openssh bugs - Jan 2022 - [Bug 3383] New: ssh can not exit when a command is running in backgroup

https://bugzilla.mindrot.org/show_bug.cgi?id=3383

            Bug ID: 3383
           Summary: ssh can not exit when a command is running in
                    backgroup
           Product: Portable OpenSSH
           Version: 8.8p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: xylene2016 at gmail.com

Openssh version: 8.8p1-git2e5cfed513e84444483baf1d8b31c40072b05103

ssh -vv ip

#situation 1:
# hanging
[root at localhost ~]# sleep 30 >/dev/null 2>&1 & exit
[1] 15494
logout
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow at openssh.com reply
0
debug2: channel 0: rcvd eow
debug2: chan_shutdown_read: channel 0: (i0 o0 sock -1 wfd 4 efd 6
[write])
debug2: channel 0: input open -> closed

#situation 2:
# hanging
[root at localhost ~]# sleep 30 >/dev/null 2>&1 &
[1] 15556
[root at localhost ~]# exit 
logout
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow at openssh.com reply
0
debug2: channel 0: rcvd eow
debug2: chan_shutdown_read: channel 0: (i0 o0 sock -1 wfd 4 efd 6
[write])
debug2: channel 0: input open -> closed

#situation 3:
# This is a normal exit
[root at localhost ~]# exit 
logout
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: obuf empty
debug2: chan_shutdown_write: channel 0: (i0 o1 sock -1 wfd 5 efd 6
[write])
debug2: channel 0: output drain -> closed
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow at openssh.com reply
0
debug2: channel 0: rcvd eow
debug2: chan_shutdown_read: channel 0: (i0 o3 sock -1 wfd 4 efd 6
[write])
debug2: channel 0: input open -> closed
debug2: channel 0: rcvd close
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
Connection to 45.77.159.33 closed.
Transferred: sent 2992, received 4408 bytes, in 6.0 seconds
Bytes per second: sent 500.1, received 736.8
debug1: Exit status 0

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https://bugzilla.mindrot.org/show_bug.cgi?id=3383

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
But it does exit after 30 seconds, right?

If so, then this is completely intentional. Use nohup if you want to
disown background processes.

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--- Comment #2 from John <xylene2016 at gmail.com> ---
commit  5c79952dfe1aa36105c93b3f383ce9be04dee384
upstream: prepare for conversion of ssh, sshd mainloop from
>From this commit, ssh will be hanging.
But before this commit, ssh will exit immediately.

This conversion is not completed, not ready for use yet?

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
             Blocks|                            |3353

--- Comment #3 from Damien Miller <djm at mindrot.org> ---
Thanks for finding the commit that caused this - it was a great help.
That commit accidentally disabled a hack for Linux to handle this
condition on sessions with ttys. I just pushed a fix in e204b343


Referenced Bugs:

https://bugzilla.mindrot.org/show_bug.cgi?id=3353
[Bug 3353] Tracking bug for openssh-8.9
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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #4 from Damien Miller <djm at mindrot.org> ---
closing bugs resolved before openssh-8.9

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