# DF-2390 VERDICT

**Status:** not_reproduced
**Impact:** none
**Confidence:** certain
**Attempts:** 2

Unreachable through firmware on this ACPICA (20251212): a _CRS containing two dependent-function groups is rejected by ACPICAs own resource walk with AE_AML_INVALID_RESOURCE_TYPE before any DragonFly callback runs (acpi_resource.c:429 prints can't fetch resources, the pci_link attach fails with ENXIO, the machine boots normally). The two-walk disagreement in DragonFly code is real (acpi_count_irq_resources tolerates a second START_DEPENDENT via DPF_IGNORE at acpi_pci_link.c:180-186 while link_add_crs panics at :222-226) but can only be reached if ACPICA ever hands such a buffer over. Retained as defense-in-depth; fix.diff makes link_add_crs tolerate like the counter walk (compile-validated).

## Kernel references
- `sys/dev/acpica/acpi_pci_link.c:180`
- `sys/dev/acpica/acpi_pci_link.c:222`
- `sys/dev/acpica/acpi_pci_link.c:496`
- `sys/dev/acpica/acpi_resource.c:429`

## Guest
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #7: Sat Oct 24 00:08:04 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/ACHARNESS  x86_64

## Fix validation
See fix.diff and README.md for the baseline/fixed A/B outputs (run.log / fixed.log).

## Fix status (batch validation)
Applied with the 36 sibling fix.diffs of this batch in findings/poc/_batch41/all_fixes.patch; single in-guest `make -j6 nativekernel KERNCONF=X86_64_GENERIC` completed RC=0 with zero errors under -Werror (full log: findings/poc/_batch41/fix_build8.log). Behavior A/B intentionally skipped for this Info-tier item.