[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.339619] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 19.580825] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 19.823512] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 20.483391] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 114.686194] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. [ 120.324413] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) 2018/08/23 03:45:59 parsed 1 programs [ 121.945225] random: cc1: uninitialized urandom read (8 bytes read, 98 bits of entropy available) 2018/08/23 03:46:02 executed programs: 0 [ 123.298147] IPVS: Creating netns size=2552 id=1 [ 123.540547] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 123.554611] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 123.636622] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 123.652098] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 123.733266] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 123.748213] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 123.764100] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 123.781017] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 124.536416] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 124.579153] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 124.913219] hrtimer: interrupt took 31410 ns [ 125.559167] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 125.567953] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 125.575011] PGD 1d24ac067 PUD 1d24ab067 PMD 0 [ 125.579962] Oops: 0002 [#1] PREEMPT SMP KASAN [ 125.585071] Dumping ftrace buffer: [ 125.588694] (ftrace buffer empty) [ 125.593653] Modules linked in: [ 125.596971] CPU: 1 PID: 4307 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #21 [ 125.610250] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 125.623962] task: ffff8800b8d96000 task.stack: ffff8801d2e50000 [ 125.630135] RIP: 0010:[<ffffffff835aa438>] [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 125.639526] RSP: 0018:ffff8801d2e57ad0 EFLAGS: 00010246 [ 125.644962] RAX: 0000000000000000 RBX: ffff8800b0f04f00 RCX: 0000000000000006 [ 125.652485] RDX: 1ffff100161e0a10 RSI: ffffffff835a4543 RDI: ffff8800b0f05080 [ 125.659752] RBP: ffff8801d2e57b40 R08: ffff8800b8d96900 R09: 0000000000000000 [ 125.667017] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b0f04328 [ 125.674284] R13: ffff8801d2e57c58 R14: ffff8800b0f04280 R15: ffffffff835a3170 [ 125.681549] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7749b40 [ 125.689920] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 125.695793] CR2: 0000000000000080 CR3: 00000001d24a7000 CR4: 00000000001606f0 [ 125.703064] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 125.710484] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 125.717890] Stack: [ 125.720031] ffffffff81140a6a ffff8800b0f04f20 ffff8800b0f043d8 ffff8800b0f04290 [ 125.728212] ffffffff838cba90 ffff8800b0f04330 ffff8800b0f043d0 ffff8800b0f04fe0 [ 125.736254] ffffffff00000000 ffff8800b928ee80 0000000000000000 ffff8800b928eeb0 [ 125.744288] Call Trace: [ 125.746871] [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0 [ 125.753210] [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40 [ 125.759445] [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910 [ 125.765759] [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320 [ 125.771803] [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0 [ 125.778502] [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300 [ 125.784121] [<ffffffff813fcff1>] ? SYSC_perf_event_open+0x211/0x2470 [ 125.790691] [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280 [ 125.796342] [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0 [ 125.802715] [<ffffffff838ccd29>] ? retint_kernel+0x2d/0x2d [ 125.808422] [<ffffffff838ccd29>] ? retint_kernel+0x2d/0x2d [ 125.814124] [<ffffffff82f2a094>] SyS_connect+0x24/0x30 [ 125.819477] [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30 [ 125.824918] [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 [ 125.831051] [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a [ 125.837095] 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 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 125.864969] RIP [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 125.871767] RSP <ffff8801d2e57ad0> [ 125.875554] CR2: 0000000000000080 [ 125.881682] ---[ end trace 822e687da5ff49aa ]--- [ 125.886504] Kernel panic - not syncing: Fatal exception [ 125.892503] Dumping ftrace buffer: [ 125.896037] (ftrace buffer empty) [ 125.899730] Kernel Offset: disabled [ 125.907305] Rebooting in 86400 seconds..