Segmentation fault when running h264ref_sss with RVV agnostic policy enabled

[shinezyy]

Workload: OpenSBI + Linux 6.6.30 + h264ref_sss
ISA extentsion: RV64GCBHV, with RVV agnostic policy enabled
Compiler version: GCC 15

After simulating 3 Billion instructions, h264ref_sss encountered segmentation fault.
However, I difftest NEMU against Spike with RVV agnostic policy off, which has simulated 5.1 Billion instruction with no error.

So, I think the segmentation fault is related to agnostic policy.

Workaround: When taking checkpoint with NEMU, always turn off agnostic policy.

Question: Does Spike implement agnostic? If not, it might be hard to debug after simulating 3 Billion instructions.