Thanks James for research and reporting! On Tue, Sep 16, 2014 at 4:53 AM, James Cameron <qu...@laptop.org> wrote:
> Summary: partially solved with new kernel. > > The Chat activity was run with debug logging in Terminal: > > % SUGAR_LOGGER_LEVEL=debug sugar-launch org.laptop.Chat > > At the time the activity was shared, the log showed: > > 1410842095.436535 DEBUG sugar3.presence.activity: <_ShareCommand object at > 0x527dc8 (sugar3+presence+activity+_ShareCommand at 0x4f7c20)>: Join > finished DBusException(dbus.String(u'Failed to connect to multicast > group'),) > > Telepathy Salut was failing to setup the multicast group, because it > was calling setsockopt with SO_REUSEPORT, because Fedora 20 header > files define SO_REUSEPORT, but the OLPC kernel did not. > > (It is bad that the failure was not reported to the user or to the > logs unless debug logging was turned on. If someone cares, they can > raise a bug.) > > Adding SO_REUSEPORT support to the kernel [2] solved for Salut over > networks where DHCP is available; such as wired or wireless access > points. The new kernel is in the dropbox [3]. The previous change to > avahi-daemon configuration is removed [4]. > > A different problem occurs with Salut over link local addresses; IBSS > ad-hoc wireless. The buddy icons are missing. > > # avahi-browse -t _presence._tcp # shows no output > > References: > > 1. > > http://code.metager.de/source/xref/freedesktop/telepathy/salut/lib/gibber/gibber-multicast-transport.c > > 2. > http://dev.laptop.org/git/olpc-kernel/log/?h=arm-3.5 > > 3. > http://rpmdropbox.laptop.org/f20-xo4/ > kernel-3.5.7_xo4-20140916.0607.olpc.5196e01.armv7hl.rpm > > 4. > > http://dev.laptop.org/git/projects/olpc-os-builder/commit/?id=f34ddb8b83ca6b9cb657e115df117ffa3704eea5 > > > On Thu, Sep 11, 2014 at 06:24:20PM +1000, James Cameron wrote: > > G'day, > > > > Activities shared by Fedora 20 systems do not appear in Network > > Neighbourhood on Fedora 18 or Fedora 20 systems. Buddies appear. > > Activities shared by Fedora 18 Sugar 0.98 systems appear. > > > > So this is a failure to announce sharing of activities on Sugar 0.102 > > on Fedora 20. > > > > tcpdump shows mDNS packets for every operation except when an activity > > is shared on Fedora 20. > > > > avahi-browse output is consistent with Network Neighbourhood. > > > > avahi-browse -t _presence._tcp # for buddies > > avahi-browse -t _clique._udp # for activities > > > > (avahi-daemon needed tweaking to compensate for lack of SO_REUSEPORT > > support in 3.5 kernel; change /etc/avahi/avahi-daemon.conf to set > > disallow-other-stacks=yes) > > > > I have tried http://wiki.sugarlabs.org/go/BugSquad/Telepathy_Debugging > > but there is no interesting output corresponding to the event. > > > > I have used strace and seen possible D-Bus activity relating to the > > event. sendmsg(11, {msg_name(0)=NULL, > msg_iov(2)=[{"l\1\0\1<\0\0\0/\0\0\0\252\0\0\0\1\1o\0?\0\0\0/org/fre"..., > 192}, {"+\0\0\0org.freedesktop.Telepathy.Ch"..., 60}], msg_controllen=0, > msg_flags=0}, MSG_NOSIGNAL) = 252 > > > > I welcome any suggestions for further diagnosing this problem. > > > > -- > > James Cameron > > http://quozl.linux.org.au/ > > -- > James Cameron > http://quozl.linux.org.au/ > _______________________________________________ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel > -- Gonzalo Odiard SugarLabs - Software for children learning
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