 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) 
[ 27.337555][ T264] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 27.337739][ T264] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 27.337916][ T264] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 27.338090][ T264] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 27.338269][ T264] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 27.338436][ T264] ? __might_fault (mm/memory.c:6388 mm/memory.c:6381) 
[ 27.338618][ T264] ? __import_iovec (lib/iov_iter.c:1263 lib/iov_iter.c:1279) 
[ 27.338798][ T264] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2597) 
[ 27.338981][ T264] ? __pfx_____sys_sendmsg (net/socket.c:2543) 
[ 27.339150][ T264] ? __pfx_copy_msghdr_from_user (net/socket.c:2523) 
[ 27.339362][ T264] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 27.339542][ T264] ___sys_sendmsg (net/socket.c:2653) 
[ 27.339721][ T264] ? __pfx____sys_sendmsg (net/socket.c:2640) 
[ 27.339895][ T264] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 27.340071][ T264] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 27.340242][ T264] ? __debug_check_no_obj_freed (lib/debugobjects.c:1001) 
[ 27.340462][ T264] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 27.340637][ T264] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 27.340815][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 27.341036][ T264] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 27.341215][ T264] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2682) 
[ 27.341385][ T264] ? __pfx___sys_sendmsg (net/socket.c:2668) 
[ 27.341550][ T264] ? __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) 
[ 27.341741][ T264] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 27.341921][ T264] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.342130][  T264] RIP: 0033:0x7f645555f7b7
[ 27.342312][ T264] 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)
[   27.343060][  T264] RSP: 002b:00007ffd3d07fbf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   27.343410][  T264] RAX: ffffffffffffffda RBX: 00007ffd3d080320 RCX: 00007f645555f7b7
[   27.343667][  T264] RDX: 0000000000000000 RSI: 00007ffd3d07fc60 RDI: 0000000000000005
[   27.343926][  T264] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[   27.344263][  T264] R10: 000000000ca2d910 R11: 0000000000000246 R12: 0000000000000004


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