Public bug reported:
On a Linux (Ubuntu 16.04) box with no listener on port 8095, I type this
echo 1 | nc -u -w 1 127.0.0.1 8095
and the command does not return. On my workstation (Ubuntu 17.10), where
also nothing listens on 8095, NC returns immediately, which is what I'd
expect.
Adding the -v flag causes nc to return immediately (with status 1 rather
than 0).
I would expect sending a UDP packet always to succeed quickly if a
network interface exists.
Note that this behaviour does not exist in netcat 1.178 (on ubuntu
17.10), so this is only a bug against the version still running in
16.04.4 LTS.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: netcat (not installed)
ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
Uname: Linux 4.4.0-116-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Sun Feb 25 08:39:54 2018
JournalErrors:
Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000']
failed with exit code 1: Hint: You are currently not seeing messages from other
users and the system.
Users in the 'systemd-journal' group can see all messages. Pass -q to
turn off this notice.
No journal files were opened due to insufficient permissions.
SourcePackage: netcat
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: netcat (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug uec-images xenial
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https://bugs.launchpad.net/bugs/1751550
Title:
netcat hangs on sending udp packet
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