SUMMARY: Help! Machine stops every 2 hours with 'out of mbufs' message

From: Matthew Donaldson (
Date: Thu Dec 02 1993 - 10:26:43 CST

My original question was:

> Hi all. We've been having a really strange problem plaguing some of our
> suns lately. A machine will display on the console a log message something
> like:
> Nov 26 14:34:56 heruka vmunix: mbuf map full
> and stop talking to the network. It displays the login prompt on the console
> but when you enter username and password it just hangs, and has to be rebooted.
> It happens at random intervals. The latest machine is doing about every 1.5
> to 2 hours, which is causing a certain amount of havoc.

I finally found out that the problem was being caused by Dialup PPP v.2.3
which we were running on our system. It seems to eat away at mbufs, but only
occasionally under some circumstances which we haven't been able to determine.
After shutting it down and starting it up a day later the problem hasn't
recurred. When the next release that runs on SunOS 4.1.3 comes out we'll
switch to that and see if the bug is fixed.

Thanks to the following people for their suggestions:
stern@sunrise.East.Sun.COM (Hal Stern - NE Area Systems Engineer) (Joel Shandelman)
A1C White <> (Wolfgang Kuehnel ) (Doug Jones)
Torsten Metzner <>


| Matthew Donaldson Email: |
| Computer Science Department Phone: +61 8 303 5583 _ |
| University of Adelaide Fax: +61 8 303 4366 John / \/ |
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