>>>>> "Brian" == Brian May <bam@debian.org> writes: Brian> How do I debug pam_group.so? -- Brian May <bam@debian.org> build pam with debugging symbols. gdb login. Break on the call to pam_authenticate. At that point you should have pam_group loaded and should be able to break within that module. Be sure to disable login's alarm clock to avoid getting blown away by sigalrm.