[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.232981] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.294345] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.683791] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.469910] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) [ 31.420997] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 36.935363] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) 2018/08/23 03:44:41 parsed 1 programs [ 38.179389] random: cc1: uninitialized urandom read (8 bytes read, 89 bits of entropy available) 2018/08/23 03:44:43 executed programs: 0 [ 39.433686] IPVS: Creating netns size=2552 id=1 [ 39.676449] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 39.691913] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 39.773132] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 39.788042] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 39.868820] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 39.883563] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 39.898652] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 39.916370] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 40.651309] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 40.688756] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 41.013536] hrtimer: interrupt took 18500 ns [ 41.306246] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 41.314577] IP: [] l2tp_session_create+0x948/0x1030 [ 41.321253] PGD b8ca7067 PUD b8e34067 PMD 0 [ 41.325991] Oops: 0002 [#1] PREEMPT SMP KASAN [ 41.330969] Dumping ftrace buffer: [ 41.334479] (ftrace buffer empty) [ 41.338162] Modules linked in: [ 41.341449] CPU: 1 PID: 4321 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #85 [ 41.349162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.358491] task: ffff8800b9ac4800 task.stack: ffff8800b8cc0000 [ 41.364642] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 41.373748] RSP: 0018:ffff8800b8cc7b48 EFLAGS: 00010246 [ 41.379269] RAX: 0000000000000000 RBX: ffff8800b9254000 RCX: 0000000000000006 [ 41.386518] RDX: 1ffff1001724a830 RSI: ffffffff835a4543 RDI: ffff8800b9254180 [ 41.394994] RBP: ffff8800b8cc7bb8 R08: ffff8800b9ac5100 R09: 0000000000000000 [ 41.402254] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d827eaa8 [ 41.409510] R13: ffff8800b8cc7cd0 R14: ffff8801d827ea00 R15: ffffffff835a3170 [ 41.416763] FS: 00007f03a009e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 41.425176] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.431048] CR2: 0000000000000080 CR3: 00000000b9222000 CR4: 00000000001606f0 [ 41.438303] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.445556] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.452808] Stack: [ 41.454939] ffffffff81140a6a ffff8800b9254020 ffff8801d827eb58 ffff8801d827ea10 [ 41.462968] ffffffff838cba90 ffff8801d827eab0 ffff8801d827eb50 ffff8800b92540e0 [ 41.470982] ffffffff00000000 ffff8800b91f5500 0000000000000000 ffff8800b91f5530 [ 41.479004] Call Trace: [ 41.481595] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 41.487904] [] ? _raw_read_unlock_bh+0x30/0x40 [ 41.494123] [] pppol2tp_connect+0x10f0/0x1910 [ 41.500250] [] ? pppol2tp_recv+0x320/0x320 [ 41.506138] [] ? security_socket_connect+0x8f/0xc0 [ 41.512706] [] SYSC_connect+0x1b8/0x300 [ 41.518318] [] ? SYSC_perf_event_open+0x211/0x2470 [ 41.524892] [] ? SYSC_bind+0x280/0x280 [ 41.530412] [] ? get_unused_fd_flags+0xd0/0xd0 [ 41.536633] [] ? do_futex+0x17f0/0x17f0 [ 41.542241] [] ? move_addr_to_kernel+0x50/0x50 [ 41.548578] [] ? SYSC_perf_event_open+0x253/0x2470 [ 41.555144] [] SyS_connect+0x24/0x30 [ 41.560497] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 41.567054] 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 [ 41.594301] RIP [] l2tp_session_create+0x948/0x1030 [ 41.601086] RSP [ 41.604693] CR2: 0000000000000080 [ 41.620140] ---[ end trace 3f22188453d1cdc5 ]--- [ 41.628593] Kernel panic - not syncing: Fatal exception [ 41.634348] Dumping ftrace buffer: [ 41.634352] (ftrace buffer empty) [ 41.634355] Kernel Offset: disabled [ 41.645216] Rebooting in 86400 seconds..