[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.491401] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.011112] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.287095] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.935387] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 41.830343] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 47.551762] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) 2018/08/22 16:22:59 parsed 1 programs [ 49.192060] random: cc1: uninitialized urandom read (8 bytes read, 82 bits of entropy available) 2018/08/22 16:23:01 executed programs: 0 [ 50.386860] IPVS: Creating netns size=2552 id=1 [ 50.617911] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 50.632541] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 50.709172] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 50.724402] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 50.825077] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 50.844803] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 50.859796] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 50.876577] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 51.562418] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 51.599786] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 51.890117] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 51.912543] hrtimer: interrupt took 20473 ns [ 52.133316] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 52.141524] IP: [] l2tp_session_create+0x948/0x1030 [ 52.148204] PGD bb1a9067 PUD ba58d067 PMD 0 [ 52.152967] Oops: 0002 [#1] PREEMPT SMP KASAN [ 52.157912] Dumping ftrace buffer: [ 52.161424] (ftrace buffer empty) [ 52.165112] Modules linked in: [ 52.168396] CPU: 1 PID: 4132 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 52.175984] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.185315] task: ffff8800bb274800 task.stack: ffff8800ba9e8000 [ 52.191344] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 52.200450] RSP: 0018:ffff8800ba9efad0 EFLAGS: 00010246 [ 52.205876] RAX: 0000000000000000 RBX: ffff8800bb2b1900 RCX: 0000000000000006 [ 52.213119] RDX: 1ffff10017656350 RSI: ffffffff835a4543 RDI: ffff8800bb2b1a80 [ 52.220361] RBP: ffff8800ba9efb40 R08: ffff8800bb275100 R09: 0000000000000000 [ 52.227602] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d8244d28 [ 52.234845] R13: ffff8800ba9efc58 R14: ffff8801d8244c80 R15: ffffffff835a3170 [ 52.242090] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77b1b40 [ 52.250293] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 52.256154] CR2: 0000000000000080 CR3: 00000000ba9d5000 CR4: 00000000001606f0 [ 52.263407] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.270651] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.277892] Stack: [ 52.280021] ffffffff81140a6a ffff8800bb2b1920 ffff8801d8244dd8 ffff8801d8244c90 [ 52.288014] ffffffff838cba90 ffff8801d8244d30 ffff8801d8244dd0 ffff8800bb2b19e0 [ 52.296006] ffffffff00000000 ffff8800ba56c400 0000000000000000 ffff8800ba56c430 [ 52.303985] Call Trace: [ 52.306545] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 52.312839] [] ? _raw_read_unlock_bh+0x30/0x40 [ 52.319045] [] pppol2tp_connect+0x10f0/0x1910 [ 52.325177] [] ? pppol2tp_recv+0x320/0x320 [ 52.331050] [] ? security_socket_connect+0x8f/0xc0 [ 52.337633] [] SYSC_connect+0x1b8/0x300 [ 52.343226] [] ? SYSC_bind+0x280/0x280 [ 52.348747] [] ? get_unused_fd_flags+0xd0/0xd0 [ 52.354958] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 52.361947] [] ? SyS_socket+0x121/0x1b0 [ 52.367543] [] ? move_addr_to_kernel+0x50/0x50 [ 52.373745] [] SyS_connect+0x24/0x30 [ 52.379081] [] ? SyS_accept+0x30/0x30 [ 52.384523] [] do_fast_syscall_32+0x324/0x8b0 [ 52.390682] [] sysenter_flags_fixed+0xd/0x1a [ 52.396713] 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 [ 52.423544] RIP [] l2tp_session_create+0x948/0x1030 [ 52.430316] RSP [ 52.433909] CR2: 0000000000000080 [ 52.440267] ---[ end trace 082f03667a10b98d ]--- [ 52.445017] Kernel panic - not syncing: Fatal exception [ 52.450776] Dumping ftrace buffer: [ 52.454295] (ftrace buffer empty) [ 52.457976] Kernel Offset: disabled [ 52.461593] Rebooting in 86400 seconds..