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Qt5Agg is leaking #9141

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tacaswell opened this issue Sep 1, 2017 · 12 comments
Closed

Qt5Agg is leaking #9141

tacaswell opened this issue Sep 1, 2017 · 12 comments
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GUI: Qt

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@tacaswell
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22:39 $ python unit/memleak.py Qt5Agg 50 out.png
   0: pymalloc   17627699, rss  116760576, nobjs      55869, garbage    0, files:    2
   1: pymalloc   17634545, rss  117694464, nobjs      55872, garbage    0, files:    2
   2: pymalloc   17635196, rss  118116352, nobjs      55875, garbage    0, files:    2
   3: pymalloc   17635615, rss  118386688, nobjs      55878, garbage    0, files:    2
   4: pymalloc   17636002, rss  118386688, nobjs      55881, garbage    0, files:    2
   5: pymalloc   17636389, rss  118386688, nobjs      55884, garbage    0, files:    2
   6: pymalloc   17636776, rss  118386688, nobjs      55887, garbage    0, files:    2
   7: pymalloc   17637176, rss  118386688, nobjs      55890, garbage    0, files:    2
   8: pymalloc   17637579, rss  118386688, nobjs      55893, garbage    0, files:    2
   9: pymalloc   17637985, rss  118386688, nobjs      55896, garbage    0, files:    2
  10: pymalloc   17638340, rss  118386688, nobjs      55899, garbage    0, files:    2
  11: pymalloc   17638791, rss  118386688, nobjs      55902, garbage    0, files:    2
  12: pymalloc   17639162, rss  118386688, nobjs      55905, garbage    0, files:    2
  13: pymalloc   17639533, rss  118386688, nobjs      55908, garbage    0, files:    2
  14: pymalloc   17639920, rss  118386688, nobjs      55911, garbage    0, files:    2
  15: pymalloc   17640307, rss  118386688, nobjs      55914, garbage    0, files:    2
  16: pymalloc   17640694, rss  118386688, nobjs      55917, garbage    0, files:    2
  17: pymalloc   17641081, rss  118386688, nobjs      55920, garbage    0, files:    2
  18: pymalloc   17641468, rss  118386688, nobjs      55923, garbage    0, files:    2
  19: pymalloc   17641902, rss  118386688, nobjs      55926, garbage    0, files:    2
  20: pymalloc   17642323, rss  118386688, nobjs      55929, garbage    0, files:    2
  21: pymalloc   17642573, rss  118386688, nobjs      55932, garbage    0, files:    2
  22: pymalloc   17643421, rss  118386688, nobjs      55935, garbage    0, files:    2
  23: pymalloc   17643987, rss  118386688, nobjs      55938, garbage    0, files:    2
  24: pymalloc   17644342, rss  118386688, nobjs      55941, garbage    0, files:    2
  25: pymalloc   17644745, rss  118386688, nobjs      55944, garbage    0, files:    2
  26: pymalloc   17645132, rss  118386688, nobjs      55947, garbage    0, files:    2
  27: pymalloc   17645519, rss  118386688, nobjs      55950, garbage    0, files:    2
  28: pymalloc   17645906, rss  118386688, nobjs      55953, garbage    0, files:    2
  29: pymalloc   17646340, rss  118386688, nobjs      55956, garbage    0, files:    2
  30: pymalloc   17646816, rss  118386688, nobjs      55959, garbage    0, files:    2
  31: pymalloc   17647075, rss  118386688, nobjs      55962, garbage    0, files:    2
  32: pymalloc   17647470, rss  118386688, nobjs      55965, garbage    0, files:    2
  33: pymalloc   17647857, rss  118386688, nobjs      55968, garbage    0, files:    2
  34: pymalloc   17648244, rss  118386688, nobjs      55971, garbage    0, files:    2
  35: pymalloc   17648631, rss  118386688, nobjs      55974, garbage    0, files:    2
  36: pymalloc   17649049, rss  118386688, nobjs      55977, garbage    0, files:    2
  37: pymalloc   17649461, rss  118386688, nobjs      55980, garbage    0, files:    2
  38: pymalloc   17649784, rss  118386688, nobjs      55983, garbage    0, files:    2
  39: pymalloc   17650115, rss  118386688, nobjs      55986, garbage    0, files:    2
  40: pymalloc   17650531, rss  118386688, nobjs      55989, garbage    0, files:    2
  41: pymalloc   17651001, rss  118386688, nobjs      55992, garbage    0, files:    2
  42: pymalloc   17651260, rss  118386688, nobjs      55995, garbage    0, files:    2
  43: pymalloc   17651727, rss  118386688, nobjs      55998, garbage    0, files:    2
  44: pymalloc   17652114, rss  118386688, nobjs      56001, garbage    0, files:    2
  45: pymalloc   17652501, rss  118386688, nobjs      56004, garbage    0, files:    2
  46: pymalloc   17652888, rss  118386688, nobjs      56007, garbage    0, files:    2
  47: pymalloc   17653195, rss  118386688, nobjs      56010, garbage    0, files:    2
  48: pymalloc   17653611, rss  118386688, nobjs      56013, garbage    0, files:    2
  49: pymalloc   17654065, rss  118657024, nobjs      56016, garbage    0, files:    2
Average memory consumed per loop: 10813.4400 bytes
@tacaswell tacaswell added the Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. label Sep 1, 2017
@tacaswell tacaswell added this to the 2.1 (next point release) milestone Sep 1, 2017
@QuLogic
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QuLogic commented Sep 1, 2017 •
edited

Also, I get this at the end:

  49: pymalloc   17023128, rss  112095232, nobjs      55454, garbage    0, files:    2
Traceback (most recent call last):
  File "unit/memleak.py", line 143, in <module>
    run_memleak_test(MemleakTest(args.empty), args.iterations[0], args.report[0])
  File "unit/memleak.py", line 59, in run_memleak_test
    (np.sum(rss_peaks[starti+1:] - rss_peaks[starti:-1]) / float(endi - starti)))
TypeError: slice indices must be integers or None or have an __index__ method

Also, pretty sure that sum is redundant and could just be (rss_peaks[-1] - rss_peaks[starti]). doesn't seem to work that way.

@tacaswell
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See #9142 for a fix to that.

@anntzer
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anntzer commented Sep 1, 2017 •
edited

This bisects to earlier than 1.5.0 (#6854 needs to be manually applied for testing early commits, and I copied unit/memleak.py out of the source tree for the bisection).

I can't test 1.4.3 because trying to build it crashes gcc :-)

src/_png.cpp: In member function ‘Py::Object _png_module::write_png(const Py::Tuple&)’:
src/_png.cpp:103:12: internal compiler error: Segmentation fault
 Py::Object _png_module::write_png(const Py::Tuple& args)
            ^~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.
error: command 'gcc' failed with exit status 1

Given how long the issue has been around I would suggest that this issue, while important, should not be considered as release critical.

Edit: looks like we're leaking dead weakrefs (found by comparing Counter(map(type, gc.get_objects())) between iterations), which is quite funny in a sense :-)

@tacaswell tacaswell modified the milestones: 2.1.1 (next bug fix release), 2.1 (next point release) Sep 1, 2017
@tacaswell tacaswell added GUI: Qt and removed Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. labels Sep 1, 2017
@QuLogic
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QuLogic commented Sep 1, 2017

Every time I bisect, I get a different commit, so this seems a bit random. We probably need to figure out a faster&stabler test to really get to the bottom of this.

@anntzer
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anntzer commented Sep 1, 2017 •
edited 

import gc
from matplotlib import pyplot as plt

for _ in range(10):
    plt.figure()
    gc.collect()
    print(len(gc.get_objects()))
    plt.close("all")

is sufficient to show the leak, so we can in fact just run the loop two or three times and fail if the len's are different.

Specifically, tkagg always returns the same number, whereas qt5agg sees a jump of 158 objects between the first and second iteration, and 3 objects per iteration after that. The test always fails even as far back as 1.5.0 + qt4agg.

@tacaswell
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I wonder if this due to a change in qt/pyqt not necessarily on our side?

@anntzer
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anntzer commented Sep 7, 2017

I think it's a bug in pyqt. PySide(2) also leaks, but appears to leak only one object per iteration.

I find that the leaked dead weakrefs started as pointing respectively to a FigureManagerQT, a FigureCanvasQTAgg, and a NavigationToolbar2QT.

https://pypi.python.org/pypi/objgraph is useful for this kind of exploration...

@dopplershift
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If both are leaking, I'm skeptical that matplotlib is doing the right thing.

@tacaswell
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We are not doing any of the c-work with pyqt which is the easiest way leak references.

The big jump between 1 and 2 does not bother me, that seems like qt starting it's self up.

2 of those classes are things we subclass from qt objects, but all of then are things that I think we have in circular references with Qt objects.

@tacaswell tacaswell modified the milestones: 2.1.1 (next bug fix release), 2.2 (next feature release) Oct 9, 2017
@anntzer anntzer mentioned this issue Aug 29, 2018
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@anntzer anntzer mentioned this issue Oct 9, 2018
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@QuLogic QuLogic mentioned this issue May 20, 2020
Closed
@tacaswell
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Going to optimistically close this as fixed by #17468

@anntzer
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anntzer commented May 22, 2020 •
edited

is is actually fixed, or are you just "optimistically" hoping it is?

@tacaswell
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I was going on #17385 (comment)

Going on @QuLogic 's comment in this thread, I think the problem may be worse than it bisecting badly, the leak seems to be non-deterministic:

(bleeding) ✘  ~/source/p/matplotlib [master {origin/master}|… 3⚑ 14]
jupiter@09:04  ➤  python tools/memleak.py qt5Agg 50 out.png
   0: pymalloc    1118851, rss  110944256, nobjs      62623, garbage    0, files:    1
   1: pymalloc    1128306, rss  110813184, nobjs      62626, garbage    0, files:    1
   2: pymalloc    1135252, rss  111386624, nobjs      62629, garbage    0, files:    1
   3: pymalloc    1137633, rss  111624192, nobjs      62632, garbage    0, files:    1
   4: pymalloc    1143859, rss  111624192, nobjs      62635, garbage    0, files:    1
   5: pymalloc    1147160, rss  111624192, nobjs      62638, garbage    0, files:    1
   6: pymalloc    1148843, rss  111865856, nobjs      62641, garbage    0, files:    1
   7: pymalloc    1152449, rss  111865856, nobjs      62644, garbage    0, files:    1
   8: pymalloc    1153153, rss  111865856, nobjs      62647, garbage    0, files:    1
   9: pymalloc    1162038, rss  111865856, nobjs      62650, garbage    0, files:    1
  10: pymalloc    1162482, rss  111865856, nobjs      62653, garbage    0, files:    1
  11: pymalloc    1164973, rss  111865856, nobjs      62656, garbage    0, files:    1
  12: pymalloc    1166401, rss  111865856, nobjs      62659, garbage    0, files:    1
  13: pymalloc    1167127, rss  111865856, nobjs      62662, garbage    0, files:    1
  14: pymalloc    1171441, rss  111865856, nobjs      62665, garbage    0, files:    1
  15: pymalloc    1180176, rss  112914432, nobjs      62668, garbage    0, files:    1
  16: pymalloc    1182889, rss  111857664, nobjs      62671, garbage    0, files:    1
  17: pymalloc    1183715, rss  111857664, nobjs      62674, garbage    0, files:    1
  18: pymalloc    1183952, rss  111857664, nobjs      62677, garbage    0, files:    1
  19: pymalloc    1185027, rss  111857664, nobjs      62680, garbage    0, files:    1
  20: pymalloc    1185216, rss  111857664, nobjs      62683, garbage    0, files:    1
  21: pymalloc    1187158, rss  111857664, nobjs      62686, garbage    0, files:    1
  22: pymalloc    1187527, rss  111857664, nobjs      62689, garbage    0, files:    1
  23: pymalloc    1188422, rss  111857664, nobjs      62692, garbage    0, files:    1
  24: pymalloc    1189088, rss  111857664, nobjs      62695, garbage    0, files:    1
  25: pymalloc    1189721, rss  111857664, nobjs      62698, garbage    0, files:    1
  26: pymalloc    1190026, rss  111857664, nobjs      62701, garbage    0, files:    1
  27: pymalloc    1190415, rss  111857664, nobjs      62704, garbage    0, files:    1
  28: pymalloc    1191142, rss  111857664, nobjs      62707, garbage    0, files:    1
  29: pymalloc    1191647, rss  111857664, nobjs      62710, garbage    0, files:    1
  30: pymalloc    1192326, rss  111857664, nobjs      62713, garbage    0, files:    1
  31: pymalloc    1197864, rss  111857664, nobjs      62716, garbage    0, files:    1
  32: pymalloc    1198653, rss  112906240, nobjs      62719, garbage    0, files:    1
  33: pymalloc    1198817, rss  111857664, nobjs      62722, garbage    0, files:    1
  34: pymalloc    1199437, rss  111857664, nobjs      62725, garbage    0, files:    1
  35: pymalloc    1202020, rss  111857664, nobjs      62728, garbage    0, files:    1
  36: pymalloc    1202204, rss  111857664, nobjs      62731, garbage    0, files:    1
  37: pymalloc    1203234, rss  111857664, nobjs      62734, garbage    0, files:    1
  38: pymalloc    1203641, rss  111857664, nobjs      62737, garbage    0, files:    1
  39: pymalloc    1203841, rss  111857664, nobjs      62740, garbage    0, files:    1
  40: pymalloc    1204025, rss  111857664, nobjs      62743, garbage    0, files:    1
  41: pymalloc    1204200, rss  112906240, nobjs      62746, garbage    0, files:    1
  42: pymalloc    1205061, rss  112906240, nobjs      62749, garbage    0, files:    1
  43: pymalloc    1205366, rss  111857664, nobjs      62752, garbage    0, files:    1
  44: pymalloc    1205963, rss  112906240, nobjs      62755, garbage    0, files:    1
  45: pymalloc    1206284, rss  112906240, nobjs      62758, garbage    0, files:    1
  46: pymalloc    1207128, rss  112906240, nobjs      62761, garbage    0, files:    1
  47: pymalloc    1207312, rss  112906240, nobjs      62764, garbage    0, files:    1
  48: pymalloc    1208113, rss  111857664, nobjs      62767, garbage    0, files:    1
  49: pymalloc    1208313, rss  112906240, nobjs      62770, garbage    0, files:    1
Average memory consumed per loop: 0.0000 bytes

(bleeding) ✔  ~/source/p/matplotlib [master {origin/master}|… 3⚑ 14]
jupiter@09:05  ➤  python tools/memleak.py qt5Agg 50 out.png
   0: pymalloc    1118751, rss  111480832, nobjs      62623, garbage    0, files:    1
   1: pymalloc    1128495, rss  111345664, nobjs      62626, garbage    0, files:    1
   2: pymalloc    1135367, rss  111472640, nobjs      62629, garbage    0, files:    1
   3: pymalloc    1137880, rss  111910912, nobjs      62632, garbage    0, files:    1
   4: pymalloc    1144018, rss  112152576, nobjs      62635, garbage    0, files:    1
   5: pymalloc    1147251, rss  112152576, nobjs      62638, garbage    0, files:    1
   6: pymalloc    1149070, rss  112152576, nobjs      62641, garbage    0, files:    1
   7: pymalloc    1152520, rss  112152576, nobjs      62644, garbage    0, files:    1
   8: pymalloc    1153208, rss  112148480, nobjs      62647, garbage    0, files:    1
   9: pymalloc    1162150, rss  112148480, nobjs      62650, garbage    0, files:    1
  10: pymalloc    1162530, rss  112148480, nobjs      62653, garbage    0, files:    1
  11: pymalloc    1165166, rss  112148480, nobjs      62656, garbage    0, files:    1
  12: pymalloc    1166417, rss  112148480, nobjs      62659, garbage    0, files:    1
  13: pymalloc    1167187, rss  112148480, nobjs      62662, garbage    0, files:    1
  14: pymalloc    1171352, rss  112148480, nobjs      62665, garbage    0, files:    1
  15: pymalloc    1180071, rss  112148480, nobjs      62668, garbage    0, files:    1
  16: pymalloc    1182760, rss  112148480, nobjs      62671, garbage    0, files:    1
  17: pymalloc    1183586, rss  112148480, nobjs      62674, garbage    0, files:    1
  18: pymalloc    1183730, rss  112148480, nobjs      62677, garbage    0, files:    1
  19: pymalloc    1185026, rss  112148480, nobjs      62680, garbage    0, files:    1
  20: pymalloc    1185308, rss  112148480, nobjs      62683, garbage    0, files:    1
  21: pymalloc    1186965, rss  112148480, nobjs      62686, garbage    0, files:    1
  22: pymalloc    1187318, rss  112148480, nobjs      62689, garbage    0, files:    1
  23: pymalloc    1188277, rss  112148480, nobjs      62692, garbage    0, files:    1
  24: pymalloc    1188914, rss  112148480, nobjs      62695, garbage    0, files:    1
  25: pymalloc    1189697, rss  112148480, nobjs      62698, garbage    0, files:    1
  26: pymalloc    1190057, rss  112148480, nobjs      62701, garbage    0, files:    1
  27: pymalloc    1190403, rss  112148480, nobjs      62704, garbage    0, files:    1
  28: pymalloc    1190912, rss  113197056, nobjs      62707, garbage    0, files:    1
  29: pymalloc    1191654, rss  113197056, nobjs      62710, garbage    0, files:    1
  30: pymalloc    1192342, rss  112390144, nobjs      62713, garbage    0, files:    1
  31: pymalloc    1197762, rss  112148480, nobjs      62716, garbage    0, files:    1
  32: pymalloc    1198780, rss  112390144, nobjs      62719, garbage    0, files:    1
  33: pymalloc    1199012, rss  112390144, nobjs      62722, garbage    0, files:    1
  34: pymalloc    1199484, rss  112390144, nobjs      62725, garbage    0, files:    1
  35: pymalloc    1202083, rss  112390144, nobjs      62728, garbage    0, files:    1
  36: pymalloc    1202367, rss  112390144, nobjs      62731, garbage    0, files:    1
  37: pymalloc    1203533, rss  112390144, nobjs      62734, garbage    0, files:    1
  38: pymalloc    1203856, rss  112390144, nobjs      62737, garbage    0, files:    1
  39: pymalloc    1204040, rss  112390144, nobjs      62740, garbage    0, files:    1
  40: pymalloc    1204256, rss  112390144, nobjs      62743, garbage    0, files:    1
  41: pymalloc    1204420, rss  112390144, nobjs      62746, garbage    0, files:    1
  42: pymalloc    1205317, rss  112390144, nobjs      62749, garbage    0, files:    1
  43: pymalloc    1205533, rss  112390144, nobjs      62752, garbage    0, files:    1
  44: pymalloc    1206151, rss  112390144, nobjs      62755, garbage    0, files:    1
  45: pymalloc    1206431, rss  112390144, nobjs      62758, garbage    0, files:    1
  46: pymalloc    1207307, rss  112390144, nobjs      62761, garbage    0, files:    1
  47: pymalloc    1207507, rss  112390144, nobjs      62764, garbage    0, files:    1
  48: pymalloc    1208299, rss  112390144, nobjs      62767, garbage    0, files:    1
  49: pymalloc    1208636, rss  112390144, nobjs      62770, garbage    0, files:    1
Average memory consumed per loop: 41779.2000 bytes

(bleeding) ✔  ~/source/p/matplotlib [master {origin/master}|… 3⚑ 14]
jupiter@09:05  ➤  python tools/memleak.py qt5Agg 50 out.png
   0: pymalloc    1119490, rss  111407104, nobjs      62623, garbage    0, files:    1
   1: pymalloc    1129503, rss  111271936, nobjs      62626, garbage    0, files:    1
   2: pymalloc    1135930, rss  111837184, nobjs      62629, garbage    0, files:    1
   3: pymalloc    1138425, rss  112078848, nobjs      62632, garbage    0, files:    1
   4: pymalloc    1144442, rss  112078848, nobjs      62635, garbage    0, files:    1
   5: pymalloc    1147666, rss  112078848, nobjs      62638, garbage    0, files:    1
   6: pymalloc    1149494, rss  112078848, nobjs      62641, garbage    0, files:    1
   7: pymalloc    1152908, rss  112078848, nobjs      62644, garbage    0, files:    1
   8: pymalloc    1153712, rss  112078848, nobjs      62647, garbage    0, files:    1
   9: pymalloc    1162593, rss  112078848, nobjs      62650, garbage    0, files:    1
  10: pymalloc    1163098, rss  112078848, nobjs      62653, garbage    0, files:    1
  11: pymalloc    1165327, rss  112078848, nobjs      62656, garbage    0, files:    1
  12: pymalloc    1167049, rss  112078848, nobjs      62659, garbage    0, files:    1
  13: pymalloc    1167819, rss  112078848, nobjs      62662, garbage    0, files:    1
  14: pymalloc    1171920, rss  113127424, nobjs      62665, garbage    0, files:    1
  15: pymalloc    1180550, rss  112078848, nobjs      62668, garbage    0, files:    1
  16: pymalloc    1183536, rss  112078848, nobjs      62671, garbage    0, files:    1
  17: pymalloc    1184346, rss  113127424, nobjs      62674, garbage    0, files:    1
  18: pymalloc    1184686, rss  112078848, nobjs      62677, garbage    0, files:    1
  19: pymalloc    1185834, rss  112078848, nobjs      62680, garbage    0, files:    1
  20: pymalloc    1186252, rss  112078848, nobjs      62683, garbage    0, files:    1
  21: pymalloc    1187916, rss  112078848, nobjs      62686, garbage    0, files:    1
  22: pymalloc    1188374, rss  112078848, nobjs      62689, garbage    0, files:    1
  23: pymalloc    1189292, rss  112078848, nobjs      62692, garbage    0, files:    1
  24: pymalloc    1190079, rss  112078848, nobjs      62695, garbage    0, files:    1
  25: pymalloc    1190705, rss  112078848, nobjs      62698, garbage    0, files:    1
  26: pymalloc    1190889, rss  112078848, nobjs      62701, garbage    0, files:    1
  27: pymalloc    1191251, rss  113127424, nobjs      62704, garbage    0, files:    1
  28: pymalloc    1191853, rss  112078848, nobjs      62707, garbage    0, files:    1
  29: pymalloc    1192349, rss  113127424, nobjs      62710, garbage    0, files:    1
  30: pymalloc    1193174, rss  112078848, nobjs      62713, garbage    0, files:    1
  31: pymalloc    1198719, rss  112078848, nobjs      62716, garbage    0, files:    1
  32: pymalloc    1199508, rss  112078848, nobjs      62719, garbage    0, files:    1
  33: pymalloc    1199656, rss  112078848, nobjs      62722, garbage    0, files:    1
  34: pymalloc    1200224, rss  112078848, nobjs      62725, garbage    0, files:    1
  35: pymalloc    1202907, rss  112078848, nobjs      62728, garbage    0, files:    1
  36: pymalloc    1203091, rss  112078848, nobjs      62731, garbage    0, files:    1
  37: pymalloc    1204077, rss  112078848, nobjs      62734, garbage    0, files:    1
  38: pymalloc    1204400, rss  112316416, nobjs      62737, garbage    0, files:    1
  39: pymalloc    1204600, rss  112316416, nobjs      62740, garbage    0, files:    1
  40: pymalloc    1204816, rss  112316416, nobjs      62743, garbage    0, files:    1
  41: pymalloc    1205032, rss  112316416, nobjs      62746, garbage    0, files:    1
  42: pymalloc    1205845, rss  112316416, nobjs      62749, garbage    0, files:    1
  43: pymalloc    1206061, rss  112316416, nobjs      62752, garbage    0, files:    1
  44: pymalloc    1206763, rss  112316416, nobjs      62755, garbage    0, files:    1
  45: pymalloc    1206979, rss  112316416, nobjs      62758, garbage    0, files:    1
  46: pymalloc    1207871, rss  112316416, nobjs      62761, garbage    0, files:    1
  47: pymalloc    1208087, rss  112316416, nobjs      62764, garbage    0, files:    1
  48: pymalloc    1208904, rss  112316416, nobjs      62767, garbage    0, files:    1
  49: pymalloc    1209120, rss  112316416, nobjs      62770, garbage    0, files:    1
Average memory consumed per loop: 0.0000 bytes

(bleeding) ✔  ~/source/p/matplotlib [master {origin/master}|… 3⚑ 14]
jupiter@09:06  ➤

all 3 run with in a few minutes of each other in the env at v3.2.1-2585-ga1c51a0a1.

If you let it run longer you get:

qt5.pdf

I will open a PR with slight tweaks to the memleak script. We are never spinning the event loop so I think a bunch of the "leaked" memory is Qt objects that we have discarded but need the event loop to spin to finish their end-of-life process.

@story645 story645 removed this from the future releases milestone Oct 6, 2022
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@tacaswell @dopplershift @QuLogic @story645 @anntzer