Nmap not working any more -- probably after upgrade to Bullseye:


# nmap -sP -oG - 192.168.16.0/21
# Nmap 7.80 scan initiated Thu May  5 08:56:54 2022 as: nmap -sP -oG - 192.168.16.0/21
nmap: Target.cc:503: void Target::stopTimeOutClock(const timeval*): Assertion `htn.toclock_running == true' failed.
Aborted


# ip a
2: lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
     link/ether 00:e0:4c:68:0f:61 brd ff:ff:ff:ff:ff:ff
     inet 192.168.18.1/21 brd 192.168.23.255 scope global lan
        valid_lft forever preferred_lft forever


# nmap --version
Nmap version 7.80 (https://nmap.org  )
Platform: x86_64-pc-linux-gnu
Compiled with: liblua-5.3.3 openssl-1.1.1j libssh2-1.9.0 libz-1.2.11 libpcre-8.39 libpcap-1.10.0 nmap-libdnet-1.12 ipv6
Compiled without:
Available nsock engines: epoll poll select