[Bug 60432] New: Wargaming Game Center: integrity check stalls while a VPN utun interface is present (macOS)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60432

            Bug ID: 60432
           Summary: Wargaming Game Center: integrity check stalls while a
                    VPN utun interface is present (macOS)
           Product: Wine
           Version: 11.18
          Hardware: x86-64
               URL: https://redirect.wargaming.net/WGC/Wargaming_Game_Cent
                    er_Install_EU.exe
                OS: MacOS
            Status: UNCONFIRMED
          Keywords: download
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---

Created attachment 82245
  --> http://bugs.winehq.org/attachment.cgi?id=82245
Terminal output of the VPN run, Wine 11.18
(WINEDEBUG=err+all,warn+nsi,warn+iphlpapi), xz-compressed

Wargaming Game Center (WGC) stalls during "Check and Repair" (integrity
verification) of World of Tanks whenever a VPN client's TUN interface is up on
macOS. After ~12 seconds disk reading stops, CPU goes idle and the progress bar
stays at 25% indefinitely (waited 38 minutes). With the VPN disconnected, the
same check in the same prefix completes in about 4 minutes.

Environment:
- Wine 11.18 (official macOS build by Gcenx, wine-devel-11.18-osx64), fresh
64-bit WINEPREFIX
- macOS 27.0 on Apple Silicon (Wine runs under Rosetta 2)
- Wargaming Game Center 26.05.01.3645, World of Tanks EU 2.4.0.5473
- VPN client in TUN mode: creates utun4 (198.18.0.1) and adds 56 of the 83 IPv4
routes

Steps to reproduce:
1. Connect a VPN client that uses a utun interface.
2. Create a fresh prefix and install WGC (see the note on the installer below).
3. In WGC, use "Import Installed Games" to add an existing World of Tanks EU
installation.
4. Open Game Settings -> Check and Repair -> Continue.

Actual result: the check of part "client" starts, the game volume is read at
~450 MB/s for ~12 seconds, then reading drops to 0 MB/s and nothing else
happens. The UI shows "Checking integrity... 25%" forever. Disconnecting the
VPN does not make the stalled check continue.

Expected result: the check completes, as it does with the VPN disconnected.

A/B in the same fresh prefix, same game files:
- VPN connected: part "locale" completes in 1 s, part "client" stalls after ~12
s (no progress for 38 min).
- VPN disconnected: "locale" 1 s, "client" 52 s, "sdcontent" 88 s, "hdcontent"
76 s, all "completed successfully".
The same A/B was first observed on a copy of an existing prefix with the same
result.

While WGC runs with the VPN connected, Wine prints tens of thousands of nsi
warnings from ipv4_forward_enumerate_all ("Unexpected address type 0x20",
"Received unsupported sockaddr family 0x12") plus "ipv6_forward_enumerate_all
not implemented" (about 40,000 / 27,000 / 111 in the attached log). I could not
yet confirm whether these warnings are the cause; WGC bundles libtorrent 1.1.9,
which enumerates interfaces and routes. Component is left as "-unknown";
iphlpapi/nsi looks like the most likely candidate.

Note on installation: the official web installer
(https://redirect.wargaming.net/WGC/Wargaming_Game_Center_Install_EU.exe, SHA1
9fee6b470eab9a50568eb3c260618114eb9046f3) never shows its window in a fresh
prefix (100% CPU), and with /VERYSILENT it crashes right after its first HTTPS
request; this happens with and without the VPN, so it is a separate issue. For
this test WGC was installed the way the installer does it: the package it
downloads
(https://redirect.wargaming.net/wds/wargaming_game_center_install_eu_win64.wg...,
SHA1 c8edc3420add78170301da2ba4fa853de22987d8) was extracted with the
installer's own 7za.exe into C:\Program Files\Wargaming.net\GameCenter, and the
uninstall registry key and
C:\ProgramData\Wargaming.net\GameCenter\data\wgc_path.dat that the installer
creates were added by hand.

Attachments:
- wine-11.18-wgc-terminal-output-with-vpn.txt.xz: full terminal output of the
VPN run (WINEDEBUG=err+all,warn+nsi,warn+iphlpapi)
- wgc-integrity-timeline.txt: disk read rate sampled every ~4 s plus the
integrity lines from the WGC log for both runs

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[Bug 60432] Wargaming Game Center: integrity check stalls while a VPN utun interface is present (macOS)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60432

--- Comment #1 from john doe <[e-mail]> ---
Created attachment 82246
  --> http://bugs.winehq.org/attachment.cgi?id=82246
Disk read rate (every ~4 s) and WGC integrity log lines, VPN vs no VPN

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