As reported by Alex, downgrading zeromq to 4.0.5 works for him.
An update to zeromq-4.1.2 resolved the issue for me as well (Arch Linux).
Seems zeromq 4.0.6 has some bugs/issues in combination with IPython?

Regards,
David

On 9 June 2015 at 12:35, Raimar <[email protected]> wrote:

> Hi,
>
>
> today when I restarted spyder I could not launch the ipython console
> anymore:
>
> "It seems the kernel died unexpectedly. Use 'Restart kernel' to continue
> using this console."
>
>
> This is repeated over and over again. I'm on Gentoo Linux, spyder 2.3.4,
> Python 2.7.10 64bits, Qt 4.8.6, PyQt4 (API v2) 4.11.3. These are my
> optional dependencies:
>
> IPython >=1.0   :  3.1.0 (OK)
> jedi >=0.8.1    :  None (NOK)
> matplotlib >=1.0:  1.4.3 (OK)
> pandas >=0.13.1 :  0.16.1 (OK)
> pep8 >=0.6      :  None (NOK)
> psutil >=0.3    :  2.2.1 (OK)
> pyflakes >=0.5.0:  0.8.1 (OK)
> pygments >=1.6  :  2.0.2 (OK)
> pylint >=0.25   :  None (NOK)
> rope >=0.9.2    :  0.10.2 (OK)
> sphinx >=0.6.6  :  1.3.1 (OK)
> sympy >=0.7.3   :  None (NOK)
> zmq >=2.1.11    :  14.6.0 (OK)
>
> There is nothing suspicious shown in the kernel log. The internal console
> only keeps repeating
>
> WARNING:root:kernel died: 3.00297999382
>
>
> Running a standalone "ipython qtconsole" works just fine. What is strange:
> I can even connect to the supposedly died kernel by running ipython
> qtconsole --existing kernel-28216.json in
> ~/.ipython/profile_default/security. When I execute a statement in the
> spyder editor like b=5 by pressing F9, I can access this variable in the
> external ipython console. This lets me believe that the kernel has not
> really died, but spyder just thinks it has. However, the ipython console
> becomes unusable by the repeated error messages.
>
> I tried to delete the ipython configuration file, and also "spyder
> --default" and "spyder --reset", this did not help. Yesterday, a system
> update upgraded the python packages simplejson, cffi, cryptography and
> reinstalled pyzmq because of some internal package changes. I tried to
> downgrade those packages, but it did not solve my problem.
>
>
> How can I obtain more useful debugging output from spyder, to determine
> where the crash actually happens?
>
>
>
> Thanks for your help!
> Raimar
>
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