Nemo freezes on folders that have a large GIF file in them

[nick-s-b]

 * Nemo version (nemo --version)
 nemo 4.8.5
ffmpegthumbnailer 2.2.2-2

 * Is issue with desktop or windowed nemo?
 Windowed
 * Distribution - (Mint 17.2, Arch, Fedora 25, etc...)
 Arch
 * Graphics hardware *and* driver used
 Nvidia 1080, nvidia driver 465.31
 * 32 or 64 bit
 * 64-bit

Issue
When entering a folder with a large (~10MB) GIF file, nemo freezes for 10s or so and maxes out one of the cores. It's completely unresponsive and you can't click on anything. After ~10s, it goes back to normal.
However, if you navigate out of that folder and navigate back into it, it will freeze for another ~10s again.

Steps to reproduce

$ killall nemo
$ mkdir /tmp/gif ; cd /tmp/gif ; curl https://i.imgur.com/7b6GlNk.gif -o test.gif
$ nemo --debug .

Note that the thumbnail of the GIF file is immediately shown so this is not a thumbnailer issue. And even if it was a thumbnailer that's misbehaving and blocking, it should not lock-up nemo anyway. My default view is List View.

Expected behaviour
Don't freeze.

Other information
Debug log of nemo opening the folder with a large gif and freezing and a debug log of nemo opening an empty folder are identical. So this debug log is probably useless. But it's here anyway.

Click to expand!

$ nemo --debug .
(nemo:1146408): GLib-DEBUG: 02:12:54.952: unsetenv() is not thread-safe and should not be used after threads are created
(nemo:1146408): Gtk-DEBUG: 02:12:54.952: Connecting to session manager
(nemo:1146408): Gtk-DEBUG: 02:12:54.952: Failed to get the GNOME screensaver proxy: The name org.gnome.ScreenSaver is not owned
(nemo:1146408): Gtk-DEBUG: 02:12:54.952: Registering client 'org.Nemo' ''
(nemo:1146408): Gtk-DEBUG: 02:12:54.953: Registered client at '/org/gnome/SessionManager/Client1840'
(nemo:1146408): GLib-GIO-DEBUG: 02:12:54.956: _g_io_module_get_default: Found default implementation dconf (DConfSettingsBackend) for ‘gsettings-backend’
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/preferences/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/window-state/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/icon-view/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/list-view/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/compact-view/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/desktop/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/sidebar-panels/tree/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/plugins/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/nemo/preferences/menu-config/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/cinnamon/desktop/lockdown/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/cinnamon/desktop/background/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/cinnamon/desktop/media-handling/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/cinnamon/desktop/applications/terminal/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/cinnamon/desktop/privacy/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_fast: "/org/cinnamon/desktop/interface/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:54.956: watch_established: "/org/nemo/preferences/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/window-state/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/icon-view/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/list-view/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/compact-view/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/desktop/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/sidebar-panels/tree/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/plugins/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/nemo/preferences/menu-config/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/cinnamon/desktop/lockdown/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/cinnamon/desktop/background/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/cinnamon/desktop/media-handling/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/cinnamon/desktop/applications/terminal/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/cinnamon/desktop/privacy/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:54.957: watch_established: "/org/cinnamon/desktop/interface/" (establishing: 1)
(nemo:1146408): GLib-DEBUG: 02:12:54.984: setenv()/putenv() are not thread-safe and should not be used after threads are created
(nemo:1146408): dconf-DEBUG: 02:12:55.017: watch_fast: "/org/nemo/extensions/nemo-terminal/" (establishing: 0, active: 0)
(nemo:1146408): dconf-DEBUG: 02:12:55.017: watch_established: "/org/nemo/extensions/nemo-terminal/" (establishing: 1)
(nemo:1146408): dconf-DEBUG: 02:12:55.020: unwatch_fast: "/org/nemo/extensions/nemo-terminal/" (active: 1, establishing: 0)
** (nemo:1146408): DEBUG: 02:12:55.024: Open called on the GApplication instance; 1 files
(nemo:1146408): XApp-DEBUG: 02:12:55.092: XAppFavorites: init:
(nemo:1146408): dconf-DEBUG: 02:12:55.092: watch_fast: "/org/x/apps/favorites/" (establishing: 0, active: 0)
(nemo:1146408): XApp-DEBUG: 02:12:55.092: XAppFavorites: load_favorite: favorites loaded (0)
(nemo:1146408): dconf-DEBUG: 02:12:55.092: watch_established: "/org/x/apps/favorites/" (establishing: 1)
(nemo:1146408): XApp-DEBUG: 02:12:55.092: XAppFavorites: get_n_favorites returning number of items: 0.
(nemo:1146408): dconf-DEBUG: 02:12:55.093: change_fast
(nemo:1146408): XApp-DEBUG: 02:12:55.101: XAppFavorites: get_n_favorites returning number of items: 0.

Note: this is not a new bug. I've experienced it for a while now (years?) but I finally figured out what was causing it.
Note 2: I believe that this is not the same bug as #2605 and the workaround, namely setting the "Icon Captions" to "None", does not fix the issue for me.

[Jeremy7701]

Tried it - didn't experience any noticeable delay.
On your debug log it goes from

02:12:54.952: Registering client 'org.Nemo' '' to
02:12:55.101: XAppFavorites: get_n_favorites returning number of items: 0.

This is only 0.15 seconds...

[mtwebster]

Hi, do you have any plugins enabled? If so, try disabling all extensions and actions temporarily to see if anything like that could be causing it. I don't appear to have any issue either with this file.

[nick-s-b]

@Jeremy7701 Yes, but I still can't click on anything for 10s or so.
@mtwebster Michael, I only have Fileroller enabled. I just disabled it and restarted nemo. I get the same exact behavior as above. nemo pops-up a window and the folder displays a thumbnail of the file but I can't click on the test.gif at all. It's all frozen for ~5-10s. It's baffling to me.

Here are all my nemo settings:

org.nemo.preferences.menu-config selection-menu-make-link false
org.nemo.preferences.menu-config selection-menu-open-as-root true
org.nemo.preferences.menu-config selection-menu-scripts true
org.nemo.preferences.menu-config background-menu-show-hidden-files true
org.nemo.preferences.menu-config selection-menu-duplicate true
org.nemo.preferences.menu-config background-menu-paste true
org.nemo.preferences.menu-config selection-menu-pin true
org.nemo.preferences.menu-config selection-menu-open-in-new-window true
org.nemo.preferences.menu-config iconview-menu-organize-by-name true
org.nemo.preferences.menu-config desktop-menu-customize true
org.nemo.preferences.menu-config selection-menu-copy-to true
org.nemo.preferences.menu-config selection-menu-open true
org.nemo.preferences.menu-config background-menu-scripts true
org.nemo.preferences.menu-config background-menu-create-new-folder true
org.nemo.preferences.menu-config selection-menu-move-to true
org.nemo.preferences.menu-config background-menu-properties true
org.nemo.preferences.menu-config selection-menu-cut true
org.nemo.preferences.menu-config selection-menu-copy true
org.nemo.preferences.menu-config selection-menu-favorite true
org.nemo.preferences.menu-config selection-menu-move-to-trash true
org.nemo.preferences.menu-config selection-menu-rename true
org.nemo.preferences.menu-config iconview-menu-arrange-items true
org.nemo.preferences.menu-config background-menu-open-as-root true
org.nemo.preferences.menu-config background-menu-open-in-terminal true
org.nemo.preferences.menu-config selection-menu-open-in-new-tab true
org.nemo.preferences.menu-config selection-menu-paste true
org.nemo.preferences.menu-config selection-menu-properties true
org.nemo.preferences.menu-config selection-menu-open-in-terminal true

[Jeremy7701]

I have most plugins enabled and I still have the big GIF so I created an empty directory, and I can click on the two items without delay, instant play of the GIF [both preview and double-click] it even plays full-screen! I can change window focus without delay.

I tried a couple of times...

[mtwebster]

@nick-s-b Can you try this on a new/different user account?

[Fantu]

on debian bugtracker seems reported the same issue:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996805
about thumbnail there are other issues, @mtwebster about your PR testing a possible rebase in cinnamon-desktop thumbnail part (#2292) is there any news?

[nick-s-b]

nemo 5.0.3-1

Hi,

I just retested this issue and it's still giving me the same issue: nemo freezes for 20-30 seconds or so and one core of my CPU is maxed out. The Debian bug submitter tested it on a 12 core Ryzen and I have an older 8 core Intel i7 CPU. So it's not a CPU-specific issue. I also cannot reproduce it in a VM. Debian submitter is obviously on Debian and I'm on Arch so it's not a distro related issue either.

Could this be related to a thumbnailer? I have these installed:

ffmpegthumbnailer 2.2.2-2
gnome-epub-thumbnailer 1.6-2
raw-thumbnailer 0.2.1-7
webp-thumbnailer 0.0.2-7

If there's anything I can do to help narrow this down, please let me know with your ideas. Thanks!

[Fantu]

the user that report this on debian have found the cause and a solution: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996805#10
I don't have time to check better now but he has it found is a regression with gdk-pixbuf 2.42 probably is better check it if better fix is possible

[nick-s-b]

@Fantu Thank you for letting me know! I applied the patch and now nemo doesn't freeze anymore. Hopefully the patch makes it into the main branch.

[mtwebster]

I just pushed a fix based on the one mentioned above. As I couldn't reproduce this issue in the first place, I'll leave the bug open until someone has an opportunity to confirm that it's fixed.