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: 10094 Comm: syz-executor4 Not tainted 4.16.0-rc5+ #354 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ip6_xmit+0xc39/0x2260 net/ipv6/ip6_output.c:264 RSP: 0018:ffff8801aceb7438 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8801bd8e51c0 RCX: ffffffff84ef5ccd RDX: ffff8801bd8e5240 RSI: ffffc90004673000 RDI: ffffffff8165f1c2 RBP: ffff8801aceb76a8 R08: 1ffff10037b1ca01 R09: ffff8801aceb75f8 R10: ffff8801aceb7438 R11: ffffed00359d6ec6 R12: 8d4cffffffffbfe2 R13: ffffed00359d6ebf R14: 0000000000000040 R15: ffff8801d96a92e4 FS: 00007febce64f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000072c000 CR3: 00000001d281c003 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:1053 [inline] l2tp_xmit_skb+0x105f/0x1410 net/l2tp/l2tp_core.c:1148 pppol2tp_sendmsg+0x470/0x670 net/l2tp/l2tp_ppp.c:341 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 SYSC_sendmsg net/socket.c:2091 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2087 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007febce64ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007febce64f6d4 RCX: 0000000000453e69 RDX: 000000000000c045 RSI: 0000000020002540 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004bd R14: 00000000006f7258 R15: 0000000000000000 Code: 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 00 00 00 fc ff df 4d 8b a4 24 d0 02 00 00 <65> 49 ff 44 24 28 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f RIP: ip6_xmit+0xc39/0x2260 net/ipv6/ip6_output.c:264 RSP: ffff8801aceb7438 ---[ end trace 48368f568861788a ]--- Kernel panic - not syncing: Fatal exception in interrupt Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..