[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.764512] 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: [ 27.185432] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.655814] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.295124] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 28.477354] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. [ 33.957713] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) 2018/08/22 18:34:09 parsed 1 programs [ 35.222293] random: cc1: uninitialized urandom read (8 bytes read, 70 bits of entropy available) 2018/08/22 18:34:11 executed programs: 0 [ 36.813858] IPVS: Creating netns size=2552 id=1 [ 37.056400] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 37.070927] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 37.155452] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 37.169784] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 37.252142] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.266730] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.282999] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.299264] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 38.038004] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.075790] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.383171] hrtimer: interrupt took 45111 ns [ 38.951852] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.960203] IP: [] l2tp_session_create+0x948/0x1030 [ 38.966931] PGD b9196067 PUD bbab6067 PMD 0 [ 38.971849] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.976921] Dumping ftrace buffer: [ 38.980597] (ftrace buffer empty) [ 38.984416] Modules linked in: [ 38.987904] CPU: 0 PID: 4358 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 38.995811] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.005155] task: ffff8800b8c26000 task.stack: ffff8800b9180000 [ 39.011200] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 39.020335] RSP: 0018:ffff8800b9187b48 EFLAGS: 00010246 [ 39.025769] RAX: 0000000000000000 RBX: ffff8801d823d180 RCX: 0000000000000006 [ 39.033026] RDX: 1ffff1003b047a60 RSI: ffffffff835a4543 RDI: ffff8801d823d300 [ 39.040329] RBP: ffff8800b9187bb8 R08: ffff8800b8c26900 R09: 0000000000000000 [ 39.047586] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b9551728 [ 39.054845] R13: ffff8800b9187cd0 R14: ffff8800b9551680 R15: ffffffff835a3170 [ 39.062138] FS: 00007ff2d2213700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.070351] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.076218] CR2: 0000000000000080 CR3: 00000000b8f4d000 CR4: 00000000001606f0 [ 39.083528] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.090800] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.098060] Stack: [ 39.100203] ffffffff81140a6a ffff8801d823d1a0 ffff8800b95517d8 ffff8800b9551690 [ 39.108273] ffffffff838cba90 ffff8800b9551730 ffff8800b95517d0 ffff8801d823d260 [ 39.116393] ffffffff00000000 ffff8800b971a200 0000000000000000 ffff8800b971a230 [ 39.124628] Call Trace: [ 39.127256] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 39.133566] [] ? _raw_read_unlock_bh+0x30/0x40 [ 39.139787] [] pppol2tp_connect+0x10f0/0x1910 [ 39.145931] [] ? pppol2tp_recv+0x320/0x320 [ 39.151815] [] ? security_socket_connect+0x8f/0xc0 [ 39.158389] [] SYSC_connect+0x1b8/0x300 [ 39.164062] [] ? SYSC_perf_event_open+0x211/0x2470 [ 39.170694] [] ? SYSC_bind+0x280/0x280 [ 39.176286] [] ? get_unused_fd_flags+0xd0/0xd0 [ 39.182510] [] ? do_futex+0x17f0/0x17f0 [ 39.188122] [] ? move_addr_to_kernel+0x50/0x50 [ 39.194346] [] SyS_connect+0x24/0x30 [ 39.199707] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 39.206340] 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 [ 39.234398] RIP [] l2tp_session_create+0x948/0x1030 [ 39.241193] RSP [ 39.244820] CR2: 0000000000000080 [ 39.250836] ---[ end trace 9b47891a46d8e7f8 ]--- [ 39.255665] Kernel panic - not syncing: Fatal exception [ 39.261486] Dumping ftrace buffer: [ 39.265021] (ftrace buffer empty) [ 39.268716] Kernel Offset: disabled [ 39.272325] Rebooting in 86400 seconds..