[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.891995] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.535776] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 24.979116] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 25.683713] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 63.110265] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts. [ 68.581808] random: sshd: uninitialized urandom read (32 bytes read, 88 bits of entropy available) 2018/08/22 05:31:17 parsed 1 programs [ 69.768769] random: cc1: uninitialized urandom read (8 bytes read, 90 bits of entropy available) 2018/08/22 05:31:19 executed programs: 0 [ 71.077622] IPVS: Creating netns size=2552 id=1 [ 71.313970] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 71.329303] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 71.409680] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 71.425323] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 71.506172] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 71.521072] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 71.536860] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 71.554344] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 71.596890] ip (3835) used greatest stack depth: 24432 bytes left [ 72.295690] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 72.335249] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 72.699293] hrtimer: interrupt took 12454 ns [ 72.794227] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 73.091896] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 73.100293] IP: [] l2tp_session_create+0x948/0x1030 [ 73.106978] PGD babcd067 PUD b966d067 PMD 0 [ 73.111737] Oops: 0002 [#1] PREEMPT SMP KASAN [ 73.116771] Dumping ftrace buffer: [ 73.120286] (ftrace buffer empty) [ 73.123971] Modules linked in: [ 73.127258] CPU: 1 PID: 4260 Comm: syz-executor0 Not tainted 4.4.150-g5541782 #83 [ 73.134855] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.144187] task: ffff8801d8adb000 task.stack: ffff8800b9658000 [ 73.150349] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 73.159488] RSP: 0018:ffff8800b965fb48 EFLAGS: 00010246 [ 73.164912] RAX: 0000000000000000 RBX: ffff8801da190f00 RCX: 0000000000000006 [ 73.172276] RDX: 1ffff1003b432210 RSI: ffffffff835a3493 RDI: ffff8801da191080 [ 73.179521] RBP: ffff8800b965fbb8 R08: ffff8801d8adb900 R09: 0000000000000000 [ 73.186766] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da190aa8 [ 73.194121] R13: ffff8800b965fcd0 R14: ffff8801da190a00 R15: ffffffff835a20c0 [ 73.201381] FS: 00007f001c300700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 73.209683] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.215540] CR2: 0000000000000080 CR3: 00000000b98ae000 CR4: 00000000001606f0 [ 73.222885] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.230266] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.237510] Stack: [ 73.239632] ffffffff8114094a ffff8801da190f20 ffff8801da190b58 ffff8801da190a10 [ 73.247628] ffffffff838caa10 ffff8801da190ab0 ffff8801da190b50 ffff8801da190fe0 [ 73.255697] ffffffff00000000 ffff8800b9ac8880 0000000000000000 ffff8800b9ac88b0 [ 73.263680] Call Trace: [ 73.266249] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 73.272542] [] ? _raw_read_unlock_bh+0x30/0x40 [ 73.278758] [] pppol2tp_connect+0x10f0/0x1910 [ 73.284884] [] ? pppol2tp_recv+0x320/0x320 [ 73.290750] [] ? security_socket_connect+0x8f/0xc0 [ 73.297303] [] SYSC_connect+0x1b8/0x300 [ 73.302903] [] ? SYSC_perf_event_open+0x211/0x2470 [ 73.309459] [] ? SYSC_bind+0x280/0x280 [ 73.314969] [] ? get_unused_fd_flags+0xd0/0xd0 [ 73.321178] [] ? do_futex+0x17f0/0x17f0 [ 73.326902] [] ? move_addr_to_kernel+0x50/0x50 [ 73.333119] [] SyS_connect+0x24/0x30 [ 73.338468] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 73.345015] 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 [ 73.372498] RIP [] l2tp_session_create+0x948/0x1030 [ 73.379421] RSP [ 73.383017] CR2: 0000000000000080 [ 73.386923] ---[ end trace 39209a8b151e8010 ]--- [ 73.391733] Kernel panic - not syncing: Fatal exception [ 73.397511] Dumping ftrace buffer: [ 73.401027] (ftrace buffer empty) [ 73.404711] Kernel Offset: disabled [ 73.408311] Rebooting in 86400 seconds..