Running multiple SSIS packages simultaneously that share the same destination table or the same buffer management space can cause race conditions. Under high concurrency, SSIS’s internal engine might attempt to access a disposed buffer.
If you have tried all the steps above and persists, collect the following for Microsoft: ssis 903
Preparing the 903 return is often the most stressful period for local authority data teams. Running multiple SSIS packages simultaneously that share the
“My nightly ETL failed with SSIS error 903 at 02:00. The log showed nothing else.” ssis 903
The 903 code acts as a system-generated identifier for rows in the ACTIVITY table of the database [24]. Resources & Documentation