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Update: The "freeze" I explain in this bug is not an emulator freeze
(which I thought at first), but a goldfish kernel panic.

--------------------------------

This might be a bug in one of the products the ubuntu emulator is based
on, or maybe it's a configuration issue. I don't know so I report this
here.

I'm trying to use libupnp in the Ubuntu emulator (My app was compiled
using a 15.04 framework / i386 "kit" chroot created through ubuntu-sdk
on Ubuntu 14.04, the emulator runs the "devel" i386 system image, I
think r1, and libupnp is statically linked against my c++ backend
module).

My system is 14.04 and I use the SDK PPA, so…
ubuntu-emulator is version 0.10-0ubuntu1
ubuntu-emulator-runtime is version 20140922-1903-0ubuntu3

There is a problem because InitUpnp() freezes the emulator instead of
initializing the library correctly.

By single-stepping through that library function and the functions called by that function, I figured out that it probably freezes in a setsockopt() call: (*)
> ret = setsockopt(*ssdpSock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
>			 (char *)&ssdpMcastAddr, sizeof(struct ip_mreq));

Line 846:
> http://sourceforge.net/p/pupnp/code/ci/master/tree/upnp/src/ssdp/ssdp_server.c#l846

* (That guess is based on the fact that after entering
create_ssdp_sock_v4(), there's a sequence of socket(), setsockopt(),
bind(), inet_addr(), inet_addr(), setsockopt() and then it freezes when
typing "fin" in gdb to return from the last setsockopt call – I don't
have enough debug information in the binary to know exactly, and I'm
looking at libupnp git master but linking against a precompiled
libupnp.a supplied by Ubuntu.)

That system call apparently changes the socket to receive multicast
packets.

Related: http://sourceforge.net/p/pupnp/mailman/message/18352779/ states
that the same line of code caused issues for another qemu-based
emulator, but that was in 2008 and AIUI qemu is supposed to support
IP_ADD_MEMBERSHIP since 2009.

** Affects: linux-goldfish (Ubuntu)
     Importance: Undecided
         Status: New

-- 
goldfish kernel panic after setsockopt(…IP_ADD_MEMBERSHIP…)
https://bugs.launchpad.net/bugs/1420366
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