Re: Strange ssh hangups, netbsd-9 GENERIC

[RVP <rvp%SDF.ORG@localhost>]

On Fri, 12 Mar 2021, Louis Guillaume wrote:

> OpenSSH_8.0 NetBSD_Secure_Shell-20190418-hpn13v14-lpk, OpenSSL 1.1.1g 21 Apr 
> 2020

Is this the server or the client? Can you post both?

> > ssh -vvv user%ser.ver@localhost 'dd if=/dev/zero bs=1m count=1 2>/dev/null'  >out.bin 
> > 2>ssh.log.txt
>
> Actually out.bin is 0b after running that - but it doesn't surprise me. Would 
> it actually send text to stdout for each \0 returned by dd? Seems like it 
> would basically be an empty string. The stderr is below. Thanks for looking!

You should get a 1MB file if /dev/zero exists, and is readable on
the server (and the dd on the server understands `bs=1m'):

$ ssh -vvv u%s.loc@localhost 'dd if=/dev/zero bs=1048576 count=1 2>/dev/null' >out.bin 2>ssh.log.txt
$ ls -l
total 1036
-rw-------  1 rvp  wheel  1048576 Mar 12 13:15 out.bin
-rw-------  1 rvp  wheel    11282 Mar 12 13:15 ssh.log.txt
$ hexdump -C out.bin
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00100000
$

> OpenSSH_8.1p1, LibreSSL 2.7.3

What OS & client is this? Can you try a different client?

> debug1: Exit status -1

The client is not exiting cleanly. It should--even if there
is a command execution error on the server.


-RVP