R12 Upgrade patch fails with ORA-04021: timeout occurred while waiting to lock object

R12 Upgrade patch fails with ORA-04021: timeout occurred while waiting to lock object for multiple objects.
adwork001.log:ORA-04021: timeout occurred while waiting to lock object CS.CS_INCIDENTS_ALL
adwork002.log:ORA-04021: timeout occurred while waiting to lock object CN.CN_REV_CLASS_API_ALL
adwork003.log:ORA-04021: timeout occurred while waiting to lock object PJM.PJM_TASK_ATTR_USAGES
adwork004.log:ORA-04021: timeout occurred while waiting to lock object INV.MTL_ITEM_CATALOG_GROUPS_S
adwork005.log:ORA-04021: timeout occurred while waiting to lock object JA.JA_IN_AP_TDS_SERVICES
adwork005.log:ORA-04021: timeout occurred while waiting to lock object JA.JA_IN_REQN_INTERFACE
adwork006.log:ORA-04021: timeout occurred while waiting to lock object JA.JA_IN_57F4_LINES_S
adwork007.log:ORA-04021: timeout occurred while waiting to lock object JA.JAI_ITM_TEMPL_ATTRIBS
adwork008.log:ORA-04021: timeout occurred while waiting to lock object HR.PER_JP_BANK_LOOKUPS
adwork009.log:ORA-04021: timeout occurred while waiting to lock object INV.MTL_ITEM_CATALOG_GROUPS_S
adwork009.log:ORA-04021: timeout occurred while waiting to lock object PJM.PJM_TASK_ATTRIBUTES
adwork010.log:ORA-04021: timeout occurred while waiting to lock object ZX.ZX_ID_TCC_MAPPING
adwork013.log:ORA-04021: timeout occurred while waiting to lock object JA.JA_IN_GEM_TAX_CODES_S1
adwork014.log:ORA-04021: timeout occurred while waiting to lock object CS.CS_INCIDENTS_ALL
adwork017.log:ORA-04021: timeout occurred while waiting to lock object PJM.PJM_TASK_ATTR_USAGES
adwork025.log:ORA-04021: timeout occurred while waiting to lock object JA.JA_IN_AP_FORM16_DTL
adwork027.log:ORA-04021: timeout occurred while waiting to lock object CN.CN_REV_CLASS_API_ALL
adwork028.log:ORA-04021: timeout occurred while waiting to lock object PJM.PJM_TASK_ATTRIBUTES

Solution:
ALTER DATABASE DROP SUPPLEMENTAL LOG DATA;

and restart the failed workers.