[mythtv-commits] Ticket #8986: mythfilldatabase hangs on MacOS in QFSFileEnginePrivate::nativeRead

MythTV mythtv at cvs.mythtv.org
Wed Sep 22 03:31:44 UTC 2010

#8986: mythfilldatabase hangs on MacOS in QFSFileEnginePrivate::nativeRead
     Reporter:  Andy Stevenson <lists@…>               |       Owner:  stuartm   
         Type:  patch                                  |      Status:  new       
     Priority:  minor                                  |   Milestone:  unknown   
    Component:  MythTV - Mythfilldatabase              |     Version:  0.23-fixes
     Severity:  medium                                 |    Keywords:            
Ticket locked:  0                                      |  
 I have a patch that fixes (works around) the hang in mythfilldatabase on

 According to some old posts, this bug appeared in 0.22 and is still
 present in 0.23.  It worked fine in 0.21.

 Reference post with stack trace:

 I have been running for several days with my patch, and it's working well.
 I am using 0.23-fixes.

 The bug is that QFSFileEnginePrivate::nativeRead does not correctly exit
 from its read loop when the end-of-stream is reached.  Instead, it gets
 stuck in a loop with errno==EINTR.

 GDB backtrace:
  - 0 0x9029d153 in fgetc ()
  - 1 0x8ea6acee in QFSFileEnginePrivate::nativeRead ()
  - 2 0x8ea2e1e0 in QFile::readData ()
  - 3 0x8ea34440 in QIODevice::read ()
  - 4 0x8cfb397e in copy ()

 Though the actual bug is likely down inside Qt, isolating that with a
 proper test case and producing a safe/correct fix is too high a barrier,
 so I hope this workaround will suffice for now.

 ./mythbackend.intel --version
 Please attach all output as a file in bug reports.
 MythTV Version   : 25586
 MythTV Branch    : branches/release-0-23-fixes
 Network Protocol : 23056
 Library API      :
 QT Version       : 4.6.0
 Options compiled in:
  debug darwin_da using_corevideo using_backend using_darwin
 using_disable_mmx_for_debugging using_firewire using_frontend
 using_hdhomerun using_iptv using_lirc using_mheg using_opengl_video
 using_qtwebkit using_appleremote using_bindings_perl using_bindings_python
 using_darwin_da using_opengl using_ffmpeg_threads using_live using_mheg

Ticket URL: <http://svn.mythtv.org/trac/ticket/8986>
MythTV <http://www.mythtv.org/>
MythTV Media Center

More information about the mythtv-commits mailing list