Re: [chrony-users] bug report: duplicate server addresses cause chronyd to core

[Miroslav Lichvar <mlichvar@xxxxxxxxxx>]

On Wed, Apr 24, 2013 at 11:40:12PM -0400, victor lum wrote:
> Hello, I don't know if this bug has already been filed, or if this is
> improper place to report it.  If this is improper I apologize for the
> extra spam.

This is a good place to report bugs.

> I believe I have found a bug in chrony 1.27 which causes chronyd to
> crash.  Using the attached config file, chrony.conf, and the command
> line "chronyd -n -f chrony.conf", I get the output in syslog.txt
> (attached) and then a segfault.
> 
> After sorting through the code, I was able to identify what I feel to be
> the issue - duplicate IP addresses in the list of ntp servers.  The
> backtrace in gdb.txt shows that the fault occurs in acquire.c.  It shows
> that a timer from timer_queue executed transmit_timeout with a pointer
> to a SourceRecord which has been deleted.
> 
> I believe it became invalid by this mechanism in acquire.c:

Thanks for the detailed report and the patch. I will push it to git
and it will be in the next release.

-- 
Miroslav Lichvar

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