[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.394786] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.231734] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.558870] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.333268] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) [ 28.534544] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 34.120266] random: sshd: uninitialized urandom read (32 bytes read, 88 bits of entropy available) 2018/08/22 23:03:11 parsed 1 programs [ 35.296435] random: cc1: uninitialized urandom read (8 bytes read, 90 bits of entropy available) 2018/08/22 23:03:13 executed programs: 0 [ 36.631507] IPVS: Creating netns size=2552 id=1 [ 36.867797] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 36.881893] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 36.961846] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 36.976896] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 37.055378] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.069256] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.085574] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.102196] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 37.818773] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.857636] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.141641] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.149895] IP: [] l2tp_session_create+0x948/0x1030 [ 38.156590] PGD 1c9519067 PUD 1d8127067 PMD 0 [ 38.161513] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.166470] Dumping ftrace buffer: [ 38.169982] (ftrace buffer empty) [ 38.173668] Modules linked in: [ 38.176960] CPU: 0 PID: 4204 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 38.184574] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.193907] task: ffff8800b9aa0000 task.stack: ffff8801d9588000 [ 38.200266] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 38.209469] RSP: 0018:ffff8801d958fb48 EFLAGS: 00010246 [ 38.214893] RAX: 0000000000000000 RBX: ffff8800b9508a00 RCX: 0000000000000006 [ 38.222139] RDX: 1ffff100172a1170 RSI: ffffffff835a4543 RDI: ffff8800b9508b80 [ 38.229385] RBP: ffff8801d958fbb8 R08: ffff8800b9aa0900 R09: 0000000000000000 [ 38.236629] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b9508fa8 [ 38.243876] R13: ffff8801d958fcd0 R14: ffff8800b9508f00 R15: ffffffff835a3170 [ 38.251137] FS: 00007ff3199d9700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.259342] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.265214] CR2: 0000000000000080 CR3: 00000001c951c000 CR4: 00000000001606f0 [ 38.272464] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.279724] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.286968] Stack: [ 38.289092] ffffffff81140a6a ffff8800b9508a20 ffff8800b9509058 ffff8800b9508f10 [ 38.297084] ffffffff838cba90 ffff8800b9508fb0 ffff8800b9509050 ffff8800b9508ae0 [ 38.305067] ffffffff00000000 ffff8801d6d88000 0000000000000000 ffff8801d6d88030 [ 38.313068] Call Trace: [ 38.315643] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 38.321942] [] ? _raw_read_unlock_bh+0x30/0x40 [ 38.328156] [] pppol2tp_connect+0x10f0/0x1910 [ 38.334282] [] ? pppol2tp_recv+0x320/0x320 [ 38.340160] [] ? security_socket_connect+0x8f/0xc0 [ 38.346715] [] SYSC_connect+0x1b8/0x300 [ 38.352315] [] ? SYSC_bind+0x280/0x280 [ 38.357838] [] ? get_unused_fd_flags+0xd0/0xd0 [ 38.364049] [] ? do_futex+0x17f0/0x17f0 [ 38.369654] [] ? SyS_dup2+0x3c5/0x5e0 [ 38.375095] [] SyS_connect+0x24/0x30 [ 38.380443] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 38.386992] 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 [ 38.413838] RIP [] l2tp_session_create+0x948/0x1030 [ 38.420618] RSP [ 38.424227] CR2: 0000000000000080 [ 38.430017] ---[ end trace d9ba82b096657398 ]--- [ 38.434790] Kernel panic - not syncing: Fatal exception [ 38.440501] Dumping ftrace buffer: [ 38.444017] (ftrace buffer empty) [ 38.447701] Kernel Offset: disabled [ 38.451299] Rebooting in 86400 seconds..