Index: cups-2.2.1/scheduler/job.c
===================================================================
--- cups-2.2.1.orig/scheduler/job.c
+++ cups-2.2.1/scheduler/job.c
@@ -1450,6 +1450,19 @@ cupsdFreeAllJobs(void)
        job;
        job = (cupsd_job_t *)cupsArrayNext(Jobs))
     cupsdDeleteJob(job, CUPSD_JOB_DEFAULT);
+  /*
+   * Make sure all the arrays are completely cleared
+   * duplicate jobs can lead to left-over pointers
+   */
+  for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs);
+       job;
+       job = (cupsd_job_t *)cupsArrayNext(ActiveJobs))
+    cupsArrayRemove(ActiveJobs, job);
+
+  for (job = (cupsd_job_t *)cupsArrayFirst(PrintingJobs);
+       job;
+       job = (cupsd_job_t *)cupsArrayNext(PrintingJobs))
+    cupsArrayRemove(PrintingJobs, job);
 
   cupsdReleaseSignals();
 }
@@ -4199,17 +4212,22 @@ load_job_cache(const char *filename)	/*
     }
     else if (!_cups_strcasecmp(line, "</Job>"))
     {
-      cupsArrayAdd(Jobs, job);
 
-      if (job->state_value <= IPP_JOB_STOPPED && cupsdLoadJob(job))
-	cupsArrayAdd(ActiveJobs, job);
-      else if (job->state_value > IPP_JOB_STOPPED)
-      {
-        if (!job->completed_time || !job->creation_time || !job->name || !job->koctets)
-	{
-	  cupsdLoadJob(job);
-	  unload_job(job);
-	}
+      // do not add duplicated jobs from job.cache
+      if (!cupsdFindJob(jobid)) {
+        cupsdLogMessage(CUPSD_LOG_WARN, "Duplicate jobid %d", jobid);
+        cupsArrayAdd(Jobs, job);
+
+        if (job->state_value <= IPP_JOB_STOPPED && cupsdLoadJob(job))
+          cupsArrayAdd(ActiveJobs, job);
+        else if (job->state_value > IPP_JOB_STOPPED)
+        {
+          if (!job->completed_time || !job->creation_time || !job->name || !job->koctets)
+          {
+            cupsdLoadJob(job);
+            unload_job(job);
+          }
+        }
       }
 
       job = NULL;
Index: cups-2.2.1/scheduler/process.c
===================================================================
--- cups-2.2.1.orig/scheduler/process.c
+++ cups-2.2.1/scheduler/process.c
@@ -404,8 +404,10 @@ cupsdEndProcess(int pid,		/* I - Process
 
     pid = -pid;
   }
-
-  if (force)
+  if (abs(pid) == 1){
+    cupsdLogMessage(CUPSD_LOG_ERROR, "Cupsd tried to kill (G)PID %d. Skipped.", pid);
+  }
+  else if (force)
     return (kill(pid, SIGKILL));
   else
     return (kill(pid, SIGTERM));