[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.185581] 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: [ 24.152021] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.432482] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.153632] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 25.338589] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 30.935199] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) 2018/08/22 15:42:58 parsed 1 programs [ 31.961977] random: cc1: uninitialized urandom read (8 bytes read, 81 bits of entropy available) 2018/08/22 15:43:00 executed programs: 0 [ 33.260692] IPVS: Creating netns size=2552 id=1 [ 33.353321] ip (3766) used greatest stack depth: 24336 bytes left [ 33.506679] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 33.521942] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 33.606441] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 33.623296] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 33.703988] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 33.719478] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 33.734244] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 33.751581] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 34.475251] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 34.513225] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 35.209225] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 35.217486] IP: [] l2tp_session_create+0x948/0x1030 [ 35.224166] PGD 1d8370067 PUD 1d8237067 PMD 0 [ 35.229091] Oops: 0002 [#1] PREEMPT SMP KASAN [ 35.234056] Dumping ftrace buffer: [ 35.237574] (ftrace buffer empty) [ 35.241260] Modules linked in: [ 35.244545] CPU: 0 PID: 4229 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 35.252146] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.261484] task: ffff8800b9a59800 task.stack: ffff8801d7e80000 [ 35.267522] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 35.276637] RSP: 0018:ffff8801d7e87b48 EFLAGS: 00010246 [ 35.282063] RAX: 0000000000000000 RBX: ffff8801d827c000 RCX: 0000000000000006 [ 35.289309] RDX: 1ffff1003b04f830 RSI: ffffffff835a4543 RDI: ffff8801d827c180 [ 35.296555] RBP: ffff8801d7e87bb8 R08: ffff8800b9a5a100 R09: 0000000000000000 [ 35.303819] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d833d9a8 [ 35.311064] R13: ffff8801d7e87cd0 R14: ffff8801d833d900 R15: ffffffff835a3170 [ 35.318309] FS: 00007f22fb99f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.326507] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.332361] CR2: 0000000000000080 CR3: 00000001cd2e3000 CR4: 00000000001606f0 [ 35.339607] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.346868] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.354118] Stack: [ 35.356248] ffffffff81140a6a ffff8801d827c020 ffff8801d833da58 ffff8801d833d910 [ 35.364231] ffffffff838cba90 ffff8801d833d9b0 ffff8801d833da50 ffff8801d827c0e0 [ 35.372230] ffffffff00000000 ffff8801d2442200 0000000000000000 ffff8801d2442230 [ 35.380218] Call Trace: [ 35.382781] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 35.389078] [] ? _raw_read_unlock_bh+0x30/0x40 [ 35.395289] [] pppol2tp_connect+0x10f0/0x1910 [ 35.401419] [] ? pppol2tp_recv+0x320/0x320 [ 35.407289] [] ? security_socket_connect+0x8f/0xc0 [ 35.413853] [] SYSC_connect+0x1b8/0x300 [ 35.419462] [] ? SYSC_bind+0x280/0x280 [ 35.424982] [] ? get_unused_fd_flags+0xd0/0xd0 [ 35.431204] [] ? do_futex+0x17f0/0x17f0 [ 35.436821] [] ? SyS_socket+0x121/0x1b0 [ 35.442434] [] ? move_addr_to_kernel+0x50/0x50 [ 35.448667] [] SyS_connect+0x24/0x30 [ 35.448678] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.448788] 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 [ 35.448799] RIP [] l2tp_session_create+0x948/0x1030 [ 35.448801] RSP [ 35.448804] CR2: 0000000000000080 [ 35.450714] ---[ end trace 4e588123037f348a ]--- [ 35.450719] Kernel panic - not syncing: Fatal exception [ 35.454346] Dumping ftrace buffer: [ 35.454350] (ftrace buffer empty) [ 35.454352] Kernel Offset: disabled [ 35.514340] Rebooting in 86400 seconds..