netfilter buglog - Nov 2003 - [Bug 104] Bytes/packets counters sometimes give incorrect values

https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=104





------- Additional Comments From netfilter-bugzilla@ratty.org.uk  2003-11-22
16:15 -------
I'm seeing the same problem here.

We're grabbing byte counts from around 2000 rules with iptables -nvxL from a
minutely cron job and occasionally the counts come back as zero or a few
packets worth of bytes and then return to their previous values the next
minute. Based on the timing, it's quite likely that this is happening at
times when another iptables or iptables-restore (--noflush) process is
running.

The system is a RH7.3 box (iptables-1.2.8-8.72.3) with a custom compiled
2.4.20 kernel.

It's pretty unpredictable, but I might be able to get an strace of the
process if that would help.



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https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=104





------- Additional Comments From netfilter-bugzilla@ratty.org.uk  2003-12-07
14:07 -------
Adding our own locking to prevent the scripts running iptables/iptables-restore
simultaneously seems to have stopped this, so it looks like this was the trigger
for the bug.

It does mean I don't have an strace, though.



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