Bug 167706

Summary: Overflow in /proc/diskstats on 64-bit systems
Product: Red Hat Enterprise Linux 4 Reporter: Bastien Nocera <bnocera>
Component: kernelAssignee: Peter Staubach <staubach>
Status: CLOSED WONTFIX QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: jbaron, rkenna, sct
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Hardware: All   
OS: Linux   
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Last Closed: 2006-02-13 16:37:53 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 170416    
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genhd.diff none

Description Bastien Nocera 2005-09-07 14:12:06 UTC 
On 64-bit machines, some values exported by /proc/diskstats, and then used by
iostat, can overflow.

For example:
Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s    wkB/s avgrq-sz
avgqu-sz   await  svctm  %util
sda          5.50   0.00 143.96  0.00 307496983987862656.00    0.00
153748491993931328.00     0.00 2136028725038430.00     7.94   55.12   5.59  80.42

The patch attached seems to fix those problems, but might cause problems with
the soft kABI. Patch is from Ben Woodward <woodward>
Comment 1 Bastien Nocera 2005-09-07 14:12:07 UTC 
Created attachment 118561 [details]
genhd.diff
Comment 2 Bastien Nocera 2005-09-07 14:14:46 UTC 
That's Ben Woodard <woodard>. Sorry Ben ;)