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Subject: [Bug 200445] login into system on serial line /dev/cuaU0 hangs if
 login shell is /bin/sh
Date: Mon, 25 May 2015 19:08:21 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200445

            Bug ID: 200445
           Summary: login into system on serial line /dev/cuaU0 hangs if
                    login shell is /bin/sh
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: guru@unixarea.de

what is not working:

- if I login as any other unpriv user (and I created a new one for this)
  it hangs after presenting the /etc/motd file; it just hangs

login: valentin
Password: .....

Last login: ....
FreeBSD 11.0-CURRENT (GENERIC) #1 r276659M: Tue Apr 28 15:50:23 CEST 2015

Welcome to FreeBSD!

(hanging)

I figured out what is causing it: the type of the login shell; it works
with /bin/csh, it does not work with /bin/sh.

When it hangs, if you launch a truss on the hanging process /bin/sh
this process resumes normal operation and you can login.

I have two more observations on this:

- when it hangs in the login shell /bin/sh, a Ctrl-C on the terminal
  cancels the hang and a new "login:" appears;

- regardless of the shell, if one starts the MUA 'mutt' (an alpha-mode
  MUA) and below this a 'vim' to write the mail, on return from 'vim' to
  'mutt' (the vim is already terminated as process) the 'mutt' hangs too
  and on Ctrl-C it resumes normal operation;

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