I tried to isolate what was running concurrently and found 7 gcc calls.
I have set them up to run concurrently in endless loops each.
That way they reached a lot of iterations without triggering the issue :-/

I don't know how to continue :-/
But I can share a login to this system and show how to trigger the bug.

The following will get you there and trigger the bug usually in 1-2 loops (~4h 
on average)
$ ssh [email protected]
$ lxc exec groovy-gccfail bash
# cd qemu-5.0/
# i=1; export DEB_BUILD_OPTIONS=parallel=4; while debuild -i -us -uc -b -d; do 
echo "try $((i++)) complete" >> ~/build.log; done

@Doko could you take over from here as I'd hope you know how to force gcc to 
give you a dump?
I imported your key to the system mentioned above.

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https://bugs.launchpad.net/bugs/1890435

Title:
  gcc-10 breaks on armhf (flaky): internal compiler error: Segmentation
  fault

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