D244 - An illegal instruction has an address, and it is not one the guest asked for

decided · 2026-08-25 · the last unexplained result in a sweep of every import

Planting a sentinel at arg1 of scePthreadMutexattrInit reported Moved - "something downstream moved rather than the address being computed from it". Both sentinels produced the identical fault address, which is the tell: nothing was computed from either value.

The fault was an illegal instruction. Those exceptions carry no address parameters, so the reporter fills the address field with the instruction pointer - a real number that is not somewhere the guest tried to touch. fault - sentinel over it is arithmetic across two unrelated things, and its inconsistency was being read as a weak finding rather than as a category error.

FaultSite::TOUCHED and FaultSite::AT_THE_INSTRUCTION now hold the two lists, published by the crate that defines the field, and orbistoun-worker emits from them rather than writing the strings again. Finding::Derailed reports what actually happened: the plant broke control flow, with how far the guest got attached.

The correction inside the correction is the part worth keeping. The first version also treated reaching fewer imports as disqualifying, imported from the axis sweep where it is exactly right. Run against the live title it reclassified five correct findings. The two sweeps ask opposite questions: poisoning a region and getting less far means the poison broke the run, while planting a sentinel in a pointer and getting less far is what success looks like - the guest now dies at the sentinel instead of surviving to the wall that prompted the experiment. Only touched gates the arithmetic. Pinned by getting_less_far_does_not_disqualify_a_consistent_offset, which was first written asserting the opposite.

Every import of the live title now has a definite classification - 5 dereferenced pointers, 1 derailed run, 17 unmoved, and no Moved at all. The negative conclusion is unchanged and stronger for having nothing ambiguous left in it.