Veliparib and Radiation Therapy in Treating Patients With Advanced Solid Malignancies With Peritoneal Carcinomatosis, Epithelial Ovarian, Fallopian, or Primary Peritoneal Cancer

Inclusion Criteria: * Dose levels 1-4 must have histologically proven solid malignancy that is metastatic or unresectable with metastatic peritoneal carcinomatosis; as this entity may be difficult to image, peritoneal disease can be documented through other modalities such as operative notes, clinical notes/symptoms, etc as well as imaging * Dose levels 5 and 6 will be open only to patients with recurrent or persistent primary epithelial ovarian, fallopian or peritoneal cancers; at these dose levels, measurable disease in the abdominal cavity must be present but peritoneal carcinomatosis is not required for eligibility * Patients must have failed first line standard therapy or have no acceptable standard treatment options; for patients on dose levels 5 and 6, patients may be platinum sensitive, platinum resistant or platinum refractory * Ability to understand and the willingness to sign a written informed consent document * Eastern Cooperative Oncology Group (ECOG) performance status =\< 1 * Life expectancy of greater than 3 months * Absolute neutrophil count (ANC) \>= 1,500/mcL * Platelets \>= 100,000/mcL * Total bilirubin =\< 1.5 x upper limit of normal (ULN) * Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase \[SGOT\])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase \[SGPT\]) =\< 2.5 x ULN * Creatinine =\< 1.5 x ULN OR creatinine clearance \>= 60 mL/min/1.73 m\^2 for patients with creatinine levels above institutional normal *…