Public bug reported:

The following commit causes a regression when running this stressor as
root:

commit 088a61a919aa03a33aded7c9725521c504aee28a
Author: Colin Ian King <[email protected]>
Date:   Sat Oct 29 10:12:15 2016 +0100

    stress-iopri: remove local pgrp that shadows global
    
    Signed-off-by: Colin Ian King <[email protected]>

diff --git a/stress-ioprio.c b/stress-ioprio.c
index b53de8f..5973276 100644
--- a/stress-ioprio.c
+++ b/stress-ioprio.c
@@ -52,7 +52,6 @@ int stress_ioprio(
 {
        const pid_t pid = getpid();
        const uid_t uid = getuid();
-       const pid_t pgrp = getpgrp();
        int fd, rc = EXIT_FAILURE;
        char filename[PATH_MAX];

** Affects: stress-ng (Ubuntu)
     Importance: Medium
     Assignee: Colin Ian King (colin-king)
         Status: Fix Committed

** Changed in: stress-ng (Ubuntu)
   Importance: Undecided => Medium

** Changed in: stress-ng (Ubuntu)
       Status: New => In Progress

** Changed in: stress-ng (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

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https://bugs.launchpad.net/bugs/1640631

Title:
  ioprio stressor failes when run as root because of incorrect pgrp id

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