[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.579454] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.938983] random: sshd: uninitialized urandom read (32 bytes read) [ 20.305116] random: sshd: uninitialized urandom read (32 bytes read) [ 20.833273] random: sshd: uninitialized urandom read (32 bytes read) [ 20.970297] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. [ 26.546806] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 19:32:17 parsed 1 programs [ 27.579245] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 19:32:18 executed programs: 0 [ 28.701059] IPVS: Creating netns size=2536 id=1 [ 28.819596] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 28.831161] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 28.873097] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 28.884623] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 28.927099] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 28.938548] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 28.950610] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 28.971529] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 29.457542] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 29.482435] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 29.488528] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 29.495519] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 29.703375] hrtimer: interrupt took 18330 ns [ 29.838209] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 29.846424] IP: [] l2tp_session_create+0xc60/0x16f0 [ 29.853102] PGD 1d88f6067 [ 29.855750] PUD 1d8b0e067 PMD 0 [ 29.859263] [ 29.860924] Oops: 0002 [#1] PREEMPT SMP KASAN [ 29.865399] Dumping ftrace buffer: [ 29.868909] (ftrace buffer empty) [ 29.872594] Modules linked in: [ 29.875881] CPU: 0 PID: 4267 Comm: syz-executor0 Not tainted 4.9.123-g7fa8c15 #80 [ 29.883468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.892795] task: ffff8801d5119800 task.stack: ffff8801d4420000 [ 29.898819] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 29.907924] RSP: 0018:ffff8801d4427ac0 EFLAGS: 00010246 [ 29.913342] RAX: 0000000000000000 RBX: ffff8801d8770a00 RCX: 1ffff1003aa2341d [ 29.920586] RDX: 1ffff1003b0ee030 RSI: ffff8801d511a0c8 RDI: ffff8801d8770180 [ 29.927832] RBP: ffff8801d4427b60 R08: ffff8801d511a0e8 R09: 0000000000000000 [ 29.935073] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d8770058 [ 29.942316] R13: 0000000000000000 R14: ffff8801d8770000 R15: ffff8801d4427c78 [ 29.949559] FS: 00007f409d99f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.957761] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.963614] CR2: 0000000000000080 CR3: 00000001d7d8a000 CR4: 00000000001606f0 [ 29.970901] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.978187] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.985434] Stack: [ 29.987560] 0000000000000201 ffffffff836ca241 ffff8801d4427ae0 ffffffff81237f0d [ 29.995547] ffff8801d8770000 ffff8801d8770b58 ffff8801d8770058 ffff8801d8770b50 [ 30.003552] ffff8801d8770ab0 ffff8801d8770020 0000000000000000 0000000000000000 [ 30.011596] Call Trace: [ 30.014161] [] ? l2tp_session_get+0x1d1/0x790 [ 30.020279] [] ? trace_hardirqs_on+0xd/0x10 [ 30.026223] [] pppol2tp_connect+0x10d7/0x18f0 [ 30.032340] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 30.038548] [] ? security_socket_connect+0x8f/0xc0 [ 30.045105] [] SYSC_connect+0x1b8/0x300 [ 30.050793] [] ? SYSC_bind+0x280/0x280 [ 30.056307] [] ? do_futex+0x17c0/0x17c0 [ 30.061905] [] ? retint_kernel+0x2d/0x2d [ 30.067639] [] SyS_connect+0x24/0x30 [ 30.073027] [] ? SyS_accept+0x30/0x30 [ 30.078462] [] do_syscall_64+0x1a6/0x490 [ 30.084146] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.091039] 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 [ 30.118032] RIP [] l2tp_session_create+0xc60/0x16f0 [ 30.124792] RSP [ 30.128391] CR2: 0000000000000080 [ 30.132475] ---[ end trace b45880ada0e60612 ]--- [ 30.137217] Kernel panic - not syncing: Fatal exception [ 30.142846] Dumping ftrace buffer: [ 30.146361] (ftrace buffer empty) [ 30.150090] Kernel Offset: disabled [ 30.153697] Rebooting in 86400 seconds..