[Desktop] ofonod crashed with SIGSEGV in g_str_equal()

[David]

This bug has been reported the last two times I powered up my laptop, even though my laptop doesn't have mobile telephony capabilities.

Since upgrading to 14.10 I have had two "Mobile Broadband" entries under the network indicator.

The only related software I can think of is installing the Unity 8 desktop preview. (Which I did months ago, so it did not trigger this issue.)

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: ofono 1.12.bzr6880+14.10.20141010-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2
Uname: Linux 3.16.0-29-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
Date: Sat Jan 17 12:01:52 2015
ExecutablePath: /usr/sbin/ofonod
ExecutableTimestamp: 1412931933
InstallationDate: Installed on 2014-04-24 (269 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcCmdline: ofonod -P ril
ProcCwd: /
ProcEnviron:
 PATH=(custom, no user)
 TERM=linux
RetraceOutdatedPackages:
 no debug symbol package found for libselinux1
 no debug symbol package found for libdbus-1-3
 no debug symbol package found for libudev1
SegvAnalysis:
 Segfault happened at: 0x7fd30933b156 <__strcmp_ssse3+22>: movlpd (%rdi),%xmm1
 PC (0x7fd30933b156) ok
 source "(%rdi)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%xmm1" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: ofono
StacktraceTop:
 g_str_equal (v1=v1@entry=0x0, v2=<optimized out>) at /build/buildd/glib2.0-2.42.1/./glib/ghash.c:1776
 message_filter (connection=0xfd75b0, message=0xfd7800, user_data=<optimized out>) at gdbus/watch.c:534
 dbus_connection_dispatch () from /tmp/apport_sandbox_QJAfx3/lib/x86_64-linux-gnu/libdbus-1.so.3
 message_dispatch (data=0xfd75b0, data@entry=<error reading variable: value has been optimized out>) at gdbus/mainloop.c:76
 g_timeout_dispatch (source=0xfe0150, callback=<optimized out>, user_data=<optimized out>) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:4520
Title: ofonod crashed with SIGSEGV in g_str_equal()
UpgradeStatus: Upgraded to utopic on 2014-10-25 (86 days ago)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 g_str_equal (v1=v1@entry=0x0, v2=<optimized out>) at /build/buildd/glib2.0-2.42.1/./glib/ghash.c:1776
 message_filter (connection=0xfd75b0, message=0xfd7800, user_data=<optimized out>) at gdbus/watch.c:534
 dbus_connection_dispatch (connection=connection@entry=0xfd75b0) at ../../dbus/dbus-connection.c:4677
 message_dispatch (data=0xfd75b0, data@entry=<error reading variable: value has been optimized out>) at gdbus/mainloop.c:76
 g_timeout_dispatch (source=0xfe0150, callback=<optimized out>, user_data=<optimized out>) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:4520

[Tony Espy (awe)]

So basically what happened is that unity8 depends on ofono, which ending up getting installed on your system when you installed the preview.

As this is unintentional, I've added a unity8 task as we really should only require ofono on touch devices with builtin modems, for the short to medium term, desktop Ubuntu will still rely in modem-mananger for WWAN support.

I've kept the ofono task open, as there's obviously still a bug there, however it's of low importance to us right now.

If you intend to keep the unity8 preview installed on your desktop, you should be able to fix the annoying crashes by dropping an upstart override file into place for ofono.

Simply do the following:

% echo "manual" > ./ofono.override
% cp ./ofono.override > /etc/init
% sudo reboot

[Michał Sawicz (saviq)]

So the dependency chain is unity8 → qtdeclarative5-ubuntu-telephony0.1 → telephathy-ofono → ofono. If we don't want ofono on some installs, we'll need to break the dependency somewhere... I've a feeling it should be between the telephony module and telepathy-ofono, since the functionality feels valid still even without modems (i.e. VoIP). Adding a telephony-service task then.

[Tony Espy (awe)]

Thanks Michael. I'll add this to our network/telephony agenda for this week.

[David (lofidevops)]

The workaround in #6 worked (and I no longer have "Mobile Broadband" entries in my network indicator). Thanks!