https://bugzilla.mindrot.org/show_bug.cgi?id=2437
Bug ID: 2437
Summary: ssh with ControlMaster and ControlPath hangs on 2nd
session in same terminal
Product: Portable OpenSSH
Version: 6.7p1
Hardware: amd64
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: ssh
Assignee: [email protected]
Reporter: [email protected]
with two terminals a hang can be reproduces as follows:
- In terminal 1 do:
ssh -o "ControlMaster auto" -o "ControlPath
~/.ssh/sshctrl-%l-%h-%p-%r" localhost
- In terminal 2 do the same:
ssh -o "ControlMaster auto" -o "ControlPath
~/.ssh/sshctrl-%l-%h-%p-%r" localhost
- Then back in terminal 1 again:
logout
This doesn't terminate the ssh-command to keep the control socket
open. Then pressing Ctrl-Z and run bg to send the ssh into the
background.
- The "remote" shell in the 2nd terminal is still working.
- Now repeat the ssh command in the first terminal:
ssh -o "ControlMaster auto" -o "ControlPath
~/.ssh/sshctrl-%l-%h-%p-%r" localhost
Both sessions don't react any more. The only way I found to resolve up
to now is to kill all related ssh sessions with kill(1).
Note that just exiting the first shell after sending the ssh process
that created the control socket in the background works fine. Also
adding new sessions in a third terminal works then.
Note this is already reported to the Debian bug tracker under
https://bugs.debian.org/794063 and I was asked to forward it here.
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