On Fri, Nov 13, 2020 at 11:55 AM 'jonatha...@googlemail.com' via
sage-devel <sage-devel@googlegroups.com> wrote:
>
> Thank you François.
>
> I was doubtful that your answer would help, but it did finally after some 
> googling.
>
> I had to run
>
> import matplotlib.font_manager
> matplotlib.font_manager._rebuild()
>
> At least on the 9.2 install that did help and once my user had those fonts 
> installed in home (believe this is what happened) then it also fixed it on 
> other machines with the same install, but not with the 9.1beta5. Must be a 
> different problem there.
>
> I hope my solution also works for the students (maybe the fix can also be 
> applied in the jupyter notebook from the start, which would be super nice).

Calling this every time Sage starts would be a big slowdown, no?
Perhaps only when ~/.sage/ is created, or something like that.

>
> Jonathan
>
> François Bissey schrieb am Freitag, 13. November 2020 um 10:34:05 UTC+1:
>>
>> The top of your crash log is interesting, especially with the context you 
>> give it.
>>
>> [I 08:54:47.064 NotebookApp] 302 GET 
>> /?token=9646f700a842467835ef92b578ebef632e86a326a85e828b (127.0.0.1) 1.53ms
>> [I 08:54:56.520 NotebookApp] Kernel started: 
>> d273c9d9-80cb-45a6-a336-b3562f294b26, name: sagemath
>> ------------------------------------------------------------------------
>> /srv/public/shared/DGI-sage/local/lib/python3.8/site-packages/cysignals/signals.cpython-38-x86_64-linux-gnu.so(+0x8bb8)[0x7faa181e6bb8]
>> /srv/public/shared/DGI-sage/local/lib/python3.8/site-packages/cysignals/signals.cpython-38-x86_64-linux-gnu.so(+0x8c58)[0x7faa181e6c58]
>> /srv/public/shared/DGI-sage/local/lib/python3.8/site-packages/cysignals/signals.cpython-38-x86_64-linux-gnu.so(+0xc89d)[0x7faa181ea89d]
>> /lib/x86_64-linux-gnu/libpthread.so.0(+0x12730)[0x7faa1cb3b730]
>> /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x10b)[0x7faa1c8107bb]
>> /lib/x86_64-linux-gnu/libc.so.6(abort+0x121)[0x7faa1c7fb535]
>> /lib/x86_64-linux-gnu/libgcc_s.so.1(+0x3358)[0x7faa1a2f8358]
>> /srv/public/shared/DGI-sage/local/lib/python3.8/site-packages/matplotlib/ft2font.cpython-38-x86_64-linux-gnu.so(+0x7a62)[0x7fa87edd6a62]
>> /srv/public/shared/DGI-sage/local/lib/python3.8/site-packages/matplotlib/ft2font.cpython-38-x86_64-linux-gnu.so(_ZN7FT2FontC1ER13FT_Open_Args_l+0x22b)[0x7fa87edda23b]
>> /srv/public/shared/DGI-sage/local/lib/python3.8/site-packages/matplotlib/ft2font.cpython-38-x86_64-linux-gnu.so(+0xd35f)[0x7fa87eddc35f]
>>
>>
>> I’d say it is trying to open a font file to which it has no right.
>>
>> François
>>
>> > On 13/11/2020, at 9:54 PM, 'jonatha...@googlemail.com' via sage-devel 
>> > <sage-...@googlegroups.com> wrote:
>> >
>> > Dear all,
>> >
>> > the jupyter notebook crashes when trying to plot unbounded polyhedra, e.g.:
>> >
>> > P = Polyhedron(ieqs=[(0,1,0)])
>> > P.show()
>> >
>> > Bounded polyhedra seem to work fine, but also plotting of the face 
>> > lattice, a FiniteLatticePoset, fails (even for the cube).
>> >
>> > The crash appears to be deterministic, but only users other than the 
>> > owner. (I changed the permissions to 777 inbetween, this does not seem to 
>> > be the issue.)
>> >
>> > This happens on a 9.2. install, but also on a 9.1beta5 install on a 
>> > different machine (both debian buster).
>> >
>> > It does work for prebuilt binaries (9.2 and 9.1).
>> >
>> > Here are the system packages picked up: (* are those that also are picked 
>> > up for the 9.1beta5 with the same problem).
>> >
>> > boost-1_66_0: using system package; SPKG will not be installed
>> > boost_cropped-1.66.0.p0: using system package; SPKG will not be installed
>> > *bzip2-1.0.6-20150304.p0: using system package; SPKG will not be installed
>> > *cmake-3.18.2: using system package; SPKG will not be installed
>> > *curl-7.62.0.p0: using system package; SPKG will not be installed
>> > *gcc-9.2.0: using system package; SPKG will not be installed
>> > gfan-0.6.2.p1: using system package; SPKG will not be installed
>> > *gfortran-9.2.0: using system package; SPKG will not be installed
>> > *git-2.11.0: using system package; SPKG will not be installed
>> > *gmp-6.1.2: using system package; SPKG will not be installed
>> > *iconv-1.15: using system package; SPKG will not be installed
>> > *mpfr-4.0.1.p0: using system package; SPKG will not be installed
>> > *mpir-3.0.0-644faf502c56f97d9accd301965fc57d6ec70868.p0:using system 
>> > package; SPKG will not be installed
>> > *ncurses-6.0.p0: using system package; SPKG will not be installed
>> > *ninja_build-1.8.2: using system package; SPKG will not be installed
>> > pandoc-none: using system package; SPKG will not be installed
>> > *patch-2.7.5: using system package; SPKG will not be installed
>> > *pcre-8.40.p2: using system package; SPKG will not be installed
>> > *perl_term_readline_gnu-1.35: using system package; SPKG will not be 
>> > installed
>> > *pkgconf-0.9.7.p2: using system package; SPKG will not be installed
>> > *readline-8.0: using system package; SPKG will not be installed
>> > *xz-5.2.2.p0: using system package; SPKG will not be installed
>> > *zlib-1.2.11.p0: using system package; SPKG will not be installed
>> >
>> > Does anyone know what might be the problem?
>> >
>> > In the section for installinging sagemath for multiusers there is no hint
>> > https://doc.sagemath.org/html/en/installation/source.html#id11
>> >
>> > The full config.log and the crash report are attached.
>> >
>> > Thank you,
>> >
>> > Jonathan
>> >
>> >
>> > --
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>> > https://groups.google.com/d/msgid/sage-devel/48a9b546-c516-4969-b5f2-639964b975e4n%40googlegroups.com.
>> > <crash.log><config.log>
>>
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