[Bug 2420] Race condition regarding ControlPersist and ControlMaster=auto

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2420

--- Comment #2 from Dominik Klein <dominik.klein at gmail.com> ---
This was found in an ansible environment. This is the debug log I got:

<snippedhostname> ConnectTimeout=10 PasswordAuthentication=no
KbdInteractiveAuthentication=no
ControlPath=/home/klein/.ansible/cp/ansible-ssh-%h-%p-%r
PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey
ControlMaster=auto ControlPersist=5s
fatal: [snippedhostname] => SSH encountered an unknown error. The
output was:
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /home/klein/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: auto-mux: Trying existing master
debug1: Control socket
"/home/klein/.ansible/cp/ansible-ssh-snippedhostname-22-klein" does not
exist
debug2: ssh_connect: needpriv 0
debug1: Connecting to snippedhostname [217.116.120.20] port 22.
debug2: fd 3 setting O_NONBLOCK
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug3: timeout: 9997 ms remain after connect
debug1: identity file /home/klein/.ssh/id_rsa type -1
debug1: identity file /home/klein/.ssh/id_rsa-cert type -1
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/klein/.ssh/id_dsa" as a RSA1 public key
debug1: identity file /home/klein/.ssh/id_dsa type 2
debug1: identity file /home/klein/.ssh/id_dsa-cert type -1
debug1: identity file /home/klein/.ssh/id_ecdsa type -1
debug1: identity file /home/klein/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/klein/.ssh/id_ed25519 type -1
debug1: identity file /home/klein/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
ssh_exchange_identification: Connection closed by remote host

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