GNU bug report logs - #30993
'ssh-daemon' fails to start

Previous Next

Full log

Message #8 received at 30993 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Leo Famulari <leo <at> famulari.name>
Cc: 30993 <at> debbugs.gnu.org
Subject: Re: bug#30993: OpenSSH sshd killed by Shepherd 0.4.0
Date: Fri, 06 Apr 2018 10:21:09 +0200

Hi Leo,

Leo Famulari <leo <at> famulari.name> skribis:

> Since the update to Shepherd 0.4.0, I've found that OpenSSH's sshd is
> killed almost immediately after it starts with signal 15. I confirmed
> the issue started with the Shepherd upgrade by bisecting our Git
> history.
>
> I can reproduce the issue from commit
> b6beda1d6b9093a8493b5c3cde33ed522242c451 (gnu: Add botan.).
>
> One interesting tidbit is that the PID file '/var/run/sshd.pid' is not
> created anymore. And if I create an empty PID file by hand, it is
> removed after trying to start the ssh-daemon service. Also, the sshd
> user's home '/var/run/sshd' does not exist, and is similarly removed if
> it does exist.

Weird.  On my laptop /var/run/sshd.pid exists and contains the right
PID.  /var/run/sshd does not exist, though.

When I run the config you posted in ‘guix system vm’, ‘ssh-daemon’ is
correctly started and I see a correct ssh.pid and /var/run/sshd exists
as well.

> I ran the OpenSSH system test `make check-system TESTS=openssh` and it
> failed when it could not find the PID file. It passed on another
> non-GuixSD machine. The failing machine is relatively slow and lacks
> KVM: a ThinkPad x200s.

FWIW on my x86_64 laptop, I’ve run it several times in a row (using
“guix build /gnu/store/…-openssh.drv --check”), and it always succeeds.

> I modified the sshd invocation to print some debug output ('-d -E
> /tmp/sshd.log') and this is what it shows:
>
> ------
> debug1: sshd version OpenSSH_7.6, OpenSSL 1.0.2o  27 Mar 2018
> debug1: private host key #0: ssh-rsa SHA256:REDACTED
> debug1: private host key #1: ssh-dss SHA256:REDACTED
> debug1: private host key #2: ecdsa-sha2-nistp256 SHA256:REDACTED
> debug1: private host key #3: ssh-ed25519 SHA256:REDACTED
> debug1: rexec_argv[0]='/gnu/store/az7vib8gk16fybhshh5xpkljmgxyrs4k-openssh-7.6p1/sbin/sshd'
> debug1: rexec_argv[1]='-D'
> debug1: rexec_argv[2]='-d'
> debug1: rexec_argv[3]='-E'
> debug1: rexec_argv[4]='/tmp/sshd.log'
> debug1: rexec_argv[5]='-f'
> debug1: rexec_argv[6]='/gnu/store/miy7xg5j4fg3mn04mcl27awmcl6s97ss-sshd_config'
> debug1: Set /proc/self/oom_score_adj from 0 to -1000
> debug1: Bind to port 22 on 0.0.0.0.
> Server listening on 0.0.0.0 port 22.
> debug1: Bind to port 22 on ::.
> Server listening on :: port 22.
> Received signal 15; terminating.
> ------

Hmm, where could that SIGTERM come from?  ‘make-kill-destructor’ uses it
when a service is stopped, and otherwise it’s sent when we’re shutting
the system down.  But here?…

Thanks,
Ludo’.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.