------------[ cut here ]------------ kernel BUG at net/l2tp/l2tp_core.c:1405! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 6056 Comm: syz-executor3 Not tainted 4.9.88-gbb52bba #59 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801bf5bc800 task.stack: ffff8801bf7a8000 RIP: 0010:[] [] l2tp_tunnel_free+0xcd/0x110 net/l2tp/l2tp_core.c:1405 RSP: 0018:ffff8801bf7afb28 EFLAGS: 00010216 RAX: 0000000000010000 RBX: ffff8801c895ea00 RCX: ffffffff83582dcd RDX: 0000000000007c54 RSI: ffffc90001109000 RDI: ffff8801c895eb80 RBP: ffff8801bf7afb30 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c895ea00 R13: ffff8801c895ef08 R14: ffff8801ae8285c0 R15: 1ffff10037ef5f77 FS: 00007f62ba7bb700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a3eb48 CR3: 00000001c8056000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801c895ef00 ffff8801bf7afb60 ffffffff835880ed ffff8801c895ef00 ffff8801d7c93b80 00000000ffffffef ffff8801c895ea00 ffff8801bf7afd20 ffffffff8359087a ffff8801bf7afcb8 ffffffffd809a1b0 ffff880100000003 Call Trace: [] l2tp_tunnel_dec_refcount_1 net/l2tp/l2tp_core.c:141 [inline] [] l2tp_session_free+0x18d/0x200 net/l2tp/l2tp_core.c:1763 [] l2tp_session_dec_refcount_1 net/l2tp/l2tp_core.h:297 [inline] [] pppol2tp_connect+0x108a/0x18f0 net/l2tp/l2tp_ppp.c:783 [] SYSC_connect+0x1b6/0x310 net/socket.c:1562 [] SyS_connect+0x24/0x30 net/socket.c:1543 [] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: f6 83 f8 00 00 00 02 75 35 e8 70 8b de fd 48 8d 7b 10 be 10 00 00 00 e8 e2 fb d0 fd 5b 5d c3 e8 5a 8b de fd 0f 0b e8 53 8b de fd <0f> 0b e8 2c c0 fb fd e9 65 ff ff ff e8 22 c0 fb fd eb c2 [ 43.799541] RIP [] l2tp_tunnel_free+0xcd/0x110 net/l2tp/l2tp_core.c:1405 ---[ end trace d71371d176974ff3 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..