IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready ip (3818) used greatest stack depth: 23584 bytes left IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready hrtimer: interrupt took 18790 ns BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 IP: [] sock_hold include/net/sock.h:589 [inline] IP: [] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809 PGD 1d8329067 PUD 1d82fa067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 4128 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800b9f83000 task.stack: ffff8801d7e78000 RIP: 0010:[] [] sock_hold include/net/sock.h:589 [inline] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809 RSP: 0018:ffff8801d7e7fad0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8800b9880000 RCX: 0000000000000006 RDX: 1ffff10017310030 RSI: ffffffff835a4543 RDI: ffff8800b9880180 RBP: ffff8801d7e7fb40 R08: ffff8800b9f83900 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da3d8aa8 R13: ffff8801d7e7fc58 R14: ffff8801da3d8a00 R15: ffffffff835a3170 FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f775ab40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000001d8330000 CR4: 00000000001606f0 Stack: ffffffff81140a6a ffff8800b9880020 ffff8801da3d8b58 ffff8801da3d8a10 ffffffff838cba90 ffff8801da3d8ab0 ffff8801da3d8b50 ffff8800b98800e0 ffffffff00000000 ffff8800ba786600 0000000000000000 ffff8800ba786630 Call Trace: [] pppol2tp_connect+0x10f0/0x1910 net/l2tp/l2tp_ppp.c:725 [] SYSC_connect+0x1b8/0x300 net/socket.c:1558 [] SyS_connect+0x24/0x30 net/socket.c:1539 [] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline] [] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460 [] sysenter_flags_fixed+0xd/0x1a Code: 00 00 48 8d bb 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 36 06 00 00 48 8b 83 80 01 00 00 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 RIP [] sock_hold include/net/sock.h:589 [inline] RIP [] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809 RSP CR2: 0000000000000080 ---[ end trace 78394a5a08f12ae7 ]---