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On Monday, 29 January 2018 11:32:56 CET Ren=E9 J.V. Bertin wrote:
> Hi,
>=20
> Researching an issue I'm seeing (hang/crash on exit) I found the following
> vestigial out-commented code the KCoreDirListerCache ctor in
> kcoredirlister.cpp:

=46YI: Note to the mailing list, before more precious developer time is bei=
ng=20
spent on this here:

There are two more follow-up posts, just a few more hours younger, related =
to=20
this issue on qt-interest:
  http://lists.qt-project.org/pipermail/interest/2018-January/029182.html
  (rather unrelated, but is also hinting at said problem...)
  http://lists.qt-project.org/pipermail/interest/2018-January/029194.html
  (asks about help for debugging crashes during destruction of QRegExpEngin=
e)

Regards,
Kevin

>     // Probably not needed in KF5 anymore:
>     // The use of KUrl::url() in ~DirItem (sendSignal) crashes if the sta=
tic
> for QRegExpEngine got deleted already, // so we need to destroy the
> KCoreDirListerCache before that.
>     //qAddPostRoutine(kDirListerCache.destroy);
>=20
> WHat's clear is that this no longer works: there is no `destroy` method in
> whatever kDirListerCache's real class is.
>=20
> Git blame is of little help here; can anyone remember why the explicit
> pro-active delete was deemed unnecessary, and what the exact symptoms were
> when this was not done in KDE4?
>=20
> FWIW, the crash (or hang) happens during QRegExpEngine take-down when I h=
ave
> used a KDE file dialog in a "pure Qt" application via a mechanism built on
> code taken from the plasma integration plugin. It does not happen in KF5
> applications like kate or kdialog. As far as I know those applications
> obtain the KDE file dialog from the platform plugin too. The difference
> must be in the order in which certain things are deleted during the global
> destruction phase, but which and how to restore the proper order. (The
> Audacious audioplayer had a similar issue on exit in its Qt5 version, whi=
ch
> I traced to the QApplication instance being deleted via atexit; a lucky
> shot in the dark that makes a lot of sense in retrospect.)
>=20
> Thanks for any pointers,
> R.


=2D-=20
Kevin Funk | kfunk@kde.org | http://kfunk.org
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