Crashes immediately when INKSCAPE_DEBUG_LOG set

[Filip Dominec]

In order to trace other critical bugs in "Inkscape 0.91+devel r" on Lubuntu vivid (64-bit), I launched it using:

    export INKSCAPE_DEBUG_LOG=/tmp/inksc2
    inkscape

Then I opened some PDF file and after a while I could reproduce another bug that made Inkscape freeze. (This freezing occurs when I edit some text for a longer time independent of the presence of the "ibus*" package. However it behaves somewhat randomly and I will discuss it in another bugreport once this logging issue is resolved.)

Re-launching Inkscape is not possible anymore with the INKSCAPE_DEBUG_LOG variable set - it crashes immediately. At every such occasion it generates a big 10MB logfile which does not make any sense to me. I attach the file below for further evaluation; full file could not be uploaded in this report due to Launchpad timeout errors (*sigh*). The command line output during the crash is:

    ** (inkscape:13017): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

    Emergency save activated!
    Emergency save completed. Inkscape will close now.
    If you can reproduce this crash, please file a bug at www.inkscape.org
    with a detailed description of the steps leading to the crash, so we can fix it.
    Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
    **
    ERROR:../../src/sp-namedview.cpp:1078:SPNamedView* sp_document_namedview(SPDocument*, const gchar*): assertion failed: (nv != NULL)
    Aborted (core dumped)

Without the debugging option, Inkscape can be launched, but gives no insight into what happens when it freezes.

[Filip Dominec (fdominec)]

Here I attach the zipped log that Inkscape outputs during the crash.

[jazzynico (jazzynico)]

Reproduced on Xubuntu 15.10, Inkscape 0.91 and trunk rev. 14862.
GDB trace attached.