Nmap 7.8 Assertion failed: htn.toclock_running == true

[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,

[twkrol]

Same on my Windows 10 with freshly instaled nmap 7.8
Setting --max-parallelism to 10 or even 100 - helps.

[lpesyna]

I have some systems that I am unable to make work regardless of the max-parallelism setting. I've been forced to revert to 7.7. On Oct 4, 2019 4:08 AM, Tomasz Król <notifications@github.com> wrote: Same on my Windows 10 with freshly instaled nmap 7.8 Setting --max-parallelism to 10 helps. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#1764?email_source=notifications&email_token=ADYZ4PF6SVGLLIWMEZQBZ4LQM32XHA5CNFSM4I3KABB2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEAK3E7Y#issuecomment-538292863>, or mute the thread<https://github.com/notifications/unsubscribe-auth/ADYZ4PDCM2ASDXUKPWTNYUDQM32XHANCNFSM4I3KABBQ>.

[davidasailor]

I am having the same problem on my home network, scanning 192.168.1.0/24. Nmap version 7.80 on Fedora 31, run as root. Was not a problem until I updated to Fedora 31 this week (I presume Fedora 30 had an earlier Nmap version). It seems to be inconsistent, but fails more often than not. Does not seem to be affected by max-parallelism.

# nmap -V
Nmap version 7.80 ( https://nmap.org )
Platform: x86_64-redhat-linux-gnu
Compiled with: nmap-liblua-5.3.5 openssl-1.1.1c libssh2-1.9.0 libz-1.2.11 libpcre-8.43 libpcap-1.8.1 nmap-libdnet-1.12 ipv6
Compiled without:
Available nsock engines: epoll poll select

# nmap -vvv -sn -d --max-parallelism 10 192.168.1.0/24
Starting Nmap 7.80 ( https://nmap.org ) at 2019-12-27 11:45 EST
--------------- Timing report ---------------
  hostgroups: min 1, max 100000
  rtt-timeouts: init 1000, min 100, max 10000
  max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
  parallelism: min 0, max 10
  max-retries: 10, host-timeout: 0
  min-rate: 0, max-rate: 0
---------------------------------------------
Initiating ARP Ping Scan at 11:45
nmap: Target.cc:503: void Target::stopTimeOutClock(const timeval*): Assertion `htn.toclock_running == true' failed.

[phodina]

Same on my Mac OS (macOS 10.14.6)

# nmap -sS 192.168.1.1-254
Starting Nmap 7.80 ( https://nmap.org ) at 2020-02-05 16:18 CET
Assertion failed: (htn.toclock_running == true), function stopTimeOutClock, file Target.cc, line 503.
[1]    2485 abort      sudo nmap -sS 192.168.1.1-254

[xyxzxyz]

Same issue here on Win 10

[jpluimers]

Could this be This is indeed related to #1797 ? (I previously missed 33f421f that should fix this).

On Windows 10, this simple case already fails (similar to the Mac OS case above) some of the times:

nmap -sn 192.168.71.0/24

The suggested workaround to add --max-parallelism 100 works fine:

nmap -sn --max-parallelism 100 192.168.71.0/24

Note that :

• a Physical MacOS 10.13.6 machine on the same network does not exhibit the behaviour.
• Windows 7 Professional and Windows 8.1 Enterprise machines (both VM and Physical) on the same network do not exhibit the behaviour

[dmiller-nmap]

Duplicate of #1764, solved in 33f421f

[wgaylord]

Will a build with this fix be out soon for windows? Or do we have to build it to get this fix.

[marcingryska]

Will a build with this fix be out soon for windows? Or do we have to build it to get this fix.

Thumbs up for this important question. I also would like to know when this fix would be available in stable Windows version. We also encouterred such issue.

[ItsIgnacioPortal]

@bonsaiviking @dmiller-nmap new release for Windows pls

[amitai]

Will a build with this fix be out soon for windows? Or do we have to build it to get this fix.

Thumbs up for this important question. I also would like to know when this fix would be available in stable Windows version. We also encouterred such issue.

big same my friends

[fyodor]

Hi Folks. Our goal is to have a new Nmap release this month which would include this and all of the other fixes we've made since the last release. Cheers!