======================================
| [   14.646637] #0: ffff8b6343954660 (nlk_cb_mutex-ROUTE){+.+.}-{3:3}, at: __netlink_dump_start (net/netlink/af_netlink.c:2342) 
| [   14.647159] #1: ffffffff8f97b8c0 (rcu_read_lock){....}-{1:2}, at: inet_dump_fib (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/ipv4/fib_frontend.c:1003) 
| [   14.647597]
| [   14.647597] stack backtrace:
[   14.648164] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   14.648745] Call Trace:
[   14.648879]  <TASK>
[   14.649003] dump_stack_lvl (lib/dump_stack.c:107) 
[   14.649200] lockdep_rcu_suspicious (./include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6713) 
[   14.649444] fib_dump_info (./include/net/nexthop.h:320 net/ipv4/fib_semantics.c:1750 net/ipv4/fib_semantics.c:1850) 
[   14.649648] fib_table_dump (net/ipv4/fib_trie.c:2328 net/ipv4/fib_trie.c:2376) 
[   14.649856] inet_dump_fib (net/ipv4/fib_frontend.c:1028) 
[   14.650059] netlink_dump (net/netlink/af_netlink.c:2268) 
[   14.650260] __netlink_dump_start (./include/net/sock.h:1974 net/netlink/af_netlink.c:2378) 
[   14.650491] rtnetlink_rcv_msg (net/core/rtnetlink.c:6560) 
[   14.650708] ? __pfx_inet_dump_fib (net/ipv4/fib_frontend.c:989) 
[   14.650935] ? __pfx_inet_dump_fib (net/ipv4/fib_frontend.c:989) 
[   14.651163] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6494) 
[   14.651405] netlink_rcv_skb (net/netlink/af_netlink.c:2549) 
[   14.651631] netlink_unicast (net/netlink/af_netlink.c:1337 net/netlink/af_netlink.c:1363) 
[   14.651840] netlink_sendmsg (net/netlink/af_netlink.c:1904) 
[   14.652049] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[   14.652311] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[   14.652619] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1366) 
[   14.652950] ? lock_release (kernel/locking/lockdep.c:5430 kernel/locking/lockdep.c:5774) 
[   14.653245] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1366) 
[   14.653572] __x64_sys_sendto (net/socket.c:2203 net/socket.c:2199 net/socket.c:2199) 
[   14.653860] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
DETECTED CRASH, lowering timeout
e0
[   14.654149] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   14.654533] RIP: 0033:0x7f7459614700
[ 14.654774] Code: ff ff 64 89 02 eb bd 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 1d 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 68 c3 0f 1f 80 00 00 00 00 41 54 48 83 ec 20
All code
========
   0:	ff                   	(bad)
   1:	ff 64 89 02          	jmp    *0x2(%rcx,%rcx,4)
   5:	eb bd                	jmp    0xffffffffffffffc4
   7:	0f 1f 00             	nopl   (%rax)
   a:	f3 0f 1e fa          	endbr64
   e:	41 89 ca             	mov    %ecx,%r10d
  11:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  18:	00 
  19:	85 c0                	test   %eax,%eax
  1b:	75 1d                	jne    0x3a
  1d:	45 31 c9             	xor    %r9d,%r9d
  20:	45 31 c0             	xor    %r8d,%r8d
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 68                	ja     0x9a
  32:	c3                   	ret
  33:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3a:	41 54                	push   %r12
  3c:	48 83 ec 20          	sub    $0x20,%rsp

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 68                	ja     0x70
   8:	c3                   	ret
   9:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  10:	41 54                	push   %r12
  12:	48 83 ec 20          	sub    $0x20,%rsp
[   14.655724] RSP: 002b:00007ffde2284ba8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   14.656190] RAX: ffffffffffffffda RBX: 0000000000495540 RCX: 00007f7459614700
[   14.656708] RDX: 000000000000009c RSI: 00007ffde2284bb0 RDI: 0000000000000005
[   14.657232] RBP: 00007ffde2284bb0 R08: 0000000000000000 R09: 0000000000000000
[   14.657756] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffde2284eb8


Finger prints:
dump_stack_lvl:lockdep_rcu_suspicious:fib_dump_info:fib_table_dump