compiz crashed with SIGSEGV in __GI___libc_free()

[Alexander Langanke]

Random crash while using JDownloader.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: compiz-core 1:0.9.12.2+16.04.20160209-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-9.24-generic 4.4.3
Uname: Linux 4.4.0-9-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Fri Mar 4 19:30:31 2016
DistUpgraded: 2015-11-07 14:21:42,567 DEBUG enabling apt cron job
DistroCodename: xenial
DistroVariant: ubuntu
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 NVIDIA Corporation G92 [GeForce 9800 GT] [10de:0614] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. [MSI] G92 [GeForce 9800 GT] [1462:1861]
InstallationDate: Installed on 2015-05-10 (299 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: System manufacturer System Product Name
ProcCmdline: compiz
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-9-generic root=UUID=d54dadf7-9863-4a63-b115-072c5d4a4004 ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7f85412e1932 <__GI___libc_free+34>: mov -0x8(%rdi),%rax
 PC (0x7f85412e1932) ok
 source "-0x8(%rdi)" (0xfffffffffffffff7) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 __GI___libc_free (mem=0xffffffffffffffff) at malloc.c:2933
 XFree () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libcompiz_core.so.ABI-20151010
 PrivateWindow::processMap() () from /usr/lib/x86_64-linux-gnu/libcompiz_core.so.ABI-20151010
 CompScreenImpl::_handleEvent(_XEvent*) () from /usr/lib/x86_64-linux-gnu/libcompiz_core.so.ABI-20151010
Title: compiz crashed with SIGSEGV in __GI___libc_free()
UpgradeStatus: Upgraded to xenial on 2015-11-07 (118 days ago)
UserGroups: adm autopilot cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 12/07/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1207
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P7P55D
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1207:bd12/07/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55D:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.12.2+16.04.20160209-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build1
xserver.bootTime: Fri Mar 4 19:15:10 2016
xserver.configfile: default
xserver.errors:
 systemd-logind: failed to get session: PID 936 does not belong to any known session
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.17.3-2ubuntu4
xserver.video_driver: nouveau

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1551866, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.