[Bug 2577] New: Port Forwarding on Proxy with ProxyCommand ssh -W does not work / bad file descriptor

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2577

            Bug ID: 2577
           Summary: Port Forwarding on Proxy with ProxyCommand ssh -W does
                    not work / bad file descriptor
           Product: Portable OpenSSH
           Version: 7.2p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jan.stuehler at web.de

Port Forwarding on the proxy does not work. Debug shows "debug1:
getpeername failed: Bad file descriptor". OpenSSH_7.2p2, OpenSSL
1.0.2h-fips  3 May 2016.
Related to bug 2200 ("ssh -W causes "getsockname failed: Bad file
descriptor" errors")? 

Reproduction:

~/.ssh/config:
Host jump
 HostName my.dynamicdns.com
 Port 2222
 User user
 IdentityFile ~/.ssh/user-jump_ed25519
 DynamicForward 1080
Host */remote
 ProxyCommand ssh -vvv -W $(dirname %h) jump 2>~/sshpc.log
Host target
 HostName target
 Port 22
 User user
 IdentityFile ~/.ssh/user-target_ed25519

ssh target/remote
(check ss -lant4 in second terminal: no listener on port 1080)
(exit ssh session)

cat sshpc.log
[...]
Authenticated to my.dynamicdns.com ([12.34.56.78]:2222).
debug3: ssh_init_stdio_forwarding: router:22
debug1: channel_connect_stdio_fwd router:22
debug1: channel 0: new [stdio-forward]
debug2: fd 4 setting O_NONBLOCK
debug2: fd 5 setting O_NONBLOCK
debug1: getpeername failed: Bad file descriptor
debug3: send packet: type 90
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x10
debug1: Requesting no-more-sessions at openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
[...]

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