======================================
| [ 1596.661067] #PF: supervisor read access in kernel mode
| [ 1596.661096] #PF: error_code(0x0000) - not-present page
| [ 1596.661124] PGD 5c86067 P4D e6ed067 PUD 6ca6067 PMD 0
| [ 1596.661153] Oops: Oops: 0000 [#1] SMP
[ 1596.661221] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1596.661262] RIP: 0010:l2tp_eth_create (net/l2tp/l2tp_core.h:341 net/l2tp/l2tp_core.h:346 net/l2tp/l2tp_eth.c:202 net/l2tp/l2tp_eth.c:250) l2tp_eth
[ 1596.661290] Code: 00 00 ff ff 00 00 48 89 85 18 02 00 00 41 8b 74 24 3c 85 f6 0f 84 a2 00 00 00 48 8b 53 20 0f b7 43 4a 4d 8b ac 24 b8 00 00 00 <8b> 4a 54 03 42 3c 31 d2 85 c9 0f 94 c2 44 8d 74 d0 0e e8 37 61 d2
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	ff                   	(bad)
   3:	ff 00                	incl   (%rax)
   5:	00 48 89             	add    %cl,-0x77(%rax)
   8:	85 18                	test   %ebx,(%rax)
   a:	02 00                	add    (%rax),%al
   c:	00 41 8b             	add    %al,-0x75(%rcx)
   f:	74 24                	je     0x35
  11:	3c 85                	cmp    $0x85,%al
  13:	f6 0f 84             	testb  $0x84,(%rdi)
  16:	a2 00 00 00 48 8b 53 	movabs %al,0xf20538b48000000
  1d:	20 0f 
  1f:	b7 43                	mov    $0x43,%bh
  21:	4a                   	rex.WX
  22:	4d 8b ac 24 b8 00 00 	mov    0xb8(%r12),%r13
  29:	00 
  2a:*	8b 4a 54             	mov    0x54(%rdx),%ecx		<-- trapping instruction
  2d:	03 42 3c             	add    0x3c(%rdx),%eax
  30:	31 d2                	xor    %edx,%edx
  32:	85 c9                	test   %ecx,%ecx
  34:	0f 94 c2             	sete   %dl
  37:	44 8d 74 d0 0e       	lea    0xe(%rax,%rdx,8),%r14d
  3c:	e8                   	.byte 0xe8
  3d:	37                   	(bad)
  3e:	61                   	(bad)
  3f:	d2                   	.byte 0xd2

Code starting with the faulting instruction
===========================================
   0:	8b 4a 54             	mov    0x54(%rdx),%ecx
   3:	03 42 3c             	add    0x3c(%rdx),%eax
   6:	31 d2                	xor    %edx,%edx
   8:	85 c9                	test   %ecx,%ecx
   a:	0f 94 c2             	sete   %dl
   d:	44 8d 74 d0 0e       	lea    0xe(%rax,%rdx,8),%r14d
  12:	e8                   	.byte 0xe8
  13:	37                   	(bad)
  14:	61                   	(bad)
  15:	d2                   	.byte 0xd2
[ 1596.661377] RSP: 0018:ff5bd9a88128f8f8 EFLAGS: 00010206
[ 1596.661407] RAX: 0000000000000008 RBX: ff1108d94e291400 RCX: 0000000000000005
[ 1596.661445] RDX: 0000000000000000 RSI: 0000000000000014 RDI: 7f7f7fffffffffff
[ 1596.661483] RBP: ff1108d9479ec000 R08: 8080808080808080 R09: ff1108d9479ec120
[ 1596.661530] R10: ff5bd9a88128f900 R11: fefefefefefefeff R12: ff1108d942fb0c00
[ 1596.661576] R13: ff1108d941943300 R14: 0000000000000411 R15: 0000000000000000
[ 1596.661614] FS:  00007f6ca7aab400(0000) GS:ff1108d9e4b34000(0000) knlGS:0000000000000000
[ 1596.661657] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1596.661699] CR2: 0000000000000054 CR3: 0000000008bdb005 CR4: 0000000000771ef0
[ 1596.661735] PKRU: 55555554
[ 1596.661749] Call Trace:
[ 1596.661766]  <TASK>
[ 1596.661783] l2tp_nl_cmd_session_create (net/l2tp/l2tp_netlink.c:644) l2tp_netlink
[ 1596.661818]  genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114)
[ 1596.661852]  genl_rcv_msg (net/netlink/genetlink.c:1194 net/netlink/genetlink.c:1209)
[ 1596.661873]  ? l2tp_session_notify.constprop.0 (net/l2tp/l2tp_netlink.c:529) l2tp_netlink
[ 1596.661910]  ? genl_family_rcv_msg_dumpit (net/netlink/genetlink.c:1200)
[ 1596.661941]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[ 1596.661963]  genl_rcv (net/netlink/genetlink.c:1219)
[ 1596.661984]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[ 1596.662005]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[ 1596.662028]  ____sys_sendmsg (net/socket.c:727 (discriminator 4) net/socket.c:742 (discriminator 4) net/socket.c:2592 (discriminator 4))
[ 1596.662057]  ___sys_sendmsg (net/socket.c:2648)
[ 1596.662081]  __sys_sendmsg (net/socket.c:2678 (discriminator 1))
[ 1596.662105]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[ 1596.662128]  ? exc_page_fault (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:114 arch/x86/mm/fault.c:1480 arch/x86/mm/fault.c:1527)
[ 1596.662152]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1596.662184] RIP: 0033:0x7f6ca7c05c5e
[ 1596.662207] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 34 bd 00 00       	call   0xbd3c
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 13 ff ff ff       	call   0xffffffffffffff4c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 13 ff ff ff       	call   0xffffffffffffff22
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[ 1596.662311] RSP: 002b:00007ffd1435f870 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[ 1596.662348] RAX: ffffffffffffffda RBX: 00007ffd1435fc30 RCX: 00007f6ca7c05c5e
[ 1596.662384] RDX: 0000000000000000 RSI: 00007ffd1435f930 RDI: 0000000000000006
[ 1596.662429] RBP: 00007ffd1435f880 R08: 0000000000000000 R09: 0000000000000000
[ 1596.662468] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001


Finger prints:
l2tp_eth_create:l2tp_nl_cmd_session_create:genl_family_rcv_msg_doit:genl_rcv_msg:netlink_rcv_skb