Update: the problem is machine-dependent. On one Dell laptop, plot works with no problem. On a different one, big crash.

Fernando

On 9/22/2021 3:49 PM, William Stein wrote:
---------- Forwarded message ---------
From: Fernando Q. Gouvea <fqgou...@colby.edu>
Date: Wed, Sep 22, 2021 at 12:26 PM
Subject: Re: [sage-support] Sage 9.3 for Windows crashing
To: William Stein <wst...@gmail.com>


At this point, only plotting has caused the problem. For example:

sage: K=Qp(7)
sage: K
7-adic Field with capped relative precision 20
sage: a=K(8)
sage: a
1 + 7 + O(7^20)
sage: sqrt(a)
1 + 4*7 + 2*7^2 + 7^3 + 3*7^4 + 2*7^5 + 4*7^6 + 2*7^7 + 5*7^8 + 7^11 +
4*7^12 + 4*7^13 + 6*7^14 + 2*7^15 + 4*7^16 + 4*7^17 + 5*7^18 + O(7^20)
sage: log(a)
7 + 3*7^2 + 7^3 + 6*7^4 + 5*7^5 + 2*7^6 + 7^7 + 5*7^8 + 4*7^9 + 4*7^10 +
2*7^11 + 5*7^12 + 7^13 + 5*7^14 + 6*7^15 + 2*7^16 + 2*7^17 + 2*7^18 +
7^19 + O(7^20)

That all works fine.

Fernando

On 9/22/2021 2:46 PM, William Stein wrote:
On Wed, Sep 22, 2021 at 11:36 AM Fernando Q. Gouvea <fqgou...@colby.edu> wrote:
I just had SageMath 9.2 crash, so I tried installing 9.3. Alas, I get the same 
problem. The offending command is pretty innocuous:

sage: plot(ln(1+x),(-1,5))

The Sage window then crashes. In the notebook I get a message that the kernel 
just died. Running it in the Sage Terminal, sage crashes and leaves this 
message behind:

------------------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault 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.
------------------------------------------------------------------------
/opt/sagemath-9.3/src/bin/sage-python: line 2:  1535 Segmentation fault      (core 
dumped) sage -python "$@"

Any ideas as to what is going on?
Do lots of things you try cause problems like this or is it just plotting?

E.g., what if you do some basic arithmetic with p-adic numbers, e.g.,
some examples from here:

https://doc.sagemath.org/html/en/reference/padics/sage/rings/padics/tutorial.html

(Sorry, I can't help asking that given that I learned all about
p-adics from your book decades ago...)

Fernando


--
==================================================================
Fernando Q. Gouvea
Carter Professor of Mathematics
Colby College
Mayflower Hill 5836
Waterville, ME 04901
fqgou...@colby.edu   http://www.colby.edu/~fqgouvea

Humility engenders learning because it beats back the arrogance
that puts blinders on. It leaves you open for truths to reveal
themselves. You don't stand in your own way.
    -- Wynton Marsalis

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--
==================================================================
Fernando Q. Gouvea
Carter Professor of Mathematics
Colby College
Mayflower Hill 5836
Waterville, ME 04901
fqgou...@colby.edu         http://www.colby.edu/~fqgouvea

What garlic is to food, insanity is to art.



--
=============================================================
Fernando Q. Gouvea         http://www.colby.edu/~fqgouvea
Carter Professor of Mathematics
Dept. of Mathematics and Statistics
Colby College
5836 Mayflower Hill
Waterville, ME 04901

We receive the deepest truths only when we're patient enough
-- and stable enough and docile enough -- to allow ourselves
to be taught them.
  -- R. R. Reno, in "Piety's Rightful Claim"

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