[....] 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[ 15.992005] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.612526] random: sshd: uninitialized urandom read (32 bytes read) [ 25.982229] random: sshd: uninitialized urandom read (32 bytes read) [ 26.356926] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 32.090443] urandom_read: 1 callbacks suppressed [ 32.090447] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 01:20:09 parsed 1 programs [ 33.073568] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 01:20:10 executed programs: 0 [ 34.092132] IPVS: Creating netns size=2536 id=1 [ 34.217442] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 34.229284] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 34.273288] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 34.284621] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 34.327682] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 34.339415] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 34.351636] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 34.363965] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 34.869760] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 34.895141] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 34.901433] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 34.908315] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 35.107051] hrtimer: interrupt took 20517 ns [ 35.111789] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 35.166069] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 35.174298] IP: [] l2tp_session_create+0xc60/0x16f0 [ 35.180992] PGD 1d7377067 [ 35.183631] PUD 1d711e067 PMD 0 [ 35.187109] [ 35.188726] Oops: 0002 [#1] PREEMPT SMP KASAN [ 35.193234] Dumping ftrace buffer: [ 35.196758] (ftrace buffer empty) [ 35.200461] Modules linked in: [ 35.203759] CPU: 0 PID: 4223 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 [ 35.211349] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.220677] task: ffff8801d7721800 task.stack: ffff8801d8560000 [ 35.226714] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 35.235863] RSP: 0018:ffff8801d8567ac0 EFLAGS: 00010246 [ 35.241289] RAX: 0000000000000000 RBX: ffff8801da260780 RCX: 1ffff1003aee441d [ 35.248532] RDX: 1ffff1003b44c030 RSI: ffff8801d77220c8 RDI: ffff8801da260180 [ 35.255839] RBP: ffff8801d8567b60 R08: ffff8801d77220e8 R09: 0000000000000000 [ 35.263091] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da260058 [ 35.270335] R13: 0000000000000000 R14: ffff8801da260000 R15: ffff8801d8567c78 [ 35.277583] FS: 00007fdf32de0700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.285841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.291702] CR2: 0000000000000080 CR3: 00000001d7058000 CR4: 00000000001606f0 [ 35.298944] Stack: [ 35.301065] 0000000000000201 ffffffff836ca141 ffff8801d8567ae0 ffffffff81237f0d [ 35.309061] ffff8801da260000 ffff8801da2608d8 ffff8801da260058 ffff8801da2608d0 [ 35.317055] ffff8801da260830 ffff8801da260020 0000000000000000 0000000000000000 [ 35.325040] Call Trace: [ 35.327605] [] ? l2tp_session_get+0x1d1/0x790 [ 35.333725] [] ? trace_hardirqs_on+0xd/0x10 [ 35.339671] [] pppol2tp_connect+0x10d7/0x18f0 [ 35.345790] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 35.351995] [] ? check_stack_object+0xd6/0x150 [ 35.358218] [] ? __sanitizer_cov_trace_pc+0x1/0x50 [ 35.364770] [] ? security_socket_connect+0x8f/0xc0 [ 35.371396] [] SYSC_connect+0x1b8/0x300 [ 35.377002] [] ? SYSC_bind+0x280/0x280 [ 35.382519] [] ? do_futex+0x17c0/0x17c0 [ 35.388117] [] ? fd_install+0x4d/0x60 [ 35.393543] [] SyS_connect+0x24/0x30 [ 35.398880] [] ? SyS_accept+0x30/0x30 [ 35.404310] [] do_syscall_64+0x1a6/0x490 [ 35.409998] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.416893] 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 [ 35.443768] RIP [] l2tp_session_create+0xc60/0x16f0 [ 35.450524] RSP [ 35.454120] CR2: 0000000000000080 [ 35.459801] ---[ end trace 4dfadddd3fdc6310 ]--- [ 35.464599] Kernel panic - not syncing: Fatal exception [ 35.470236] Dumping ftrace buffer: [ 35.473757] (ftrace buffer empty) [ 35.477440] Kernel Offset: disabled [ 35.481042] Rebooting in 86400 seconds..