[netflow-tools] softflowd keeps crashing

Damien Miller djm at mindrot.org
Thu Apr 9 16:59:09 EST 2009

On Fri, 27 Mar 2009, alex k wrote:

> hi there,
> first of all, softflowd is a cool piece of software.
> we have it on other linux machines (gateways) and it runs perfectly stable
> there.
> i use softflowd to collect data and nfsen to capture and evaluate.
> but there is one host, where softflowd keeps crashing.
> i am a bit clueless as instability doesn't seem to be a problem of softflowd.
> at least i didn't find anything in the web or this list.
> some information about the host:
> kernel (64 bit):
> #1 SMP 2008-12-04 18:10:04 +0100 x86_64 x86_64 x86_64
> GNU/Linux
> libpcap version:
> libpcap0-0.9.8-47.41
> softflowd version:
> softflowd-0.9.8 (compiled without problems on that machine)
> on this host with one network card runs vmware-server with several guests.
> the guests use bridged networking, every has its own ip address, but as
> mentioned - there is only one network card.
> softflowd crashes occasionally. sometimes once in two weeks, sometimes
> twice a day.
> the process disappears, the pid file stays.
> the only thing i recognized is, that at the same time there are often
> flows with completely wrong date (about 6 weeks in the future).
> not exactly the same time, of course. when softflowd crashes, the possibly
> critical data is lost.
> so my questions are:
> 1) where does softflowd get its time from?
> 2) can the wrong time be a problem?
> 3) what else could cause the crashes
> especially: how can i find it out.
> softflowd is _very_ quiet. nothing in the syslog, no message at all.

Try running it manually in debug mode:

nohup flowd -dg &

and see what is in nohup.out if/when it crashes.


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