[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.362675] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.546556] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.864938] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.520036] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 51.484251] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 57.160539] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) 2018/08/22 21:43:20 parsed 1 programs [ 58.692247] random: cc1: uninitialized urandom read (8 bytes read, 81 bits of entropy available) 2018/08/22 21:43:22 executed programs: 0 [ 59.814461] IPVS: Creating netns size=2552 id=1 [ 60.063443] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 60.079113] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 60.160598] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 60.175485] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 60.258568] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 60.274090] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 60.291208] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 60.307020] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 61.062570] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 61.103475] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 61.392880] hrtimer: interrupt took 20704 ns [ 61.791322] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 61.799684] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 61.806364] PGD b9985067 PUD ba310067 PMD 0 [ 61.811095] Oops: 0002 [#1] PREEMPT SMP KASAN [ 61.816038] Dumping ftrace buffer: [ 61.819689] (ftrace buffer empty) [ 61.823376] Modules linked in: [ 61.826772] CPU: 1 PID: 4224 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 61.834496] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.843828] task: ffff8800ba7de000 task.stack: ffff8800b15a8000 [ 61.849876] RIP: 0010:[<ffffffff835aa438>] [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 61.858994] RSP: 0018:ffff8800b15afad0 EFLAGS: 00010246 [ 61.864417] RAX: 0000000000000000 RBX: ffff8801da23ea00 RCX: 0000000000000006 [ 61.871659] RDX: 1ffff1003b447d70 RSI: ffffffff835a4543 RDI: ffff8801da23eb80 [ 61.879055] RBP: ffff8800b15afb40 R08: ffff8800ba7de900 R09: 0000000000000000 [ 61.886420] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d827a328 [ 61.893784] R13: ffff8800b15afc58 R14: ffff8801d827a280 R15: ffffffff835a3170 [ 61.901067] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77e4b40 [ 61.909269] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 61.915129] CR2: 0000000000000080 CR3: 00000000b9931000 CR4: 00000000001606f0 [ 61.922377] Stack: [ 61.924526] ffffffff81140a6a ffff8801da23ea20 ffff8801d827a3d8 ffff8801d827a290 [ 61.932599] ffffffff838cba90 ffff8801d827a330 ffff8801d827a3d0 ffff8801da23eae0 [ 61.940622] ffffffff00000000 ffff8800bb117700 0000000000000000 ffff8800bb117730 [ 61.948713] Call Trace: [ 61.951328] [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0 [ 61.957656] [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40 [ 61.963890] [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910 [ 61.970021] [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320 [ 61.975894] [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0 [ 61.982460] [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300 [ 61.988069] [<ffffffff813fcff1>] ? SYSC_perf_event_open+0x211/0x2470 [ 61.994631] [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280 [ 62.000154] [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310 [ 62.007158] [<ffffffff838ccd29>] ? retint_kernel+0x2d/0x2d [ 62.012953] [<ffffffff82f2a094>] SyS_connect+0x24/0x30 [ 62.018302] [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30 [ 62.023739] [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 [ 62.029895] [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a [ 62.035930] 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 [ 62.063367] RIP [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 62.070150] RSP <ffff8800b15afad0> [ 62.073756] CR2: 0000000000000080 [ 62.077735] ---[ end trace 3ed298adc562eb67 ]--- [ 62.082508] Kernel panic - not syncing: Fatal exception [ 62.088163] Dumping ftrace buffer: [ 62.091687] (ftrace buffer empty) [ 62.095375] Kernel Offset: disabled [ 62.098979] Rebooting in 86400 seconds..