uploads seems working.

UploadsOnDisk.go

 	}
 	defer os.RemoveAll(dir)
 
+	libreOfficeMutex.Lock() //ensure only one libreoffice is running
+
 	// Create a new context and add a timeout to it
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel() // The cancel should be deferred so resources are cleaned up
 
 	// Create the command with our context
 	cmd := exec.CommandContext(ctx, "libreoffice", "--convert-to", format, "--outdir", dir, m.filePath())
 
-	libreOfficeMutex.Lock() //ensure only one libreoffice is running
 	// This time we can simply use Output() to get the result.
 	out, e := cmd.Output()
 	libreOfficeMutex.Unlock()
 
 // first page to thumbnail
 // all page to single jpg
+var convertPDFMutex sync.Mutex // make sure we only have one convert running at a time
 func (m *uploadsOnDisk) convertPDFToJpg() (e error) {
 
 	if fileExists(m.jpgPath()) {
 	}
 	defer os.RemoveAll(dir)
 
+	convertPDFMutex.Lock()
 	// convert -density 3000  abc.pdf  path/tmp/result.png
 	// could be path/tmp/result-0, result-1, result-2, ... png
 	target := dir + string(os.PathSeparator) + "result.jpg" //.jpg suffix is important
 	strCmd := cmd.String()
 	log.Debug("command is ", strCmd)
 	out, e := cmd.Output()
+	convertPDFMutex.Unlock()
+
 	if e != nil {
 		log.Error("cannot create png file for PDF", m.Upload, e)
 		_, e = copyFile(config.UploadsDir.JpgDefault, m.jpgPath())

apiV1UploadAnalysis.go

 	log "github.com/sirupsen/logrus"
 	"net/http"
 	"strconv"
+	"sync"
 	"time"
 )
 
+var analysisMutex sync.Mutex // make sure only one analysis run at a time.
 func apiV1UploadAnalysis(w http.ResponseWriter, r *http.Request, ss *loan.Session) {
 	strId := r.URL.Path[len(apiV1Prefix+"upload-analysis/"):] //remove prefix
 	Id, e := strconv.Atoi(strId)
 		return
 	}
 
+	analysisMutex.Lock()
 	ai := AiDecodeIncome{}
 	e = ai.decodeUploadToPayIn(ul)
+	analysisMutex.Unlock()
 	if e != nil {
 		log.Error("Invalid uploads Id cannot conver to integer", Id, e)
 		apiV1Server500Error(w, r)

pay-in-decode.go

 	cmd := exec.Command("pdftotext", "-layout", m.ul.filePath(), "-")
 	out, e := cmd.Output()
 	if e != nil {
-		log.Fatal(e)
+		log.Error("cannot convert pdf to text ", e)
 	}
 
 	raw := string(out)