Function walk_kernel_timers 

pub fn walk_kernel_timers<P: PhysicalMemoryProvider>(
    reader: &ObjectReader<P>,
) -> Result<Vec<KernelTimerInfo>>

Walk the kernel timer wheel and return all active timer entries.

Returns Ok(Vec::new()) if timer_bases, _stext, or _etext symbols are absent (graceful degradation for older kernels or incomplete ISF).