[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.325800] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.639582] random: sshd: uninitialized urandom read (32 bytes read) [ 28.110731] random: sshd: uninitialized urandom read (32 bytes read) [ 28.630993] random: sshd: uninitialized urandom read (32 bytes read) [ 105.998534] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 111.616582] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 00:27:14 parsed 1 programs [ 112.749956] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 00:27:16 executed programs: 0 [ 113.914695] IPVS: Creating netns size=2536 id=1 [ 114.039779] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 114.051345] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 114.094662] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 114.105604] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 114.149545] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 114.161029] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 114.172513] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 114.194496] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 114.703743] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 114.728514] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 114.734812] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 114.742492] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 114.968333] hrtimer: interrupt took 12908 ns [ 115.039653] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 115.047876] IP: [] l2tp_session_create+0xc60/0x16f0 [ 115.054572] PGD 1d3c36067 [ 115.057214] PUD 1d44f3067 PMD 0 [ 115.060695] [ 115.062319] Oops: 0002 [#1] PREEMPT SMP KASAN [ 115.066795] Dumping ftrace buffer: [ 115.070312] (ftrace buffer empty) [ 115.074002] Modules linked in: [ 115.077287] CPU: 0 PID: 4299 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 [ 115.084877] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 115.094206] task: ffff8801d4bf4800 task.stack: ffff8801d40c0000 [ 115.100232] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 115.109351] RSP: 0018:ffff8801d40c7ac0 EFLAGS: 00010246 [ 115.114776] RAX: 0000000000000000 RBX: ffff8801d4321b80 RCX: 1ffff1003a97ea1d [ 115.122023] RDX: 1ffff1003a864350 RSI: ffff8801d4bf50c8 RDI: ffff8801d4321a80 [ 115.129266] RBP: ffff8801d40c7b60 R08: ffff8801d4bf50e8 R09: 0000000000000000 [ 115.136507] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4321958 [ 115.143753] R13: 0000000000000000 R14: ffff8801d4321900 R15: ffff8801d40c7c78 [ 115.151004] FS: 00007f0ee875d700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 115.159205] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 115.165060] CR2: 0000000000000080 CR3: 00000001d45cc000 CR4: 00000000001606f0 [ 115.172306] Stack: [ 115.174434] 0000000000000201 ffffffff836ca141 ffff8801d40c7ae0 ffffffff81237f0d [ 115.182475] ffff8801d4321900 ffff8801d4321cd8 ffff8801d4321958 ffff8801d4321cd0 [ 115.190474] ffff8801d4321c30 ffff8801d4321920 0000000000000000 0000000000000000 [ 115.198538] Call Trace: [ 115.201109] [] ? l2tp_session_get+0x1d1/0x790 [ 115.207361] [] ? trace_hardirqs_on+0xd/0x10 [ 115.213336] [] pppol2tp_connect+0x10d7/0x18f0 [ 115.219483] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 115.225768] [] ? security_socket_connect+0x8f/0xc0 [ 115.232350] [] SYSC_connect+0x1b8/0x300 [ 115.237959] [] ? SYSC_bind+0x280/0x280 [ 115.243579] [] ? do_futex+0x17c0/0x17c0 [ 115.249189] [] ? move_addr_to_kernel+0x50/0x50 [ 115.255401] [] SyS_connect+0x24/0x30 [ 115.260747] [] ? SyS_accept+0x30/0x30 [ 115.266179] [] do_syscall_64+0x1a6/0x490 [ 115.271922] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 115.278873] 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 [ 115.305810] RIP [] l2tp_session_create+0xc60/0x16f0 [ 115.312582] RSP [ 115.316185] CR2: 0000000000000080 [ 115.320782] ---[ end trace ce4bcda629098e7d ]--- [ 115.325608] Kernel panic - not syncing: Fatal exception [ 115.331224] Dumping ftrace buffer: [ 115.334747] (ftrace buffer empty) [ 115.338437] Kernel Offset: disabled [ 115.342041] Rebooting in 86400 seconds..