Stripped an image of all but basic modules and started to use brush on 
an area.
Stopped the brush (finger up from mouse button), unable to restart.
  1.3+679~gc9e1476 .. 64 bit ... 8 Gb. Mem.

Unable also to determine how to turn brush mask off/on.

David


(gdb) bt
#0  0x00007ffff7a478da in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea065ea0, points_max=0x7fffea0661e0,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066220, rborder=0x7fffea066240, 
rpayload=0x7fffea066260,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:374
#1  0x00007ffff7a4781f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea066060, points_max=0x7fffea0661e0,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066220, rborder=0x7fffea066240, 
rpayload=0x7fffea066260,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:394
#2  0x00007ffff7a4781f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea0663e0, points_max=0x7fffea0661e0,
---Type <return> to continue, or q <return> to quit---
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066220, rborder=0x7fffea066240, 
rpayload=0x7fffea066260,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:394
#3  0x00007ffff7a4777f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea0663e0, points_max=0x7fffea066720,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066760, rborder=0x7fffea066780, 
rpayload=0x7fffea0667a0,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:393
#4  0x00007ffff7a4781f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea0665a0, points_max=0x7fffea066720,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066760, rborder=0x7fffea066780, 
rpayload=0x7fffea0667a0,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
---Type <return> to continue, or q <return> to quit---
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:394
#5  0x00007ffff7a4781f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea066920, points_max=0x7fffea066720,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066760, rborder=0x7fffea066780, 
rpayload=0x7fffea0667a0,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:394
#6  0x00007ffff7a4777f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea066920, points_max=0x7fffea066aa0,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066ae0, rborder=0x7fffea066b00, 
rpayload=0x7fffea066b20,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:393
---Type <return> to continue, or q <return> to quit---
#7  0x00007ffff7a4781f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea066e60, points_max=0x7fffea066aa0,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066ae0, rborder=0x7fffea066b00, 
rpayload=0x7fffea066b20,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:394
#8  0x00007ffff7a4777f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea066e60, points_max=0x7fffea066c60,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea066ca0, rborder=0x7fffea066cc0, 
rpayload=0x7fffea066ce0,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:393
#9  0x00007ffff7a4777f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea066e60, points_max=0x7fffea0671a0,
---Type <return> to continue, or q <return> to quit---
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea0671e0, rborder=0x7fffea067200, 
rpayload=0x7fffea067220,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:393
#10 0x00007ffff7a4781f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea067020, points_max=0x7fffea0671a0,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea0671e0, rborder=0x7fffea067200, 
rpayload=0x7fffea067220,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:394
#11 0x00007ffff7a4781f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea067580, points_max=0x7fffea0671a0,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea0671e0, rborder=0x7fffea067200, 
rpayload=0x7fffea067220,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
---Type <return> to continue, or q <return> to quit---
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:394
#12 0x00007ffff7a4777f in _brush_points_recurs (p1=0x7fffea0675c0,
     p2=0x7fffea0675e0, tmin=<optimized out>, tmax=<optimized out>,
     points_min=0x7fffea067580, points_max=0x7fffea0675a0,
     border_min=<optimized out>, border_max=<optimized out>,
     rpoints=0x7fffea0674e0, rborder=0x7fffea067500, 
rpayload=0x7fffea067520,
     points=0x7fff6945e010, border=0x7fff4695e010, payload=0x7fff44cf1010,
     pos_points=0x7fffea067480, pos_border=0x7fffea0674a0,
     pos_payload=0x7fffea0674c0, withborder=1, withpayload=1)
     at /home/david/darktable/src/develop/masks/brush.c:393
#13 0x00007ffff7a4f380 in _brush_get_points_border (dev=0x2e84720,
     form=form@entry=0x3a538c0, prio_max=368, pipe=0x2e84b60,
     points=points@entry=0x7fffea0678e0,
     points_count=points_count@entry=0x7fffea067880,
     border=border@entry=0x7fffea067900,
     border_count=border_count@entry=0x7fffea0678a0,
     payload=payload@entry=0x7fffea067920,
     payload_count=payload_count@entry=0x7fffea0678c0, source=0)
     at /home/david/darktable/src/develop/masks/brush.c:545
---Type <return> to continue, or q <return> to quit---
#14 0x00007ffff7a56fdb in dt_brush_get_mask_roi (buffer=0x7fffea067d80,
     roi=0x7fffea068660, form=0x3a538c0, module=0x2dd7c00,
     piece=<optimized out>)
     at /home/david/darktable/src/develop/masks/brush.c:2018
#15 dt_masks_get_mask_roi (module=module@entry=0x2dd7c00,
     piece=piece@entry=0x7fffd4007f50, form=0x3a538c0,
     roi=roi@entry=0x7fffea068660, buffer=buffer@entry=0x7fffea067d80)
     at /home/david/darktable/src/develop/masks/masks.c:327
#16 0x00007ffff7a56e62 in dt_group_get_mask_roi (buffer=0x7fffea0680c0,
     roi=0x7fffea068660, piece=0x7fffd4007f50, module=0x2dd7c00,
     form=<optimized out>)
     at /home/david/darktable/src/develop/masks/group.c:442
#17 dt_masks_get_mask_roi (module=module@entry=0x2dd7c00,
     piece=piece@entry=0x7fffd4007f50, form=0x0, form@entry=0x3a7d280,
     roi=roi@entry=0x7fffea068660, buffer=<optimized out>)
     at /home/david/darktable/src/develop/masks/masks.c:315
#18 0x00007ffff7a5a3d6 in dt_masks_group_render_roi (
     module=module@entry=0x2dd7c00, piece=piece@entry=0x7fffd4007f50,
     form=0x3a7d280, roi=roi@entry=0x7fffea068660,
     buffer=buffer@entry=0x7fffea0680c0)
     at /home/david/darktable/src/develop/masks/group.c:562
---Type <return> to continue, or q <return> to quit---
#19 0x00007ffff7a326c6 in dt_develop_blend_process 
(self=self@entry=0x2dd7c00,
     piece=piece@entry=0x7fffd4007f50, i=0x7fff2778a010, o=0x7ffed06c0010,
     roi_in=roi_in@entry=0x7fffea0683a0, 
roi_out=roi_out@entry=0x7fffea068660)
     at /home/david/darktable/src/develop/blend.c:1861
#20 0x00007ffff7a26ea1 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60, out_bpp=0x2e84c30,
     out_bpp@entry=0x7fffea06ba20, roi_out=roi_out@entry=0x7fffea068660,
     modules=0x2db09a0, pieces=0x377eae0, pos=pos@entry=20)
     at /home/david/darktable/src/develop/pixelpipe_hb.c:1464
#21 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea068920, modules=0x2dc5a80, 
pieces=0x391e320,
     pos=pos@entry=21) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#22 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea068be0, modules=0x2dba100, 
pieces=0x3902900,
     pos=pos@entry=22) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#23 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea068ea0, modules=0x2dce180, 
pieces=0x391e440,
     pos=pos@entry=23) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#24 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea069160, modules=0x2dd3b20, 
pieces=0x3985000,
     pos=pos@entry=24) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#25 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea069420, modules=0x2db3a40, 
pieces=0x3902a60,
     pos=pos@entry=25) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#26 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea0696e0, modules=0x2dd0ea0, 
pieces=0x3962440,
     pos=pos@entry=26) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#27 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea0699a0, modules=0x2db0c80, 
pieces=0x391e360,
     pos=pos@entry=27) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#28 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea069c60, modules=0x2db0a20, 
pieces=0x3992f00,
     pos=pos@entry=28) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#29 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea069f20, modules=0x2db3460, 
pieces=0x3949600,
     pos=pos@entry=29) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#30 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06a1e0, modules=0x2d77880, 
pieces=0x389b260,
     pos=pos@entry=30) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#31 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06a4a0, modules=0x2d77a80, 
pieces=0x3867540,
     pos=pos@entry=31) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#32 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06a760, modules=0x2dba480, 
pieces=0x3975f40,
     pos=pos@entry=32) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#33 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06aa20, modules=0x2db3480, 
pieces=0x3848ba0,
     pos=pos@entry=33) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#34 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06ace0, modules=0x2db0c60, 
pieces=0x38dc620,
     pos=pos@entry=34) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#35 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06afa0, modules=0x2db0c00, 
pieces=0x2de8160,
     pos=pos@entry=35) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#36 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06b260, modules=0x2d7a420, 
pieces=0x38d9f60,
     pos=pos@entry=36) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#37 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06b520, modules=0x2db0aa0, 
pieces=0x3985360,
     pos=pos@entry=37) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#38 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06b7e0, modules=0x2d77a60, 
pieces=0x3959240,
     pos=pos@entry=38) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#39 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06ba40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06ba60,
     out_bpp=out_bpp@entry=0x7fffea06ba20,
     roi_out=roi_out@entry=0x7fffea06baa0, modules=0x2dbd0e0, 
pieces=0x393e6e0,
     pos=pos@entry=39) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#40 0x00007ffff7a255b4 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06c800,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06c820, out_bpp=0x2e84c30,
     out_bpp@entry=0x7fffea06c7e0, roi_out=roi_out@entry=0x7fffea06bd60,
     modules=0x2db0ba0, pieces=0x3898220, pos=pos@entry=40)
     at /home/david/darktable/src/develop/pixelpipe_hb.c:785
#41 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06c800,
     cl_mem_output=cl_mem_output@entry=0x7fffea06c820,
     out_bpp=out_bpp@entry=0x7fffea06c7e0,
     roi_out=roi_out@entry=0x7fffea06c020, modules=0x2dd1220, 
pieces=0x385e940,
     pos=pos@entry=41) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#42 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06c800,
     cl_mem_output=cl_mem_output@entry=0x7fffea06c820,
     out_bpp=out_bpp@entry=0x7fffea06c7e0,
     roi_out=roi_out@entry=0x7fffea06c2e0, modules=0x2db0a60, 
pieces=0x385e920,
     pos=pos@entry=42) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#43 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06c800,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06c820,
     out_bpp=out_bpp@entry=0x7fffea06c7e0,
     roi_out=roi_out@entry=0x7fffea06c5a0, modules=0x2d7a840, 
pieces=0x39028c0,
     pos=pos@entry=43) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#44 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06c800,
     cl_mem_output=cl_mem_output@entry=0x7fffea06c820,
     out_bpp=out_bpp@entry=0x7fffea06c7e0,
     roi_out=roi_out@entry=0x7fffea06c860, modules=0x2db34c0, 
pieces=0x377ea40,
     pos=pos@entry=44) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#45 0x00007ffff7a255b4 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06db40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06db60, out_bpp=0x2e84c30,
     out_bpp@entry=0x7fffea06db20, roi_out=roi_out@entry=0x7fffea06cb20,
     modules=0x2dd3ae0, pieces=0x3848b00, pos=pos@entry=45)
     at /home/david/darktable/src/develop/pixelpipe_hb.c:785
#46 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06db40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06db60,
     out_bpp=out_bpp@entry=0x7fffea06db20,
     roi_out=roi_out@entry=0x7fffea06cde0, modules=0x2dd6cc0, 
pieces=0x3867520,
     pos=pos@entry=46) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#47 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06db40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06db60,
     out_bpp=out_bpp@entry=0x7fffea06db20,
     roi_out=roi_out@entry=0x7fffea06d0a0, modules=0x2d7a600, 
pieces=0x38d9fa0,
     pos=pos@entry=47) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#48 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06db40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06db60,
     out_bpp=out_bpp@entry=0x7fffea06db20,
     roi_out=roi_out@entry=0x7fffea06d360, modules=0x2dce000, 
pieces=0x3993080,
     pos=pos@entry=48) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#49 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06db40,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06db60,
     out_bpp=out_bpp@entry=0x7fffea06db20,
     roi_out=roi_out@entry=0x7fffea06d620, modules=0x2db3620, 
pieces=0x38a0920,
     pos=pos@entry=49) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#50 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06db40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06db60,
     out_bpp=out_bpp@entry=0x7fffea06db20,
     roi_out=roi_out@entry=0x7fffea06d8e0, modules=0x2d77740, 
pieces=0x3861b00,
     pos=pos@entry=50) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#51 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06db40,
     cl_mem_output=cl_mem_output@entry=0x7fffea06db60,
     out_bpp=out_bpp@entry=0x7fffea06db20,
     roi_out=roi_out@entry=0x7fffea06dba0, modules=0x2d77a20, 
pieces=0x3619b20,
     pos=pos@entry=51) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#52 0x00007ffff7a255b4 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06e640,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06e660, out_bpp=0x2e84c30,
     out_bpp@entry=0x7fffea06e620, roi_out=roi_out@entry=0x7fffea06de60,
     modules=0x2d77b60, pieces=0x37fad40, pos=pos@entry=52)
     at /home/david/darktable/src/develop/pixelpipe_hb.c:785
#53 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06e640,
     cl_mem_output=cl_mem_output@entry=0x7fffea06e660,
     out_bpp=out_bpp@entry=0x7fffea06e620,
     roi_out=roi_out@entry=0x7fffea06e120, modules=0x2db0d20, 
pieces=0x389b460,
     pos=pos@entry=53) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#54 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06e640,
     cl_mem_output=cl_mem_output@entry=0x7fffea06e660,
     out_bpp=out_bpp@entry=0x7fffea06e620,
     roi_out=roi_out@entry=0x7fffea06e3e0, modules=0x2d77c80, 
pieces=0x38c2b40,
     pos=pos@entry=54) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#55 0x00007ffff7a24e22 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06e640,
---Type <return> to continue, or q <return> to quit---
     cl_mem_output=cl_mem_output@entry=0x7fffea06e660,
     out_bpp=out_bpp@entry=0x7fffea06e620,
     roi_out=roi_out@entry=0x7fffea06e6a0, modules=0x2dce140, 
pieces=0x38fa6e0,
     pos=pos@entry=55) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:659
#56 0x00007ffff7a255b4 in dt_dev_pixelpipe_process_rec (
     pipe=pipe@entry=0x2e84b60, dev=dev@entry=0x2e84720,
     output=output@entry=0x7fffea06e840,
     cl_mem_output=cl_mem_output@entry=0x7fffea06e820, out_bpp=0x2e84c30,
     out_bpp@entry=0x7fffea06e81c, roi_out=roi_out@entry=0x7fffea06e860,
     modules=modules@entry=0x2db3760, pieces=pieces@entry=0x39930a0,
     pos=pos@entry=56) at 
/home/david/darktable/src/develop/pixelpipe_hb.c:785
#57 0x00007ffff7a2928d in dt_dev_pixelpipe_process_rec_and_backcopy 
(pos=56,
     pieces=0x39930a0, modules=0x2db3760, roi_out=0x7fffea06e860,
     out_bpp=0x7fffea06e81c, cl_mem_output=0x7fffea06e820,
     output=0x7fffea06e840, dev=0x2e84720, pipe=0x2e84b60)
     at /home/david/darktable/src/develop/pixelpipe_hb.c:2040
#58 dt_dev_pixelpipe_process (pipe=0x2e84b60, dev=dev@entry=0x2e84720, 
x=56,
     x@entry=0, y=47920992, y@entry=0, width=1284, height=853,
     scale=9.00369554e-37)
     at /home/david/darktable/src/develop/pixelpipe_hb.c:2124
#59 0x00007ffff7a16900 in dt_dev_process_image_job (dev=0x2e84720)
---Type <return> to continue, or q <return> to quit---
     at /home/david/darktable/src/develop/develop.c:341
#60 0x00007ffff7a11bf0 in dt_dev_process_image_job_run (job=<optimized out>)
     at /home/david/darktable/src/control/jobs/develop_jobs.c:40
#61 0x00007ffff7a0a714 in dt_control_run_job_res (s=s@entry=0x6c6cd0,
     res=res@entry=1) at /home/david/darktable/src/control/control.c:964
#62 0x00007ffff7a0b0dd in dt_control_work_res (ptr=0x6c6cd0)
     at /home/david/darktable/src/control/control.c:1203
#63 0x00007ffff7736e9a in start_thread ()
    from /lib/x86_64-linux-gnu/libpthread.so.0
#64 0x00007ffff7463ccd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#65 0x0000000000000000 in ?? ()
(gdb)


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