Date: Thu, 13 Jun 2024 14:38:46 -0600 From: freebsd-net@brettglass.com To: net@freebsd.org Subject: Overflow or div by 0 in systat -ifstat? Message-ID: <202406132038.OAA03662@mail.lariat.net>
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Hello! Left systat -ifstat running to watch the bandwidth on a few
Netgraph VPN tunnels overnight, and woke up to this today:
/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
Load Average |
Interface Traffic Peak Total
ng4 in 0.000 Mb/s 0.001 Mb/s 1.976 MB
out 0.000 Mb/s 0.000 Mb/s 5.049 MB
ng3 in 0.000 Mb/s 29132214617622.535 M 46.615 MB
out 0.000 Mb/s 29132214589474.320 M 1.143 GB
ng2 in 0.000 Mb/s 0.384 Mb/s 322.777 MB
out 0.000 Mb/s 8.150 Mb/s 9.344 GB
ng1 in 0.000 Mb/s 0.000 Mb/s 2.688 MB
out 0.000 Mb/s 0.000 Mb/s 12.815 MB
ng0 in 0.000 Mb/s 1.467 Mb/s 853.927 MB
out 0.000 Mb/s 2.548 Mb/s 3.896 GB
Looks like an overflow, a math error (perhaps at the stroke of
midnight?), or an uncaught divide-by-zero. Since the peak rate
calculation is done in userland, this isn't a critical bug; it
won't cause a kernel panic. But it may be a good idea to see what
might have caused it.
--Brett Glass
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