Receiving Bus error in the middle of a render

[jldonovan3]

I'm utilizing c4.2xlarge instances to render an animation, and at a random point early on in the render, the render stops. This is what the log gives:
./brenda-go: line 2: 2099 Bus error (core dumped) /usr/local/blender-2.79-a6f750dd414-linux-glibc219-x86_64/blender -b *.blend -F EXR -o /mnt/brenda/brenda-outdir1.tmp/frame_###### -s 240 -e 240 -j 1 -t 0 -a RMTREE /mnt/brenda/brenda-outdir1.tmp ******* RETRY 1/5: fatal error in active task

The process is never able to recover after the five retries. I checked and the memory being used by the scene is well within the 15GB of memory on the c4.2xlarge instances. I also tried the render with a c5.4xlarge instance (32GB memory) and received the same error.

The instances are running a custom AMI with Blender 2.79 and the latest version of Ubuntu. Other scenes and files have rendered fine on these instances. I even tried rendering a test frame from the file throwing errors, and it renders fine on my desktop system.

Anyone know what this could mean?