[Bug 259174] openssh-portable 8.8 sftp issue (fatal: unable to make the process untraceable)

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 14 Oct 2021 22:51:29 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259174

            Bug ID: 259174
           Summary: openssh-portable 8.8 sftp issue (fatal: unable to make
                    the process untraceable)
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: mike@sentex.net
                CC: bdrewery@FreeBSD.org

Using a sshd_config from portable 8.7, my RELENG_12 and RELENG_13 sftp servers
are no longer working as the connection errors out with
internal-sftp[85599]: fatal: unable to make the process untraceable

The same setup works fine with 8.7. 


With an almost default config

% diff sshd_config sshd_config.sample 
30c30
< LogLevel VERBOSE
---
> #LogLevel INFO
105c105
< #VersionAddendum FreeBSD-openssh-portable-8.7.p1,1
---
> #VersionAddendum FreeBSD-openssh-portable-8.8.p1,1

a simple sftp localhost errors out with 

sftp-server[89445]: fatal: unable to make the process untraceable

after authentication is done

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