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[Alexandre Abreu <alexandre.abreu@xxxxxxxxxxxxx>]

** Changed in: webbrowser-app (Ubuntu)
     Assignee: (unassigned) => Alexandre Abreu (abreu-alexandre)

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https://bugs.launchpad.net/bugs/1377513

Title:
  avalanche of messages from Launchpad on standard error

Status in “webbrowser-app” package in Ubuntu:
  New

Bug description:
  When I use Launchpad as a desktop application starting it in a
  console:

  { /usr/bin/webapp-container --app-id=Launchpadlaunchpadnet
  --webapp=TGF1bmNocGFk --enable-back-forward; }

  the application prints lots of messages to the standard error.  The
  window does not handle mouse clicks while this happens, accumulating
  them into a buffer instead.  In particular, scrolling and navigation
  works only after it has stopped printing.

  The messages from a short session attached.

  Stack trace:

  #0  qt_message_print (msgType=msgType@entry=QtDebugMsg, context=...,
      message=...) at global/qlogging.cpp:929
  #1  0x00007ffff77b8fbd in qt_message(QtMsgType, const QMessageLogContext &, const char *, typedef __va_list_tag __va_list_tag *, QString &) (
      msgType=msgType@entry=QtDebugMsg, context=...,
      msg=msg@entry=0x7ffff6095053 "%s", ap=ap@entry=0x7fffffffc938, buf=...)
      at global/qlogging.cpp:245
  #2  0x00007ffff77b90f2 in QMessageLogger::debug (
      this=this@entry=0x7fffffffcab0, msg=msg@entry=0x7ffff6095053 "%s")
      at global/qlogging.cpp:261
  #3  0x00007ffff5ff9131 in writeToConsole (logType=Log,
      printStack=<optimized out>, ctx=<optimized out>, ctx=<optimized out>)
      at qml/v8/qqmlbuiltinfunctions.cpp:1394
  #4  0x00007ffff5ec2202 in QV4::BuiltinFunction::call (that=0x7fffe8033650,
      callData=<optimized out>) at jsruntime/qv4functionobject.cpp:622
  #5  0x00007ffff5e8e6ca in call (callData=0x7fffc2d66c28, this=<optimized out>)
      at jsruntime/qv4functionobject_p.h:133
  #6  QV4::__qmljs_call_property (context=0x7fffc00193e0, name=..., callData=...)
      at jsruntime/qv4runtime.cpp:915
  #7  0x00007fffe00d8f3a in ?? ()

  (probably JIT-compiled, confuses gdb).

  The offending message gets dumped from <URL: file:///usr/lib/x86_64
  -linux-gnu/qt5/qml/Ubuntu/UnityWebApps/UnityWebApps.js#line=111 >.
  This ultimately evaluates to a serial call to console.log, which
  blocks the application if the output device is slow.

  See also <URL: news:1bp21kqu4hqss$.31ga4jgjsbk6.dlg@xxxxxxxxxx >.  I
  am also told one could use non-blocking I/O for console output.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: webapp-container 0.23+14.04.20140428-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Oct  4 22:25:21 2014
  InstallationDate: Installed on 2014-08-20 (45 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: webbrowser-app
  UpgradeStatus: No upgrade log present (probably fresh install)

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