Darktable from Master does not open / hangs

[YAFU]

My system: Kubuntu 20.04 (KDE) - GTX 960

When I try to open my CR2 files as usual, Darktable just ends up showing only a small empty window. I must kill Darktable process. The problem occurs even with empty "~ /.config/darktable/" folder.
I have built Darktable with:
./build.sh --prefix /home/yafu/.darktable_master --buildtype RelWithDebInfo

Then when I start darktable from the terminal:
./darktable -d all IMG_4537.CR2

this is part of the output I get until it hangs:
https://pastebin.com/RLWdvNnQ

I'm not sure why this makes so much reference to "/media/TEMPORAL/@@Darktable_Git/darktable/" location, which is the path where I have the sources, not the binaries.

Darktable opens correctly if I run darktable binary. The problem occurs only if I want to open image files "with" darktable. It is always reproducible. I think the problem occurred more than a month ago, I really didn't have time before making the report. The last known version that works correctly on my system is: 3.1.0+1795~g0c7527f8c

Edit:
Just in case my bad English:
when I said "I think the problem occurred more than a month ago", it was actually "I think the problem started happening for about a month, and still the problem is present in current master on my system"

[TurboGit]

Works for me on current master. This is reassuring as it probably means a build or context setup and not something broken on the release which is very close now.

[YAFU]

Just in case my bad English:
when I said "I think the problem occurred more than a month ago", it was actually "I think the problem started happening for about a month, and still the problem is present in current master on my system"

[ptilopteri]

what manner are you using to "open an image with darktable"

try to open an image with following command-line:
darktable --library :memory:

[YAFU]

I have associated image files to be opened with Darktable built by myself in KDE. Anyway the problem also occurs from the terminal with the order that I show in the first message. Also the problem is present with the order you show:

• With empty "~ /.config/darktable/" folder I get:

$ ./darktable --library :memory: IMG_4537.CR2
[defaults] found a 64-bit system with 24574004 kb ram and 8 cores (0 atom based)
[defaults] setting very high quality defaults

(darktable:3289552): GLib-CRITICAL **: 23:00:48.189: g_variant_unref: assertion 'value != NULL' failed
ERROR in lualib, couldn't find a position for `lua scripts installer', this should never happen
[image_cache_allocate] failed to open image 4294967295 from database: no more rows available

At this point only the next files are created in "~ /.config/darktable/" : data.db, data.db-pre-3.1.0 (0 B), data.db.lock, keyboardrc, keyboardrc_default

• After all files are created in "~ /.config/darktable/" by running darktable binary and then trying again:

$ ./darktable --library :memory: IMG_4537.CR2
ERROR in lualib, couldn't find a position for `lua scripts installer', this should never happen
[image_cache_allocate] failed to open image 4294967295 from database: no more rows available

(I have copied "IMG_4537.CR2" image to the same path of darktable binary just so I don't have to write the path in each test)
Darktable was hung and never finished opening in both cases from the terminal.

[ptilopteri]

@YAFU appears you have displayed your problem,
ERROR in lualib, couldn't find a position for `lua scripts installer', ...

but I cannot advise further. I believe "William Ferguson" is the LUA expert.

[YAFU]

Okay.
Another question. Doing tests I just accidentally deleted binaries of my latest functional version that I had (3.1.0+1795~g0c7527f8c)
How do I "git checkout" that version? I have tried "git checkout g0c7527f8c", but a message tells me that there is no such version.
EDIT:
Ok, I checkout by date:
https://stackoverflow.com/questions/6990484/how-to-checkout-in-git-by-date

{2020-06-26 18:30:00} -> still doesn't work.

{2020-06-20 18:30:00} -> this version worked.

[YAFU]

I have done a google search related to: ERROR in lualib, couldn't find a position for

Seems most of the time this happens in KDE?
What could be causing the problem?

This is my cmake-gui config related to LUA:

[ptilopteri]

doesn't happen to me in plasma5/kde5

[YAFU]

Ok, thanks for testing.
I have been able to shorten to one day the period where the problem started to occur:
{2020-06-22 18:30:00} -> still doesn't work.

{2020-06-21 18:30:00} -> this version worked.

What commit could be related to the problem within those 24 hours?

[ptilopteri]

close darktable
try moving /home//.config/darktable/luarc to a different filename, ie:
/home//.config/darktable/xxluarc
and test again where you see dt failing

[YAFU]

In that location I have data, library and keyboard files, but I don't have that file /home/.config/darktable/luarc
That file was never created there, even with working Darktable version.

Anyway the problem/hang occurs even deleting all files there (Empty /.config/darktable/)

[ptilopteri]

Then one more test. Remove your build of dt and install one of the precompiled packages provided at:
https://www.darktable.org/install/

if that works, there is a problem with your compile procedure or your system.

[YAFU]

I have downloaded and installed: darktable_3.3.0~git2.c94b5fda3_amd64.deb
https://software.opensuse.org/download.html?project=graphics:darktable:master&package=darktable

It also hangs at startup when I try to open images with it.
I think the key to my problem is in commits that occurred between June 21-22. I have no idea how to see it.

[ptilopteri]

try running dt as a different/new user

[johnny-bit]

@YAFU - if you know how and can compile your own install, then there's git bisect tht could aid you in tracing from which commit the issue came.

As for commits - remove "g" in front of version in order to checkout given ver, eg: instead of g0c7527f8c use 0c7527f8c, see: 0c7527f