Skip to content

Nmap 7.8 Assertion failed: htn.toclock_running == true #1764

Closed
@lpesyna

Description

@lpesyna

I am now getting this error when I attempt to do a full discovery sweep on our Class C systems. Using a local Windows 7 PC, no router hop, using syn scans as some devices do not respond to ping.

This is new to us in version 7.8, We have used these routines in version 7.7, 7.6, 6.x, and prior.

Assertion failed: htn.toclock_running == true, file ..\Target.cc, line 503

The command for a specific instance is as below.

"C:\Program Files (x86)\Nmap\nmap.exe" -v -T2 -p21,23,80 -n -oA c:\uploads\local -Pn --exclude 10.11.11.234,10.11.11.254 10.11.11.234/24

By trial an error I have found the threshold for triggering the error is a target range on or around 104 IP addresses. Setting --max-parallelism to 10 (random choice) prevents the error in the situations I tried.

Of course, I am unable to reproduce this in our lab environment, it only has occurred in our production subnets,

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions