Nautilus becomes unresponsive when generating thumbnail for a very wide PNG

[Isaac]

(was titled "Nautilus hangs when browsing high-res PNG", this is not the case)

Binary package hint: nautilus

Steps to reproduce:
Get a high resolution PNG image (like this one, 3840x2400, 5K: http://www.deviantart.com/download/56406804/WQUXGA_by_Isaac_Kx.png)
Browse to the image's directory
Hang. Sometimes the entire desktop hangs, and applications continue functioning normally, if it weren't that everything on the screen is not responding.

[Holger Bauer (umarmung-planet)]

I can reproduce this with feisty and nautilus 2.18.1-0ubuntu1
There is also a bug open in debian.

[Pedro Villavicencio (pedro)]

Thanks for your bug report, may you try to send us the image? btw did you try to reproduce this with gutsy?, thanks!

[Isaac (isaacklinger)]

Reproduced Nautilus 1:2.19.6-0ubuntu1 (gusty)
Attached an offending image, 12000px wide.

Thanks for the reply, Pedro.

Isaac

[Pedro Villavicencio (pedro)]

Thanks Isaac, I cannot reproduce this, it looks fine here in my desktop, nautilus doesn't hang

[Isaac (isaacklinger)]

Sorry I can't be more specific. I just browse to the directory containing the image, and it hangs. Is there any way to generate a crash report?

[Sebastien Bacher (seb128)]

You can read http://wiki.ubuntu.com/DebuggingProgramCrash on how to get a stacktrace

[Marc Portier (marc-portier)]

I've just tested the very-wide png on my system. (Feisty)

It doesn't really 'hang' but rather takes full CPU for quite some time (3 minutes over here, I guess depending on specs YMMV)
During that time none of the 'nautilus-managed-windows' are being updated (so it surely feels like system locks up for a moment there)

I have the impression this is related to 'thumbnail generation' of those images since:

- this long wait-time only occurs *once* when the image is displayed a first time in nautilus
    (and to be clear: not if I close nautilus and then come back into that directory with a new window, even if other content in that directory changed)
    (but it does again if I 'kill' nautilus rather then just 'close' the window)

- this never happens if I disable the preview (Edit | Preferences > 'Preview' tab, choose 'never' for 'show thumbnails')

- this happens again if I change the file-name of the very-wide.png
    (either through F2 in nautilus, or with a CLI mv command and then use nautilus to walk into that directory again)
    (interesting: the name-change itself is only displayed/updated in nautilus after this wait-time)

By the way: I experienced this behaviour earlier on mounted remote (smb) disks where I assume the slow loading of the remote file will cause the effect earlier (i.e. for smaller files already)

[Marc Portier (marc-portier)]

As suggested on the http://wiki.ubuntu.com/DebuggingProgramCrash, I've used 'strace' to generate the log in attach.

Procedure I followed:

mpo@lamancha:~$ cd /tmp
mpo@lamancha:/tmp$ mv very-wide.png big.png
mpo@lamancha:/tmp$ pidof nautilus
9076
mpo@lamancha:/tmp$ nautilus . ; strace -Ff -tt -p 9076 2>&1 |tee /tmp/strace-nautilus.log

During the 'wait period' the console showed these lines at the bottom:

> [pid 15593] 16:35:27.422381 _exit(0) = ?
> Process 15593 detached

(hoping these help you locate the relevant part in the trace-log)

This for something more then a minute (yeah, it seems like I exaggerated a bit earlier there)
as soon as the flooding on the console started again I CTRL-C out of it, yielding the trace file in attach.

Hope this helps.

[Marc Portier (marc-portier)]

Searching around further I think the following known issues are related/duplicates to the behaviour I see:

http://bugzilla.gnome.org/show_bug.cgi?id=104224
https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/26198

http://bugzilla.gnome.org/show_bug.cgi?id=165344
https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/33467

Isaac, could you confirm?

(that it doesn't happen when disabling thumbnail-preview and
 that the system is not a real "hanging" but rather very busy for a very long time)

[Isaac (isaacklinger)]

Thanks a lot, mpo.

Nautilus doesn't hang.

It becomes unresponsive. I've attached an strace output.

Thanks again.

[Marc Portier (marc-portier)]

I just had the chance to test this with Ubuntu 7.10 (gutsy) which runs gnome 2.20.0 (build date 09/17/2007)
The problem described here persists.