[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.412872] 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: [ 28.137421] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 28.674679] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 29.353064] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 35.563240] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 41.200939] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) 2018/08/22 15:43:28 parsed 1 programs [ 42.706048] random: cc1: uninitialized urandom read (8 bytes read, 73 bits of entropy available) 2018/08/22 15:43:31 executed programs: 0 [ 44.084011] IPVS: Creating netns size=2552 id=1 [ 44.324146] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 44.339588] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 44.420494] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 44.436416] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 44.517343] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 44.532535] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 44.549256] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 44.566174] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 45.289647] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 45.329213] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 46.085340] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 46.093565] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 46.100249] PGD 1da383067 PUD 1da230067 PMD 0 [ 46.105173] Oops: 0002 [#1] PREEMPT SMP KASAN [ 46.110175] Dumping ftrace buffer: [ 46.113687] (ftrace buffer empty) [ 46.117369] Modules linked in: [ 46.120791] CPU: 1 PID: 4267 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 46.128409] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.137739] task: ffff8801d6eb3000 task.stack: ffff8801d6d80000 [ 46.143773] RIP: 0010:[<ffffffff835aa438>] [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 46.152969] RSP: 0018:ffff8801d6d87ad0 EFLAGS: 00010246 [ 46.158395] RAX: 0000000000000000 RBX: ffff8800b94eb680 RCX: 0000000000000006 [ 46.165787] RDX: 1ffff1001729d700 RSI: ffffffff835a4543 RDI: ffff8800b94eb800 [ 46.173136] RBP: ffff8801d6d87b40 R08: ffff8801d6eb3900 R09: 0000000000000000 [ 46.180382] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b9817228 [ 46.187631] R13: ffff8801d6d87c58 R14: ffff8800b9817180 R15: ffffffff835a3170 [ 46.194879] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7738b40 [ 46.203083] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 46.209031] CR2: 0000000000000080 CR3: 00000001da252000 CR4: 00000000001606f0 [ 46.216281] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.223526] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.230768] Stack: [ 46.232895] ffffffff81140a6a ffff8800b94eb6a0 ffff8800b98172d8 ffff8800b9817190 [ 46.240911] ffffffff838cba90 ffff8800b9817230 ffff8800b98172d0 ffff8800b94eb760 [ 46.248907] ffffffff00000000 ffff8800b055aa80 0000000000000000 ffff8800b055aab0 [ 46.256945] Call Trace: [ 46.259512] [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0 [ 46.265815] [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40 [ 46.272032] [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910 [ 46.278232] [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320 [ 46.284196] [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0 [ 46.290879] [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300 [ 46.296481] [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280 [ 46.301994] [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0 [ 46.308210] [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310 [ 46.315203] [<ffffffff82f297c1>] ? SyS_socket+0x121/0x1b0 [ 46.320852] [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50 [ 46.327066] [<ffffffff82f2a094>] SyS_connect+0x24/0x30 [ 46.332408] [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30 [ 46.337834] [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 [ 46.343952] [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a [ 46.349985] 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 [ 46.376889] RIP [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 46.383659] RSP <ffff8801d6d87ad0> [ 46.387262] CR2: 0000000000000080 [ 46.392367] ---[ end trace 57dc41024bdf3ce1 ]--- [ 46.397127] Kernel panic - not syncing: Fatal exception [ 46.402772] Dumping ftrace buffer: [ 46.406343] (ftrace buffer empty) [ 46.410034] Kernel Offset: disabled [ 46.413640] Rebooting in 86400 seconds..