track down memory leak/infinite memory usage

solfuzz-firedancer-only, weekend run(rss limit was 16gb):
```
#15175723    NEW  cov: 14850 ft: 45494 corp: 3786/723Mb lim: 1000000 exec/s: 90 rss: 9451Mb
```
solfuzz-agave-only, weekend run (rss limit was 16gb):
```
#8656213    NEW  cov: 39129 ft: 104749 corp: 5141/1097Mb lim: 1000000 exec/s: 42 rss: 16378Mb
```