If there is a crash on linux, where will the core file be (or will there be one)?

Having a problem where the 2.5.27 server on Ubuntu 20.04.5 LTS is crashing (looks like its related to the backup disk getting full). I’m seeing
segfault at 8 ip 0000555c892e1000 sp 00007fe0cb7fd2d0 error 6 in urbackupsrv[555c88d14000+716000]

in the kernel log. I wanted to gather data before submitting a ticket but I can’t find a core file to check for a traceback. Is there an option I can use to cause a segfault to generate a core file or at least a traceback? Thanks!