This can be trivially reproduced by installing the wily-proposed network-manager on i386 and rebooting. This is also spotted by systemd's autopkgtest (http://autopkgtest.ubuntu.com/packages/s/systemd/wily/i386/).
In the journal I see
Sep 04 08:32:15 autopkgtest NetworkManager[718]: (NetworkManager:718): GLib-GObject-WARNING **: /build/glib2.0-M4BESt/glib2.0-2.45.6/./gobject/gsignal.c:2506: signal 'ModemAdded' is invalid for instance '0x997d760' of type 'GDBusProxy'
Sep 04 08:32:15 autopkgtest NetworkManager[718]: (NetworkManager:718): GLib-GObject-WARNING **: /build/glib2.0-M4BESt/glib2.0-2.45.6/./gobject/gsignal.c:2506: signal 'ModemRemoved' is invalid for instance '0x997d760' of type 'GDBusProxy'
Sep 04 08:32:15 autopkgtest NetworkManager[718]: (NetworkManager:718): GLib-CRITICAL **: g_variant_get_va: assertion 'value != NULL' failed
Sep 04 08:32:15 autopkgtest systemd[1]: NetworkManager.service: Main process exited, code=dumped, status=11/SEGV
I suppose the g_critical is not the thing it fails on, as that would be a SIGABRT.
ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: network-manager 1.0.4-0ubuntu2
ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
Uname: Linux 4.2.0-7-generic i686
ApportVersion: 2.18-0ubuntu9
Architecture: i386
Date: Fri Sep 4 08:40:19 2015
ExecutablePath: /usr/sbin/NetworkManager
ExecutableTimestamp: 1440792479
IpRoute:
default via 10.0.2.2 dev eth0
10.0.2.0/24 dev eth0 proto kernel scope link src 10.0.2.15
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
ProcCmdline: /usr/sbin/NetworkManager --no-daemon
ProcCwd: /
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SegvAnalysis:
Segfault happened at: 0xb701f259 <g_variant_iter_loop+25>: mov 0xc(%esi),%edi
PC (0xb701f259) ok
source "0xc(%esi)" (0x0000000c) not located in a known VMA region (needed readable region)!
destination "%edi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: network-manager
StacktraceTop:
g_variant_iter_loop () from /lib/i386-linux-gnu/libglib-2.0.so.0
?? () from /usr/lib/i386-linux-gnu/NetworkManager/libnm-wwan.so
?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
Title: NetworkManager crashed with SIGSEGV in g_variant_iter_loop()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
nmcli-con: Error: command ['nmcli', '-f', 'all', 'con'] failed with exit code 8: Error: NetworkManager is not running.
nmcli-dev: Error: command ['nmcli', '-f', 'all', 'dev'] failed with exit code 8: Error: NetworkManager is not running.
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.
Importance medium as this only affects wily-proposed, and failing tests kept this from promoting. But I added block-proposed anyway as you were disabling most NM autopkgtests.