Jörn,
No, I definitely had not updated Manjaro between the last successful launch
of darktable, and when it failed.

As for the contents of /etc/fonts/fonts.conf, I don't appear to have either
the directory or the file....


*cd ~/etc

            cd: no such file or directory: /home/audio2u/etc*

There IS a fonts.conf file in my Home directory though.
Its contents don't extend to line 29, though. Here are the contents of that
file:


























*<?xml version='1.0'?><!DOCTYPE fontconfig SYSTEM
'fonts.dtd'><fontconfig> <dir>~/.fonts</dir> <match target="font">  <edit
name="rgba" mode="assign">   <const>rgb</const>  </edit> </match> <match
target="font">  <edit name="hinting" mode="assign">   <bool>true</bool>
</edit> </match> <match target="font">  <edit name="hintstyle"
mode="assign">   <const>hintslight</const>  </edit> </match> <match
target="font">  <edit name="antialias" mode="assign">   <bool>true</bool>
</edit> </match></fontconfig>*

No, I did not mount a camera, although I MAY have had a USB key attached at
the time. Not sure now.
Attempting to launch darktable with camera control disabled yielded this:


























































































































































































*darktable -d camctl

             This GDB supports auto-downloading debuginfo from the
following URLs:  <https://debuginfod.archlinux.org
<https://debuginfod.archlinux.org>>Enable debuginfod for this session? (y
or [n]) [answered N; input not from terminal]Debuginfod has been
disabled.To make this setting permanent, add 'set debuginfod enabled off'
to .gdbinit.[New LWP 1913][New LWP 1914][New LWP 1915][New LWP 1916][New
LWP 1917][New LWP 1918][New LWP 1919][New LWP 1920][New LWP 1921][New LWP
1922][New LWP 1923][New LWP 1924][New LWP 1925][Thread debugging using
libthread_db enabled]Using host libthread_db library
"/usr/lib/libthread_db.so.1".0x00007f6c50cfa8b7 in wait4 () from
/usr/lib/libc.so.6warning: Currently logging to
/tmp/darktable_bt_CGS091.txt.  Turn the logging off and on to make the new
setting effective.#0  0x00007f6c50cfa8b7 in wait4 () at
/usr/lib/libc.so.6#1  0x00007f6c5119df82 in  () at
/usr/bin/../lib/darktable/libdarktable.so#2  0x00007f6c50c3e710 in <signal
handler called> () at /usr/lib/libc.so.6#3  0x00007f6c50c8fdb4 in
pthread_mutex_lock () at /usr/lib/libc.so.6#4  0x00007f6c510c263c in
dt_cache_get_with_caller () at /usr/bin/../lib/darktable/libdarktable.so#5
 0x00007f6c51138252 in dt_image_cache_get () at
/usr/bin/../lib/darktable/libdarktable.so#6  0x00007f6c5113930d in
dt_image_set_raw_aspect_ratio () at
/usr/bin/../lib/darktable/libdarktable.so#7  0x00007f6c510c3ea5 in
dt_collection_update () at /usr/bin/../lib/darktable/libdarktable.so#8
 0x00007f6c510d133e in dt_collection_update_query () at
/usr/bin/../lib/darktable/libdarktable.so#9  0x00007f6c510c5199 in
dt_collection_new () at /usr/bin/../lib/darktable/libdarktable.so#10
0x00007f6c510e4317 in dt_init () at
/usr/bin/../lib/darktable/libdarktable.so#11 0x000055e7d683c03d in  ()#12
0x00007f6c50c27cd0 in  () at /usr/lib/libc.so.6#13 0x00007f6c50c27d8a in
__libc_start_main () at /usr/lib/libc.so.6#14 0x000055e7d683c0b5 in
 ()=========  Id   Target Id                                        Frame *
1    Thread 0x7f6c3f49e680 (LWP 1910) "darktable"     0x00007f6c50cfa8b7 in
wait4 () from /usr/lib/libc.so.6  2    Thread 0x7f6c3efff6c0 (LWP 1913)
"pool-spawner"  0x00007f6c50d0ee2d in syscall () from /usr/lib/libc.so.6  3
   Thread 0x7f6c3e7fe6c0 (LWP 1914) "gmain"         0x00007f6c50d0365f in
poll () from /usr/lib/libc.so.6  4    Thread 0x7f6c3dffd6c0 (LWP 1915)
"pool"          0x00007f6c50d0ee2d in syscall () from /usr/lib/libc.so.6  5
   Thread 0x7f6c3d7fc6c0 (LWP 1916) "gdbus"         0x00007f6c50d0365f in
poll () from /usr/lib/libc.so.6  6    Thread 0x7f6c3cdd86c0 (LWP 1917)
"worker 0"      0x00007f6c50c894ae in ?? () from /usr/lib/libc.so.6  7
 Thread 0x7f6c2ffff6c0 (LWP 1918) "worker 1"      0x00007f6c50c894ae in ??
() from /usr/lib/libc.so.6  8    Thread 0x7f6c2f7fe6c0 (LWP 1919) "worker
2"      0x00007f6c50c894ae in ?? () from /usr/lib/libc.so.6  9    Thread
0x7f6c2effd6c0 (LWP 1920) "worker 3"      0x00007f6c50c894ae in ?? () from
/usr/lib/libc.so.6  10   Thread 0x7f6c2e7fc6c0 (LWP 1921) "kicker"
 0x00007f6c50cd58f5 in clock_nanosleep () from /usr/lib/libc.so.6  11
Thread 0x7f6c2dffb6c0 (LWP 1922) "worker res 0"  0x00007f6c50c894ae in ??
() from /usr/lib/libc.so.6  12   Thread 0x7f6c2d7fa6c0 (LWP 1923) "worker
res 1"  0x00007f6c50c894ae in ?? () from /usr/lib/libc.so.6  13   Thread
0x7f6c2cff96c0 (LWP 1924) "worker res 2"  0x00007f6c50c894ae in ?? () from
/usr/lib/libc.so.6  14   Thread 0x7f6c13fff6c0 (LWP 1925) "gphoto_update"
0x00007f6c50cd58f5 in clock_nanosleep () from
/usr/lib/libc.so.6=========Thread 14 (Thread 0x7f6c13fff6c0 (LWP 1925)
"gphoto_update"):#0  0x00007f6c50cd58f5 in clock_nanosleep () at
/usr/lib/libc.so.6#1  0x00007f6c50ce7fb7 in nanosleep () at
/usr/lib/libc.so.6#2  0x00007f6c50b3d1c1 in g_usleep () at
/usr/lib/libglib-2.0.so.0#3  0x00007f6c51312f6b in dt_update_cameras_thread
() at /usr/bin/../lib/darktable/libdarktable.so#4  0x00007f6c50c8c9eb in
 () at /usr/lib/libc.so.6#5  0x00007f6c50d10ebc in  () at
/usr/lib/libc.so.6Thread 13 (Thread 0x7f6c2cff96c0 (LWP 1924) "worker res
2"):#0  0x00007f6c50c894ae in  () at /usr/lib/libc.so.6#1
 0x00007f6c50c8bd40 in pthread_cond_wait () at /usr/lib/libc.so.6#2
 0x00007f6c511ac6ae in  () at /usr/bin/../lib/darktable/libdarktable.so#3
 0x00007f6c50c8c9eb in  () at /usr/lib/libc.so.6#4  0x00007f6c50d10ebc in
 () at /usr/lib/libc.so.6Thread 12 (Thread 0x7f6c2d7fa6c0 (LWP 1923)
"worker res 1"):#0  0x00007f6c50c894ae in  () at /usr/lib/libc.so.6#1
 0x00007f6c50c8bd40 in pthread_cond_wait () at /usr/lib/libc.so.6#2
 0x00007f6c511ac6ae in  () at /usr/bin/../lib/darktable/libdarktable.so#3
 0x00007f6c50c8c9eb in  () at /usr/lib/libc.so.6#4  0x00007f6c50d10ebc in
 () at /usr/lib/libc.so.6Thread 11 (Thread 0x7f6c2dffb6c0 (LWP 1922)
"worker res 0"):#0  0x00007f6c50c894ae in  () at /usr/lib/libc.so.6#1
 0x00007f6c50c8bd40 in pthread_cond_wait () at /usr/lib/libc.so.6#2
 0x00007f6c511ac6ae in  () at /usr/bin/../lib/darktable/libdarktable.so#3
 0x00007f6c50c8c9eb in  () at /usr/lib/libc.so.6#4  0x00007f6c50d10ebc in
 () at /usr/lib/libc.so.6Thread 10 (Thread 0x7f6c2e7fc6c0 (LWP 1921)
"kicker"):#0  0x00007f6c50cd58f5 in clock_nanosleep () at
/usr/lib/libc.so.6#1  0x00007f6c50ce7fb7 in nanosleep () at
/usr/lib/libc.so.6#2  0x00007f6c50cf8f1e in sleep () at
/usr/lib/libc.so.6#3  0x00007f6c511ac993 in  () at
/usr/bin/../lib/darktable/libdarktable.so#4  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#5  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
9 (Thread 0x7f6c2effd6c0 (LWP 1920) "worker 3"):#0  0x00007f6c50c894ae in
 () at /usr/lib/libc.so.6#1  0x00007f6c50c8bd40 in pthread_cond_wait () at
/usr/lib/libc.so.6#2  0x00007f6c511acca2 in  () at
/usr/bin/../lib/darktable/libdarktable.so#3  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#4  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
8 (Thread 0x7f6c2f7fe6c0 (LWP 1919) "worker 2"):#0  0x00007f6c50c894ae in
 () at /usr/lib/libc.so.6#1  0x00007f6c50c8bd40 in pthread_cond_wait () at
/usr/lib/libc.so.6#2  0x00007f6c511acca2 in  () at
/usr/bin/../lib/darktable/libdarktable.so#3  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#4  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
7 (Thread 0x7f6c2ffff6c0 (LWP 1918) "worker 1"):#0  0x00007f6c50c894ae in
 () at /usr/lib/libc.so.6#1  0x00007f6c50c8bd40 in pthread_cond_wait () at
/usr/lib/libc.so.6#2  0x00007f6c511acca2 in  () at
/usr/bin/../lib/darktable/libdarktable.so#3  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#4  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
6 (Thread 0x7f6c3cdd86c0 (LWP 1917) "worker 0"):#0  0x00007f6c50c894ae in
 () at /usr/lib/libc.so.6#1  0x00007f6c50c8bd40 in pthread_cond_wait () at
/usr/lib/libc.so.6#2  0x00007f6c511acca2 in  () at
/usr/bin/../lib/darktable/libdarktable.so#3  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#4  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
5 (Thread 0x7f6c3d7fc6c0 (LWP 1916) "gdbus"):#0  0x00007f6c50d0365f in poll
() at /usr/lib/libc.so.6#1  0x00007f6c50b6cc2f in  () at
/usr/lib/libglib-2.0.so.0#2  0x00007f6c50b0efef in g_main_loop_run () at
/usr/lib/libglib-2.0.so.0#3  0x00007f6c4ff0f28c in  () at
/usr/lib/libgio-2.0.so.0#4  0x00007f6c50b41d75 in  () at
/usr/lib/libglib-2.0.so.0#5  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#6  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
4 (Thread 0x7f6c3dffd6c0 (LWP 1915) "pool"):#0  0x00007f6c50d0ee2d in
syscall () at /usr/lib/libc.so.6#1  0x00007f6c50b65533 in g_cond_wait_until
() at /usr/lib/libglib-2.0.so.0#2  0x00007f6c50ada115 in  () at
/usr/lib/libglib-2.0.so.0#3  0x00007f6c50ada277 in
g_async_queue_timeout_pop () at /usr/lib/libglib-2.0.so.0#4
 0x00007f6c50b44bee in  () at /usr/lib/libglib-2.0.so.0#5
 0x00007f6c50b41d75 in  () at /usr/lib/libglib-2.0.so.0#6
 0x00007f6c50c8c9eb in  () at /usr/lib/libc.so.6#7  0x00007f6c50d10ebc in
 () at /usr/lib/libc.so.6Thread 3 (Thread 0x7f6c3e7fe6c0 (LWP 1914)
"gmain"):#0  0x00007f6c50d0365f in poll () at /usr/lib/libc.so.6#1
 0x00007f6c50b6cc2f in  () at /usr/lib/libglib-2.0.so.0#2
 0x00007f6c50b0d0e2 in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0#3  0x00007f6c50b0d132 in  () at
/usr/lib/libglib-2.0.so.0#4  0x00007f6c50b41d75 in  () at
/usr/lib/libglib-2.0.so.0#5  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#6  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
2 (Thread 0x7f6c3efff6c0 (LWP 1913) "pool-spawner"):#0  0x00007f6c50d0ee2d
in syscall () at /usr/lib/libc.so.6#1  0x00007f6c50b64ca7 in g_cond_wait ()
at /usr/lib/libglib-2.0.so.0#2  0x00007f6c50ada144 in  () at
/usr/lib/libglib-2.0.so.0#3  0x00007f6c50b442fe in  () at
/usr/lib/libglib-2.0.so.0#4  0x00007f6c50b41d75 in  () at
/usr/lib/libglib-2.0.so.0#5  0x00007f6c50c8c9eb in  () at
/usr/lib/libc.so.6#6  0x00007f6c50d10ebc in  () at /usr/lib/libc.so.6Thread
1 (Thread 0x7f6c3f49e680 (LWP 1910) "darktable"):#0  0x00007f6c50cfa8b7 in
wait4 () at /usr/lib/libc.so.6#1  0x00007f6c5119df82 in  () at
/usr/bin/../lib/darktable/libdarktable.so#2  0x00007f6c50c3e710 in <signal
handler called> () at /usr/lib/libc.so.6#3  0x00007f6c50c8fdb4 in
pthread_mutex_lock () at /usr/lib/libc.so.6#4  0x00007f6c510c263c in
dt_cache_get_with_caller () at /usr/bin/../lib/darktable/libdarktable.so#5
 0x00007f6c51138252 in dt_image_cache_get () at
/usr/bin/../lib/darktable/libdarktable.so#6  0x00007f6c5113930d in
dt_image_set_raw_aspect_ratio () at
/usr/bin/../lib/darktable/libdarktable.so#7  0x00007f6c510c3ea5 in
dt_collection_update () at /usr/bin/../lib/darktable/libdarktable.so#8
 0x00007f6c510d133e in dt_collection_update_query () at
/usr/bin/../lib/darktable/libdarktable.so#9  0x00007f6c510c5199 in
dt_collection_new () at /usr/bin/../lib/darktable/libdarktable.so#10
0x00007f6c510e4317 in dt_init () at
/usr/bin/../lib/darktable/libdarktable.so#11 0x000055e7d683c03d in  ()#12
0x00007f6c50c27cd0 in  () at /usr/lib/libc.so.6#13 0x00007f6c50c27d8a in
__libc_start_main () at /usr/lib/libc.so.6#14 0x000055e7d683c0b5 in
 ()[Inferior 1 (process 1910) detached]backtrace written to
/tmp/darktable_bt_CGS091.txtzsh: segmentation fault (core dumped)
 darktable -d camctlwhich darktable?

                              zsh: no matches found: darktable?*

...which is clearly NOT accurate, because I could launch it from the
command line with a custom path to the config directory.

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