https://bugzilla.mindrot.org/show_bug.cgi?id=2964
Bug ID: 2964
Summary: OpenSSH for Windows often hangs if no data sent over
the connection
Product: Portable OpenSSH
Version: 7.9p1
Hardware: Other
OS: Windows 10
Status: NEW
Severity: normal
Priority: P5
Component: ssh
Assignee: [email protected]
Reporter: [email protected]
This was reproduced on both 7.7p1 and 7.9p1, while ssh-ing from a
Windows machine to a Linux machine. For a simple repro I'm using the
bash commands `echo ""` (should output a single newline) and `echo -n
""` (should output nothing and immediately exit successfully; I've also
used /bin/true which is equivalent.)
> ssh user@host -- echo ""
Reliably returns right away as expected.
> ssh user@host -tt -- echo ""
Reliably returns right away as expected.
> ssh user@host -- echo -n ""
Seems to hang, but if you press a key it returns.
> ssh user@host -tt -- echo -n ""
Sometimes it works, sometimes it hangs. When it hangs it will be
unresponsive to input, including ^C. You need to kill it in task
manager. A wireshark trace shows that the server sent the TCP FIN
packet, but the client is still holding open the connection.
> ssh user@host -tt -v -- echo -n ""
Turning on verbose output seems to make it work reliably.
Not sure to what extent network latency affects this but my ping time
is 11ms.
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