[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.753868] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.895888] random: sshd: uninitialized urandom read (32 bytes read) [ 22.175289] random: sshd: uninitialized urandom read (32 bytes read) [ 22.606233] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 28.444000] urandom_read: 1 callbacks suppressed [ 28.444004] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 03:45:11 parsed 1 programs [ 29.177163] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 03:45:12 executed programs: 0 [ 29.676644] IPVS: Creating netns size=2536 id=1 [ 29.802915] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 29.815227] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 29.860050] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 29.871685] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 29.915646] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 29.927610] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 29.939617] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 29.960685] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.474769] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.500614] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 30.506852] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 30.513571] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.718213] hrtimer: interrupt took 13248 ns [ 30.843453] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 30.851689] IP: [] l2tp_session_create+0xc60/0x16f0 [ 30.858371] PGD 1d5625067 [ 30.861015] PUD 1d7b27067 PMD 0 [ 30.864702] [ 30.866323] Oops: 0002 [#1] PREEMPT SMP KASAN [ 30.870791] Dumping ftrace buffer: [ 30.874302] (ftrace buffer empty) [ 30.877988] Modules linked in: [ 30.881387] CPU: 1 PID: 4241 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 [ 30.889081] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.898417] task: ffff8801d5ed0000 task.stack: ffff8801d4fb8000 [ 30.904484] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 30.913836] RSP: 0018:ffff8801d4fbfac0 EFLAGS: 00010246 [ 30.919262] RAX: 0000000000000000 RBX: ffff8801b6caa000 RCX: 1ffff1003abda11d [ 30.926515] RDX: 1ffff1003b452f50 RSI: ffff8801d5ed08c8 RDI: ffff8801da297a80 [ 30.933826] RBP: ffff8801d4fbfb60 R08: ffff8801d5ed08e8 R09: 0000000000000000 [ 30.941086] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da297958 [ 30.948338] R13: 0000000000000000 R14: ffff8801da297900 R15: ffff8801d4fbfc78 [ 30.955592] FS: 00007ffae2002700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.963832] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.969709] CR2: 0000000000000080 CR3: 00000001da34e000 CR4: 00000000001606f0 [ 30.977084] Stack: [ 30.979346] 0000000000000201 ffffffff836ca141 ffff8801d4fbfae0 ffffffff81237f0d [ 30.987361] ffff8801da297900 ffff8801b6caa158 ffff8801da297958 ffff8801b6caa150 [ 30.995364] ffff8801b6caa0b0 ffff8801da297920 0000000000000000 0000000000000000 [ 31.003365] Call Trace: [ 31.006005] [] ? l2tp_session_get+0x1d1/0x790 [ 31.012167] [] ? trace_hardirqs_on+0xd/0x10 [ 31.018134] [] pppol2tp_connect+0x10d7/0x18f0 [ 31.024314] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 31.030573] [] ? lock_acquire+0x173/0x3e0 [ 31.036441] [] ? security_socket_connect+0x8f/0xc0 [ 31.043029] [] SYSC_connect+0x1b8/0x300 [ 31.048767] [] ? SYSC_bind+0x280/0x280 [ 31.054298] [] ? do_futex+0x17c0/0x17c0 [ 31.059933] [] ? move_addr_to_kernel+0x50/0x50 [ 31.066305] [] SyS_connect+0x24/0x30 [ 31.071662] [] ? SyS_accept+0x30/0x30 [ 31.077103] [] do_syscall_64+0x1a6/0x490 [ 31.082938] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.089851] 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 [ 31.117002] RIP [] l2tp_session_create+0xc60/0x16f0 [ 31.123870] RSP [ 31.127484] CR2: 0000000000000080 [ 31.131740] ---[ end trace cdd82229a9a4ff9d ]--- [ 31.136638] Kernel panic - not syncing: Fatal exception [ 31.142331] Dumping ftrace buffer: [ 31.145848] (ftrace buffer empty) [ 31.149536] Kernel Offset: disabled [ 31.153149] Rebooting in 86400 seconds..