tracker-extract crashed with SIGSEGV in free()

[william]

# sudo rm -r /var/lib/apt/lists/* -vf
removido '/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_xenial_InRelease'
removido '/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_xenial_partner_binary-amd64_Packages'
removido '/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_xenial_partner_binary-i386_Packages'
removido '/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_xenial_partner_i18n_Translation-en'
removido '/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_xenial_partner_source_Sources'
removido '/var/lib/apt/lists/br.archive.ubuntu.com_ubuntu_dists_xenial-backports_InRelease'
removido '/var/lib/

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: tracker-extract 1.6.1-2ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar 22 19:49:51 2016
ExecutablePath: /usr/lib/tracker/tracker-extract
InstallationDate: Installed on 2016-03-22 (0 days ago)
InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
ProcCmdline: /usr/lib/tracker/tracker-extract
SegvAnalysis:
 Segfault happened at: 0x7f004bf2fbc2 <free+34>: mov -0x8(%rdi),%rax
 PC (0x7f004bf2fbc2) ok
 source "-0x8(%rdi)" (0xac43fffffffa) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: tracker
StacktraceTop:
 free () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0
 g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 gst_discoverer_stream_info_list_free () from /usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/tracker-1.0/extract-modules/libextract-gstreamer.so
Title: tracker-extract crashed with SIGSEGV in free()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 free () from /tmp/apport_sandbox_0jNQPD/lib/x86_64-linux-gnu/libc.so.6
 gst_discoverer_subtitle_info_finalize () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0
 g_object_unref () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 gst_discoverer_stream_info_list_free () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0
 tracker_extract_gstreamer.isra () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/tracker-1.0/extract-modules/libextract-gstreamer.so

[Tyler Hicks (tyhicks)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.