nla_parse: 2 callbacks suppressed
netlink: 20 bytes leftover after parsing attributes in process `syz-executor4'.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 12729 Comm: syz-executor3 Not tainted 4.9.113-g90e7a90 #68
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b52b3000 task.stack: ffff8801a59f8000
RIP: 0010:[<ffffffff835033d3>]  [<ffffffff835033d3>] xfrm_policy_ok net/xfrm/xfrm_policy.c:2410 [inline]
RIP: 0010:[<ffffffff835033d3>]  [<ffffffff835033d3>] __xfrm_policy_check+0xc93/0x1b20 net/xfrm/xfrm_policy.c:2586
RSP: 0018:ffff8801db2075d8  EFLAGS: 00010202
RAX: 03fffe20076c81e4 RBX: 1ffff1003b640ef2 RCX: ffff8801b52b3000
RDX: 0000000000000004 RSI: ffffffff835033a2 RDI: 1ffff1003b640f24
RBP: ffff8801db207820 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801db207718 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f9b34001700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020dcd000 CR3: 00000001ccaa6000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8350287f ffff8801db207678 ffff8801db207710 0000000200000001
 ffff880100000000 ffff8801cb0692e8 000000c700029350 ffff8801db207718
 ffff8801d9b81b00 ffff880100000002 1ffff1003b640ecb ffff8801db207778
Call Trace:
 <IRQ> 
 [<ffffffff83400ad3>] __xfrm_policy_check2 include/net/xfrm.h:1067 [inline]
 [<ffffffff83400ad3>] xfrm_policy_check include/net/xfrm.h:1072 [inline]
 [<ffffffff83400ad3>] xfrm4_policy_check include/net/xfrm.h:1077 [inline]
 [<ffffffff83400ad3>] __udp4_lib_rcv+0x21c3/0x2b10 net/ipv4/udp.c:1812
 [<ffffffff834024b1>] udp_rcv+0x21/0x30 net/ipv4/udp.c:1972
 [<ffffffff83324007>] ip_local_deliver_finish+0x257/0xa60 net/ipv4/ip_input.c:216
 [<ffffffff833269f9>] NF_HOOK_THRESH include/linux/netfilter.h:232 [inline]
 [<ffffffff833269f9>] NF_HOOK include/linux/netfilter.h:255 [inline]
 [<ffffffff833269f9>] ip_local_deliver+0x389/0x4d0 net/ipv4/ip_input.c:257
 [<ffffffff83324ee6>] dst_input include/net/dst.h:513 [inline]
 [<ffffffff83324ee6>] ip_rcv_finish+0x6d6/0x1920 net/ipv4/ip_input.c:396
 [<ffffffff8332764b>] NF_HOOK_THRESH include/linux/netfilter.h:232 [inline]
 [<ffffffff8332764b>] NF_HOOK include/linux/netfilter.h:255 [inline]
 [<ffffffff8332764b>] ip_rcv+0xb0b/0x1370 net/ipv4/ip_input.c:487
 [<ffffffff8307d100>] __netif_receive_skb_core+0x12a0/0x2a20 net/core/dev.c:4267
 [<ffffffff8307e8db>] __netif_receive_skb+0x5b/0x1b0 net/core/dev.c:4305
 [<ffffffff8307ec36>] process_backlog+0x206/0x6a0 net/core/dev.c:4926
 [<ffffffff83084c94>] napi_poll net/core/dev.c:5227 [inline]
 [<ffffffff83084c94>] net_rx_action+0x3c4/0xde0 net/core/dev.c:5292
 [<ffffffff83a01d7b>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff839fc19c>] do_softirq_own_stack+0x1c/0x30 arch/x86/entry/entry_64.S:843
 <EOI> 
 [<ffffffff81149869>] do_softirq.part.14+0x99/0xb0 kernel/softirq.c:328
 [<ffffffff81149946>] do_softirq arch/x86/include/asm/preempt.h:22 [inline]
 [<ffffffff81149946>] __local_bh_enable_ip+0xc6/0xd0 kernel/softirq.c:181
 [<ffffffff836c9096>] local_bh_enable include/linux/bottom_half.h:31 [inline]
 [<ffffffff836c9096>] pppol2tp_sendmsg+0x4f6/0x790 net/l2tp/l2tp_ppp.c:340
 [<ffffffff83017fcc>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff83017fcc>] sock_sendmsg+0xcc/0x110 net/socket.c:645
 [<ffffffff830197ea>] ___sys_sendmsg+0x47a/0x840 net/socket.c:1969
 [<ffffffff8301bd41>] __sys_sendmmsg+0x161/0x3d0 net/socket.c:2059
 [<ffffffff8301bfe5>] SYSC_sendmmsg net/socket.c:2090 [inline]
 [<ffffffff8301bfe5>] SyS_sendmmsg+0x35/0x60 net/socket.c:2085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fb193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: ff 48 c1 e8 03 42 80 3c 30 00 0f 85 52 0c 00 00 48 8b 85 f0 fd ff ff 48 8b 18 48 8d 7b 32 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 30 38 d0 7f 08 84 c0 0f 85 bd 0c 00 00 0f b6 43 32 
RIP  [<ffffffff835033d3>] xfrm_policy_ok net/xfrm/xfrm_policy.c:2410 [inline]
RIP  [<ffffffff835033d3>] __xfrm_policy_check+0xc93/0x1b20 net/xfrm/xfrm_policy.c:2586
 RSP <ffff8801db2075d8>
---[ end trace d464b8eae7a8f1c0 ]---