[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.393535] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.992753] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.485375] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 29.179047] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 44.277200] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. [ 49.787592] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) 2018/08/23 03:09:50 parsed 1 programs [ 51.319490] random: cc1: uninitialized urandom read (8 bytes read, 89 bits of entropy available) 2018/08/23 03:09:52 executed programs: 0 [ 52.484908] IPVS: Creating netns size=2552 id=1 [ 52.733351] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 52.749157] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 52.832819] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 52.848243] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 52.932296] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 52.947826] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 52.965243] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 52.982935] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 53.729311] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 53.769516] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 56.594886] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 56.603165] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 56.609850] PGD b631b067 PUD b686a067 PMD 0 [ 56.614602] Oops: 0002 [#1] PREEMPT SMP KASAN [ 56.619571] Dumping ftrace buffer: [ 56.623082] (ftrace buffer empty) [ 56.626767] Modules linked in: [ 56.630067] CPU: 0 PID: 4879 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #21 [ 56.637659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.647001] task: ffff8801cf4b4800 task.stack: ffff8800ad920000 [ 56.653031] RIP: 0010:[<ffffffff835aa438>] [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 56.662144] RSP: 0018:ffff8800ad927ad0 EFLAGS: 00010246 [ 56.667580] RAX: 0000000000000000 RBX: ffff8801d29ffb80 RCX: 0000000000000006 [ 56.674832] RDX: 1ffff1003a53ffa0 RSI: ffffffff835a4543 RDI: ffff8801d29ffd00 [ 56.682078] RBP: ffff8800ad927b40 R08: ffff8801cf4b5100 R09: 0000000000000000 [ 56.689327] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801ce297c28 [ 56.696572] R13: ffff8800ad927c58 R14: ffff8801ce297b80 R15: ffffffff835a3170 [ 56.703822] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f778cb40 [ 56.712025] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 56.717884] CR2: 0000000000000080 CR3: 00000000b412b000 CR4: 00000000001606f0 [ 56.725134] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.732384] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.739644] Stack: [ 56.741786] ffffffff81140a6a ffff8801d29ffba0 ffff8801ce297cd8 ffff8801ce297b90 [ 56.749783] ffffffff838cba90 ffff8801ce297c30 ffff8801ce297cd0 ffff8801d29ffc60 [ 56.757781] ffffffff00000000 ffff8801cc3a3b80 0000000000000000 ffff8801cc3a3bb0 [ 56.765794] Call Trace: [ 56.768362] [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0 [ 56.774660] [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40 [ 56.780870] [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910 [ 56.786994] [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320 [ 56.792862] [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0 [ 56.799430] [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300 [ 56.805031] [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280 [ 56.810544] [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0 [ 56.816754] [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310 [ 56.823744] [<ffffffff82f297c1>] ? SyS_socket+0x121/0x1b0 [ 56.829345] [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50 [ 56.835553] [<ffffffff82f2a094>] SyS_connect+0x24/0x30 [ 56.840895] [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30 [ 56.846326] [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 [ 56.852450] [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a [ 56.858477] 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 [ 56.885496] RIP [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 56.892267] RSP <ffff8800ad927ad0> [ 56.895867] CR2: 0000000000000080 [ 56.900905] ---[ end trace 0cefa775742a769f ]--- [ 56.905677] Kernel panic - not syncing: Fatal exception [ 56.911472] Dumping ftrace buffer: [ 56.914994] (ftrace buffer empty) [ 56.918677] Kernel Offset: disabled [ 56.922281] Rebooting in 86400 seconds..