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tests/TC007-concurrent-mount.md

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+# Test Case: Concurrent Mount Operations
+
+**Test ID**: TC007-concurrent-mount
+
+## Objective
+
+Verify two simultaneous mounts of the same deterministic EROFS image through
+independent md providers, including source-exact reads from both mounts.
+
+## Fixture
+
+Use `images/compact.erofs` and `source/compact/testfile.txt` from the G1
+fixture set. Follow `tests/G1-MANUAL-SETUP.md`.
+
+## Procedure
+
+```sh
+image=/tmp/repo22-g1/images/compact.erofs
+source=/tmp/repo22-g1/source/compact/testfile.txt
+mnt1=/mnt/repo22-g1-007a
+mnt2=/mnt/repo22-g1-007b
+md1=$(mdconfig -a -t vnode -f "$image")
+md2=$(mdconfig -a -t vnode -f "$image")
+mkdir -p "$mnt1" "$mnt2"
+set +e
+mount -t erofs -o ro "/dev/$md1" "$mnt1" & p1=$!
+mount -t erofs -o ro "/dev/$md2" "$mnt2" & p2=$!
+wait "$p1"; rc1=$?
+wait "$p2"; rc2=$?
+set -e
+printf 'mount_rc=%d,%d providers=%s,%s\n' "$rc1" "$rc2" "$md1" "$md2"
+test "$rc1" -eq 0 -a "$rc2" -eq 0
+cmp "$source" "$mnt1/testfile.txt"
+cmp "$source" "$mnt2/testfile.txt"
+cmp "$mnt1/testfile.txt" "$mnt2/testfile.txt"
+sha256 "$source" "$mnt1/testfile.txt" "$mnt2/testfile.txt"
+umount "$mnt1"
+umount "$mnt2"
+mdconfig -d -u "${md1#md}"
+mdconfig -d -u "${md2#md}"
+rmdir "$mnt1" "$mnt2"
+```
+
+## Expected Results
+
+- Both independently waited mount processes return zero.
+- All three comparisons and SHA256 values match.
+- No panic, trap, EROFS diagnostic, mount, or md provider remains.