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[Bug 1624599] [NEW] mythbackend crashed with SIGSEGV in QString::append().

To: mythbuntu-bugs@xxxxxxxxxxxxxxxxxxx
From: Jon <1624599@xxxxxxxxxxxxxxxxxx>
Date: Sat, 17 Sep 2016 02:48:17 -0000
Reply-to: Bug 1624599 <1624599@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Crash occurs at least once every couple days. Tuned to single channel on
test box kodi front end accessing mythtvbackend. Same box. additional
logs available if required. Will start tune to single channel now in
attempt to reproduce within couple days time.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: mythtv-backend 2:0.28.0+fixes.20160910.e6a60f7-0ubuntu0mythbuntu2 [origin: LP-PPA-mythbuntu-0.28]
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CrashCounter: 1
CrashDB: mythbuntu
Date: Fri Sep 16 19:00:04 2016
ExecutablePath: /usr/bin/mythbackend
InstallationDate: Installed on 2016-08-12 (35 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Installed_mythtv_dbg: 2:0.28.0+fixes.20160910.e6a60f7-0ubuntu0mythbuntu2
ProcCmdline: /usr/bin/mythbackend --quiet --syslog local7
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/sh
SegvAnalysis:
 Segfault happened at: 0x7f5a5737ee10 <__memcpy_sse2_unaligned+32>:	movdqu (%rsi),%xmm8
 PC (0x7f5a5737ee10) ok
 source "(%rsi)" (0xfeb430137c58) not located in a known VMA region (needed readable region)!
 destination "%xmm8" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: mythtv
StacktraceTop:
 QString::append(QString const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 QtPrivate::QStringList_join(QStringList const*, QChar const*, int) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 QListSpecialMethods<QString>::join (this=0x7f597f7fcbd0, sep=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qstringlist.h:192
 MythSocket::WriteStringListReal (this=0x11794b0, list=0x7f597f7fcbd0, ret=0x7f597f7fc99f) at mythsocket.cpp:758
 MythSocket::qt_static_metacall (_o=0x11794b0, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0x7f597f7fc330) at moc_mythsocket.cpp:148
Title: mythbackend crashed with SIGSEGV in QString::append()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: audio cdrom dialout video

** Affects: mythbuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash need-amd64-retrace third-party-packages xenial

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1624599

Title:
  mythbackend crashed with SIGSEGV in QString::append().

Status in Mythbuntu:
  New

Bug description:
  Crash occurs at least once every couple days. Tuned to single channel
  on test box kodi front end accessing mythtvbackend. Same box.
  additional logs available if required. Will start tune to single
  channel now in attempt to reproduce within couple days time.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: mythtv-backend 2:0.28.0+fixes.20160910.e6a60f7-0ubuntu0mythbuntu2 [origin: LP-PPA-mythbuntu-0.28]
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CrashCounter: 1
  CrashDB: mythbuntu
  Date: Fri Sep 16 19:00:04 2016
  ExecutablePath: /usr/bin/mythbackend
  InstallationDate: Installed on 2016-08-12 (35 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  Installed_mythtv_dbg: 2:0.28.0+fixes.20160910.e6a60f7-0ubuntu0mythbuntu2
  ProcCmdline: /usr/bin/mythbackend --quiet --syslog local7
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/sh
  SegvAnalysis:
   Segfault happened at: 0x7f5a5737ee10 <__memcpy_sse2_unaligned+32>:	movdqu (%rsi),%xmm8
   PC (0x7f5a5737ee10) ok
   source "(%rsi)" (0xfeb430137c58) not located in a known VMA region (needed readable region)!
   destination "%xmm8" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: mythtv
  StacktraceTop:
   QString::append(QString const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
   QtPrivate::QStringList_join(QStringList const*, QChar const*, int) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
   QListSpecialMethods<QString>::join (this=0x7f597f7fcbd0, sep=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qstringlist.h:192
   MythSocket::WriteStringListReal (this=0x11794b0, list=0x7f597f7fcbd0, ret=0x7f597f7fc99f) at mythsocket.cpp:758
   MythSocket::qt_static_metacall (_o=0x11794b0, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0x7f597f7fc330) at moc_mythsocket.cpp:148
  Title: mythbackend crashed with SIGSEGV in QString::append()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: audio cdrom dialout video

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