[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.896604] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.137041] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 19.285676] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 20.002765] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 87.958500] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 93.462529] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) 2018/08/22 22:44:04 parsed 1 programs [ 94.525443] random: cc1: uninitialized urandom read (8 bytes read, 94 bits of entropy available) 2018/08/22 22:44:06 executed programs: 0 [ 95.612794] IPVS: Creating netns size=2552 id=1 [ 95.851635] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 95.865572] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 95.946829] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 95.962372] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 96.041775] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 96.057708] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 96.072796] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 96.089257] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 96.807209] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 96.845530] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 98.497703] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 98.505943] IP: [] l2tp_session_create+0x948/0x1030 [ 98.512626] PGD 1d647f067 PUD 1d4808067 PMD 0 [ 98.517558] Oops: 0002 [#1] PREEMPT SMP KASAN [ 98.522522] Dumping ftrace buffer: [ 98.526045] (ftrace buffer empty) [ 98.529764] Modules linked in: [ 98.533058] CPU: 0 PID: 4524 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 98.540651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.549981] task: ffff8801d4b36000 task.stack: ffff8800b8c50000 [ 98.556011] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 98.565132] RSP: 0018:ffff8800b8c57b48 EFLAGS: 00010246 [ 98.570572] RAX: 0000000000000000 RBX: ffff8801d4fec780 RCX: 0000000000000006 [ 98.577853] RDX: 1ffff1003a9fd920 RSI: ffffffff835a4543 RDI: ffff8801d4fec900 [ 98.585100] RBP: ffff8800b8c57bb8 R08: ffff8801d4b36900 R09: 0000000000000000 [ 98.592366] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d4407228 [ 98.599611] R13: ffff8800b8c57cd0 R14: ffff8801d4407180 R15: ffffffff835a3170 [ 98.606858] FS: 00007f188ccd0700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 98.615059] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 98.620915] CR2: 0000000000000080 CR3: 00000001d83d7000 CR4: 00000000001606f0 [ 98.628176] Stack: [ 98.630304] ffffffff81140a6a ffff8801d4fec7a0 ffff8801d44072d8 ffff8801d4407190 [ 98.638341] ffffffff838cba90 ffff8801d4407230 ffff8801d44072d0 ffff8801d4fec860 [ 98.646337] ffffffff00000000 ffff8801d4ba6e80 0000000000000000 ffff8801d4ba6eb0 [ 98.654349] Call Trace: [ 98.656917] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 98.663215] [] ? _raw_read_unlock_bh+0x30/0x40 [ 98.669449] [] pppol2tp_connect+0x10f0/0x1910 [ 98.675583] [] ? pppol2tp_recv+0x320/0x320 [ 98.681468] [] ? security_socket_connect+0x8f/0xc0 [ 98.688023] [] SYSC_connect+0x1b8/0x300 [ 98.693623] [] ? SYSC_bind+0x280/0x280 [ 98.699159] [] ? get_unused_fd_flags+0xd0/0xd0 [ 98.705369] [] ? do_futex+0x17f0/0x17f0 [ 98.710968] [] ? SyS_dup2+0x3c5/0x5e0 [ 98.716393] [] SyS_connect+0x24/0x30 [ 98.721749] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 98.728320] 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 [ 98.755348] RIP [] l2tp_session_create+0x948/0x1030 [ 98.762109] RSP [ 98.765707] CR2: 0000000000000080 [ 98.771105] ---[ end trace 9cce690317e3cce8 ]--- [ 98.775860] Kernel panic - not syncing: Fatal exception [ 98.781557] Dumping ftrace buffer: [ 98.785082] (ftrace buffer empty) [ 98.788765] Kernel Offset: disabled [ 98.792382] Rebooting in 86400 seconds..