[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.109747] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.132180] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 25.421103] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.243735] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) [ 42.124236] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 47.664534] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) 2018/08/22 22:22:44 parsed 1 programs [ 48.703825] random: cc1: uninitialized urandom read (8 bytes read, 91 bits of entropy available) 2018/08/22 22:22:46 executed programs: 0 [ 50.110752] IPVS: Creating netns size=2552 id=1 [ 50.350497] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 50.365262] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 50.451558] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 50.465666] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 50.545776] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 50.561062] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 50.577997] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 50.595309] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 50.639278] ip (3966) used greatest stack depth: 23600 bytes left [ 51.321023] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 51.358963] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 54.298071] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 54.306321] IP: [] l2tp_session_create+0x948/0x1030 [ 54.313019] PGD b2564067 PUD b2555067 PMD 0 [ 54.317773] Oops: 0002 [#1] PREEMPT SMP KASAN [ 54.322730] Dumping ftrace buffer: [ 54.326247] (ftrace buffer empty) [ 54.329936] Modules linked in: [ 54.333219] CPU: 0 PID: 5137 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 54.340820] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.350148] task: ffff8800ae183000 task.stack: ffff8800b6e90000 [ 54.356195] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 54.365305] RSP: 0018:ffff8800b6e97b48 EFLAGS: 00010246 [ 54.370726] RAX: 0000000000000000 RBX: ffff8801d0c25b80 RCX: 0000000000000006 [ 54.378005] RDX: 1ffff1003a184ba0 RSI: ffffffff835a4543 RDI: ffff8801d0c25d00 [ 54.385254] RBP: ffff8800b6e97bb8 R08: ffff8800ae183900 R09: 0000000000000000 [ 54.392502] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b5d8b728 [ 54.399746] R13: ffff8800b6e97cd0 R14: ffff8800b5d8b680 R15: ffffffff835a3170 [ 54.406994] FS: 00007f799763b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 54.415192] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 54.421048] CR2: 0000000000000080 CR3: 00000000b2594000 CR4: 00000000001606f0 [ 54.428318] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.435564] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.442805] Stack: [ 54.444927] ffffffff81140a6a ffff8801d0c25ba0 ffff8800b5d8b7d8 ffff8800b5d8b690 [ 54.452947] ffffffff838cba90 ffff8800b5d8b730 ffff8800b5d8b7d0 ffff8801d0c25c60 [ 54.460940] ffffffff00000000 ffff8801cd87bb80 0000000000000000 ffff8801cd87bbb0 [ 54.468964] Call Trace: [ 54.471530] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 54.477830] [] ? _raw_read_unlock_bh+0x30/0x40 [ 54.484042] [] pppol2tp_connect+0x10f0/0x1910 [ 54.490164] [] ? pppol2tp_recv+0x320/0x320 [ 54.496050] [] ? security_socket_connect+0x8f/0xc0 [ 54.502619] [] SYSC_connect+0x1b8/0x300 [ 54.508221] [] ? SYSC_bind+0x280/0x280 [ 54.513743] [] ? get_unused_fd_flags+0xd0/0xd0 [ 54.519957] [] ? do_futex+0x17f0/0x17f0 [ 54.525555] [] ? SyS_dup2+0x3c5/0x5e0 [ 54.530995] [] SyS_connect+0x24/0x30 [ 54.536340] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 54.542890] 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 [ 54.569870] RIP [] l2tp_session_create+0x948/0x1030 [ 54.576633] RSP [ 54.580237] CR2: 0000000000000080 [ 54.583796] ---[ end trace c04d757aaebffd6b ]--- [ 54.590295] Kernel panic - not syncing: Fatal exception [ 54.596033] Dumping ftrace buffer: [ 54.599565] (ftrace buffer empty) [ 54.603253] Kernel Offset: disabled [ 54.606871] Rebooting in 86400 seconds..