This is xnu-8019. See this file in:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>CFBundleIdentifier</key>
        <string>com.apple.jumbo_va_spaces_28530648</string>
        <key>CFBundleName</key>
        <string>XNU test for jumbo va spaces radar://28530648</string>
</dict>
</plist>