Local ubsan builds succeed normally.

But when ICECC=icecc is added to the scons line, the ubsan.denylist doesn't make its way into the build host and the remote compile fails.

My local icecc is 1.4, but I think the problem is the peer hosts according to my reading of SERVER-59243.

Definitely looks a lot like SERVER-59243.
Maybe upgrading all the icecream versions in the cluster didn't fully fix the issue?

My scons build looks like this:

    python3 ./buildscripts/scons.py \
        --variables-files=etc/scons/mongodbtoolchain_stable_clang.vars \
        --variables-files=etc/scons/developer_versions.vars \
        --dbg=on \
        --opt=on \
        --sanitize=undefined \
        --ninja=enabled \
        build.ninja

Adding ICECC=icecc to this causes a failure.