this is darktable 1.7.0+1594~g440257b reporting a segfault:

#0  malloc_consolidate (av=av@entry=0x7fb26d7eac00 <main_arena>) at malloc.c:4150
#1  0x00007fb26d4a7a34 in _int_malloc (av=av@entry=0x7fb26d7eac00 <main_arena>, bytes=bytes@entry=65536) at malloc.c:3417
#2  0x00007fb26d4ab0b5 in __libc_calloc (n=<optimized out>, elem_size=<optimized out>) at malloc.c:3213
#3  0x00007fb26b1e87f2 in g_malloc0 () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb26b1d0d88 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb26b1d1297 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fb26b4d0876 in g_signal_handlers_destroy () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x00007fb26b4bca4d in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007fb26b4bec28 in g_object_run_dispose () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#10 0x00007fb26cca4530 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#11 0x00007fb26b4b822f in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007fb26b4ca436 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007fb26b4d2698 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007fb26ce8d498 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#16 0x00007fb26b4bec28 in g_object_run_dispose () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#17 0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#18 0x00007fb26cca4530 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#19 0x00007fb26b4b822f in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#20 0x00007fb26b4ca436 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007fb26b4d2698 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#22 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#23 0x00007fb26ce8d498 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#24 0x00007fb26b4bec28 in g_object_run_dispose () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#26 0x00007fb26cca4530 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#27 0x00007fb26b4b82d5 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#28 0x00007fb26b4ca436 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#29 0x00007fb26b4d2698 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#30 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#31 0x00007fb26ce8d498 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#32 0x00007fb26b4bd225 in g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#33 0x00007fb26cca2980 in gtk_container_remove () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#34 0x00007fb26dba0951 in _remove_child (child=0x36aed60, container=<optimized out>) at /home/tom/src/darktable/src/views/view.c:221
#35 0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#36 0x00007fb26dba1799 in dt_view_manager_switch (vm=<optimized out>, k=k@entry=0) at /home/tom/src/darktable/src/views/view.c:331
#37 0x00007fb26daed111 in _dt_ctl_switch_mode_to (user_data=0x0) at /home/tom/src/darktable/src/control/control.c:647
#38 0x00007fb26b1e3be5 in g_main_context_invoke_full () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007fb26db77641 in button_pressed (w=0x1fbd590, event=0x2c41bb0, user_data=<optimized out>) at /home/tom/src/darktable/src/gui/gtk.c:656
#40 0x00007fb26cd5050d in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#41 0x00007fb26b4b82d5 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#42 0x00007fb26b4ca03c in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#43 0x00007fb26b4d21a5 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#44 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#45 0x00007fb26ce818c4 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#46 0x00007fb26cd4df1e in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#47 0x00007fb26cd4fb2e in gtk_main_do_event () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#48 0x00007fb26c8ecb42 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#49 0x00007fb26b1e2c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#50 0x00007fb26b1e2f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#51 0x00007fb26b1e3242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#52 0x00007fb26cd4ede5 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#53 0x00007fb26db79c5c in dt_gui_gtk_run (gui=<optimized out>) at /home/tom/src/darktable/src/gui/gtk.c:964
#54 0x000000000040082a in main (argc=<optimized out>, argv=<optimized out>) at /home/tom/src/darktable/src/main.c:25

Thread 15 (Thread 0x7fb25e8e7700 (LWP 8439)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fb26daf2a0e in dt_control_work (ptr=<optimized out>) at /home/tom/src/darktable/src/control/jobs.c:476
        params = <optimized out>
        control = 0x1ac03a0
#2  0x00007fb26d7f76aa in start_thread (arg=0x7fb25e8e7700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb25e8e7700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140404067301120, 5913060351793351848, 0, 140733663478111, 140404067301824, 27764496, -5950429302618665816, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 14 (Thread 0x7fb25e0e6700 (LWP 8440)):
#0  0x00007fb268cafbcf in DispatchImage () from /usr/lib/libGraphicsMagick.so.3
No symbol table info available.
#1  0x00007fb26dac09ee in dt_imageio_large_thumbnail (filename=<optimized out>, buffer=0x7fb25e0e44f0, width=0x7fb25e0e44b0, height=<optimized out>) at /home/tom/src/darktable/src/common/imageio.c:127
        bufprt = <optimized out>
        gm_ret = <optimized out>
        row = 843
        exception = {severity = UndefinedException, reason = 0x0, description = 0x0, error_number = 0, module = 0x0, function = 0x0, line = 0, signature = 2880220587}
        image = 0x7fb25006f760
        image_info = 0x7fb25000a460
        res = 1
        buf = 0x7fb222b26010 "II*"
        mime_type = 0x7fb25000a440 "image/tiff"
        bufsize = 1312572
#2  0x00007fb26dad4443 in _init_8 (size=<optimized out>, imgid=<optimized out>, height=<optimized out>, width=<optimized out>, buf=<optimized out>) at /home/tom/src/darktable/src/common/mipmap_cache.c:963
        tmp = 0x7fb1f55ea010 "\n\a\016"
        thumb_width = 4288
        thumb_height = 2848
        from_cache = 0
        c = 0x7fb268e349f4 "\374\263\347\377\354\263\347\377̳\347\377\254\263\347\377L\263\347\377\034\264\347\377a\267\347\377a\267\347\377\272\266\347\377i\266\347\377!\266\347\377\250\265\347\377$\267\347\377g\272\347\377\005\273\347\377\265\273\347\377\265\273\347\377\367\270\347\377ǹ\347\377\001"
        altered = 2115
        cimg = 0xffffffffffe7b4f8
        filename = "/media/scratch/backup/K10D/fotos-k10/2015/Terschelling 2015/105_0512/IMGP1248.DNG", '\000' <repeats 4014 times>
        from_cache = 0
#3  dt_mipmap_cache_get_with_caller (cache=0x1f5c5d0, buf=0x7fb25e0e5b60, imgid=1109, mip=DT_MIPMAP_0, flags=2115, flags@entry=DT_MIPMAP_BLOCKING, mode=-16 '\360', mode@entry=114 'r', file=0x7fb25e0e35d4 "\001", line=36) at /home/tom/src/darktable/src/common/mipmap_cache.c:651
        entry = 0x34b
        dsc = 0x7fb25007a8c0
#4  0x00007fb26daf8b72 in dt_image_load_job_run (job=<optimized out>) at /home/tom/src/darktable/src/control/jobs/image_jobs.c:36
        params = 0x3e7e9e0
        buf = {size = DT_MIPMAP_0, imgid = 255, width = 16711680, height = 0, buf = 0x4040404040404040 <error: Cannot access memory at address 0x4040404040404040>, cache_entry = 0x21dc9e0}
#5  0x00007fb26daf28c5 in dt_control_run_job (control=0x1ac03a0) at /home/tom/src/darktable/src/control/jobs.c:274
No locals.
#6  dt_control_work (ptr=<optimized out>) at /home/tom/src/darktable/src/control/jobs.c:472
        params = <optimized out>
        control = 0x1ac03a0
#7  0x00007fb26d7f76aa in start_thread (arg=0x7fb25e0e6700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb25e0e6700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140404058908416, 5913060351793351848, 0, 140733663478111, 140404058909120, 27764496, -5950428204717650776, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#8  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 13 (Thread 0x7fb25d8e5700 (LWP 8441)):
#0  0x00007fb268ce708a in ?? () from /usr/lib/libGraphicsMagick.so.3
No symbol table info available.
#1  0x00007fb268ceb166 in ImportViewPixelArea () from /usr/lib/libGraphicsMagick.so.3
No symbol table info available.
#2  0x00007fb268e22e0f in ?? () from /usr/lib/libGraphicsMagick.so.3
No symbol table info available.
#3  0x00007fb268cb09b0 in ReadImage () from /usr/lib/libGraphicsMagick.so.3
No symbol table info available.
#4  0x00007fb268c6a1b5 in BlobToImage () from /usr/lib/libGraphicsMagick.so.3
No symbol table info available.
#5  0x00007fb26dac0945 in dt_imageio_large_thumbnail (filename=<optimized out>, buffer=0x7fb25d8e34f0, width=0x7fb25d8e34b0, height=0x7fb25d8e34d0) at /home/tom/src/darktable/src/common/imageio.c:108
        exception = {severity = UndefinedException, reason = 0x0, description = 0x0, error_number = 0, module = 0x0, function = 0x0, line = 0, signature = 2880220587}
        image = 0x0
        image_info = 0x7fb2480f0f00
        res = 1
        buf = 0x7fb245e5f010 "II*"
        mime_type = 0x7fb248008b60 "image/tiff"
        bufsize = 1268334
#6  0x00007fb26dad4443 in _init_8 (size=<optimized out>, imgid=<optimized out>, height=<optimized out>, width=<optimized out>, buf=<optimized out>) at /home/tom/src/darktable/src/common/mipmap_cache.c:963
        tmp = 0x0
        thumb_width = 4288
        thumb_height = 2848
        from_cache = 0
        c = 0x0
        altered = 1
        cimg = 0xa0a
        filename = "/media/scratch/backup/K10D/fotos-k10/2015/Terschelling 2015/105_0512/IMGP1247.DNG", '\000' <repeats 4014 times>
        from_cache = 0
#7  dt_mipmap_cache_get_with_caller (cache=0x1f5c5d0, buf=0x7fb25d8e4b60, imgid=1108, mip=DT_MIPMAP_0, flags=DT_MIPMAP_PREFETCH, flags@entry=DT_MIPMAP_BLOCKING, mode=1 '\001', mode@entry=114 'r', file=0x7fb207646410 "\t\b\030\t\b\030\b\a\027\b\a\027\b\a\027\n\t\031\f\v\033\r\f\034\v\n\032\n\t\031\n\t\031\n\t\031\n\t\031\t\b\030\t\b\030\t\b\030\b\a\025\f\v\031\017\016\034\016\r\033\n\t\027\t\b\026\v\n\030\017\016\034\b\a\025\b\a\025\a\006\024\a\006\024\a\006\024\b\a\025\t\b\026\t\b\026\n\n\026\v\v\027\f\f\030\v\v\027\t\t\025\b\b\024\b\b\024\t\t\025\006\006\022\006\006\022\t\t\025\f\f\030\n\n\026\006\006\022\b\b\024\r\r\031\f\f\030\b\b\024\a\a\023\f\f\030\020\020\034\016\016\032\f\f\030\f\f\030\017\017\033\r\r\031\v\v\027\n\n\026\t\t\025\t\t\025\t\t\025\n\n\026\f\v\031\r\f\032\r\f"..., line=36) at /home/tom/src/darktable/src/common/mipmap_cache.c:651
        entry = 0x7
        dsc = 0x7fb2481df320
#8  0x00007fb26daf8b72 in dt_image_load_job_run (job=<optimized out>) at /home/tom/src/darktable/src/control/jobs/image_jobs.c:36
        params = 0x3e88d70
        buf = {size = 4278845190, imgid = 4279107340, width = -16711936, height = -16711936, buf = 0xff0eff0dff0bff08 <error: Cannot access memory at address 0xff0eff0dff0bff08>, cache_entry = 0x7fb248085180}
#9  0x00007fb26daf28c5 in dt_control_run_job (control=0x1ac03a0) at /home/tom/src/darktable/src/control/jobs.c:274
No locals.
#10 dt_control_work (ptr=<optimized out>) at /home/tom/src/darktable/src/control/jobs.c:472
        params = <optimized out>
        control = 0x1ac03a0
#11 0x00007fb26d7f76aa in start_thread (arg=0x7fb25d8e5700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb25d8e5700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140404050515712, 5913060351793351848, 0, 140733663478111, 140404050516416, 27764496, -5950431502715663192, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#12 0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 12 (Thread 0x7fb2550e4700 (LWP 8442)):
#0  0x00007fb26d4f0c4d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fb26d4f0ae4 in __sleep (seconds=0, seconds@entry=2) at ../sysdeps/unix/sysv/linux/sleep.c:138
        ts = {tv_sec = 1, tv_nsec = 509886643}
        set = {__val = {65536, 0 <repeats 15 times>}}
        oset = {__val = {0, 0, 0, 0, 0, 0, 0, 0, 0, 140404325076472, 0, 140733663478111, 140403907905984, 27764496, 0, 140404325177757}}
        result = <optimized out>
#2  0x00007fb26daf1a42 in dt_control_worker_kicker (ptr=0x1ac03a0) at /home/tom/src/darktable/src/control/jobs.c:451
        control = 0x1ac03a0
#3  0x00007fb26d7f76aa in start_thread (arg=0x7fb2550e4700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb2550e4700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140403907905280, 5913060351793351848, 0, 140733663478111, 140403907905984, 27764496, -5950447992705725272, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#4  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 11 (Thread 0x7fb25d0e4700 (LWP 8443)):
#0  0x00007fb26d8008ab in __waitpid (pid=pid@entry=8473, stat_loc=stat_loc@entry=0x0, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:40
        resultvar = 18446744073709551104
        oldtype = 0
        result = <optimized out>
#1  0x00007fb26da8a460 in _dt_sigsegv_handler (param=11) at /home/tom/src/darktable/src/common/darktable.c:185
        pid = 8473
        name_used = 0x7fb2400029b0 "/tmp/darktable_bt_9DKM0X.txt"
        fout = <optimized out>
        delete_file = 0
        datadir = "/home/tom/opt/darktable/share/darktable", '\000' <repeats 4056 times>
        pid_arg = 0x7fb2400029e0 "8438"
        comm_arg = 0x7fb240001250 "/home/tom/opt/darktable/share/darktable/gdb_commands"
        log_arg = 0x7fb240001330 "set logging on /tmp/darktable_bt_9DKM0X.txt"
#2  <signal handler called>
No locals.
#3  init_pipe (self=<optimized out>, pipe=<optimized out>, piece=<optimized out>) at /home/tom/src/darktable/src/iop/lowlight.c:260
        d = 0x7fb254497010
        default_params = 0x0
#4  0x00007fb26db04a93 in dt_iop_init_pipe (module=0x2cb2b50, pipe=0x222b960, piece=0x7fb2400028f0) at /home/tom/src/darktable/src/develop/imageop.c:453
No locals.
#5  0x00007fb26db136e3 in dt_dev_pixelpipe_create_nodes (pipe=0x222b960, dev=<optimized out>) at /home/tom/src/darktable/src/develop/pixelpipe_hb.c:224
        piece = 0x7fb2400028f0
        module = 0x2cb2b50
        __func__ = "dt_dev_pixelpipe_create_nodes"
        modules = 0x20aaec0
#6  0x00007fb26dafe7f5 in dt_dev_process_image_job (dev=0x222b250) at /home/tom/src/darktable/src/develop/develop.c:304
        buf = {size = DT_MIPMAP_FULL, imgid = 1110, width = 4352, height = 2868, buf = 0x7fb212831060 "\253", cache_entry = 0x2995cc0}
        start = {clock = 144267728,10569, user = 5,7599999999999998}
        zoom = 286
        zoom_x = 6,40546887e+17
        zoom_y = 4,58084468e-41
        scale = 3,57331108e-43
        window_width = 1073741856
        window_height = 1073820256
        x = 286
        y = 1073741856
        closeup = 1
        pipe_changed = (unknown: 1841707376)
#7  0x00007fb26daf8951 in dt_dev_process_image_job_run (job=<optimized out>) at /home/tom/src/darktable/src/control/jobs/develop_jobs.c:40
        dev = <optimized out>
#8  0x00007fb26daf1f13 in dt_control_run_job_res (res=0, control=0x1ac03a0) at /home/tom/src/darktable/src/control/jobs.c:186
        job = 0x2c427f0
#9  dt_control_work_res (ptr=<optimized out>) at /home/tom/src/darktable/src/control/jobs.c:432
        params = <optimized out>
        s = 0x1ac03a0
#10 0x00007fb26d7f76aa in start_thread (arg=0x7fb25d0e4700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb25d0e4700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140404042123008, 5913060351793351848, 0, 140733663478111, 140404042123712, 27764496, -5950430400519680856, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#11 0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 10 (Thread 0x7fb25c8e3700 (LWP 8444)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fb26daf1e26 in dt_control_work_res (ptr=<optimized out>) at /home/tom/src/darktable/src/control/jobs.c:438
        old = 0
        params = <optimized out>
        s = 0x1ac03a0
#2  0x00007fb26d7f76aa in start_thread (arg=0x7fb25c8e3700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb25c8e3700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140404033730304, 5913060351793351848, 0, 140733663478111, 140404033731008, 27764496, -5950433698517693272, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 9 (Thread 0x7fb2575bb700 (LWP 8445)):
#0  0x00007fb26d5218dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fb26b1e2ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fb26b1e2fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fb2575c327d in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
No symbol table info available.
#4  0x00007fb26b209955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fb26d7f76aa in start_thread (arg=0x7fb2575bb700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb2575bb700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140403946534656, 5913060351793351848, 0, 140733663462127, 140403946535360, 33311584, -5950442885452739416, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 8 (Thread 0x7fb256dba700 (LWP 8446)):
#0  0x00007fb26d5218dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fb26b1e2ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fb26b1e3242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fb26b7d9ae6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#4  0x00007fb26b209955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fb26d7f76aa in start_thread (arg=0x7fb256dba700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb256dba700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140403938141952, 5913060351793351848, 0, 140403946530943, 140403938142656, 140403420502912, -5950446185598235480, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 7 (Thread 0x7fb22ee19700 (LWP 8451)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x00007fb26b227a0a in g_cond_wait_until () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fb26b1b7889 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fb26b1b7eab in g_async_queue_timeout_pop () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007fb26b20a3ac in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fb26b209955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#6  0x00007fb26d7f76aa in start_thread (arg=0x7fb22ee19700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb22ee19700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140403267442432, 5913060351793351848, 0, 140403938137919, 8388608, 140403823117232, -5950604428836418392, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 6 (Thread 0x7fb22f61a700 (LWP 8452)):
#0  0x00007fb26d5218dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fb26b1e2ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fb26b1e2fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fb26b1e3009 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007fb26b209955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fb26d7f76aa in start_thread (arg=0x7fb22f61a700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb22f61a700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140403275835136, 5913060351793351848, 0, 140733663469007, 8388608, 140403823115792, -5950601130838405976, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 5 (Thread 0x7fb219236700 (LWP 8465)):
#0  0x00007fb2681a42de in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#1  0x00007fb2681a1bf0 in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#2  0x00007fb26d7f76aa in start_thread (arg=0x7fb219236700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb219236700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140402902656768, 5913060351793351848, 0, 140404067212095, 8388608, 140403957512976, -5950562113208005464, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 4 (Thread 0x7fb211061700 (LWP 8466)):
#0  0x00007fb2681a42de in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#1  0x00007fb2681a1bf0 in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#2  0x00007fb26d7f76aa in start_thread (arg=0x7fb211061700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb211061700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140402766518016, 5913060351793351848, 0, 140404058819391, 8388608, 140403823120400, -5950580003357406040, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 3 (Thread 0x7fb224cd1700 (LWP 8469)):
#0  0x00007fb2681a42de in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#1  0x00007fb2681a1bf0 in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#2  0x00007fb26d7f76aa in start_thread (arg=0x7fb224cd1700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb224cd1700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140403098326784, 5913060351793351848, 0, 140404050506015, 8388608, 140403957324224, -5950626655292175192, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 2 (Thread 0x7fb222075700 (LWP 8472)):
#0  0x00007fb2681a42de in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#1  0x00007fb2681a1bf0 in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
No symbol table info available.
#2  0x00007fb26d7f76aa in start_thread (arg=0x7fb222075700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fb222075700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140403051812608, 5913060351793351848, 0, 140404042118863, 8388608, 140403823106448, -5950612999443657560, -5950464633884324696}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007fb26d52ceed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.

Thread 1 (Thread 0x7fb26e091a40 (LWP 8438)):
#0  malloc_consolidate (av=av@entry=0x7fb26d7eac00 <main_arena>) at malloc.c:4150
        fb = 0x7fb26d7eac08 <main_arena+8>
        maxfb = 0x7fb26d7eac50 <main_arena+80>
        p = 0x335ef90
        nextp = <optimized out>
        unsorted_bin = 0x7fb26d7eac58 <main_arena+88>
        first_unsorted = <optimized out>
        nextchunk = 0x335efb0
        size = 96
        nextsize = 64
        prevsize = <optimized out>
        nextinuse = 0
        bck = <optimized out>
        fwd = <optimized out>
#1  0x00007fb26d4a7a34 in _int_malloc (av=av@entry=0x7fb26d7eac00 <main_arena>, bytes=bytes@entry=65536) at malloc.c:3417
        nb = <optimized out>
        idx = 121
        bin = <optimized out>
        victim = <optimized out>
        size = <optimized out>
        victim_index = <optimized out>
        remainder = <optimized out>
        remainder_size = <optimized out>
        block = <optimized out>
        bit = <optimized out>
        map = <optimized out>
        fwd = <optimized out>
        bck = <optimized out>
        errstr = 0x0
        __func__ = "_int_malloc"
#2  0x00007fb26d4ab0b5 in __libc_calloc (n=<optimized out>, elem_size=<optimized out>) at malloc.c:3213
        av = 0x7fb26d7eac00 <main_arena>
        oldtop = 0x3e9d4b0
        p = <optimized out>
        bytes = 65536
        sz = 65536
        csz = <optimized out>
        oldtopsize = 133968
        mem = <optimized out>
        clearsize = <optimized out>
        nclears = <optimized out>
        d = <optimized out>
        hook = <optimized out>
        __func__ = "__libc_calloc"
#3  0x00007fb26b1e87f2 in g_malloc0 () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007fb26b1d0d88 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fb26b1d1297 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#6  0x00007fb26b4d0876 in g_signal_handlers_destroy () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#7  0x00007fb26b4bca4d in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#8  0x00007fb26b4bec28 in g_object_run_dispose () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#9  0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#10 0x00007fb26cca4530 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#11 0x00007fb26b4b822f in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#12 0x00007fb26b4ca436 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#13 0x00007fb26b4d2698 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#14 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#15 0x00007fb26ce8d498 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#16 0x00007fb26b4bec28 in g_object_run_dispose () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#17 0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#18 0x00007fb26cca4530 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#19 0x00007fb26b4b822f in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#20 0x00007fb26b4ca436 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#21 0x00007fb26b4d2698 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#22 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#23 0x00007fb26ce8d498 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#24 0x00007fb26b4bec28 in g_object_run_dispose () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#25 0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#26 0x00007fb26cca4530 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#27 0x00007fb26b4b82d5 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#28 0x00007fb26b4ca436 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#29 0x00007fb26b4d2698 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#30 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#31 0x00007fb26ce8d498 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#32 0x00007fb26b4bd225 in g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#33 0x00007fb26cca2980 in gtk_container_remove () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#34 0x00007fb26dba0951 in _remove_child (child=0x36aed60, container=<optimized out>) at /home/tom/src/darktable/src/views/view.c:221
        evb = 0x387e9b0
        container = <optimized out>
        child = 0x36aed60
#35 0x00007fb26cc5cb67 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#36 0x00007fb26dba1799 in dt_view_manager_switch (vm=<optimized out>, k=k@entry=0) at /home/tom/src/darktable/src/views/view.c:331
        l = 4
        plugins = <optimized out>
        v = 0x2234928
        endmarker = <optimized out>
        error = <optimized out>
        newv = <optimized out>
        nv = 0x2234800
#37 0x00007fb26daed111 in _dt_ctl_switch_mode_to (user_data=0x0) at /home/tom/src/darktable/src/control/control.c:647
        mode = DT_LIBRARY
        widget = <optimized out>
#38 0x00007fb26b1e3be5 in g_main_context_invoke_full () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#39 0x00007fb26db77641 in button_pressed (w=0x1fbd590, event=0x2c41bb0, user_data=<optimized out>) at /home/tom/src/darktable/src/gui/gtk.c:656
        pressure = 1
        device = <optimized out>
#40 0x00007fb26cd5050d in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#41 0x00007fb26b4b82d5 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#42 0x00007fb26b4ca03c in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#43 0x00007fb26b4d21a5 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#44 0x00007fb26b4d28ff in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#45 0x00007fb26ce818c4 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#46 0x00007fb26cd4df1e in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#47 0x00007fb26cd4fb2e in gtk_main_do_event () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#48 0x00007fb26c8ecb42 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
No symbol table info available.
#49 0x00007fb26b1e2c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#50 0x00007fb26b1e2f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#51 0x00007fb26b1e3242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#52 0x00007fb26cd4ede5 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#53 0x00007fb26db79c5c in dt_gui_gtk_run (gui=<optimized out>) at /home/tom/src/darktable/src/gui/gtk.c:964
        widget = <optimized out>
        allocation = {x = 360, y = 10, width = 180, height = 480}
#54 0x000000000040082a in main (argc=<optimized out>, argv=<optimized out>) at /home/tom/src/darktable/src/main.c:25
No locals.