[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.630239] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.252392] random: sshd: uninitialized urandom read (32 bytes read) [ 16.581521] random: sshd: uninitialized urandom read (32 bytes read) [ 17.119175] random: sshd: uninitialized urandom read (32 bytes read) [ 17.269237] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 22.901606] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 18:01:02 parsed 1 programs [ 23.910526] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 18:01:03 executed programs: 0 [ 25.039696] IPVS: Creating netns size=2536 id=1 [ 25.166755] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 25.178348] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 25.221940] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 25.233236] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 25.276966] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 25.288579] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 25.300363] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 25.320469] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 25.826121] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 25.851042] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 25.857635] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 25.864466] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.075388] hrtimer: interrupt took 16353 ns [ 26.367488] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 26.382024] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 26.797109] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 26.805445] IP: [] l2tp_session_create+0xc60/0x16f0 [ 26.812132] PGD 1cdee5067 [ 26.814772] PUD 1cfdd1067 PMD 0 [ 26.818308] [ 26.819925] Oops: 0002 [#1] PREEMPT SMP KASAN [ 26.824392] Dumping ftrace buffer: [ 26.827904] (ftrace buffer empty) [ 26.831697] Modules linked in: [ 26.835100] CPU: 0 PID: 4654 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 [ 26.842696] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.852177] task: ffff8801cee76000 task.stack: ffff8801cdfb8000 [ 26.858217] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 26.867485] RSP: 0018:ffff8801cdfbfac0 EFLAGS: 00010246 [ 26.872912] RAX: 0000000000000000 RBX: ffff8801cee44780 RCX: 1ffff10039dced1d [ 26.880156] RDX: 1ffff10039dc8b00 RSI: ffff8801cee768c8 RDI: ffff8801cee45800 [ 26.887413] RBP: ffff8801cdfbfb60 R08: ffff8801cee768e8 R09: 0000000000000000 [ 26.894661] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cee456d8 [ 26.901907] R13: 0000000000000000 R14: ffff8801cee45680 R15: ffff8801cdfbfc78 [ 26.909158] FS: 00007f41ec814700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.917478] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.923445] CR2: 0000000000000080 CR3: 00000001ceec3000 CR4: 00000000001606f0 [ 26.930790] Stack: [ 26.932915] 0000000000000201 ffffffff836ca141 ffff8801cdfbfae0 ffffffff81237f0d [ 26.940923] ffff8801cee45680 ffff8801cee448d8 ffff8801cee456d8 ffff8801cee448d0 [ 26.949121] ffff8801cee44830 ffff8801cee456a0 0000000000000000 0000000000000000 [ 26.957106] Call Trace: [ 26.959675] [] ? l2tp_session_get+0x1d1/0x790 [ 26.965798] [] ? trace_hardirqs_on+0xd/0x10 [ 26.971747] [] pppol2tp_connect+0x10d7/0x18f0 [ 26.977888] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 26.984111] [] ? check_preemption_disabled+0x3b/0x170 [ 26.990925] [] ? retint_kernel+0x2d/0x2d [ 26.996613] [] ? move_addr_to_kernel.part.13+0x35/0x110 [ 27.003604] [] ? security_socket_connect+0x8f/0xc0 [ 27.010164] [] SYSC_connect+0x1b8/0x300 [ 27.015766] [] ? SYSC_bind+0x280/0x280 [ 27.021325] [] ? do_futex+0x17c0/0x17c0 [ 27.026931] [] SyS_connect+0x24/0x30 [ 27.032278] [] ? SyS_accept+0x30/0x30 [ 27.037701] [] do_syscall_64+0x1a6/0x490 [ 27.043622] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.050524] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 27.077960] RIP [] l2tp_session_create+0xc60/0x16f0 [ 27.084900] RSP [ 27.088498] CR2: 0000000000000080 [ 27.094364] ---[ end trace 07078be26f6e918d ]--- [ 27.099256] Kernel panic - not syncing: Fatal exception [ 27.104870] Dumping ftrace buffer: [ 27.108384] (ftrace buffer empty) [ 27.112069] Kernel Offset: disabled [ 27.115670] Rebooting in 86400 seconds..