How to determine which modules are responsible for spectre_v2 returning "Vulnerable: Retpoline with unsafe module(s)"?

Issue

• When we run the "Spectre And Meltdown Detector" lab app, it reports Vulnerable: Retpoline with unsafe module(s) similar to the output below. How do we find out which modules are unsafe?

Variant #2 (Spectre): Vulnerable: Retpoline with unsafe module(s)
CVE-2017-5715 - speculative execution branch target injection
   - Kernel with mitigation patches: OK
   - HW support / updated microcode: YES
   - IBRS: Not disabled on kernel commandline
   - IBPB: Not disabled on kernel commandline
   - Retpolines: Not disabled on kernel commandline

• When checking for Spectre vulnerabilities, the /sys/devices/system/cpu/vulnerabilities/spectre_v2 file indicates the following. How do we find out which modules are responsible?

# cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
Vulnerable: Retpoline with unsafe module(s)