[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.169188] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.879478] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.159015] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.823575] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 25.007493] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 30.583838] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) 2018/08/27 00:08:29 parsed 1 programs [ 31.597482] random: cc1: uninitialized urandom read (8 bytes read, 72 bits of entropy available) 2018/08/27 00:08:31 executed programs: 0 [ 32.473477] IPVS: Creating netns size=2552 id=1 [ 32.716393] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.732106] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.814204] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 32.828994] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 32.911967] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 32.927914] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 32.944520] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.960675] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 33.693404] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.730845] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 34.069877] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 34.078228] IP: [] l2tp_session_create+0x948/0x1030 [ 34.084932] PGD 1cc01f067 PUD 1d8c62067 PMD 0 [ 34.089853] Oops: 0002 [#1] PREEMPT SMP KASAN [ 34.094807] Dumping ftrace buffer: [ 34.098320] (ftrace buffer empty) [ 34.102020] Modules linked in: [ 34.105332] CPU: 1 PID: 4128 Comm: syz-executor0 Not tainted 4.4.152-ge5c5f1f #89 [ 34.112921] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.122246] task: ffff8801d9a83000 task.stack: ffff8801d8730000 [ 34.128276] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 34.137384] RSP: 0018:ffff8801d8737b48 EFLAGS: 00010246 [ 34.142828] RAX: 0000000000000000 RBX: ffff8800b118af00 RCX: 0000000000000006 [ 34.150074] RDX: 1ffff10016231610 RSI: ffffffff835a4993 RDI: ffff8800b118b080 [ 34.157334] RBP: ffff8801d8737bb8 R08: 000000000000000a R09: 000000000000ffff [ 34.164578] R10: ffffed00162314b8 R11: ffffffff8463a140 R12: ffff8800b118a5a8 [ 34.171832] R13: ffff8801d8737cd0 R14: ffff8800b118a500 R15: ffffffff835a35c0 [ 34.179086] FS: 00007f5ad981e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.187283] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.193136] CR2: 0000000000000080 CR3: 00000001d8486000 CR4: 00000000001606f0 [ 34.200406] Stack: [ 34.202532] ffffffff81140a6a ffff8800b118af20 ffff8800b118a658 ffff8800b118a510 [ 34.210532] ffffffff838cbee0 ffff8800b118a5b0 ffff8800b118a650 ffff8800b118afe0 [ 34.218532] ffffffff00000000 ffff8801d8b66e80 0000000000000000 ffff8801d8b66eb0 [ 34.226514] Call Trace: [ 34.229079] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 34.235372] [] ? _raw_read_unlock_bh+0x30/0x40 [ 34.241581] [] pppol2tp_connect+0x10f0/0x1910 [ 34.247702] [] ? pppol2tp_recv+0x320/0x320 [ 34.253667] [] ? security_socket_connect+0x8f/0xc0 [ 34.260230] [] SYSC_connect+0x1b8/0x300 [ 34.265871] [] ? SYSC_bind+0x280/0x280 [ 34.271389] [] ? get_unused_fd_flags+0xd0/0xd0 [ 34.277598] [] ? do_futex+0x17f0/0x17f0 [ 34.283200] [] ? SyS_socket+0x121/0x1b0 [ 34.288871] [] ? move_addr_to_kernel+0x50/0x50 [ 34.295090] [] SyS_connect+0x24/0x30 [ 34.300436] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.307010] 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 [ 34.334406] RIP [] l2tp_session_create+0x948/0x1030 [ 34.341173] RSP [ 34.344775] CR2: 0000000000000080 [ 34.351146] ---[ end trace dd588d370e63cf6e ]--- [ 34.355917] Kernel panic - not syncing: Fatal exception [ 34.361643] Dumping ftrace buffer: [ 34.365168] (ftrace buffer empty) [ 34.368854] Kernel Offset: disabled [ 34.372452] Rebooting in 86400 seconds..