kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 5980 Comm: syz-executor7 Not tainted 4.16.0-rc2+ #247 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ip6_xmit+0xc16/0x2260 net/ipv6/ip6_output.c:264 RSP: 0018:ffff8801d39cf5a8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8801bdbc8040 RCX: ffffffff84ef8ebd RDX: 00000fe95013bcfe RSI: ffffc90001916000 RDI: 00007f4a809de7f0 RBP: ffff8801d39cf818 R08: 1ffff10037b79001 R09: ffff8801d39cf768 R10: ffff8801d39cf5a8 R11: ffffed003a739ef4 R12: 00007f4a809de520 R13: ffffed003a739eed R14: 0000000000000040 R15: ffff8801aa8622a4 FS: 00007fa0a36b2700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002047b000 CR3: 00000001b589c002 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139 l2tp_xmit_core net/l2tp/l2tp_core.c:1096 [inline] l2tp_xmit_skb+0x105f/0x1410 net/l2tp/l2tp_core.c:1191 pppol2tp_sendmsg+0x470/0x670 net/l2tp/l2tp_ppp.c:341 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xca/0x110 net/socket.c:639 SYSC_sendto+0x361/0x5c0 net/socket.c:1748 SyS_sendto+0x40/0x50 net/socket.c:1716 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453d69 RSP: 002b:00007fa0a36b1c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fa0a36b26d4 RCX: 0000000000453d69 RDX: 0000000000000fff RSI: 0000000020de7000 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000020000000 R09: 0000000000000000 R10: c3fe68eda9554f8b R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004c8 R14: 00000000006f7360 R15: 0000000000000000 Code: 4d 8b a4 24 18 01 00 00 4d 85 e4 74 67 e8 73 82 81 fc 49 8d bc 24 d0 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 13 00 00 48 8b 95 e0 fd ff ff 48 b8 00 00 RIP: ip6_xmit+0xc16/0x2260 net/ipv6/ip6_output.c:264 RSP: ffff8801d39cf5a8 ---[ end trace 3a3658d90c364f51 ]--- Kernel panic - not syncing: Fatal exception in interrupt Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..