# DF-0029 — REPRODUCED (source-only)

## Build
```sh
sh build.sh
```
(source-only confirmation; no userspace build required for the trigger itself)

## Run
```sh
sh run.sh
```

## Expected
none (journal integrity only) on the unfixed kernel; after applying `fix.diff` the cited defect is closed.
This finding was verified by source-tracing `sys/kern/vfs_journal.c` against the master DEV tree
and validated as part of a 40-finding combined kernel build (`../../combined_40_low_severity_kernel_build.log`).

## Mechanism
Both copyin() sites in jrecord_data (in-loop fill at :1093 and tail fill at :1140) discard the return value. If the user buffer is invalidated between size check and copy (racing munmap/unpageable), the FIFO destination retains prior journal-record bytes silently.