[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.439156] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.750052] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.073909] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.808952] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 21.990629] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. [ 27.480809] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) 2018/08/29 10:04:49 parsed 1 programs [ 28.477366] random: cc1: uninitialized urandom read (8 bytes read, 75 bits of entropy available) 2018/08/29 10:04:51 executed programs: 0 [ 29.727522] IPVS: Creating netns size=2552 id=1 [ 29.966317] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 29.981215] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.064103] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.078718] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.161281] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.175322] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.191964] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.209643] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.961689] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.998466] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.290915] hrtimer: interrupt took 26077 ns [ 31.729959] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 31.738207] IP: [] l2tp_session_create+0x948/0x1030 [ 31.744899] PGD b678b067 PUD babe3067 PMD 0 [ 31.749647] Oops: 0002 [#1] PREEMPT SMP KASAN [ 31.754584] Dumping ftrace buffer: [ 31.758098] (ftrace buffer empty) [ 31.761781] Modules linked in: [ 31.765065] CPU: 1 PID: 4261 Comm: syz-executor0 Not tainted 4.4.153-g5e24b4e #90 [ 31.772653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.781982] task: ffff8801d7cc8000 task.stack: ffff8800b9a68000 [ 31.788011] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 31.797121] RSP: 0018:ffff8800b9a6fb48 EFLAGS: 00010246 [ 31.802542] RAX: 0000000000000000 RBX: ffff8800b9724280 RCX: 0000000000000006 [ 31.809788] RDX: 1ffff100172e4880 RSI: ffffffff835a4c93 RDI: ffff8800b9724400 [ 31.817037] RBP: ffff8800b9a6fbb8 R08: 000000000000000a R09: 000000000000ffff [ 31.824300] R10: ffffed003b468a98 R11: ffffffff8463a200 R12: ffff8801da3454a8 [ 31.831549] R13: ffff8800b9a6fcd0 R14: ffff8801da345400 R15: ffffffff835a38c0 [ 31.838801] FS: 00007f9d3d699700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.847008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.852866] CR2: 0000000000000080 CR3: 00000000b1587000 CR4: 00000000001606f0 [ 31.860114] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.867358] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.874600] Stack: [ 31.876724] ffffffff81140aba ffff8800b97242a0 ffff8801da345558 ffff8801da345410 [ 31.884706] ffffffff838cc1e0 ffff8801da3454b0 ffff8801da345550 ffff8800b9724360 [ 31.892687] ffffffff00000000 ffff8800b9916600 0000000000000000 ffff8800b9916630 [ 31.900672] Call Trace: [ 31.903235] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 31.909533] [] ? _raw_read_unlock_bh+0x30/0x40 [ 31.915740] [] pppol2tp_connect+0x10f0/0x1910 [ 31.921858] [] ? pppol2tp_recv+0x320/0x320 [ 31.927718] [] ? security_socket_connect+0x8f/0xc0 [ 31.934270] [] SYSC_connect+0x1b8/0x300 [ 31.939870] [] ? SYSC_perf_event_open+0x211/0x2470 [ 31.946433] [] ? SYSC_bind+0x280/0x280 [ 31.951945] [] ? get_unused_fd_flags+0xd0/0xd0 [ 31.958154] [] ? do_futex+0x17f0/0x17f0 [ 31.963755] [] ? move_addr_to_kernel+0x50/0x50 [ 31.969959] [] SyS_connect+0x24/0x30 [ 31.975313] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.981918] 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 [ 32.008745] RIP [] l2tp_session_create+0x948/0x1030 [ 32.015504] RSP [ 32.019104] CR2: 0000000000000080 [ 32.023305] ---[ end trace 2424866ea0a8d9c7 ]--- [ 32.028189] Kernel panic - not syncing: Fatal exception [ 32.033872] Dumping ftrace buffer: [ 32.037400] (ftrace buffer empty) [ 32.041109] Kernel Offset: disabled [ 32.044709] Rebooting in 86400 seconds..