[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.169174] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.083506] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.402131] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 26.069229] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 37.106241] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 42.844494] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) 2018/08/22 15:23:10 parsed 1 programs [ 44.638746] random: cc1: uninitialized urandom read (8 bytes read, 78 bits of entropy available) 2018/08/22 15:23:13 executed programs: 0 [ 46.285451] IPVS: Creating netns size=2552 id=1 [ 46.531439] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.546096] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.630536] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.646107] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.731111] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.746822] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.764021] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 46.781456] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 46.824889] ip (3808) used greatest stack depth: 23504 bytes left [ 47.513591] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 47.552368] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 47.887041] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 47.937397] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 47.977620] hrtimer: interrupt took 27891 ns [ 48.097610] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 49.577820] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 50.272731] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 50.280986] IP: [] l2tp_session_create+0x948/0x1030 [ 50.287720] PGD b6a73067 PUD b7b43067 PMD 0 [ 50.292496] Oops: 0002 [#1] PREEMPT SMP KASAN [ 50.297481] Dumping ftrace buffer: [ 50.301015] (ftrace buffer empty) [ 50.304708] Modules linked in: [ 50.307996] CPU: 0 PID: 4586 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 50.315590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.324924] task: ffff8801d4134800 task.stack: ffff8800b6a30000 [ 50.330953] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 50.340066] RSP: 0018:ffff8800b6a37ad0 EFLAGS: 00010246 [ 50.345514] RAX: 0000000000000000 RBX: ffff8801d3b1e280 RCX: 0000000000000006 [ 50.352760] RDX: 1ffff1003a763c80 RSI: ffffffff835a4543 RDI: ffff8801d3b1e400 [ 50.360017] RBP: ffff8800b6a37b40 R08: ffff8801d4135100 R09: 0000000000000000 [ 50.367265] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d3a18328 [ 50.374545] R13: ffff8800b6a37c58 R14: ffff8801d3a18280 R15: ffffffff835a3170 [ 50.381801] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77d6b40 [ 50.390004] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 50.395862] CR2: 0000000000000080 CR3: 00000000b6ad6000 CR4: 00000000001606f0 [ 50.403119] Stack: [ 50.405256] ffffffff81140a6a ffff8801d3b1e2a0 ffff8801d3a183d8 ffff8801d3a18290 [ 50.413261] ffffffff838cba90 ffff8801d3a18330 ffff8801d3a183d0 ffff8801d3b1e360 [ 50.421291] ffffffff00000000 ffff8800b6eadd80 0000000000000000 ffff8800b6eaddb0 [ 50.429333] Call Trace: [ 50.431913] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 50.438216] [] ? _raw_read_unlock_bh+0x30/0x40 [ 50.444427] [] pppol2tp_connect+0x10f0/0x1910 [ 50.450571] [] ? pppol2tp_recv+0x320/0x320 [ 50.456434] [] ? security_socket_connect+0x8f/0xc0 [ 50.462995] [] SYSC_connect+0x1b8/0x300 [ 50.468599] [] ? SYSC_perf_event_open+0x211/0x2470 [ 50.475154] [] ? SYSC_bind+0x280/0x280 [ 50.480679] [] ? get_unused_fd_flags+0xd0/0xd0 [ 50.486906] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 50.493896] [] ? move_addr_to_kernel+0x50/0x50 [ 50.500124] [] SyS_connect+0x24/0x30 [ 50.505490] [] ? SyS_accept+0x30/0x30 [ 50.510920] [] do_fast_syscall_32+0x324/0x8b0 [ 50.517044] [] sysenter_flags_fixed+0xd/0x1a [ 50.523076] Code: 00 00 48 8d bb 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 36 06 00 00 48 8b 83 80 01 00 00 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 50.550132] RIP [] l2tp_session_create+0x948/0x1030 [ 50.556921] RSP [ 50.560520] CR2: 0000000000000080 [ 50.564337] ---[ end trace 6dd89698b77aebdd ]--- [ 50.569085] Kernel panic - not syncing: Fatal exception [ 50.574727] Dumping ftrace buffer: [ 50.578281] (ftrace buffer empty) [ 50.581968] Kernel Offset: disabled [ 50.585568] Rebooting in 86400 seconds..