[dolphin] [Bug 501118] Copy a large file causes corruption to a network share

[Kevin Dackiw]

https://bugs.kde.org/show_bug.cgi?id=501118

--- Comment #4 from Kevin Dackiw <kdackiw at gmail.com> ---
 I can confirm the addition of cache=none stops the big cache load/flush
cycle and indeed keeps things steady with the copy.
The target copy did verify correctly.

This was to my file server with SMB multichannel disabled.

On May 3, 2025 1:35 PM, Jens wrote:

https://bugs.kde.org/show_bug.cgi?id=501118

Jens <jens-bugs.kde.org at spamfreemail.de>
<jens-bugs.kde.org at spamfreemail.de> changed:

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--- Comment #2 from Jens <jens-bugs.kde.org at spamfreemail.de>
<jens-bugs.kde.org at spamfreemail.de> ---
I can second this, and here is another report:
https://superuser.com/questions/1814677/files-are-corrupt-after-copying-streaming-them-from-samba-fileshare

Copying using cp, rsync or any other tool on a SMB mount works. Copying via
Dolphin will corrupt the file.

Workaround: add "cache=none" to the SMB server's mount options so that the file
copy process is not cached.
Then, also Dolphin can copy the file without errors. And as an additional bonus
the copying speed doesn't oscillate so much any more.

This is not a fix however. And I think this is quite a serious issue.
How can we help finding the root cause of this?

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