Nemo crash when opening a folder with lots of images

[LuckyL79]

 * Nemo version 4.2.3
 * issue is with windowed nemo
 * Distribution - Mint 19.2
 * Geforce 1080 Nvidia 435 drivers
 * 64 bit
 * AMD Ryzen 3700x

When I open nemo on a folder (mounted NTFS drive on USB 3.0) which has a lot of jpg images (~10000 files, around 5Mb each) and select show thumbnails nemo starts to create all the little preview images. But it does not finish - after some while (several minutes) nemo crashes - there is no error message shown.

I looked at the system monitor in parallel, it seems to occur when nemo is on memory usage between 2 and 3 GB.

It works fine in list view.

Steps to reproduce
see above

Expected behaviour
No crash, show all thumbnails

Other information

[smurphos]

Just to add this is reproducible on Ext4 partitions as-well. On any picture thumbnailing activity nemo's memory use rises as thumbnailing progresses and doesn't drop subsequently. This issue happens in all views but the memory increase is more dramatic in zoomed views. E,g this is output from top is about 10 minutes after nemo has thumbnailed just over 1000 images in icon view at maximum zoom. Nemo remains sluggish and laggy until nemo -q is run.

 1293 steve     20   0 2759412 1.499g 194612 S   0.0 20.0   5:26.76 nemo                                                
28485 steve     20   0 1165856 294404  83288 S   0.0  3.7   2:33.56 chrome  

[smurphos]

@mtwebster - Hi Michael - I just wanted to ping you in the hope this issue could get some attention in the beta bug fix rush. I've just tested with Nemo 4.4.1 from the Alpha PPA and the memory leakage on image thumbnailing is still very apparent.

Here are a couple of htop screenshots. First was a few minutes after Nemo had thumbnailed a folder of just over 700 images. At this point Nemo was unresponsive to clicks or scroll events. It eventually started reacting again and the memory usage did drop on moving to a different folder but was still very high.

Let me know if there further diagnostics that would help.