Sticky immix build fail: Assertion `ma->a->flags.how == 2' failed.

[qinsoon]

In the run https://github.com/mmtk/mmtk-julia/actions/runs/7604776437/job/20708115425 for #112, I got this error during building a release build of sticky immix. It is non-deterministic, and I cannot reproduce the issue again (neither locally or in the CI).

Base  ───────────── 40.367250 seconds
ArgTools  ─────────  6.693130 seconds
Artifacts  ────────  0.253433 seconds
Base64  ───────────  0.112872 seconds
CRC32c  ───────────  0.008417 seconds
FileWatching  ─────  0.174248 seconds
Libdl  ────────────  0.001760 seconds
Logging  ──────────  0.039110 seconds
Mmap  ─────────────  0.089678 seconds
NetworkOptions  ───  0.062446 seconds
SHA  ──────────────  0.199247 seconds
Serialization  ────  0.263934 seconds
Sockets  ──────────  0.391623 seconds
Unicode  ──────────  0.080520 seconds
LinearAlgebra  ────  7.017694 seconds
Markdown  ─────────  0.802332 seconds
Printf  ───────────  0.160136 seconds
Random  ───────────  0.714685 seconds
Tar  ──────────────  0.265033 seconds
Dates  ────────────  1.720099 seconds
Future  ───────────  0.006633 seconds
InteractiveUtils  ─  0.641833 seconds
LibGit2  ──────────  1.499335 seconds
UUIDs  ────────────  0.016796 seconds
REPL  ───────────── 13.033354 seconds
TOML  ─────────────  0.067494 seconds
LibCURL  ──────────  0.349211 seconds
Downloads  ────────  0.384808 seconds
Pkg  ──────────────  4.977926 seconds
Stdlibs total  ──── 40.037469 seconds
Sysimage built. Summary:
Base ────────  40.367250 seconds 50.2035%
Stdlibs ─────  40.037469 seconds 49.7934%
Total ───────  80.407189 seconds
julia: /home/runner/work/mmtk-julia/mmtk-julia/.github/scripts/../../julia/mmtk_julia.c:121: mmtk_sweep_malloced_arrays: Assertion `ma->a->flags.how == 2' failed.

[16917] signal (6.-6): Aborted
in expression starting at none:0
Allocations: 1 (Pool: 1; Big: 0); GC: 0
Aborted (core dumped)
*** This error might be fixed by running `make clean`. If the error persists, try `make cleanall`. ***
make[1]: *** [sysimage.mk:67: /home/runner/work/mmtk-julia/mmtk-julia/vm/julia/usr/lib/julia/sys.ji] Error 1
make: *** [Makefile:97: julia-sysimg-ji] Error 2