bin/53463: ping responds late to SIGINT

[martin%NetBSD.org@localhost]

>Number:         53463
>Category:       bin
>Synopsis:       ping responds late to SIGINT
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 23 07:35:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.22
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD thirdstage.duskware.de 8.99.22 NetBSD 8.99.22 (MODULAR) #100: Mon Jul 16 10:08:57 CEST 2018 martin%thirdstage.duskware.de@localhost:/usr/src/sys/arch/sparc64/compile/MODULAR sparc64
Architecture: sparc64
Machine: sparc64
>Description:

Aborting a ping to a remote host that is down takes several seconds.

>How-To-Repeat:

Run ping against a remote host that is down, wait untill the header line
is printed, then hit ^C.

On NetBSD 8.0 this instantly brings back the shell prompt.
In -curret you will have to wait untill the first ICMP unreachable response
is displayed.

>Fix:
n/a