[marble] [Bug 368006] New: Download progress halts with OSM

[Łukasz via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=368006

            Bug ID: 368006
           Summary: Download progress halts with OSM
           Product: marble
           Version: 1.14 (KDE Applications 16.04)
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: data
          Assignee: marble-bugs at kde.org
          Reporter: lrajchel1981 at gmail.com

When browsing maps with OSM, everything works fine for a few seconds. After
that it becomes virtually impossible as the download speed goes almost to zero,
i.e. the download progress bar stops at, say, 10%, and hardly moves any
further. This happens usually when zooming a location, and then stays like
that, the maps becomes un-browsable.

It's not a simple connection problem - in the meantime the OSM WWW service
works fine and fast. It seems to be related only to OSM, whereas other maps'
data download fast, even those based on OSM, like the OpenTopoMap (OTM): if I
switch to OTP, first the download speed is zero again, but when I restart
Marble, OTM works fine. When restarted with OSM, the download is OK only for a
very short time.

I tried increasing the RAM cache size (disk is unlimited), and deleting all the
config files (from ~/.config and ~/.local) - to no avail.

When run through strace, there are several problems, I'm not sure if they are
related to the OSM issue:

lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/share", {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0
lstat("/usr/share/marble", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/share/marble/data", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/share/marble/data/maps", {st_mode=S_IFDIR|0755, st_size=4096, ...})
= 0
lstat("/usr/share/marble/data/maps/earth", {st_mode=S_IFDIR|0755, st_size=4096,
...}) = 0
lstat("/usr/share/marble/data/maps/earth/openstreetmap", {st_mode=S_IFDIR|0755,
st_size=4096, ...}) = 0
lstat("/usr/share/marble/data/maps/earth/openstreetmap/18", 0x7ffd68fa50d0) =
-1 ENOENT (No such file or directory)
stat("", 0x7ffd68fa5210)                = -1 ENOENT (No such file or directory)
stat("/usr/share/marble/data", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/home/luke/.local/share/marble/maps/earth/openstreetmap/18/147143/89343.png",
0x7ffd68fa50c0) = -1 ENOENT (No such file or directory)

stat("/home/luke/.config/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such
file or directory)
stat("/home/luke/.config/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such
file or directory)
stat("/home/luke/.config/kde.org.conf", 0x7ffd68fa3780) = -1 ENOENT (No such
file or directory)
stat("/etc/xdg/kde.org/marble.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file
or directory)
stat("/etc/xdg/kde.org/marble.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file
or directory)
stat("/etc/xdg/kde.org/marble.conf", 0x7ffd68fa3780) = -1 ENOENT (No such file
or directory)
stat("/etc/xdg/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file or
directory)
stat("/etc/xdg/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file or
directory)
stat("/etc/xdg/kde.org.conf", 0x7ffd68fa3780) = -1 ENOENT (No such file or
directory)
stat("/home/luke/.config/kde.org/marble.conf", {st_mode=S_IFREG|0664,
st_size=176, ...}) = 0
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2705, ...}) = 0
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2705, ...}) = 0
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2705, ...}) = 0
stat("/home/luke/.config/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such
file or directory)
stat("/home/luke/.config/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such
file or directory)
stat("/home/luke/.config/kde.org.conf", 0x7ffd68fa3780) = -1 ENOENT (No such
file or directory)
stat("/etc/xdg/kde.org/marble.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file
or directory)
stat("/etc/xdg/kde.org/marble.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file
or directory)
stat("/etc/xdg/kde.org/marble.conf", 0x7ffd68fa3780) = -1 ENOENT (No such file
or directory)
stat("/etc/xdg/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file or
directory)
stat("/etc/xdg/kde.org.conf", 0x7ffd68fa37a0) = -1 ENOENT (No such file or
directory)
stat("/etc/xdg/kde.org.conf", 0x7ffd68fa3780) = -1 ENOENT (No such file or
directory)

Reproducible: Always

Steps to Reproduce:
1. Browse Maps with OSM
2. Zoom into some location
3. Browse maps a little bit

Actual Results:  
The download progress halts and hardly proceeds any further

Expected Results:  
Maps' data should be processed almost as fast as when using OSM online service

Marble Version 1.14.1 (stable release)
Fedora 24
KDE Frameworks 5.25.0
Qt 5.6.1 (built against 5.6.1)
The xcb windowing system

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