bin/53589: ftp fails to abort (related to socket error handling changes?)

[martin%NetBSD.org@localhost]

>Number:         53589
>Category:       bin
>Synopsis:       ftp fails to abort (related to socket error handling changes?)
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 11 08:05:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.25
>Organization:
The NetBSD Foundation, Inc.
>Environment:

System: NetBSD night-owl.duskware.de 8.99.25 NetBSD 8.99.25 (NIGHT-OWL) #622: Tue Sep 11 09:37:35 CEST 2018 martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL amd64
Architecture: x86_64
Machine: amd64
>Description:

During sysinst testing I started a ftp download of pkgsrc and interrupted
it with ^C - but this locked up the ftp process:

250-
    Please read the file README
      it was last modified on Tue Nov 18 09:53:20 2008 - 3581 days ago
250 CWD command successful.
250 CWD command successful.
local: pkgsrc.tgz remote: pkgsrc.tgz
229 Entering Extended Passive Mode (|||54936|)
150 Opening BINARY mode data connection for 'pkgsrc.tgz' (60435000 bytes).
  0% |                                   |   340 KiB  169.63 KiB/s    05:45 ETA
receive aborted. Waiting for remote to finish abort.
ftp: Can't send abort message: No buffer space available

The ftp process stuck around like this:

7245 pts/5  Ss+  0:00.29 /usr/bin/ftp -a ftp://ftp.NetBSD.org/pub/pkgsrc/stable/pkgsrc.tgz 

untill I hit another ^C.

>How-To-Repeat:
s/a

>Fix:
n/a