strace — Binary Crash Forensics

Find why a compiled binary exits immediately with no error output using strace.

A advanced Linux challenge worth 20 points. Solve it hands-on in a real Linux environment in your browser - no local setup, no fake shells.

The Challenge

A binary at /opt/app/service exits with code 1 immediately on startup. No error message. strace is your only tool.

Your tasks:

• Trace file-related syscalls: strace -e trace=openat,stat,connect /opt/app/service 2>&1 | head -30
• Identify the first syscall that returns ENOENT or EACCES
• Determine what the binary is looking for (config file, socket, directory)
• Create the missing resource or fix the permission
• Verify the binary starts successfully
• Write to /tmp/strace_findings.txt: missing resource path, error type, and fix applied
• Run check to validate