this is darktable 4.0.1 reporting a segfault:

warning: Currently logging to /tmp/darktable_bt_TBLTS1.txt.  Turn the logging off and on to make the new setting effective.
#0  0x00007fbb925aac7f in __GI___wait4 (pid=2464, stat_loc=0x0, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:27
#1  0x00007fbb928966b0 in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#2  <signal handler called>
#3  __GI___pthread_mutex_lock (mutex=0x0) at ../nptl/pthread_mutex_lock.c:67
#4  0x00007fbb9279b8f0 in dt_cache_get_with_caller () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#5  0x00007fbb92822cf1 in dt_image_cache_get () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#6  0x00007fbb9281bc6c in dt_image_set_raw_aspect_ratio () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#7  0x00007fbb927a0bd3 in dt_collection_update () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#8  0x00007fbb927a2107 in dt_collection_update_query () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#9  0x00007fbb927a2778 in dt_collection_new () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#10 0x00007fbb927c9525 in dt_init () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
#11 0x000055757a9270bc in ?? ()
#12 0x00007fbb924ec083 in __libc_start_main (main=0x55757a9270a0, argc=1, argv=0x7fffe26cb178, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7fffe26cb168) at ../csu/libc-start.c:308
#13 0x000055757a92712e in ?? ()

=========

  Id   Target Id                                        Frame 
* 1    Thread 0x7fbb8b7dd100 (LWP 2453) "darktable"     0x00007fbb925aac7f in __GI___wait4 (pid=2464, stat_loc=0x0, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:27
  2    Thread 0x7fbb8b25b700 (LWP 2454) "gmain"         0x00007fbb925da99f in __GI___poll (fds=0x55757be60fe0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
  3    Thread 0x7fbb8aa5a700 (LWP 2455) "pool"          syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  4    Thread 0x7fbb8a259700 (LWP 2456) "gdbus"         0x00007fbb925da99f in __GI___poll (fds=0x55757be338e0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
  5    Thread 0x7fbb896da700 (LWP 2457) "worker 0"      futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
  6    Thread 0x7fbb88ed9700 (LWP 2458) "worker 1"      futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
  7    Thread 0x7fbb7bfff700 (LWP 2459) "kicker"        0x00007fbb925a523f in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7fbb7bff04e0, rem=rem@entry=0x7fbb7bff04e0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
  8    Thread 0x7fbb7b7fe700 (LWP 2460) "worker res 0"  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
  9    Thread 0x7fbb7affd700 (LWP 2461) "worker res 1"  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
  10   Thread 0x7fbb7a7fc700 (LWP 2462) "worker res 2"  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
  11   Thread 0x7fbb79ffb700 (LWP 2463) "gphoto_update" 0x00007fbb925a523f in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=0x7fbb79fec460, rem=0x7fbb79fec470) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78

=========

Thread 11 (Thread 0x7fbb79ffb700 (LWP 2463)):
#0  0x00007fbb925a523f in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=0x7fbb79fec460, rem=0x7fbb79fec470) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
        sc_cancel_oldtype = 0
        sc_ret = <optimised out>
        r = <optimised out>
#1  0x00007fbb925aaec7 in __GI___nanosleep (requested_time=<optimised out>, remaining=<optimised out>) at nanosleep.c:27
        ret = <optimised out>
#2  0x00007fbb92268547 in g_usleep () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fbb92a6419a in dt_update_cameras_thread () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#4  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443182413568, -6614102625678707510, 140736992144926, 140736992144927, 140736992145072, 140443182351872, 6576116691173979338, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#5  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 10 (Thread 0x7fbb7a7fc700 (LWP 2462)):
#0  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
        __ret = -512
        oldtype = 1
        err = <optimised out>
        oldtype = <optimised out>
        err = <optimised out>
        __ret = <optimised out>
        resultvar = <optimised out>
        __arg4 = <optimised out>
        __arg3 = <optimised out>
        __arg2 = <optimised out>
        __arg1 = <optimised out>
        _a4 = <optimised out>
        _a3 = <optimised out>
        _a2 = <optimised out>
        _a1 = <optimised out>
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55757be5ba30, cond=0x55757be5ba80) at pthread_cond_wait.c:508
        spin = 0
        buffer = {__routine = 0x7fbb924b4050 <__condvar_cleanup_waiting>, __arg = 0x7fbb7a7ed430, __canceltype = 208, __prev = 0x0}
        cbuffer = {wseq = 8, cond = 0x55757be5ba80, mutex = 0x55757be5ba30, private = 0}
        err = <optimised out>
        g = 0
        flags = <optimised out>
        g1_start = <optimised out>
        signals = <optimised out>
        result = 0
        wseq = 8
        seq = 4
        private = <optimised out>
        maxspin = <optimised out>
        err = <optimised out>
        result = <optimised out>
        wseq = <optimised out>
        g = <optimised out>
        seq = <optimised out>
        flags = <optimised out>
        private = <optimised out>
        signals = <optimised out>
        g1_start = <optimised out>
        spin = <optimised out>
        buffer = <optimised out>
        cbuffer = <optimised out>
        s = <optimised out>
#2  __pthread_cond_wait (cond=0x55757be5ba80, mutex=0x55757be5ba30) at pthread_cond_wait.c:647
No locals.
#3  0x00007fbb928a9d0c in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#4  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443190806272, -6614102625678707510, 140736992144878, 140736992144879, 140736992145024, 140443190744576, 6576108994055713994, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#5  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 9 (Thread 0x7fbb7affd700 (LWP 2461)):
#0  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
        __ret = -512
        oldtype = 1
        err = <optimised out>
        oldtype = <optimised out>
        err = <optimised out>
        __ret = <optimised out>
        resultvar = <optimised out>
        __arg4 = <optimised out>
        __arg3 = <optimised out>
        __arg2 = <optimised out>
        __arg1 = <optimised out>
        _a4 = <optimised out>
        _a3 = <optimised out>
        _a2 = <optimised out>
        _a1 = <optimised out>
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55757be5ba30, cond=0x55757be5ba80) at pthread_cond_wait.c:508
        spin = 0
        buffer = {__routine = 0x7fbb924b4050 <__condvar_cleanup_waiting>, __arg = 0x7fbb7afee430, __canceltype = 208, __prev = 0x0}
        cbuffer = {wseq = 6, cond = 0x55757be5ba80, mutex = 0x55757be5ba30, private = 0}
        err = <optimised out>
        g = 0
        flags = <optimised out>
        g1_start = <optimised out>
        signals = <optimised out>
        result = 0
        wseq = 6
        seq = 3
        private = <optimised out>
        maxspin = <optimised out>
        err = <optimised out>
        result = <optimised out>
        wseq = <optimised out>
        g = <optimised out>
        seq = <optimised out>
        flags = <optimised out>
        private = <optimised out>
        signals = <optimised out>
        g1_start = <optimised out>
        spin = <optimised out>
        buffer = <optimised out>
        cbuffer = <optimised out>
        s = <optimised out>
#2  __pthread_cond_wait (cond=0x55757be5ba80, mutex=0x55757be5ba30) at pthread_cond_wait.c:647
No locals.
#3  0x00007fbb928a9d0c in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#4  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443199198976, -6614102625678707510, 140736992144878, 140736992144879, 140736992145024, 140443199137280, 6576110093030470858, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#5  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 8 (Thread 0x7fbb7b7fe700 (LWP 2460)):
#0  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
        __ret = -512
        oldtype = 1
        err = <optimised out>
        oldtype = <optimised out>
        err = <optimised out>
        __ret = <optimised out>
        resultvar = <optimised out>
        __arg4 = <optimised out>
        __arg3 = <optimised out>
        __arg2 = <optimised out>
        __arg1 = <optimised out>
        _a4 = <optimised out>
        _a3 = <optimised out>
        _a2 = <optimised out>
        _a1 = <optimised out>
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55757be5ba30, cond=0x55757be5ba80) at pthread_cond_wait.c:508
        spin = 0
        buffer = {__routine = 0x7fbb924b4050 <__condvar_cleanup_waiting>, __arg = 0x7fbb7b7ef430, __canceltype = 0, __prev = 0x0}
        cbuffer = {wseq = 4, cond = 0x55757be5ba80, mutex = 0x55757be5ba30, private = 0}
        err = <optimised out>
        g = 0
        flags = <optimised out>
        g1_start = <optimised out>
        signals = <optimised out>
        result = 0
        wseq = 4
        seq = 2
        private = <optimised out>
        maxspin = <optimised out>
        err = <optimised out>
        result = <optimised out>
        wseq = <optimised out>
        g = <optimised out>
        seq = <optimised out>
        flags = <optimised out>
        private = <optimised out>
        signals = <optimised out>
        g1_start = <optimised out>
        spin = <optimised out>
        buffer = <optimised out>
        cbuffer = <optimised out>
        s = <optimised out>
#2  __pthread_cond_wait (cond=0x55757be5ba80, mutex=0x55757be5ba30) at pthread_cond_wait.c:647
No locals.
#3  0x00007fbb928a9d0c in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#4  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443207591680, -6614102625678707510, 140736992144878, 140736992144879, 140736992145024, 140443207529984, 6576111192005227722, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#5  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 7 (Thread 0x7fbb7bfff700 (LWP 2459)):
#0  0x00007fbb925a523f in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7fbb7bff04e0, rem=rem@entry=0x7fbb7bff04e0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
        sc_cancel_oldtype = 0
        sc_ret = <optimised out>
        r = <optimised out>
#1  0x00007fbb925aaec7 in __GI___nanosleep (requested_time=requested_time@entry=0x7fbb7bff04e0, remaining=remaining@entry=0x7fbb7bff04e0) at nanosleep.c:27
        ret = <optimised out>
#2  0x00007fbb925aadfe in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
        save_errno = 0
        ts = {tv_sec = 1, tv_nsec = 808054919}
#3  0x00007fbb928a98c2 in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#4  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443215984384, -6614102625678707510, 140736992144878, 140736992144879, 140736992145024, 140443215922688, 6576112295274951882, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#5  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 6 (Thread 0x7fbb88ed9700 (LWP 2458)):
#0  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
        __ret = -512
        oldtype = 0
        err = <optimised out>
        oldtype = <optimised out>
        err = <optimised out>
        __ret = <optimised out>
        resultvar = <optimised out>
        __arg4 = <optimised out>
        __arg3 = <optimised out>
        __arg2 = <optimised out>
        __arg1 = <optimised out>
        _a4 = <optimised out>
        _a3 = <optimised out>
        _a2 = <optimised out>
        _a1 = <optimised out>
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55757be5ba30, cond=0x55757be5ba80) at pthread_cond_wait.c:508
        spin = 0
        buffer = {__routine = 0x7fbb924b4050 <__condvar_cleanup_waiting>, __arg = 0x7fbb88eca480, __canceltype = 0, __prev = 0x0}
        cbuffer = {wseq = 0, cond = 0x55757be5ba80, mutex = 0x55757be5ba30, private = 0}
        err = <optimised out>
        g = 0
        flags = <optimised out>
        g1_start = <optimised out>
        signals = <optimised out>
        result = 0
        wseq = 0
        seq = 0
        private = <optimised out>
        maxspin = <optimised out>
        err = <optimised out>
        result = <optimised out>
        wseq = <optimised out>
        g = <optimised out>
        seq = <optimised out>
        flags = <optimised out>
        private = <optimised out>
        signals = <optimised out>
        g1_start = <optimised out>
        spin = <optimised out>
        buffer = <optimised out>
        cbuffer = <optimised out>
        s = <optimised out>
#2  __pthread_cond_wait (cond=0x55757be5ba80, mutex=0x55757be5ba30) at pthread_cond_wait.c:647
No locals.
#3  0x00007fbb928aafb6 in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#4  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443432883968, -6614102625678707510, 140736992144878, 140736992144879, 140736992145024, 140443432822272, 6576079459176232138, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#5  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 5 (Thread 0x7fbb896da700 (LWP 2457)):
#0  futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x55757be5baa8) at ../sysdeps/nptl/futex-internal.h:183
        __ret = -512
        oldtype = 0
        err = <optimised out>
        oldtype = <optimised out>
        err = <optimised out>
        __ret = <optimised out>
        resultvar = <optimised out>
        __arg4 = <optimised out>
        __arg3 = <optimised out>
        __arg2 = <optimised out>
        __arg1 = <optimised out>
        _a4 = <optimised out>
        _a3 = <optimised out>
        _a2 = <optimised out>
        _a1 = <optimised out>
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55757be5ba30, cond=0x55757be5ba80) at pthread_cond_wait.c:508
        spin = 0
        buffer = {__routine = 0x7fbb924b4050 <__condvar_cleanup_waiting>, __arg = 0x7fbb896cb480, __canceltype = 208, __prev = 0x0}
        cbuffer = {wseq = 2, cond = 0x55757be5ba80, mutex = 0x55757be5ba30, private = 0}
        err = <optimised out>
        g = 0
        flags = <optimised out>
        g1_start = <optimised out>
        signals = <optimised out>
        result = 0
        wseq = 2
        seq = 1
        private = <optimised out>
        maxspin = <optimised out>
        err = <optimised out>
        result = <optimised out>
        wseq = <optimised out>
        g = <optimised out>
        seq = <optimised out>
        flags = <optimised out>
        private = <optimised out>
        signals = <optimised out>
        g1_start = <optimised out>
        spin = <optimised out>
        buffer = <optimised out>
        cbuffer = <optimised out>
        s = <optimised out>
#2  __pthread_cond_wait (cond=0x55757be5ba80, mutex=0x55757be5ba30) at pthread_cond_wait.c:647
No locals.
#3  0x00007fbb928aafb6 in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#4  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443441276672, -6614102625678707510, 140736992144878, 140736992144879, 140736992145024, 140443441214976, 6576080558150989002, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#5  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 4 (Thread 0x7fbb8a259700 (LWP 2456)):
#0  0x00007fbb925da99f in __GI___poll (fds=0x55757be338e0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
        sc_ret = <optimised out>
#1  0x00007fbb9223d36e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fbb9223d6f3 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fbb916c2f8a in ?? () from /lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#4  0x00007fbb92266ad1 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443453331200, -6614102625678707510, 140736992144654, 140736992144655, 140736992144800, 140443453269504, 6576074580093383882, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#6  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 3 (Thread 0x7fbb8aa5a700 (LWP 2455)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x00007fbb9228a746 in g_cond_wait_until () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fbb9220d581 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fbb922674ca in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007fbb92266ad1 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443461723904, -6614102625678707510, 140736992144494, 140736992144495, 140736992144640, 140443461662208, 6576075679068140746, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#6  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 2 (Thread 0x7fbb8b25b700 (LWP 2454)):
#0  0x00007fbb925da99f in __GI___poll (fds=0x55757be60fe0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
        sc_ret = <optimised out>
#1  0x00007fbb9223d36e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fbb9223d4a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fbb9223d4f1 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007fbb92266ad1 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fbb924ad609 in start_thread (arg=<optimised out>) at pthread_create.c:477
        ret = <optimised out>
        pd = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140443470116608, -6614102625678707510, 140736992144110, 140736992144111, 140736992144256, 140443470054912, 6576076782337864906, 6576056045701117130}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#6  0x00007fbb925e7133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.

Thread 1 (Thread 0x7fbb8b7dd100 (LWP 2453)):
#0  0x00007fbb925aac7f in __GI___wait4 (pid=2464, stat_loc=0x0, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:27
        resultvar = 18446744073709551104
        sc_cancel_oldtype = 0
        sc_ret = <optimised out>
#1  0x00007fbb928966b0 in ?? () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#2  <signal handler called>
No locals.
#3  __GI___pthread_mutex_lock (mutex=0x0) at ../nptl/pthread_mutex_lock.c:67
        type = <optimised out>
        __PRETTY_FUNCTION__ = "__pthread_mutex_lock"
        id = <optimised out>
#4  0x00007fbb9279b8f0 in dt_cache_get_with_caller () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#5  0x00007fbb92822cf1 in dt_image_cache_get () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#6  0x00007fbb9281bc6c in dt_image_set_raw_aspect_ratio () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#7  0x00007fbb927a0bd3 in dt_collection_update () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#8  0x00007fbb927a2107 in dt_collection_update_query () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#9  0x00007fbb927a2778 in dt_collection_new () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#10 0x00007fbb927c9525 in dt_init () from /usr/bin/../lib/x86_64-linux-gnu/darktable/libdarktable.so
No symbol table info available.
#11 0x000055757a9270bc in ?? ()
No symbol table info available.
#12 0x00007fbb924ec083 in __libc_start_main (main=0x55757a9270a0, argc=1, argv=0x7fffe26cb178, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7fffe26cb168) at ../csu/libc-start.c:308
        self = <optimised out>
        result = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {93963055952368, -6614102625678707510, 93963055952128, 140736992162160, 0, 0, 6614161043974337738, 6576056080682398922}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x1, 0x7fffe26cb178}, data = {prev = 0x0, cleanup = 0x0, canceltype = 1}}}
        not_first_call = <optimised out>
#13 0x000055757a92712e in ?? ()
No symbol table info available.
[Inferior 1 (process 2453) detached]