wxGUI: crash with ValueError: list.remove(x): x not in list

[neteler]

At time, on Fedora 29, both G78 and master fail to start the GUI (after make distclean and recompile):

g.gui
Traceback (most recent call last):
  File "/home/mundialis/software/grass_master/dist.x86_64-pc-linux-gnu/gui/wxpython/wxgui.py", line 106, in OnInit
    workspace=self.workspaceFile)
  File "/home/mundialis/software/grass_master/dist.x86_64-pc-linux-gnu/gui/wxpython/lmgr/frame.py", line 143, in __init__
    self.notebook = self._createNoteBook()
  File "/home/mundialis/software/grass_master/dist.x86_64-pc-linux-gnu/gui/wxpython/lmgr/frame.py", line 338, in _createNoteBook
    gcstyle=GC_PROMPT)
  File "/home/mundialis/software/grass_master/dist.x86_64-pc-linux-gnu/gui/wxpython/gui_core/goutput.py", line 118, in __init__
    self.cmdPrompt = GPromptSTC(parent=self, menuModel=self._menuModel)
  File "/home/mundialis/software/grass_master/dist.x86_64-pc-linux-gnu/gui/wxpython/gui_core/prompt.py", line 138, in __init__
    GPrompt.__init__(self, parent=parent, menuModel=menuModel)
  File "/home/mundialis/software/grass_master/dist.x86_64-pc-linux-gnu/gui/wxpython/gui_core/prompt.py", line 57, in __init__
    self.mapsetList = utils.ListOfMapsets()
  File "/home/mundialis/software/grass_master/dist.x86_64-pc-linux-gnu/gui/wxpython/core/utils.py", line 308, in ListOfMapsets
    mapsets.remove(mapset)
ValueError: list.remove(x): x not in list
OnInit returned false, exiting...
Error in atexit._run_exitfuncs:
wx._core.wxAssertionError: C++ assertion "GetEventHandler() == this" failed at ../src/common/wincmn.cpp(478) in ~wxWindowBase(): any pushed event handlers must have been removed

g.mapsets -p
Accessible mapsets:
ortsteil_1 PERMANENT


g.version -rge
version=7.9.dev
date=2019
revision=69bd92a94
build_date=2019-10-03
build_platform=x86_64-pc-linux-gnu
build_off_t_size=8
libgis_revision=00000
libgis_date="?"
proj=4.9.3
gdal=2.3.2
geos=3.6.1
sqlite=3.26.0

Not sure what causes this (on Fedora 30 no such problem)...

[annakrat]

Does this happen in any location? What does g.mapsets -l return? I don't see anything problematic and it works here, so you would have to investigate what it is trying to remove in core/utils.py L308.

[neteler]

Replying to annakrat:

Does this happen in any location?

No, see below.

What does g.mapsets -l return?

It returns a list of mapsets, all exist.

I don't see anything problematic and it works here, so you would have to investigate what it is trying to remove in core/utils.py L308.

Ok, this helped to debug the problem:

The actual mapset lacks the WIND file:

g.region -p
ERROR: Unable to open element file <> for <WIND@ortsteil_1>

I have no clue how this happened but I thought we had an "auto-repair" in place somewhere (like we do for the sqlite/ subdir).

A possibility might be to catch such an error (earlier) and reject to start GRASS with a broken mapset. Or, tu execute in such cases

g.region -d

to generate the missing WIND file.

[neteler]

We may consider this "wontfix" since broken mapsets very rarely occur...

[annakrat]

Reopen if needed.