Bug 2178863

Description of problem:
mpstat on intermittently shows incorrect CPU usage on ALL CPU field for "iowait"

Version-Release number of selected component (if applicable):
All versions affected, affected customer here used sysstat-11.7.3-5.el8

How reproducible:
not easily

Steps to Reproduce:
1. On a bugger system, i.e. 32 cores, execute mpstat, for example "mpstat  -P ALL 1 1" or "mpstat  -P ALL 1 3600"

Actual results: 
Total CPU usage (%iowait) is 97.10%.
01:17:04 AM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
01:17:05 AM  all    0.00    0.00    0.01   _97.10_    0.00    0.00    0.00    0.00    0.00    2.88
01:17:05 AM   17    0.00    0.00    0.00   _99.91_    0.00    0.00    0.00    0.00    0.00    0.09

Expected results: 
Total CPU usage (%iowait) should be a value which is divided by 32, because the system has 32 CPUs.
01:17:04 AM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
01:17:05 AM  all    0.00    0.00    0.01  _3.12_    0.00    0.00    0.00    0.00    0.00    2.88
01:17:05 AM   17    0.00    0.00    0.00  _99.91_   0.00    0.00    0.00    0.00    0.00    0.09

Additional info:
- Issue exists also in upstream
- a build of mpstat with the following commit was reported to fix
  the issue for the customer:
  https://github.com/sysstat/sysstat/commit/1f5949d4a6fcb33065dbb1d509f356db039998ed

So, requesting this commit into RHEL.
Workaround exists, Performance Co-Pilot (PCP) provides independent code which
gathers metrics and provides with "pcp mpstat" an independent client of similar
output, which does not show the issue.