[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.730896] 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: [ 24.814101] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.225925] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 25.968910] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) [ 26.134027] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 31.798006] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) 2018/08/29 04:32:21 parsed 1 programs [ 32.941938] random: cc1: uninitialized urandom read (8 bytes read, 88 bits of entropy available) 2018/08/29 04:32:23 executed programs: 0 [ 34.051572] IPVS: Creating netns size=2552 id=1 [ 34.288636] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 34.304535] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 34.383799] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 34.398226] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 34.477983] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 34.493021] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 34.509801] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 34.527321] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 35.244531] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 35.286150] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 2018/08/29 04:32:28 executed programs: 308 [ 39.930984] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 [ 40.393087] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 40.401584] IP: [] l2tp_session_create+0x948/0x1030 [ 40.408477] PGD b4be1067 PUD b4a88067 PMD 0 [ 40.413410] Oops: 0002 [#1] PREEMPT SMP KASAN [ 40.418526] Dumping ftrace buffer: [ 40.422059] (ftrace buffer empty) [ 40.425763] Modules linked in: [ 40.429179] CPU: 0 PID: 5626 Comm: syz-executor0 Not tainted 4.4.153-g5e24b4e #90 [ 40.436996] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.446657] task: ffff8801cc843000 task.stack: ffff8800b0a78000 [ 40.452709] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 40.461860] RSP: 0018:ffff8800b0a7fb48 EFLAGS: 00010246 [ 40.467301] RAX: 0000000000000000 RBX: ffff8800b4ad0780 RCX: 0000000000000006 [ 40.474564] RDX: 1ffff1001695a120 RSI: ffffffff835a4c93 RDI: ffff8800b4ad0900 [ 40.481828] RBP: ffff8800b0a7fbb8 R08: 000000000000000a R09: 000000000000ffff [ 40.489144] R10: ffffed0039a3df38 R11: ffffffff8463a200 R12: ffff8801cd1ef9a8 [ 40.496434] R13: ffff8800b0a7fcd0 R14: ffff8801cd1ef900 R15: ffffffff835a38c0 [ 40.503698] FS: 00007f5dd4090700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 40.511917] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.517789] CR2: 0000000000000080 CR3: 00000000b1cb2000 CR4: 00000000001606f0 [ 40.525059] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.532690] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.539953] Stack: [ 40.542103] ffffffff81140aba ffff8800b4ad07a0 ffff8801cd1efa58 ffff8801cd1ef910 [ 40.550270] ffffffff838cc1e0 ffff8801cd1ef9b0 ffff8801cd1efa50 ffff8800b4ad0860 [ 40.558435] ffffffff00000000 ffff8800b42f1980 0000000000000000 ffff8800b42f19b0 [ 40.566710] Call Trace: [ 40.569299] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 40.575615] [] ? _raw_read_unlock_bh+0x30/0x40 [ 40.581871] [] pppol2tp_connect+0x10f0/0x1910 [ 40.588013] [] ? pppol2tp_recv+0x320/0x320 [ 40.593904] [] ? security_socket_connect+0x8f/0xc0 [ 40.600612] [] SYSC_connect+0x1b8/0x300 [ 40.606259] [] ? SYSC_bind+0x280/0x280 [ 40.611959] [] ? get_unused_fd_flags+0xd0/0xd0 [ 40.618204] [] ? do_futex+0x17f0/0x17f0 [ 40.623939] [] ? SyS_socket+0x121/0x1b0 [ 40.629572] [] ? move_addr_to_kernel+0x50/0x50 [ 40.635806] [] SyS_connect+0x24/0x30 [ 40.641175] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 40.647779] 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 [ 40.676245] RIP [] l2tp_session_create+0x948/0x1030 [ 40.683044] RSP [ 40.686781] CR2: 0000000000000080 [ 40.690767] ---[ end trace 138bf6d445bee133 ]--- [ 40.696122] Kernel panic - not syncing: Fatal exception [ 40.701976] Dumping ftrace buffer: [ 40.705526] (ftrace buffer empty) [ 40.709228] Kernel Offset: disabled [ 40.712845] Rebooting in 86400 seconds..