[Bug 9631] New: top with nice process shows "R N"

bugzilla at busybox.net bugzilla at busybox.net
Wed Feb 1 23:17:35 UTC 2017


https://bugs.busybox.net/show_bug.cgi?id=9631

            Bug ID: 9631
           Summary: top with nice process shows "R N"
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: alt.j2-4o4s2yon at yopmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

a process having nice set is shown in the stat column with the value "R N".
the space in the middle breaks batch mode parsing with awk and other tools
expecting whitespace as field delimiter.

the culprit is in https://git.busybox.net/busybox/tree/libbb/procps.c around
line 475.

                        if (sp->vsz == 0 && sp->state[0] != 'Z')
                                sp->state[1] = 'W';
                        else    
                                sp->state[1] = ' ';
                        if (tasknice < 0)
                                sp->state[2] = '<';
                        else if (tasknice) /* > 0 */
                                sp->state[2] = 'N';
                        else
                                sp->state[2] = ' ';


apparently the code assumes a non-zombie process will never have nice set.

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