[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.313004] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.628120] random: sshd: uninitialized urandom read (32 bytes read) [ 19.978575] random: sshd: uninitialized urandom read (32 bytes read) [ 20.444360] random: sshd: uninitialized urandom read (32 bytes read) [ 60.367583] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 65.840994] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 02:01:50 parsed 1 programs [ 66.864569] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 02:01:52 executed programs: 0 [ 67.995537] IPVS: Creating netns size=2536 id=1 [ 68.126910] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 68.138612] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 68.182821] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 68.194162] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 68.238455] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 68.249728] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 68.261709] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 68.274823] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 68.784798] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 68.810634] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 68.816855] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 68.824266] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 69.015943] hrtimer: interrupt took 12156 ns [ 69.125649] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 69.150733] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 69.238139] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 69.246510] IP: [] l2tp_session_create+0xc60/0x16f0 [ 69.253193] PGD 1d3e1f067 [ 69.255833] PUD 1d3e64067 PMD 0 [ 69.259307] [ 69.260931] Oops: 0002 [#1] PREEMPT SMP KASAN [ 69.265401] Dumping ftrace buffer: [ 69.268913] (ftrace buffer empty) [ 69.272598] Modules linked in: [ 69.275878] CPU: 0 PID: 4322 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 [ 69.283466] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.292792] task: ffff8801d3e3c800 task.stack: ffff8801d4750000 [ 69.298820] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 69.307932] RSP: 0018:ffff8801d4757ac0 EFLAGS: 00010246 [ 69.313353] RAX: 0000000000000000 RBX: ffff8801d3f66780 RCX: 1ffff1003a7c7a1d [ 69.320596] RDX: 1ffff1003a7ecdc0 RSI: ffff8801d3e3d0c8 RDI: ffff8801d3f66e00 [ 69.327838] RBP: ffff8801d4757b60 R08: ffff8801d3e3d0e8 R09: 0000000000000000 [ 69.335133] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3f66cd8 [ 69.342431] R13: 0000000000000000 R14: ffff8801d3f66c80 R15: ffff8801d4757c78 [ 69.349682] FS: 00007f28a5885700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 69.357881] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.363748] CR2: 0000000000000080 CR3: 00000001d3e03000 CR4: 00000000001606f0 [ 69.370991] Stack: [ 69.373113] 0000000000000201 ffffffff836ca141 ffff8801d4757ae0 ffffffff81237f0d [ 69.381113] ffff8801d3f66c80 ffff8801d3f668d8 ffff8801d3f66cd8 ffff8801d3f668d0 [ 69.389130] ffff8801d3f66830 ffff8801d3f66ca0 0000000000000000 0000000000000000 [ 69.397107] Call Trace: [ 69.399672] [] ? l2tp_session_get+0x1d1/0x790 [ 69.405795] [] ? trace_hardirqs_on+0xd/0x10 [ 69.411741] [] pppol2tp_connect+0x10d7/0x18f0 [ 69.417856] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 69.424065] [] ? lock_acquire+0x173/0x3e0 [ 69.429851] [] ? security_socket_connect+0x8f/0xc0 [ 69.436403] [] SYSC_connect+0x1b8/0x300 [ 69.441998] [] ? SYSC_bind+0x280/0x280 [ 69.447511] [] ? do_futex+0x17c0/0x17c0 [ 69.453109] [] SyS_connect+0x24/0x30 [ 69.458469] [] ? SyS_accept+0x30/0x30 [ 69.463970] [] do_syscall_64+0x1a6/0x490 [ 69.469662] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 69.476560] 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 [ 69.503336] RIP [] l2tp_session_create+0xc60/0x16f0 [ 69.510101] RSP [ 69.513697] CR2: 0000000000000080 [ 69.519969] ---[ end trace 89cd381a9a111a34 ]--- [ 69.524807] Kernel panic - not syncing: Fatal exception [ 69.530420] Dumping ftrace buffer: [ 69.533931] (ftrace buffer empty) [ 69.537612] Kernel Offset: disabled [ 69.541208] Rebooting in 86400 seconds..