[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.065450] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.161648] random: sshd: uninitialized urandom read (32 bytes read) [ 19.529052] random: sshd: uninitialized urandom read (32 bytes read) [ 20.052580] random: sshd: uninitialized urandom read (32 bytes read) [ 20.197675] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 25.698784] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 21:44:31 parsed 1 programs [ 26.673222] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 21:44:32 executed programs: 0 [ 27.893986] IPVS: Creating netns size=2536 id=1 [ 28.022375] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 28.033990] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 28.078500] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 28.089914] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 28.134581] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 28.146440] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 28.159199] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 28.172710] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 28.693629] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 28.719444] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 28.725761] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 28.732589] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 28.939534] hrtimer: interrupt took 16360 ns [ 29.068612] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 29.076935] IP: [] l2tp_session_create+0xc60/0x16f0 [ 29.083657] PGD 1d98f4067 [ 29.086368] PUD 1d8734067 PMD 0 [ 29.089870] [ 29.091491] Oops: 0002 [#1] PREEMPT SMP KASAN [ 29.095964] Dumping ftrace buffer: [ 29.099479] (ftrace buffer empty) [ 29.103167] Modules linked in: [ 29.106459] CPU: 0 PID: 4250 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 [ 29.114048] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.123375] task: ffff8801d62a8000 task.stack: ffff8801d68a8000 [ 29.129402] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 29.138531] RSP: 0018:ffff8801d68afac0 EFLAGS: 00010246 [ 29.143957] RAX: 0000000000000000 RBX: ffff8801da30e780 RCX: 1ffff1003ac5511d [ 29.151200] RDX: 1ffff1003b31aab0 RSI: ffff8801d62a88c8 RDI: ffff8801d98d5580 [ 29.158448] RBP: ffff8801d68afb60 R08: ffff8801d62a88e8 R09: 0000000000000000 [ 29.165690] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d98d5458 [ 29.172930] R13: 0000000000000000 R14: ffff8801d98d5400 R15: ffff8801d68afc78 [ 29.180431] FS: 00007f55b5f40700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.188633] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.194487] CR2: 0000000000000080 CR3: 00000001da321000 CR4: 00000000001606f0 [ 29.201736] Stack: [ 29.203856] 0000000000000201 ffffffff836ca141 ffff8801d68afae0 ffffffff81237f0d [ 29.211864] ffff8801d98d5400 ffff8801da30e8d8 ffff8801d98d5458 ffff8801da30e8d0 [ 29.219843] ffff8801da30e830 ffff8801d98d5420 0000000000000000 0000000000000000 [ 29.227827] Call Trace: [ 29.230388] [] ? l2tp_session_get+0x1d1/0x790 [ 29.236513] [] ? trace_hardirqs_on+0xd/0x10 [ 29.242457] [] pppol2tp_connect+0x10d7/0x18f0 [ 29.248576] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 29.254783] [] ? security_socket_connect+0x8f/0xc0 [ 29.261351] [] SYSC_connect+0x1b8/0x300 [ 29.266946] [] ? SYSC_bind+0x280/0x280 [ 29.272475] [] ? do_futex+0x17c0/0x17c0 [ 29.278079] [] ? retint_kernel+0x2d/0x2d [ 29.283769] [] ? perf_bp_event+0x180/0x180 [ 29.289628] [] SyS_connect+0x24/0x30 [ 29.294971] [] ? SyS_accept+0x30/0x30 [ 29.300400] [] do_syscall_64+0x1a6/0x490 [ 29.306149] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.313050] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 29.340109] RIP [] l2tp_session_create+0xc60/0x16f0 [ 29.346877] RSP [ 29.350480] CR2: 0000000000000080 [ 29.355037] ---[ end trace 258499dbad01c2f7 ]--- [ 29.360146] Kernel panic - not syncing: Fatal exception [ 29.365741] Dumping ftrace buffer: [ 29.369263] (ftrace buffer empty) [ 29.372949] Kernel Offset: disabled [ 29.376551] Rebooting in 86400 seconds..