[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.714159] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.828002] random: sshd: uninitialized urandom read (32 bytes read) [ 18.240331] random: sshd: uninitialized urandom read (32 bytes read) [ 18.753893] random: sshd: uninitialized urandom read (32 bytes read) [ 18.889965] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 24.459262] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 21:14:22 parsed 1 programs [ 25.766938] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 21:14:25 executed programs: 0 [ 27.839237] IPVS: Creating netns size=2536 id=1 [ 27.972549] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 27.984443] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 28.029209] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 28.041374] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 28.087608] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 28.099514] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 28.111401] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 28.125206] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 28.653695] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 28.680040] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 28.686409] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 28.694580] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 28.935849] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.949895] hrtimer: interrupt took 14007 ns [ 28.981568] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.006187] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 29.014462] IP: [] l2tp_session_create+0xc60/0x16f0 [ 29.021149] PGD 1d6e7b067 [ 29.023795] PUD 1da116067 PMD 0 [ 29.027268] [ 29.028891] Oops: 0002 [#1] PREEMPT SMP KASAN [ 29.033355] Dumping ftrace buffer: [ 29.036866] (ftrace buffer empty) [ 29.040563] Modules linked in: [ 29.043849] CPU: 1 PID: 4230 Comm: syz-executor0 Not tainted 4.9.123-g7fa8c15 #28 [ 29.051440] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.060769] task: ffff8801d682c800 task.stack: ffff8801d5060000 [ 29.066795] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 29.075899] RSP: 0018:ffff8801d5067ac0 EFLAGS: 00010246 [ 29.081359] RAX: 0000000000000000 RBX: ffff8801d6eb4280 RCX: 1ffff1003ad05a1d [ 29.088610] RDX: 1ffff1003add6920 RSI: ffff8801d682d0c8 RDI: ffff8801d6eb4900 [ 29.095852] RBP: ffff8801d5067b60 R08: ffff8801d682d0e8 R09: 0000000000000000 [ 29.103096] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6eb47d8 [ 29.110336] R13: 0000000000000000 R14: ffff8801d6eb4780 R15: ffff8801d5067c78 [ 29.117579] FS: 00007f3fb746e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.125974] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.131832] CR2: 0000000000000080 CR3: 00000001d6d73000 CR4: 00000000001606f0 [ 29.139081] Stack: [ 29.141210] 0000000000000201 ffffffff836ca241 ffff8801d5067ae0 ffffffff81237f0d [ 29.149217] ffff8801d6eb4780 ffff8801d6eb43d8 ffff8801d6eb47d8 ffff8801d6eb43d0 [ 29.157283] ffff8801d6eb4330 ffff8801d6eb47a0 0000000000000000 0000000000000000 [ 29.165441] Call Trace: [ 29.168007] [] ? l2tp_session_get+0x1d1/0x790 [ 29.174136] [] ? trace_hardirqs_on+0xd/0x10 [ 29.180329] [] pppol2tp_connect+0x10d7/0x18f0 [ 29.186459] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 29.192842] [] ? security_socket_connect+0x8f/0xc0 [ 29.199446] [] SYSC_connect+0x1b8/0x300 [ 29.205050] [] ? retint_kernel+0x2d/0x2d [ 29.210741] [] ? SYSC_bind+0x280/0x280 [ 29.216263] [] ? do_futex+0x17c0/0x17c0 [ 29.221928] [] ? retint_kernel+0x2d/0x2d [ 29.227629] [] SyS_connect+0x24/0x30 [ 29.232971] [] ? SyS_accept+0x30/0x30 [ 29.238403] [] do_syscall_64+0x1a6/0x490 [ 29.244096] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.250994] 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 [ 29.278265] RIP [] l2tp_session_create+0xc60/0x16f0 [ 29.285090] RSP [ 29.288693] CR2: 0000000000000080 [ 29.293297] ---[ end trace d951b70ec979a40f ]--- [ 29.298101] Kernel panic - not syncing: Fatal exception [ 29.303770] Dumping ftrace buffer: [ 29.307294] (ftrace buffer empty) [ 29.311133] Kernel Offset: disabled [ 29.314749] Rebooting in 86400 seconds..