cgrun068 test nondeterministically crashes

As seen in this build-master job:

Running 1 test suites...
Test suite ghc-tests: RUNNING...
all
  <snip>
  cgrun068:                 ghc-tests: internal error: evacuate: strange closure type 134152192
    (GHC version 9.3.20220304 for x86_64_unknown_linux)
    Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug
Test suite ghc-tests: FAIL

This doesn't happen every time, so there appears to be some nondeterminism involved.