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: 3320 Comm: syzkaller631658 Not tainted 4.9.78-ge37256c #30 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801ccbb9800 task.stack: ffff8801c9430000 RIP: 0010:[] [] ip6_xmit+0xb25/0x1bd0 net/ipv6/ip6_output.c:254 RSP: 0018:ffff8801c94376c0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8801c9560140 RCX: ffffffff8341f2ab RDX: ffff8801c95601b8 RSI: ffffffff844de160 RDI: ffff8801d8254718 RBP: ffff8801c94378d8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d0778480 R13: 0000000000000001 R14: 0000000000000040 R15: ffff8801c0dc0064 FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008c21840 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002037ffc8 CR3: 00000001c9a04000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801c94376d0 ffffffff8107c736 ffff8801c9437710 ffffffff81235290 0001000300000001 0000000000000000 1ffff10039286ee6 ffff8801c9560208 ffff8801c9560198 ffff8801c95601b8 ffff8801cc3a8d00 ffff8801cfac4000 Call Trace: [] inet6_csk_xmit+0x27d/0x4d0 net/ipv6/inet6_connection_sock.c:178 [] l2tp_xmit_core net/l2tp/l2tp_core.c:1178 [inline] [] l2tp_xmit_skb+0xcdc/0xf50 net/l2tp/l2tp_core.c:1273 [] pppol2tp_sendmsg+0x5c0/0x7a0 net/l2tp/l2tp_ppp.c:339 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969 [] __sys_sendmsg+0xd6/0x190 net/socket.c:2003 [] C_SYSC_sendmsg net/compat.c:734 [inline] [] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:732 [] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline] [] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384 [] entry_SYSENTER_compat+0x74/0x83 arch/x86/entry/entry_64_compat.S:127 Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 45 0f 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+0xb25/0x1bd0 net/ipv6/ip6_output.c:254 RSP ---[ end trace 3d11573bd4884e16 ]--- Kernel panic - not syncing: Fatal exception in interrupt Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..