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: 20839 Comm: syz-executor2 Not tainted 4.9.124-g09eb2ba #35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801a3520000 task.stack: ffff8801d41b8000 RIP: 0010:[] [] ip6_xmit+0xb2d/0x1b80 net/ipv6/ip6_output.c:254 RSP: 0018:ffff8801d41bf5d0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff880188fc8500 RCX: ffffc900084c7000 RDX: ffff880188fc8578 RSI: ffffffff83561613 RDI: ffff8801a5df2518 RBP: ffff8801d41bf7e8 R08: ffffed003a837ef0 R09: ffff8801d41bf740 R10: ffffed003a837eef R11: 0000000000000003 R12: ffff8801bbb56d00 R13: ffff8801bbbf8064 R14: 000000000000001b R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f5749b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000205fafd2 CR3: 00000001a418e000 CR4: 00000000001606f0 Stack: ffffffff8153f4a2 ffffffff8153c8ab ffffffff8303637b ffffffff8304364f 0000001200000001 0000000000000000 1ffff1003a837ec8 ffff880188fc85c8 ffff880188fc8558 ffff880188fc8578 ffff8801d7b48000 ffff8801aa59cd40 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 cde8beeb8989c3d6 ]---