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: 1 PID: 14883 Comm: syz-executor6 Not tainted 4.9.124-g09eb2ba #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801a31c9800 task.stack: ffff8801a0d80000 RIP: 0010:[] [] ip6_xmit+0xb2d/0x1b80 net/ipv6/ip6_output.c:254 RSP: 0018:ffff8801a0d875e0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8801c1909dc0 RCX: ffffc900038cd000 RDX: ffff8801c1909e38 RSI: ffffffff83561613 RDI: ffff8801c78a6918 RBP: ffff8801a0d877f8 R08: ffffed00341b0ef2 R09: ffff8801a0d87750 R10: ffffed00341b0ef1 R11: 0000000000000003 R12: ffff8801c5638480 R13: ffff8801c4e844e6 R14: 000000000000001b R15: 0000000000000040 FS: 00007f6529330700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33821000 CR3: 00000001c3de7000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8153f4a2 ffffffff8153c8ab ffffffff8303637b ffffffff8304364f 0000001000000001 0000000000000000 1ffff100341b0eca ffff8801c1909e88 ffff8801c1909e18 ffff8801c1909e38 ffff88018f0e4100 ffff8801a59f0000 Call Trace: [] inet6_csk_xmit+0x27c/0x4d0 net/ipv6/inet6_connection_sock.c:178 [] l2tp_xmit_core net/l2tp/l2tp_core.c:1178 [inline] [] l2tp_xmit_skb+0xc45/0xf30 net/l2tp/l2tp_core.c:1273 [] pppol2tp_sendmsg+0x4e0/0x790 net/l2tp/l2tp_ppp.c:339 [] sock_sendmsg_nosec net/socket.c:648 [inline] [] sock_sendmsg+0xcc/0x110 net/socket.c:658 [] ___sys_sendmsg+0x47a/0x840 net/socket.c:1982 [] __sys_sendmmsg+0x161/0x3d0 net/socket.c:2072 [] SYSC_sendmmsg net/socket.c:2103 [inline] [] SyS_sendmmsg+0x35/0x60 net/socket.c:2098 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 55 0e 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 48 4d 8b a4 24 18 03 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+0xb2d/0x1b80 net/ipv6/ip6_output.c:254 RSP ---[ end trace 55a3c35129a5d49b ]---