We are getting test timeouts on armhf since sagemath 9.0-1. The exact spots where it happens have changed over time, one that stayed the whole time is in src/sage/modular/modform/constructor.py. From there one can see that one can trigger the issue for example with

sage -c "print(ModularForms(Gamma1(4),11).basis())"

I tried to debug this on an armhf porterbox, but didn't manage to get a meaningful backtrace. The backtraces from the build logs also don't tell me much. Here is an example:

Stack backtrace
---------------
No symbol table info available.
#1  0xf76fc274 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
No symbol table info available.
#2  0xf6bac1a6 in ?? ()
   from /usr/lib/python3/dist-packages/cysignals/signals.cpython-39-arm-linux-gnueabihf.so
No symbol table info available.
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Increasing SAGE_TIMEOUT also didn't help.

Any help is appreciated.

Best,
Tobias