gnome-panel crashed with SIGSEGV after a new application had opened

[Matthias Andree]

I had just started a new application, which had just opened its Window, then gnome-panel crashed. Not sure if it's related to the window list applet, which is enabled in the panel.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: gnome-panel 1:3.18.3-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.8.0-34.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-34-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Sun Feb 19 12:27:33 2017
ExecutablePath: /usr/bin/gnome-panel
ExecutableTimestamp: 1471862524
GsettingsChanges:
 b'org.gnome.gnome-panel.layout' b'object-id-list' b"['menu-bar-0', 'show-desktop-0', 'workspace-switcher-0', 'object-0-1', 'object-0-0', 'object-0-4', 'object-0-5', 'object-0-3', 'object-0-7', 'object-0-2', 'launcher', 'launcher-0', 'launcher-1', 'launcher-2', 'launcher-3', 'launcher-4', 'launcher-5', 'window-list-applet']"
 b'org.gnome.gnome-panel.layout' b'toplevel-id-list' b"['top-panel-0', 'bottom-panel-0']"
 b'org.gnome.gnome-panel.run-dialog' b'history' b"['VirtualBox', 'diodon', 'killall -9 diodon', 'diodon', 'killall diodon', 'darktable', 'diodon ', 'VirtualBox', 'killall clementine', 'picard', 'VBoxHeadless -s FreeBSD', 'diodon', 'VirtualBox', 'rawtherapee', 'skype', 'simple-scan', 'VirtualBox', 'nvidia-settings', 'pinta', 'metacity --replace']"
ProcCmdline: gnome-panel
ProcCwd: /home/mandree
RetraceOutdatedPackages:
 no debug symbol package found for liblzma5
 no debug symbol package found for libjbig0
SegvAnalysis:
 Segfault happened at: 0x7f37fe6a13b5 <malloc_consolidate+149>: cmp 0x18(%r13),%r12
 PC (0x7f37fe6a13b5) ok
 source "0x18(%r13)" (0x00000018) not located in a known VMA region (needed readable region)!
 destination "%r12" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-panel
StacktraceTop:
 malloc_consolidate (av=av@entry=0x7f37fe9e6b20 <main_arena>) at malloc.c:4181
 _int_malloc (av=av@entry=0x7f37fe9e6b20 <main_arena>, bytes=bytes@entry=4096) at malloc.c:3448
 __GI___libc_malloc (bytes=bytes@entry=4096) at malloc.c:2911
 g_malloc (n_bytes=n_bytes@entry=4096) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmem.c:94
 menu_realpath (name=name@entry=0x44b9e50 "/home/mandree/.config/menus/gnome-applications.menu", resolved=0x0) at /build/gnome-menus-HjGI5V/gnome-menus-3.13.3/./libmenu/canonicalize.c:78
Title: gnome-panel crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin audio cdrom dialout dip disk fax floppy fuse kvm libvirtd lpadmin netdev plugdev pulse sambashare saned tape vboxusers video

[Apport retracing service (apport)]

StacktraceTop:
 malloc_consolidate (av=av@entry=0x7f37fe9e6b20 <main_arena>) at malloc.c:4181
 _int_malloc (av=av@entry=0x7f37fe9e6b20 <main_arena>, bytes=bytes@entry=4096) at malloc.c:3448
 __GI___libc_malloc (bytes=4096) at malloc.c:2911
 g_malloc () from /tmp/apport_sandbox_T_V4KC/lib/x86_64-linux-gnu/libglib-2.0.so.0
 menu_realpath.constprop () from /tmp/apport_sandbox_T_V4KC/usr/lib/x86_64-linux-gnu/libgnome-menu-3.so.0

[Alberts Muktupāvels (muktupavels)]

It seems that crash is in gnome-menus library not in panel...

[Matthias Andree (matthias-andree)]

The library was loaded on the gnome-panel process's behalf, so might as
well be the way that gnome-panel is using it.

[Alberts Muktupāvels (muktupavels)]

gnome-panel only calls gmenu_tree_load_sync when it get changed signal. Everything else in stacktrace after that call is in gnome-menus library.