I haven't been able to reproduce this so far using the reduced test-case. So:
1. Please post full transcript of a session where you reproduce this, including the error message, etc, and running sbcl with --no-userinit and --no-sysinit.
2. Also, if you can, please reproduce this using the upstream version of SBCL, instead of the Gentoo version.
(Note that 1.0.28.51 changes the way MAKE-ARRAY is compiled, so the bug may well be masked using your reduced test in post 1.0.28.50 versions.)
I haven't been able to reproduce this so far using the reduced test-case. So:
1. Please post full transcript of a session where you reproduce this, including the error message, etc, and running sbcl with --no-userinit and --no-sysinit.
2. Also, if you can, please reproduce this using the upstream version of SBCL, instead of the Gentoo version.
(Note that 1.0.28.51 changes the way MAKE-ARRAY is compiled, so the bug may well be masked using your reduced test in post 1.0.28.50 versions.)