[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.906543] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.237099] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.471165] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.155729] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 104.195381] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 109.762160] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) 2018/08/23 04:05:22 parsed 1 programs [ 111.090656] random: cc1: uninitialized urandom read (8 bytes read, 97 bits of entropy available) 2018/08/23 04:05:24 executed programs: 0 [ 112.398903] IPVS: Creating netns size=2552 id=1 [ 112.646506] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 112.661169] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 112.744847] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 112.759088] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 112.842656] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 112.856740] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 112.872475] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 112.890635] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 113.629334] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 113.666967] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 114.007269] hrtimer: interrupt took 15080 ns [ 114.044931] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 114.053270] IP: [] l2tp_session_create+0x948/0x1030 [ 114.059951] PGD b9567067 PUD ba400067 PMD 0 [ 114.064689] Oops: 0002 [#1] PREEMPT SMP KASAN [ 114.069625] Dumping ftrace buffer: [ 114.073216] (ftrace buffer empty) [ 114.076910] Modules linked in: [ 114.080203] CPU: 1 PID: 4230 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #85 [ 114.087902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 114.097237] task: ffff8801d6904800 task.stack: ffff8800b9a80000 [ 114.103270] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 114.112395] RSP: 0018:ffff8800b9a87b48 EFLAGS: 00010246 [ 114.117838] RAX: 0000000000000000 RBX: ffff8801d81d9400 RCX: 0000000000000006 [ 114.125085] RDX: 1ffff1003b03b2b0 RSI: ffffffff835a4543 RDI: ffff8801d81d9580 [ 114.132336] RBP: ffff8800b9a87bb8 R08: ffff8801d6905100 R09: 0000000000000000 [ 114.139585] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d86daaa8 [ 114.146943] R13: ffff8800b9a87cd0 R14: ffff8801d86daa00 R15: ffffffff835a3170 [ 114.154193] FS: 00007f410884f700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 114.162399] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 114.168255] CR2: 0000000000000080 CR3: 00000000b9316000 CR4: 00000000001606f0 [ 114.175571] Stack: [ 114.177706] ffffffff81140a6a ffff8801d81d9420 ffff8801d86dab58 ffff8801d86daa10 [ 114.185716] ffffffff838cba90 ffff8801d86daab0 ffff8801d86dab50 ffff8801d81d94e0 [ 114.193744] ffffffff00000000 ffff8801d7a82200 0000000000000000 ffff8801d7a82230 [ 114.201988] Call Trace: [ 114.204561] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 114.210863] [] ? _raw_read_unlock_bh+0x30/0x40 [ 114.217081] [] pppol2tp_connect+0x10f0/0x1910 [ 114.223204] [] ? pppol2tp_recv+0x320/0x320 [ 114.229078] [] ? security_socket_connect+0x8f/0xc0 [ 114.235738] [] SYSC_connect+0x1b8/0x300 [ 114.241340] [] ? SYSC_bind+0x280/0x280 [ 114.246874] [] ? get_unused_fd_flags+0xd0/0xd0 [ 114.253131] [] ? do_futex+0x17f0/0x17f0 [ 114.258734] [] ? SyS_socket+0x121/0x1b0 [ 114.264334] [] ? move_addr_to_kernel+0x50/0x50 [ 114.270540] [] SyS_connect+0x24/0x30 [ 114.275988] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 114.282540] 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 [ 114.309576] RIP [] l2tp_session_create+0x948/0x1030 [ 114.316342] RSP [ 114.319941] CR2: 0000000000000080 [ 114.324624] ---[ end trace 0dd9fbba24f39e0a ]--- [ 114.331082] Kernel panic - not syncing: Fatal exception [ 114.336723] Dumping ftrace buffer: [ 114.340249] (ftrace buffer empty) [ 114.343936] Kernel Offset: disabled [ 114.347566] Rebooting in 86400 seconds..