[reSIProcate] Assertion failure in ares_p rocess.c

[Kennard White]

HI Xmly,

I inspected the code and couldn't find an initialization problem; see
rutil/dns/AresDns.cxx around line 274. However, I added an additional assert
into ares_init() that should detected this problem at init time rather than
time of lookup.

The most likely cause is a mismatch between how ares and rutil was built.
Note that rutil will detect if it is built with IPV6 and ares is without,
but the reverse isn't true: if rutil is built without IPV6 and ares with,
then program will attempt to run (see AresDns around line 214).  In this
case you should have receive a Warning log message: "Ignoring non-IPv4
additional name server". Unfortunately, I don't think it is actually
ignored, but rather it passes zero data in that might cause this assertion.

I've had issues under Linux with switching the build options of
contrib/ares; I always run "make clean-ares" at the top to force a rebuild.

Can you checkout the latest SVN (to pick up the new assertion) and build
from scratch? If it still happens, can you provide more information about
your platform, configuration, application and timing?

Scott,
I checked the diff's, and while I collapsed some code, I'm pretty sure no
behavior changes. The ABI dependency of ares on USE_IPV6 is nasty; when I
find time I might try using the union w/padding trick of GenericIPAdress to
to remove this dependency from ares_init().

Regards,
Kennard

2011/2/19 ximalaya <ims3g at 126.com>

> Hi,
>
>  I encountered ares assertion failure today. Details please see below trace
> log.
> The repro server was build with IPv6 enabled and resip-ares using latest
> svn codes.
> INFO | 20110219-182105.421 | repro | REPRO:APP | 0x100b2ef8 |
> ResponseContext.cx
> x:279 | Creating new client transaction c8612e4c96f38c1a ->
> sip:user at xx.org
> assertion "family == AF_INET || family == AF_INET6" failed: file
> "../ares/ares_p
> rocess.c", line 776, function: open_udp_socket
>
> After checking the code, I find the failure is here, can someone check the
> address family field is initialized properly?
> static int open_udp_socket(ares_channel channel, struct server_state
> *server) {
>
> #ifdef USE_IPV6
>   family = server->family;
>   assert(family == AF_INET || family == AF_INET6); //line 776
> #else
>   family = AF_INET;
> #endif
> …
> }
>
> Thanks,
> Xmly
>
>
>
>
>
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>
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