[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.195575] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.553473] random: sshd: uninitialized urandom read (32 bytes read) [ 19.935995] random: sshd: uninitialized urandom read (32 bytes read) [ 20.441347] random: sshd: uninitialized urandom read (32 bytes read) [ 20.581698] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 26.401573] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 01:44:59 parsed 1 programs [ 27.489373] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 01:45:01 executed programs: 0 [ 28.832805] IPVS: Creating netns size=2536 id=1 [ 28.959985] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 28.971222] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 29.016029] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 29.027541] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 29.071502] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 29.083051] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 29.094876] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 29.108080] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 29.614204] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 29.639514] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 29.645715] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 29.652392] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 29.870286] hrtimer: interrupt took 22121 ns [ 30.126108] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 30.231956] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 30.240295] IP: [] l2tp_session_create+0xc60/0x16f0 [ 30.246977] PGD 1d3ec7067 [ 30.249618] PUD 1d3f79067 PMD 0 [ 30.253226] [ 30.254860] Oops: 0002 [#1] PREEMPT SMP KASAN [ 30.259330] Dumping ftrace buffer: [ 30.262853] (ftrace buffer empty) [ 30.266566] Modules linked in: [ 30.269862] CPU: 1 PID: 4349 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 [ 30.277471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.286801] task: ffff8801d3ce1800 task.stack: ffff8801d3d40000 [ 30.292850] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 30.301967] RSP: 0018:ffff8801d3d47ac0 EFLAGS: 00010246 [ 30.307507] RAX: 0000000000000000 RBX: ffff8801d3eb8500 RCX: 1ffff1003a79c41d [ 30.314756] RDX: 1ffff1003a7d7170 RSI: ffff8801d3ce20c8 RDI: ffff8801d3eb8b80 [ 30.322113] RBP: ffff8801d3d47b60 R08: ffff8801d3ce20e8 R09: 0000000000000000 [ 30.329361] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3eb8a58 [ 30.336602] R13: 0000000000000000 R14: ffff8801d3eb8a00 R15: ffff8801d3d47c78 [ 30.343850] FS: 00007f8741d85700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.352046] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.357919] CR2: 0000000000000080 CR3: 00000001d566b000 CR4: 00000000001606f0 [ 30.365187] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.372433] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.379678] Stack: [ 30.381799] ffffffffffffff10 ffffffff8114bbd1 0000000000000010 0000000000000246 [ 30.389802] ffff8801d3eb8a00 ffff8801d3eb8658 ffff8801d3eb8a58 ffff8801d3eb8650 [ 30.397797] ffff8801d3eb85b0 ffff8801d3eb8a20 0000000000000000 0000000000000000 [ 30.405806] Call Trace: [ 30.408381] [] ? __local_bh_enable_ip+0x71/0xd0 [ 30.414679] [] pppol2tp_connect+0x10d7/0x18f0 [ 30.420804] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 30.427014] [] ? security_socket_connect+0x8f/0xc0 [ 30.433568] [] SYSC_connect+0x1b8/0x300 [ 30.439162] [] ? SYSC_bind+0x280/0x280 [ 30.444674] [] ? do_futex+0x17c0/0x17c0 [ 30.450303] [] ? move_addr_to_kernel+0x50/0x50 [ 30.456530] [] SyS_connect+0x24/0x30 [ 30.461869] [] ? SyS_accept+0x30/0x30 [ 30.467346] [] do_syscall_64+0x1a6/0x490 [ 30.473048] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.479943] 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 [ 30.507000] RIP [] l2tp_session_create+0xc60/0x16f0 [ 30.513772] RSP [ 30.517435] CR2: 0000000000000080 [ 30.522242] ---[ end trace baca0e7089d7287d ]--- [ 30.527324] Kernel panic - not syncing: Fatal exception [ 30.533022] Dumping ftrace buffer: [ 30.536540] (ftrace buffer empty) [ 30.540232] Kernel Offset: disabled [ 30.543862] Rebooting in 86400 seconds..