Crash when exporting FFT wisdom for certain c2c transform sizes

I am seeing a crash in the fftw_export_wisdom_to_filename function for certain 2d complex-to-complex transforms with FFTW_PATIENT. I've tried a range of sizes and it's rare but it appears to occur with certain larger prime sizes.

For example, 263x263 crashes, as does 269x269 and 263x269. Other nearby primes don't, though. I have not seen it for a non-prime size, but I haven't tried very hard to find failure cases.

I'm on libarmpl_lp64, version 24.04, and I've seen the same behavior on both macos and linux. I can make minimal changes to the example code in fftw_guru_dft_c2c_c_example.c to reproduce the crash:

52,53c52,53
< 	const int n0 = 3;
< 	const int n1 = 4;
---
> 	const int n0 = 263;
> 	const int n1 = 269;
101,102c101,102
< 	fftw_plan forward  = fftw_plan_guru_dft(RANK, dims, HM_RANK, hm_dims, x, y, FFTW_FORWARD, FFTW_ESTIMATE);
< 	fftw_plan backward = fftw_plan_guru_dft(RANK, dims, HM_RANK, hm_dims, y, x, FFTW_BACKWARD, FFTW_ESTIMATE);
---
> 	fftw_plan forward  = fftw_plan_guru_dft(RANK, dims, HM_RANK, hm_dims, x, y, FFTW_FORWARD, FFTW_PATIENT);
> 	fftw_plan backward = fftw_plan_guru_dft(RANK, dims, HM_RANK, hm_dims, y, x, FFTW_BACKWARD, FFTW_PATIENT);
127a128,131
>   if (!fftw_export_wisdom_to_filename("test.fftwisdom")) {
>     fprintf(stderr, "export error\n");
>   }
>

The crash occurs with FFTW_PATIENT or FFTW_MEASURE but not FFTW_ESTIMATE.

I am observing no real loss in performance when changing to FFTW_ESTIMATE, so this is an acceptable workaround for me. That leads me to a related question: should I expect any advantage to the MEASURE or PATIENT planner modes in armpl?