scdaemon lockup with Yubikey NEO

NIIBE Yutaka gniibe at
Tue Dec 1 05:16:51 CET 2015

On 12/01/2015 08:19 AM, the2nd at wrote:
> So are any devs reading on this list? The problem is reproducible
> and i am willing to help debugging and whatever is needed to fix the
> issue. :)


It is not reproducible for me.  I'm using OpenSSH 6.9p1.

>> i've done some more testing and found out that the problem starts to
>> exist with openssh version 6.8p1. With 6.7p1 everything works perfect.
>> I downloaded the openssh tarballs one by one, compiled with
>> ./configure;make and just copied the "ssh" binary.
>> I was able to reproduce the problem with the following steps:
>> 1. Start gpg-agent: eval $(gpg-agent --daemon --enable-ssh-support
>> --log-file ~/.gnupg/gpg-agent.log)
>> 2. Login to any host with your SSH key and keep the session open: ssh
>> -l root localhost
>> 3. Plug your yubikey out/in
>> 4. Try to login with your SSH key to any other host

Do you have multiple gpg-agent when you encounter failure?  Or
multiple scdaemon?

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