[heap corruption] unity-panel-service crashed with SIGSEGV in magazine_chain_pop_head() from g_slice_free1()

[Jaydip Guha]

Compiz is very unstable these days in my system thus unity.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: unity-services 6.8.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-17.27-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 304.43 Sun Aug 19 20:14:03 PDT 2012
 GCC version: gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1)
.tmp.unity.support.test.0:

ApportVersion: 2.6.1-0ubuntu1
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,resize,snap,move,mousepoll,gnomecompat,widget,grid,imgpng,vpswitch,regex,place,wall,session,animation,unitymtgrabhandles,fade,expo,workarounds,ezoom,scale,unityshell]
CompositorRunning: compiz
Date: Sun Oct 7 12:46:50 2012
DistUpgraded: 2012-09-04 05:56:52,546 DEBUG enabling apt cron job
DistroCodename: quantal
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 304.43, 3.5.0-17-generic, x86_64: installed
 vboxhost, 4.2.0, 3.5.0-15-generic, x86_64: installed
 vboxhost, 4.2.0, 3.5.0-16-generic, x86_64: installed
 vboxhost, 4.2.0, 3.5.0-17-generic, x86_64: installed
ExecutablePath: /usr/lib/unity/unity-panel-service
GraphicsCard: NVIDIA Corporation GF106 [GeForce GTS 450] [10de:0dc4] (rev a1) (prog-if 00 [VGA controller])
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
JockeyStatus:
 kmod:nvidia_experimental_304 - Experimental NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
 kmod:nvidia_current - nvidia_current (Proprietary, Enabled, Not in use)
 kmod:nvidia_current_updates - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
MachineType: Gigabyte Technology Co., Ltd. GA-MA785GMT-USB3
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-17-generic root=UUID=d5fb4124-9549-4ae0-bce9-49e9debd9838 ro quiet splash
SegvAnalysis:
 Segfault happened at: 0x7f314b1820f6: mov 0x8(%rdx),%rax
 PC (0x7f314b1820f6) ok
 source "0x8(%rdx)" (0x7f213c174668) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_slice_free1 () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_variant_unref () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: unity-panel-service crashed with SIGSEGV in g_slice_free1()
UpgradeStatus: Upgraded to quantal on 2012-09-04 (33 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XorgConf:
 Section "Device"
  Identifier "Default Device"
  Option "NoLogo" "True"
 EndSection
XsessionErrors:
 gnome-session[2196]: WARNING: Failed to start app: Unable to start application: Failed to execute child process "/usr/lib/indicator-ubuntuone/indicator-ubuntuone" (No such file or directory)
 (indicator-multiload:2306): GLib-GIO-CRITICAL **: GApplication subclass 'Main' failed to chain up on ::startup (from start of override function)
 (gnome-settings-daemon:2256): libappindicator-CRITICAL **: app_indicator_set_label: assertion `IS_APP_INDICATOR (self)' failed
 (gtk-window-decorator:2392): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed
dmi.bios.date: 01/04/2010
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F1
dmi.board.name: GA-785GMT-USB3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd01/04/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA785GMT-USB3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-785GMT-USB3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA785GMT-USB3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.8.4-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0~git20121004.b2048c5e-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0~git20121004.b2048c5e-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu5
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu3

[Apport retracing service (apport)]

StacktraceTop:
 magazine_chain_pop_head (magazine_chunks=<synthetic pointer>) at /build/buildd/glib2.0-2.34.0/./glib/gslice.c:537
 magazine_chain_prepare_fields (magazine_chunks=0x7f213c174660) at /build/buildd/glib2.0-2.34.0/./glib/gslice.c:612
 magazine_cache_push_magazine (ix=2, magazine_chunks=<optimized out>, count=34) at /build/buildd/glib2.0-2.34.0/./glib/gslice.c:684
 thread_memory_magazine2_unload (ix=<optimized out>, tmem=<error reading variable: Unhandled dwarf expression opcode 0xfa>) at /build/buildd/glib2.0-2.34.0/./glib/gslice.c:802
 g_slice_free1 (mem_size=<optimized out>, mem_block=0x7f313c038c40) at /build/buildd/glib2.0-2.34.0/./glib/gslice.c:1093

[Bilal Akhtar (bilalakhtar)]

Are these crashes spontaneous, or do they happen when you're doing something particular (for example, opening or closing applications?)

[Will Cooke (willcooke)]

As part of the big bug clear up for 16.04 LTS I am marking this bug as Wont Fix. These types of crasher are better handled by errors.ubutnu.com which can collate similar crash reports to help us identify persitent bugs rather than one-off crashes. Sorry we are not able to help with this specific issue. If you are still experiencing this crash, please re-open the bug and add the tag “desktop-bugscrub-reopen”. See https://wiki.ubuntu.com/BigDesktopBugScrub for more information.