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Bug#697495: marked as done (libqt4-script: segfault in multiple programs)

Your message dated Sun, 6 Jan 2013 14:17:26 -0300
with message-id <201301061417.33529.perezmeyer@gmail.com>
and subject line Re: Bug#697495: libqt4-script: segfault in multiple programs
has caused the Debian Bug report #697495,
regarding libqt4-script: segfault in multiple programs
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
697495: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=697495
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libqt4-script
Version: 4:4.8.2+dfsg-2
Severity: normal

After upgrading my system, plasma-desktop and kwrite segfault on startup.  Both faults occur in exactly the same place in libqt4-script, so I am assigning here.
Downgrading back to 4:4.8.2+dfsg-2 fixes.

I believe the problem is the huge (2GB) allocation done at this point.  This fails on my system, even with 3G swap available, as I have memory overcommit disabled.
Is there any way to change this amount or (better) force dynamic allocation?

Attached backtrace from plasma-desktop.


-- System Information:
Debian Release: 7.0
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.2.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libqt4-script depends on:
ii  libc6              2.13-37
ii  libgcc1            1:4.7.2-4
ii  libqt4-dbus        4:4.8.2+dfsg-8
ii  libqtcore4         4:4.8.2+dfsg-8
ii  libstdc++6         4.7.2-4
ii  multiarch-support  2.13-37

libqt4-script recommends no packages.

libqt4-script suggests no packages.

-- no debconf information

Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f943b271780 (LWP 7881))]

Thread 2 (Thread 0x7f941f251700 (LWP 7882)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9434d7ae77 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f9435088640) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f9434d7aea9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f942f98ab50 in start_thread (arg=<optimized out>) at pthread_create.c:304
#4  0x00007f943ab7fa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f943b271780 (LWP 7881)):
[KCrash Handler]
#6  0x00007f9434c97c5e in FixedVMPoolAllocator (totalHeapSize=2147483648, commonSize=<optimized out>, this=0x2613c60) at ../3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp:310
#7  QTJSC::ExecutablePool::systemAlloc (size=16384) at ../3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp:443
#8  0x00007f9434d1c629 in ExecutablePool (n=<optimized out>, this=0x7f941e960960) at ../3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocator.h:258
#9  create (n=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocator.h:97
#10 ExecutableAllocator (this=0x7f941e95a9c8) at ../3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocator.h:150
#11 QTJSC::JSGlobalData::JSGlobalData (this=0x7f941e959800, isShared=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp:146
#12 0x00007f9434d1cdec in QTJSC::JSGlobalData::create () at ../3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp:205
#13 0x00007f9434dbd380 in QScriptEnginePrivate::QScriptEnginePrivate (this=0x2614740) at api/qscriptengine.cpp:979
#14 0x00007f9434dbe2fe in QScriptEngine::QScriptEngine (this=0x7fff81442430, parent=0x0) at api/qscriptengine.cpp:1976
#15 0x00007f9439857d9a in WorkspaceScripting::ScriptEngine::ScriptEngine(Plasma::Corona*, QObject*) () from /usr/lib/libplasmagenericshell.so.4
#16 0x00007f943ae61abb in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#17 0x00007f943ae69173 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#18 0x00007f943ae69531 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#19 0x00007f943a6be6dc in Plasma::Corona::initializeLayout (this=0x25a5cc0, configName=...) at ../../plasma/corona.cpp:184
#20 0x00007f943ae89ea3 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#21 0x00007f943ae8a1ed in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#22 0x00007f943ae8b67a in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#23 0x00007f9437d21a2e in QObject::event (this=0x2483e10, e=<optimized out>) at kernel/qobject.cpp:1195
#24 0x00007f94370b8814 in QApplication::event (this=0x2483e10, e=0x25c1c30) at kernel/qapplication.cpp:2538
#25 0x00007f94370b670c in QApplicationPrivate::notify_helper (this=this@entry=0x2488850, receiver=receiver@entry=0x2483e10, e=e@entry=0x25c1c30) at kernel/qapplication.cpp:4556
#26 0x00007f94370bab8a in QApplication::notify (this=0x2483e10, receiver=0x2483e10, e=0x25c1c30) at kernel/qapplication.cpp:4417
#27 0x00007f9438a15886 in KApplication::notify (this=0x2483e10, receiver=0x2483e10, event=0x25c1c30) at ../../kdeui/kernel/kapplication.cpp:311
#28 0x00007f9437d0cb5e in QCoreApplication::notifyInternal (this=0x2483e10, receiver=receiver@entry=0x2483e10, event=event@entry=0x25c1c30) at kernel/qcoreapplication.cpp:915
#29 0x00007f9437d109e1 in sendEvent (event=0x25c1c30, receiver=0x2483e10) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#30 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x23fc1f0) at kernel/qcoreapplication.cpp:1539
#31 0x00007f9437d3b0e3 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#32 postEventSourceDispatch (s=0x2478fc0) at kernel/qeventdispatcher_glib.cpp:279
#33 0x00007f942ee7b355 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007f942ee7b688 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007f942ee7b744 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f9437d3b276 in QEventDispatcherGlib::processEvents (this=0x23fdad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#37 0x00007f943715783e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#38 0x00007f9437d0b8af in QEventLoop::processEvents (this=this@entry=0x7fff81443190, flags=...) at kernel/qeventloop.cpp:149
#39 0x00007f9437d0bb38 in QEventLoop::exec (this=0x7fff81443190, flags=...) at kernel/qeventloop.cpp:204
#40 0x00007f9437d10cf8 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#41 0x00007f943ae724c5 in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#42 0x00007f943aac3ead in __libc_start_main (main=<optimized out>, argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff81443478) at libc-start.c:228
#43 0x0000000000400781 in _start ()

--- End Message ---
--- Begin Message --- 
On Sun 06 Jan 2013 13:43:48 Lisandro Damián Nicanor Pérez Meyer escribió:
> On Sun 06 Jan 2013 12:23:14 Lisandro Damián Nicanor Pérez Meyer escribió:
> > Control: tag -1 unreproducible moreinfo
> > 
> > On Sun 06 Jan 2013 04:05:39 spikethehobbitmage.excite escribió:
> > > Package: libqt4-script
> > > Version: 4:4.8.2+dfsg-2
> > > Severity: normal
> > > 
> > > After upgrading my system, plasma-desktop and kwrite segfault on
> > > startup. Both faults occur in exactly the same place in libqt4-script,
> > > so I am assigning here. Downgrading back to 4:4.8.2+dfsg-2 fixes.
> > > 
> > > I believe the problem is the huge (2GB) allocation done at this point.
> > > This fails on my system, even with 3G swap available, as I have memory
> > > overcommit disabled. Is there any way to change this amount or (better)
> > > force dynamic allocation?
> > > 
> > > Attached backtrace from plasma-desktop.
> > 
> > Hi! Have you filled the bug after switching back to 4:4.8.2+dfsg-2?
> > Because the bug has been reported to this version while you have -8 as
> > dependencies.
> > 
> > It would be good to know in which exact version you have the bug (a mix
> > is not good for a proper bug report).
> > 
> > Please fully upgrade to the version that has the problem and check again.
> 
> Just for the record, this could be related to this patch (and I actually
> think it is):
> 
> <http://patch-tracker.debian.org/patch/series/view/qt4-
> x11/4:4.8.2+dfsg-8/add_missing_map_noreserve.patch>
> 
> Allowing mapping in swap created crashes in other parts of the code.

- You don't see this bug in 4:4.8.2+dfsg-2 because the patch was not applied 
in that version.

- According to the backtrace, the crash is happening because the code is 
requesting a crash.

I'm so closing this bug because what's happening is what the code is 
requesting.

If you really want to avoid this crash with memory overcommit disabled let me 
suggest you to fill a wishlist bug upstream. All I can say is that requesting 
memory from swap was a non-go.

Kinds regards, Lisandro.

-- 
7: Hay diferencia entre "cortar" un archivo y "borrarlo" o "eliminarlo"
    * Depende cuando se "cuelgue" Windows
    Damian Nadales
    http://mx.grulic.org.ar/lurker/message/20080307.141449.a70fb2fc.es.html

Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/

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