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bug#29256: maxima: The SGC segfault recovery test failed with memprotect


From: Alex Vong
Subject: bug#29256: maxima: The SGC segfault recovery test failed with memprotect_bad_fault_address, SGC disabled
Date: Fri, 17 Nov 2017 01:32:39 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Kei Kebreau <address@hidden> writes:

> Alex Vong <address@hidden> writes:
>
>> Hello all,
>>
>> When I start maxima, I get the following warning message:
>>
>> The SGC segfault recovery test failed with
>> memprotect_bad_fault_address, SGC disabled
>> The SGC segfault recovery test failed with
>> memprotect_bad_fault_address, SGC disabled
>> Maxima 5.41.0 http://maxima.sourceforge.net
>> using Lisp GNU Common Lisp (GCL) GCL 2.6.12
>> Distributed under the GNU Public License. See the file COPYING.
>> Dedicated to the memory of William Schelter.
>> The function bug_report() provides bug reporting information.
>>
>> Actually I encountered this problem quite a while ago after an update,
>> but I didn't report it since it was not fetal.
>
> When did you first notice this issue?
>
I am afraid I cannot remember exactly when...

I installed wxmaxima long ago and things worked fine for a long
time. One day, after updating wxmaxima, it showed the above warning and
started to crash nondeterministically when I typed things into the
message box. The crash was fixed quickly by another update, but the
warning persisted. 

>>
>> Does anyone knows what's going on?
>>
>> Cheers,
>> Alex
>
> Hello Alex,
>
> This is my first time running into this issue. While I do get this
> warning message using the Maxima substitute from hydra.gnu.org, when I
> build Maxima 5.41.0 from source locally, this warning message does not
> appear. Is this the case for you as well?
>
Same for me. I set --prefix during configure and install it
somewhere. It starts without the warning.

> The message comes from the source code of GNU Common Lisp, but the GCL
> binary from hydra.gnu.org doesn't give this error when I run it. It
> seems like this comes down a bug in GCL set off by Maxima, a bug in
> Maxima, a reproducibility issue, or some combination of all of
> these. I'll be investigating this further.
>
> Thank you,
> Kei

Thanks for looking at it!

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