Mythbuntu

mythpreviewgen crashed with SIGSEGV in QMutex::lock()

Bug #1456438 reported by Glenn Brumfield on 2015-05-19

This bug affects 4 people

Affects		Status	Importance	Assigned to	Milestone
	Mythbuntu	New	Undecided	Unassigned

Bug Description

After watching a Recording, I exited during the movie credits by pressing the 'Esc' button without pausing the Recording. While looking through other Recordings, crash occurred.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: mythtv-backend 2:0.27.4+fixes.20150514.6b73976-0ubuntu0mythbuntu4 [origin: LP-PPA-mythbuntu-0.27]
ProcVersionSignature: Ubuntu 3.16.0-37.51~14.04.1-generic 3.16.7-ckt9
Uname: Linux 3.16.0-37-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
CrashCounter: 1
CrashDB: mythbuntu
Date: Mon May 18 22:03:02 2015
ExecutablePath: /usr/bin/mythpreviewgen
InstallationDate: Installed on 2015-03-10 (70 days ago)
InstallationMedia: Mythbuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
Installed_mythtv_dbg: 2:0.27.4+fixes.20150514.6b73976-0ubuntu0mythbuntu4
ProcCmdline: mythpreviewgen --size 0x0 --chanid 1082 --starttime 20150517203000 --verbose general --loglevel info --quiet --syslog local7
ProcEnviron:
TERM=linux
PATH=(custom, no user)
LANG=en_US.UTF-8
SegvAnalysis:
Segfault happened at: 0x7f294e6d7346 <_ZN6QMutex4lockEv+6>: mov (%rdi),%rbx
PC (0x7f294e6d7346) ok
source "(%rdi)" (0x8080808080808110) not located in a known VMA region (needed readable region)!
destination "%rbx" ok
Stack memory exhausted (SP below stack segment)
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: mythtv
StacktraceTop:
QMutex::lock() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
QMutex::lockInline (this=0x8080808080808110) at /usr/include/qt4/QtCore/qmutex.h:198
QMutexLocker::QMutexLocker (this=0x7f2927ffec20, m=0x8080808080808110) at /usr/include/qt4/QtCore/qmutex.h:109
MDBManager::PurgeIdleConnections (this=0x8080808080808110, leaveOne=false) at mythdbcon.cpp:365
MPoolThread::run (this=0x25f40d0) at mthreadpool.cpp:151
Title: mythpreviewgen crashed with SIGSEGV in QMutex::lock()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: audio cdrom dialout video

Tags:

Revision history for this message

Glenn Brumfield (brumfield-glenn) wrote on 2015-05-19:

.var.log.mythtv.mythbackend.log.txt Edit (5.6 MiB, text/plain; charset="utf-8")
.var.log.mythtv.mythcommflag.log.txt Edit (1.6 MiB, text/plain; charset="utf-8")
.var.log.mythtv.mythfrontend.log.txt Edit (7.8 MiB, text/plain; charset="utf-8")
.var.log.mythtv.mythmetadatalookup.log.txt Edit (1.9 MiB, text/plain; charset="utf-8")
.var.log.mythtv.mythpreviewgen.log.txt Edit (7.7 MiB, text/plain; charset="utf-8")
.var.log.mythtv.mythtranscode.log.txt Edit (14.3 KiB, text/plain; charset="utf-8")
.var.log.mythtv.mythtv.setup.log.txt Edit (200.2 KiB, text/plain; charset="utf-8")
CoreDump.gz Edit (7.1 MiB, application/x-gzip)
Dependencies.txt Edit (14.3 KiB, text/plain; charset="utf-8")
Disassembly.txt Edit (987 bytes, text/plain; charset="utf-8")
MythTVDirectoryPermissions.txt Edit (711 bytes, text/plain; charset="utf-8")
ProcMaps.txt Edit (65.3 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (820 bytes, text/plain; charset="utf-8")
Registers.txt Edit (900 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (1.9 KiB, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (23.9 KiB, text/plain; charset="utf-8")

information type:

Private → Public

Revision history for this message

James Cuzella (trinitronx) wrote on 2018-06-23:

same crash happens often on my system but while it is tuned to a TV channel (ATSC Digital OTA Antenna) which has bad signal quality. Crash happens also when Alt+Tab switching between applications and back to MythTV when it is still tuned to a frozen TV channel.

Trying to hit Escape to exit TV mode back to main menu usually triggers the crash.