[Bug 52322] New: wineserver memory leak during HTTPs download (Genshin Impact Launcher, Qt5)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52322

            Bug ID: 52322
           Summary: wineserver memory leak during HTTPs download (Genshin
                    Impact Launcher, Qt5)
           Product: Wine
           Version: 7.0-rc2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: mk939 at ymail.com
      Distribution: ---

The Genshin Impact launcher application downloads *.zip archives from an HTTPs
server using the Qt5 engine. During the download, the memory footprint of
wineserver increases proportionally (approx 1:2) to the amount of downloaded
data. This results in systems running out of free RAM due to the 30+ GB
download size (!)

This issue is not due to a recent change in Wine. Another user already reported
this to me 7 months ago (Wine 6.8-1).

Reproduction report 1: (4 months ago)

 * Wine 6.13 (vanilla)
 * Launcher version: 2.11.2.0 (Qt5 version: 5.12.5.0)

Reproduction report 2: (new)

 * Wine 7.0-rc2 (staging), Wine 7.0-rc2 (Lutris)
 * Launcher version: 2.14.1.0 (Qt5 version: 5.12.5.0)

Launcher download URL for reproduction:

https://genshinimpact.mihoyo.com/client_app/download/launcher/20211221171228_70L9WXsk22cU9LjI/mihoyo/GenshinImpact_install_mihoyo_20211214142226.exe

Due to DNS routing issues I yet cannot reproduce this bug with a recent vanilla
Wine version, but will give it a try as soon it is sorted out.

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