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: 21117 Comm: syz-executor7 Not tainted 4.9.124-g09eb2ba #35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d7886000 task.stack: ffff8801a3d98000 RIP: 0010:[] [] ip6_xmit+0xb2d/0x1b80 net/ipv6/ip6_output.c:254 RSP: 0018:ffff8801a3d9f5d0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8801c13c7640 RCX: ffffc90003ad2000 RDX: ffff8801c13c76b8 RSI: ffffffff83561613 RDI: ffff8801a67ed818 RBP: ffff8801a3d9f7e8 R08: ffffed00347b3ef0 R09: ffff8801a3d9f740 R10: ffffed00347b3eef R11: 0000000000000003 R12: ffff8801d48ef180 R13: ffff8801d006d266 R14: 000000000000001b R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f5758b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fd0871f02e6 CR3: 00000001d688a000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8153f4a2 ffffffff8153c8ab ffffffff8303637b ffffffff8304364f 0000001000000001 0000000000000000 1ffff100347b3ec8 ffff8801c13c7708 ffff8801c13c7698 ffff8801c13c76b8 ffff8801a2161a00 ffff8801ad5919c0 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+0x23c/0x3d0 net/socket.c:2065 [] C_SYSC_sendmmsg net/compat.c:742 [inline] [] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:739 [] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] [] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387 [] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 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 311fede922641e41 ]---