[Dnsmasq-discuss] SIGHUP issue

[sven falempin]

On Fri, Feb 15, 2013 at 9:30 AM, Simon Kelley <simon at thekelleys.org.uk>wrote:

> On 13/02/13 22:17, C V wrote:
> >
> >
> >
> >
> >> Sent: Wed, February 13, 2013 12:19:51 PM
> >> Subject: [Dnsmasq-discuss] SIGHUP issue
> >>
> >
> >> The only 1 time I have been able to reproduce  by hand is by trying it
> on a
> >> long-running (many days) process in a cloud  that was not being used
> actively.
> >>
> >
> >
> > OK this part is reproducible and may not be the real problem. In this
> case the
> > logrotate causes dnsmasq to not write to the new dnsmasq.log file. It
> writes to
> > the old file (dnsmasq.log-20130213). The logs indicate that SIGHUP
> indeed is
> > processed.
> >
> > There is a bug in our logrotate config
> > postrotate
> >         [ ! -f /var/run/dnsmasq.pid ] || kill -USR2 `cat
> /var/run/dnsmasq.pid`
> >
> > should be
> > postrotate
> >         [ ! -f /var/run/dnsmasq.pid ] || kill -USR2 `cat
> > /var/run/dnsmasq/dnsmasq.pid`
> >
> >
>
> I'm confused now if there's a real problem or not. Certainly there is no
> problem with SIGHUP that I know of.
>
> A question: do you ever restart dnsmasq? Is there are race between
> restarts and SIGHUP before the pidfile contents are valid?
>
> Cheers,
>
> Simon.
>
>
>
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>



Looks like an OS problem, nevertheless DNSmasq rely on some unitiliazed
value at startup,
i encourage the use of valgrind which i never saw say something wrong and
detect many hard to find bug.

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