Re: SBCL 2.6.1 SIGILL during make-target-2 warm init on riscv64/linux/musl

After the df927391d53a34c5e67e075d66e4f7b1b465c387 commit, gc stress
ran for about 21 hours before failing:

fatal error encountered in SBCL pid 9582 tid 9584:
no size function for object at 0x50bac0c0 (widetag 0x1)

   0:     0x7fffb344da60 pc=0x4f033450 {0x4f0333a0+00b0} SB-KERNEL::COLLECT-GARBAGE
   1:     0x7fffb344d998 pc=0x4f006a40 {0x7fffb384b7a0+9b7bb2a0} CORRUPTION WARNING in SBCL pid 9582 tid 9584:
Memory fault at 0x800067096f5c (pc=0x555593001030)

Build and gc stress test output:

https://node.pk/tmp/sbcl-2026-02-23/


The Spacemit K3 boards should be out in April or so, roughly Core 2 Duo
single-core performance but with 8 or 16 cores.  Alas, likely $300+ with
shipping...


Faried.