[reSIProcate] Problem with DNS and mActiveQueryCount

[Byron Campen]

	What revision are you using? It may be that this bug is fixed on  
head (major work has been done on the DNS code since last October).

Best regards,
Byron Campen

> Hi!
>
> I have been running resiprocate for several months and it has been
> really stable. But this morning I suddenly had problem 4 times, with
> exactly 1 hour between the problems. (TTL of DNS-records is 3600, I
> don't know if this is related in some way) .  The following line:
> assert(mInterface.mActiveQueryCount >= 0) was triggered in
> DnsResult.cxx:79.
>
> Of cource I receive no core if I disable the asserts, but then the
> mActiveQueryCount come in a strange state. What about changing the
> code, so an if-clause check if it's below zero and set it to zero?  I
> have looked at the code but I can't see why this is happening. I need
> help with some ideas.
>
> Best regards,
>
> Fredrik
>
>
> bt from core is:
>
> #2  0x4037f2df in __assert_fail () from /lib/tls/libc.so.6
> #3  0x400dfb88 in resip::DnsResult::transition (this=0x44012070,
> t=29463) at DnsResult.cxx:79
> #4  0x400e6fca in resip::DnsResult::processHost (this=0x44012070,
> status=0, result=0x440037b8) at DnsResult.cxx:810
> #5  0x400ddb93 in resip::DnsInterface::handle_host (this=0x44bccc08,
> res=
>        {<resip::ExternalDnsResult> = {<resip::AsyncResult> =
> {mErrorCode = 0}, userData = 0x44012070}, host = 0x440037b8}) at
> AsyncID.hxx:36
> #6  0x400bc4d5 in resip::AresDns::aresHostCallback (arg=0x440076c8,
> status=0, result=0x6) at ExternalDns.hxx:76
> #7  0x401e98a6 in end_hquery (hquery=0x44009fc8, status=0,
> host=0x440037b8) at ares_gethostbyname.c:161
> #8  0x401e982c in host_callback (arg=0x44009fc8, status=0, abuf=0x0,
> alen=0) at ares_gethostbyname.c:153
> #9  0x401ec27a in end_squery (squery=0x44016ba0, status=0, abuf=0x0,
> alen=0) at ares_search.c:174
> #10 0x401ec16d in search_callback (arg=0x44016ba0, status=6,
> abuf=0x0, alen=0) at ares_search.c:137
> #11 0x401ebf17 in qcallback (arg=0x440005e8, status=0,
> abuf=0x453ee470 "", alen=124) at ares_query.c:115
> #12 0x401ebced in end_query (channel=0xfdf56e0, query=0x440166d8,
> status=0, abuf=0x0, alen=0) at ares_process.c:768
> #13 0x401eb49c in read_udp_packets (channel=0xfdf56e0,
> read_fds=0x453f08f0, now=1174960961) at ares_process.c:306
> #14 0x401eb079 in ares_process (channel=0xfdf56e0,
> read_fds=0x453f08f0, write_fds=0x0) at ares_process.c:67
> #15 0x400bc6f0 in resip::AresDns::process (this=0x0, read=@0x0,
> write=@0x0) at AresDns.cxx:151
> #16 0x400dd95b in resip::DnsInterface::process (this=0x7317,
> fdset=@0x6) at DnsInterface.cxx:147
> #17 0x40197ab8 in resip::TransportSelector::process (this=0x44bccc04,
> fdset=@0x453f08f0) at TransportSelector.cxx:177
> #18 0x40179fde in resip::TransactionController::process
> (this=0x44bccb74, fdset=@0x0) at TransactionController.cxx:80
> #19 0x4016741e in resip::SipStack::process (this=0x44ba9008,
> fdset=@0x0) at SipStack.cxx:421
> #20 0x0818b99b in lSipStack::threadProcess (this=0x107ec890) at
> sipstack.cxx:289
>
>
>
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