[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.394036] 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: [ 24.438593] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.762666] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.422386] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 29.953520] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. [ 35.549005] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) 2018/08/25 08:40:36 parsed 1 programs [ 36.580060] random: cc1: uninitialized urandom read (8 bytes read, 70 bits of entropy available) 2018/08/25 08:40:38 executed programs: 0 [ 37.656893] IPVS: Creating netns size=2552 id=1 [ 37.897561] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 37.913620] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 37.997598] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 38.013365] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 38.096419] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 38.112192] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 38.127818] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 38.144823] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 38.882319] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.922190] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 39.201150] hrtimer: interrupt took 18602 ns [ 39.301296] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 40.896472] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 41.608797] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 41.617074] IP: [] l2tp_session_create+0x948/0x1030 [ 41.623788] PGD 1d370e067 PUD 1d9845067 PMD 0 [ 41.628768] Oops: 0002 [#1] PREEMPT SMP KASAN [ 41.633787] Dumping ftrace buffer: [ 41.637318] (ftrace buffer empty) [ 41.641020] Modules linked in: [ 41.644041] CPU: 0 PID: 4752 Comm: syz-executor0 Not tainted 4.4.152-ge5c5f1f #89 [ 41.644045] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.644050] task: ffff8800b5c8e000 task.stack: ffff8801c9718000 [ 41.644054] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 41.644069] RSP: 0018:ffff8801c971fb48 EFLAGS: 00010246 [ 41.644073] RAX: 0000000000000000 RBX: ffff8801d2ab8780 RCX: 0000000000000006 [ 41.644077] RDX: 1ffff1003a557120 RSI: ffffffff835a4993 RDI: ffff8801d2ab8900 [ 41.644080] RBP: ffff8801c971fbb8 R08: 000000000000000a R09: 000000000000ffff [ 41.644084] R10: ffffed003a600d08 R11: ffffffff8463a140 R12: ffff8801d3006828 [ 41.644088] R13: ffff8801c971fcd0 R14: ffff8801d3006780 R15: ffffffff835a35c0 [ 41.644094] FS: 00007f187c323700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 41.644098] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.644102] CR2: 0000000000000080 CR3: 00000001d4ba6000 CR4: 00000000001606f0 [ 41.644108] Stack: [ 41.644118] ffffffff81140a6a ffff8801d2ab87a0 ffff8801d30068d8 ffff8801d3006790 [ 41.644127] ffffffff838cbee0 ffff8801d3006830 ffff8801d30068d0 ffff8801d2ab8860 [ 41.644136] ffffffff00000000 ffff8800b5bdd500 0000000000000000 ffff8800b5bdd530 [ 41.644138] Call Trace: [ 41.644148] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 41.644158] [] ? _raw_read_unlock_bh+0x30/0x40 [ 41.644166] [] pppol2tp_connect+0x10f0/0x1910 [ 41.644174] [] ? pppol2tp_recv+0x320/0x320 [ 41.644186] [] ? security_socket_connect+0x8f/0xc0 [ 41.644194] [] SYSC_connect+0x1b8/0x300 [ 41.644204] [] ? SYSC_perf_event_open+0x211/0x2470 [ 41.644211] [] ? SYSC_bind+0x280/0x280 [ 41.644218] [] ? get_unused_fd_flags+0xd0/0xd0 [ 41.644228] [] ? do_futex+0x17f0/0x17f0 [ 41.644236] [] ? retint_user+0x18/0x3c [ 41.644245] [] SyS_connect+0x24/0x30 [ 41.644253] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 41.644365] 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 [ 41.644374] RIP [] l2tp_session_create+0x948/0x1030 [ 41.644376] RSP [ 41.644379] CR2: 0000000000000080 [ 41.647281] ---[ end trace ce3d9ef205dfcebb ]--- [ 41.647286] Kernel panic - not syncing: Fatal exception [ 41.652265] Dumping ftrace buffer: [ 41.652269] (ftrace buffer empty) [ 41.652271] Kernel Offset: disabled [ 41.898307] Rebooting in 86400 seconds..