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2026-08-18 09:20:44 +02:00
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+# Test Case: 48-bit Fallback Root Union
+
+**Test ID**: TC150-48bit-fallback-root
+
+## Objective
+
+Rerun the Linux-compatible `48BIT=1 && rootnid_8b=0` fallback on the current
+exact KLD: the two-byte union remains `rootnid_2b`, not `blocks_hi`.
+
+## Fixture
+
+Use `images/fallback-48bit-root2.erofs` and `source/compact/root.txt`.
+Structured evidence asserts incompat `0x80`, `rootnid_8b=0`, nonzero
+`rootnid_2b`, provider-sized `blocks_lo`, and valid CRC. fsck.erofs 1.8.6 does
+not recognize this newer incompat bit.
+
+## Procedure
+
+Host:
+
+```sh
+python3 tests/erofs_fixture.py inspect /work/build/repo22-g1/images/fallback-48bit-root2.erofs --path=/root.txt
+od -An -tu2 -j 1038 -N 2 /work/build/repo22-g1/images/fallback-48bit-root2.erofs
+od -An -tx4 -j 1104 -N 4 /work/build/repo22-g1/images/fallback-48bit-root2.erofs
+od -An -tu8 -j 1136 -N 8 /work/build/repo22-g1/images/fallback-48bit-root2.erofs
+```
+
+Guest after mount:
+
+```sh
+stat -f 'root_ino=%i type=%HT' "$mnt"
+cmp /tmp/repo22-g1/source/compact/root.txt "$mnt/root.txt"
+sha256 /tmp/repo22-g1/source/compact/root.txt "$mnt/root.txt"
+./statfs_probe "$mnt"
+df -kT "$mnt"
+```
+
+## Expected Results
+
+- Root inode equals `rootnid_2b`; source data matches.
+- `statfs` block count equals `blocks_lo` only, with no multi-terabyte size
+  error. Current exact KLD mount and cleanup pass.
+- Historical TC150 evidence cannot substitute for this rerun.