[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.924521] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.821731] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.296435] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.854028] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 38.239802] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 44.031545] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) 2018/08/22 07:45:00 parsed 1 programs [ 45.977508] random: cc1: uninitialized urandom read (8 bytes read, 74 bits of entropy available) 2018/08/22 07:45:02 executed programs: 0 [ 47.282932] IPVS: Creating netns size=2552 id=1 [ 47.525045] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 47.540507] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 47.620206] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 47.635573] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 47.719396] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 47.734970] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 47.751889] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 47.769362] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 48.483768] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 48.519799] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 2018/08/22 07:45:07 executed programs: 229 2018/08/22 07:45:12 executed programs: 563 2018/08/22 07:45:17 executed programs: 899 2018/08/22 07:45:22 executed programs: 1226 2018/08/22 07:45:27 executed programs: 1565 2018/08/22 07:45:32 executed programs: 1900 [ 79.201598] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 2018/08/22 07:45:37 executed programs: 2221 2018/08/22 07:45:42 executed programs: 2556 2018/08/22 07:45:47 executed programs: 2893 [ 97.018619] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 97.026859] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 97.033539] PGD b5fc4067 PUD b917a067 PMD 0 [ 97.038285] Oops: 0002 [#1] PREEMPT SMP KASAN [ 97.043242] Dumping ftrace buffer: [ 97.046753] (ftrace buffer empty) [ 97.050438] Modules linked in: [ 97.053728] CPU: 0 PID: 16480 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 97.061403] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.070729] task: ffff8800b7498000 task.stack: ffff8800af8e0000 [ 97.076758] RIP: 0010:[<ffffffff835aa438>] [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 97.085862] RSP: 0018:ffff8800af8e7ad0 EFLAGS: 00010246 [ 97.091291] RAX: 0000000000000000 RBX: ffff8800b2b7e780 RCX: 0000000000000006 [ 97.098538] RDX: 1ffff1001656fd20 RSI: ffffffff835a4543 RDI: ffff8800b2b7e900 [ 97.105793] RBP: ffff8800af8e7b40 R08: ffff8800b7498900 R09: 0000000000000000 [ 97.113077] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d1de1728 [ 97.120322] R13: ffff8800af8e7c58 R14: ffff8801d1de1680 R15: ffffffff835a3170 [ 97.127566] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f771db40 [ 97.135763] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 97.141619] CR2: 0000000000000080 CR3: 00000000ba93c000 CR4: 00000000001606f0 [ 97.148864] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 97.156106] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 97.163351] Stack: [ 97.165472] ffffffff81140a6a ffff8800b2b7e7a0 ffff8801d1de17d8 ffff8801d1de1690 [ 97.173463] ffffffff838cba90 ffff8801d1de1730 ffff8801d1de17d0 ffff8800b2b7e860 [ 97.181449] ffffffff00000000 ffff8801cf196600 0000000000000000 ffff8801cf196630 [ 97.189446] Call Trace: [ 97.192009] [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0 [ 97.198302] [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40 [ 97.204505] [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910 [ 97.210620] [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320 [ 97.216486] [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0 [ 97.223039] [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300 [ 97.228634] [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280 [ 97.234145] [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0 [ 97.240351] [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310 [ 97.247334] [<ffffffff82f297c1>] ? SyS_socket+0x121/0x1b0 [ 97.252933] [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50 [ 97.259142] [<ffffffff82f2a094>] SyS_connect+0x24/0x30 [ 97.264485] [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30 [ 97.269914] [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 [ 97.276041] [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a [ 97.282066] 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 [ 97.308927] RIP [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 97.315686] RSP <ffff8800af8e7ad0> [ 97.319287] CR2: 0000000000000080 [ 97.322872] ---[ end trace e9d7be6b6c172b5e ]--- [ 97.327618] Kernel panic - not syncing: Fatal exception [ 97.333374] Dumping ftrace buffer: [ 97.336895] (ftrace buffer empty) [ 97.340580] Kernel Offset: disabled [ 97.344179] Rebooting in 86400 seconds..