Bug Diagnosis Prompt

Help diagnose this bug.
Symptom: {{symptom}}
Error/logs:
{{logs}}
Relevant code:
```
{{code}}
```
Environment: {{environment}}

Requirements:
1. List the three most likely root causes, ranked.
2. For each, give a verification method using commands, logs or breakpoints; do not jump to conclusions.
3. Provide minimal reproduction steps.
4. Provide a fix and regression test.
5. If information is missing, list exactly what to collect.