stress_build_threads occasionally fails on riscv32

[lawkai-vivo]

[ RUN      ] stress_build_threads
panicked at ../../kernel/kernel/src/arch/riscv/trap.rs:223:9:
assertion failed: ok
Oops: assertion failed: ok

See https://github.com/vivoblueos/kernel/actions/runs/21345463315/job/61432111319

kernel/kernel/src/arch/riscv/trap.rs

Line 223 in 45adebd

debug_assert!(ok);