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Description of problem:
In the patch net-snmp-5.7.2-diskio-whitelist.patch there is a parsing bug in the following line:
if (sscanf (buffer, "%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu\n",
If the /sys/dev/block/%d:%d/stat file has no preceding spaces, due to the number being very high, it will cause the sscanf to fail resulting in all 0's
eg
# cat stat
12379520 0 33751628 215116 1514946 0 20842087 127654 0 165055 342776
The line should likely be the following instead:
if (sscanf (buffer, "%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu%*[ \n\t]%lu\n",
Version-Release number of selected component (if applicable):
net-snmp-5.7.2-37.el7.x86_64
How reproducible:
Any time /sys/dev/block/%d:%d/stat has no preceding spaces.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2020:1081