I am not sure whether the OP's circumstances are the similar, but this GH issue report may help out:

https://github.com/signalwire/freeswitch/issues/74

On Thu, 24 Oct 2019 at 15:13, Mike Jerris <mike@freeswitch.org> wrote:
We’d need a bug reported to GitHub with a backtrace from the crash to look at this properly.

On Oct 24, 2019, at 8:57 AM, Callum Guy <callum.guy@x-on.co.uk> wrote:

Easily reproducible issue, simply try and record to a file with the .raw extension. This causes FreeSWITCH to immediately crash:

uuid_record 01386fbc-b552-487e-a5af-4bd1661a97f0 start /tmp/file.raw

Using: FreeSWITCH Version 1.10.1-release-12-f9990221e6~64bit (-release-12-f9990221e6 64bit)
OS: Debian 10 Buster (4.19.0-6-amd64)

Apologies, no experience capturing a core dump and have failed to do so from the notes on https://freeswitch.org/confluence/display/FREESWITCH/Debugging, wanted to report the issue.

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