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List:       kde-devel
Subject:    Crash in KTar
From:       Andras Mantia <amantia () virtualartisans ! com>
Date:       2002-12-13 12:33:11
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Hi,

 There is something wrong with KTar class in HEAD. The following code worked 
OK some weeks ago, but now it crashes:

  KTempFile* tempFile = new KTempFile(tmpDir, ".tgz");
  tempFile->setAutoDelete(true);
//pack the .tag files and the description.rc into a .tgz file
  KTar tar(tempFile->name(), "application/x-gzip");
  tar.open(IO_WriteOnly);
...
  KURL::List files = QExtFileInfo::allFilesRelative(dirURL, "*");
  for ( KURL::List::Iterator it_f = files.begin(); it_f != files.end(); ++it_f 
)
  {
    QString name = (*it_f).fileName();

    QFile file(dirURL.path()+name);
    file.open(IO_ReadOnly);
    QByteArray bArray = file.readAll();
    tar.writeFile(dirURL.fileName()+"/"+name, "user", "group", bArray.size(), 
bArray.data());
    file.close();
  }
  tar.close();

The crash is at tar.writeFile() and the backtrace is:
[New Thread 1024 (LWP 21085)]
0x4140a079 in wait4 () from /lib/libc.so.6
#0  0x4140a079 in wait4 () from /lib/libc.so.6
#1  0x41484b98 in __DTOR_END__ () from /lib/libc.so.6
#2  0x41266072 in waitpid () from /lib/libpthread.so.0
#3  0x40a44fcb in KCrash::defaultCrashHandler ()
   from /opt/kde-cvs/lib/libkdecore.so.4
#4  0x41263a74 in pthread_sighandler () from /lib/libpthread.so.0
#5  <signal handler called>
#6  0x413dd7f7 in memcpy () from /lib/libc.so.6
#7  0x41c03f46 in KGzipFilter::uncompress ()
   from /opt/kde-cvs/lib/kde3/kgzipfilter.so
#8  0x405d2ea7 in KFilterDev::readBlock () from /opt/kde-cvs/lib/libkio.so.4
#9  0x405d2ce8 in KFilterDev::at () from /opt/kde-cvs/lib/libkio.so.4
#10 0x40609213 in KTar::prepareWriting () from /opt/kde-cvs/lib/libkio.so.4
#11 0x40616114 in KArchive::writeFile () from /opt/kde-cvs/lib/libkio.so.4
#12 0x080a2be9 in QuantaApp::slotEmailDTD (this=0x8207d50) at quanta.cpp:2477

Sometimes it crashes at first run, sometimes on the second. And what is even 
more strange that for some seconds after the crash, the keyboard slows down, 
even if top shows that the CPU is 99% idle. 

The main question is: does anybody know why that crash happens now? I would be 
also thank if somebody would test if Quanta 3.1 (from KDE 3.1 RC5) crashes or 
not with KDE 3.1 BRANCH when you select eg. "Tools->Send DTD in E-Mail". I'm 
worried as I use the KTar in lot of places in Quanta, and this means crash in 
lot of places. :-(

Andras


 
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