Intermittent problem with a custom concurrent program - Signal 6 ( stat_low = 86 )

Hello, we have an active issue with a custom concurrent program and it's runtime. Program finishes with status ERROR on intermittent basis in PRODUCTION and QA environment. Our lower non-prod environments do not have this issue. It's an RDF with XML transformation into PDF and our developer has not found any problems with code. We have tried multiple things, but running out of ideas. Bellow is the error from request log:

stat_low = 86

stat_high = 0

emsg:was terminated by signal 6

Java HotSpot(TM) Server VM warning: You have loaded library /anglboq2/erpapp/10.1.2/lib/librwu.so which might have disabled stack guard. The VM will try to fix the stack guard now. It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'. Enter Password:  # # A fatal error has been detected by the Java Runtime Environment: # #  SIGSEGV (0xb) at pc=0xf6139f91, pid=6768, tid=0xd96f4b70 # # JRE version: Java(TM) SE Runtime Environment (7.0_241-b09) (build 1.7.0_241-b09) # Java VM: Java HotSpot(TM) Server VM (24.241-b09 mixed mode linux-x86 ) # Problematic frame: # C  [librw.so+0x342f91]  rwhtxca_ConAllString+0x217 # # Core