On Wed, Dec 14, 2016 at 1:23 AM, Peter Luschny <peter.lusc...@gmail.com> wrote:
> Same problem as last time -- dead kernel: "The kernel has died,
> and the automatic restart has failed." New message:
> "Saving untrusted notebook". Untrusted notebook, what is this?

Hmm, that's too bad.  Though it doesn't look like the *same* problem
either.  Last time there was an illegal instruction exception coming
out of some NTL code.  Now there's a presumably different illegal
instruction in code that hasn't been wrapped in Cysignals.

Sebastien reported what looks to be the same problem:

------------------------------------------------------------------------
Attaching gdb to process id 7632.
Unable to start gdb (not installed?)

GDB is not installed.
Install gdb for enhanced tracebacks.
------------------------------------------------------------------------
Unhandled SIGILL: An illegal instruction occurred.
This probably occurred because a *compiled* module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.
------------------------------------------------------------------------
Illegal instruction (core dumped)



Could you tell me what kind of CPU you have?  And remind me, was this
running in a VM (it shouldn't matter but I'm curious)?

The "untrusted notebook" message is just a normal part of
IPython/Jupyter's security model and is nothing to do with Sage:
http://jupyter-notebook.readthedocs.io/en/latest/security.html#security-in-notebook-documents

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