======================================
| [   26.139702][  T252] other info that might help us debug this:
| [   26.139886][  T252] no locks held by ip/252.
| [   26.140015][  T252]
| [   26.140015][  T252] stack backtrace:
[   26.140371][  T252] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   26.140652][  T252] Call Trace:
[   26.140752][  T252]  <TASK>
[ 26.140818][ T252] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.140950][ T252] ? __rtnl_unlock (net/core/rtnetlink.c:140 (discriminator 3)) 
[ 26.141078][ T252] print_unlock_imbalance_bug (kernel/locking/lockdep.c:5266) 
[ 26.141213][ T252] __lock_release (kernel/locking/lockdep.c:5502) 
[ 26.141340][ T252] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.141468][ T252] ? __rtnl_unlock (net/core/rtnetlink.c:140 (discriminator 3)) 
[ 26.141595][ T252] lock_release (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5848) 
[ 26.141722][ T252] __mutex_unlock_slowpath (./include/linux/instrumented.h:68 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.c:921) 
[ 26.141852][ T252] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 26.141978][ T252] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:907) 
[ 26.142138][ T252] ? rtnl_link_ops_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:558) 
[ 26.142270][ T252] __rtnl_unlock (net/core/rtnetlink.c:140 (discriminator 3)) 
[ 26.142397][ T252] rtnl_newlink (net/core/rtnetlink.c:3961) 
[ 26.142527][ T252] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3919) 
[ 26.142653][ T252] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.142782][ T252] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.142909][ T252] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6926) 
[ 26.143034][ T252] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 26.143163][ T252] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6926) 
[ 26.143293][ T252] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3919) 
[ 26.143418][ T252] rtnetlink_rcv_msg (net/core/rtnetlink.c:6928) 
[ 26.143546][ T252] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6831) 
[ 26.143672][ T252] ? 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:228) 
[ 26.143797][ T252] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 26.143902][ T252] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.144030][ T252] netlink_rcv_skb (net/netlink/af_netlink.c:2536) 
[ 26.144160][ T252] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6831) 
[ 26.144290][ T252] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2513) 
[ 26.144426][ T252] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 26.144556][ T252] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 26.144686][ T252] netlink_unicast (net/netlink/af_netlink.c:1316 net/netlink/af_netlink.c:1342) 
[ 26.144820][ T252] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1327) 
[ 26.144947][ T252] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.145075][ T252] netlink_sendmsg (net/netlink/af_netlink.c:1886) 
[ 26.145202][ T252] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1805) 
[ 26.145335][ T252] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2609) 
[ 26.145463][ T252] ? __pfx_____sys_sendmsg (net/socket.c:2555) 
[ 26.145591][ T252] ? __pfx_copy_msghdr_from_user (net/socket.c:2535) 
[ 26.145749][ T252] ? 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:228) 
[ 26.145880][ T252] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3794 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 26.146006][ T252] ___sys_sendmsg (net/socket.c:2665) 
[ 26.146136][ T252] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 26.146264][ T252] ? __pfx____sys_sendmsg (net/socket.c:2652) 
[ 26.146399][ T252] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 26.146528][ T252] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 26.146657][ T252] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 26.146784][ T252] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 26.146914][ T252] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1114 fs/file.c:1128) 
[ 26.147012][ T252] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 26.147143][ T252] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2694) 
[ 26.147270][ T252] ? __pfx___sys_sendmsg (net/socket.c:2680) 
[ 26.147397][ T252] ? rseq_update_cpu_node_id (kernel/rseq.c:109 (discriminator 10)) 
[ 26.147532][ T252] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.147659][ T252] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.147821][  T252] RIP: 0033:0x7efce3a3a7b7
[ 26.147954][ T252] 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)
[   26.148405][  T252] RSP: 002b:00007ffd3cf9bb68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   26.148600][  T252] RAX: ffffffffffffffda RBX: 00007ffd3cf9c290 RCX: 00007efce3a3a7b7
[   26.148792][  T252] RDX: 0000000000000000 RSI: 00007ffd3cf9bbd0 RDI: 0000000000000005
[   26.148981][  T252] RBP: 0000000000000008 R08: 0000000000000068 R09: 0000000000000000
[   26.149169][  T252] R10: 00007efce3a89ac0 R11: 0000000000000246 R12: 00007ffd3cf9c2a8


Finger prints:
print_unlock_imbalance_bug:__lock_release:lock_release:__mutex_unlock_slowpath:__rtnl_unlock