Turns out that this is reproducible.

make distclean
make
sage -i dot2tex

results in a hang and a non-working sage.

Martin

On Saturday, 11 October 2025 at 23:03:00 UTC+2 Martin R wrote:

> since 10.8.beta6, on ubuntu, I am experiencing strange hangs when trying 
> to recompile sage, for example most recently when doing sage -i dot2tex.
>
> I have no idea how to debug this, here is what make printed last.  top 
> tells me that meson is now using all of the cpu.
>
> After such a failed recompilation, sage does not start anymore.
>
> Martin
>
> make --no-print-directory sagelib-SAGE_VENV-no-deps 
> [sagelib-10.8.beta6] Setting up build directory 
> /home/martin/sage-trac/local/var/lib/sage/venv-python3.12/var/tmp/sage/build/sagelib-10.8.beta6
>  
>
> [sagelib-10.8.beta6] Host system: Linux toolbox 6.8.0-85-generic 
> #85-Ubuntu SMP PREEMPT_DYNAMIC Thu Sep 18 15:26:59 UTC 2025 x86_64 x86_64 
> x86_64 GNU/Linux 
> [sagelib-10.8.beta6] C compiler: gcc, Using built-in specs., 
> COLLECT_GCC=gcc, 
> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/13/lto-wrapper, 
> OFFLOAD_T
> ARGET_NAMES=nvptx-none:amdgcn-amdhsa, OFFLOAD_TARGET_DEFAULT=1, Target: 
> x86_64-linux-gnu, Configured with: ../src/configure -v 
> --with-pkgversion='Ubuntu 13.3
> .0-6ubuntu2~24.04' --with-bugurl=file:///usr/share/doc/gcc-13/README.Bugs 
> --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr 
> --with-gcc-
> major-version-only --program-suffix=-13 --program-prefix=x86_64-linux-gnu- 
> --enable-shared --enable-linker-build-id --libexecdir=/usr/libexec 
> --without-inclu
> ded-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls 
> --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug 
> --enable-libstdcxx-time=ye
> s --with-default-libstdcxx-abi=new --enable-libstdcxx-backtrace 
> --enable-gnu-unique-object --disable-vtable-verify --enable-plugin 
> --enable-default-pie --wit
> h-system-zlib --enable-libphobos-checking=release 
> --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch 
> --disable-werror --enable-cet --wit
> h-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 
> --enable-multilib --with-tune=generic 
> --enable-offload-targets=nvptx-none=/build/gcc-13-fG75R
> i/gcc-13-13.3.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-13-fG75Ri/gcc-13-13.3.0/debian/tmp-gcn/usr
>  
> --enable-offload-defaulted --without-cuda-driver --e
> nable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu 
> --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean 
> --enable-link-serial
> ization=2, Thread model: posix, Supported LTO compression algorithms: zlib 
> zstd, gcc version 13.3.0 (Ubuntu 13.3.0-6ubuntu2~24.04) 
> [sagelib-10.8.beta6] No stamp file for package 'sagelib' in 
> /home/martin/sage-trac/local/var/lib/sage/venv-python3.12/var/lib/sage/installed
>  
>
> [sagelib-10.8.beta6] No spkg-legacy-uninstall script; nothing to do 
> [sagelib-10.8.beta6] [spkg-install] Installing sagelib-10.8.beta6 
> (editable mode) 
> [sagelib-10.8.beta6] [spkg-install] Using pip 24.2 from 
> /home/martin/sage-trac/local/var/lib/sage/venv-python3.12/lib/python3.12/site-packages/pip
>  
> (python 3.
> 12) 
> [sagelib-10.8.beta6] [spkg-install] Obtaining 
> file:///home/martin/sage-trac 
> [sagelib-10.8.beta6] [spkg-install]   Checking if build backend supports 
> build_editable: started 
> [sagelib-10.8.beta6] [spkg-install]   Running command Checking if build 
> backend supports build_editable 
> [sagelib-10.8.beta6] [spkg-install]   Checking if build backend supports 
> build_editable: finished with status 'done' 
> [sagelib-10.8.beta6] [spkg-install]   Preparing editable metadata 
> (pyproject.toml): started 
> [sagelib-10.8.beta6] [spkg-install]   Running command Preparing editable 
> metadata (pyproject.toml) 
> [sagelib-10.8.beta6] [spkg-install]   + meson setup --reconfigure 
> /home/martin/sage-trac /home/martin/sage-trac/build/sage-distro 
> -Dbuildtype=release -Db_nde
> bug=if-release -Db_vscrt=md --default-library=static 
> -DSAGE_LOCAL=/home/martin/sage-trac/local 
> --native-file=/home/martin/sage-trac/build/sage-distro/meson-p
> ython-native-file.ini
>
>
>

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