This is also happening in the current user neon install. The issue if further amplified by the fact that these files are not deleted even after dolphin is closed.

I can't reproduce the bug

Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.80
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.1
Kernel Version: 6.15.10-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: AMD Radeon RX 6600

This is also happening on Fedora 43 Beta.

Operating System: Fedora Linux 43
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-0.rc6.49.fc43.x86_64 (64-bit)
Graphics Platform: Wayland

This is also happening on CachyOS

OS: CachyOS x86_64
Kernel: Linux 6.16.7-2-cachyos
DE: KDE Plasma 6.4.5
WM: KWin (Wayland)
CPU: Intel(R) Core(TM) i5-4460 (4) @ 3.40 GHz
GPU 1: AMD Radeon RX 6700 XT [Discrete]
GPU 2: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller @ 1.10 GHz [Integrated]
Locale: en_US.UTF-8

Operating System: CachyOS Linux 
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.7-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-4460  CPU @ 3.20GHz
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor 1: AMD Radeon RX 6700 XT
Graphics Processor 2: Intel® HD Graphics 4600
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: H97M-D3H

This behavior always occurs when the sort order in the file list is changed via the column headers. For example, if you change the sort order from "Name" to "Modified," a file is created in /tmp. It's not an empty file, but rather a configuration file with the [Dolphin] and [Settings] sections.

(In reply to Martin Schnitkemper from comment #5)
> This behavior always occurs when the sort order in the file list is changed
> via the column headers. For example, if you change the sort order from
> "Name" to "Modified," a file is created in /tmp. It's not an empty file, but
> rather a configuration file with the [Dolphin] and [Settings] sections.

Oh hey, you're spot on. I can reproduce this now. Thanks for clarifying!

Operating System: Fedora Linux 42
KDE Plasma Version: 6.5.80
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: AMD Radeon RX 6600

Reproduced on Fedora 42 KDE Plasma.

Empty /tmp/dolphin.XXXXXX files are randomly created when I open dolphin or change directory in dolphin. These files are seemingly never removed.

Browsing to /tmp will spawn these files continuously, but it's reproducible on any folder that keeps generating new files.
Point dolphin to a folder, run a script like:

while true; do
  touch ${the_folder}/`uuidgen`
  sleep 1
done

, and run `watch -n1 ls -lht /tmp` in terminal to watch /tmp getting filled.

---
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i7-12700F
Memory: 16 GiB of RAM (15.3 GiB usable)
Graphics Processor: AMD Radeon Graphics 9060 XT

A similar problem also occurs with the system monitor. When you open it, a zero-length plasma-systemmonitor.XXXXXX file is created in /tmp for each view. After exiting, it is filled into a file with the contents of the *.page files.

If two different applications exhibit similar behavior, it may not be Dolphin's fault, but rather a shared component.

I discovered the same thing. When opening the /tmp folder, files with the name dolphin.XXXXXX start to spawn infinitely. I monitored it using "inotifywait -m -e create --format '%w%f' /tmp". Kubuntu 25.10, Plasma 6.4.5, Dolphin 25.08.1. The same behavior occurs in KdeNeon, Plasma 6.5.1, as well as Fedora 43. However, in Debian 13 and Plasma 6.3, this does not happen. In general, the creation of a couple of temporary files occurs when opening/creating a folder/file (which seems excessive, to be honest) and, apparently, when opening the /tmp folder, it enters an endless loop.

A possibly relevant merge request was started @ https://invent.kde.org/system/dolphin/-/merge_requests/1099

https://discuss.kde.org/t/dolphin-creating-thousands-of-empty-folders-in-tmp/41065/2

Similar bug and one of the KDE devs responses was that users shouldn't be accessing /tmp/ - riiiiight.

Not a great look.

This is happening on one system which is a VM but it doesn't happen on the host machine, or my other physical machine. They are all running the same version of everything. The only main difference is the VM doesn't have a swap partition.

Dolphin Version 25.08.3
Operating System: EndeavourOS 
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.17.9-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-6500T CPU @ 2.50GHz
Memory: 32 GiB of RAM (31.2 GiB usable)
Graphics Processor: Mesa Intel® HD Graphics 530

Reproduced after clicking on the Modified column to sort it, on Debian 14 with Plasma 6.5.3.

(In reply to John from comment #13)
> Reproduced after clicking on the Modified column to sort it, on Debian 14
> with Plasma 6.5.3.

For me that only creates one file each time I click Modified column. This is just creating a prefs file. The actual symptom is it gets stuck in a loop creating a new file every second or so by doing nothing other than viewing /tmp/ with no interaction from the user.

*** Bug 510500 has been marked as a duplicate of this bug. ***

I'm able to reproduce this with Dolphin built from git-master on Solus just by having the terminal pane open and browsing to /tmp

*** Bug 512897 has been marked as a duplicate of this bug. ***