[Bug 49931] New: 64-bit Dota 2 randomly crashes, but 32-bit Dota 2 works perfectly

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49931

            Bug ID: 49931
           Summary: 64-bit Dota 2 randomly crashes, but 32-bit Dota 2
                    works perfectly
           Product: Wine
           Version: 5.18
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: alexhenrie24 at gmail.com
      Distribution: ---

To reproduce:

1. Install Steam for Windows.

2. Install Dota 2 via `wine 'C:\Program Files (x86)\Steam\steam.exe'
steam://run/570`. This will install both the 32-bit and the 64-bit version of
the game.

3. Start 64-bit Dota via `wine 'C:\Program Files
(x86)\Steam\steamapps\common\dota 2 beta\game\bin\win64\dota2.exe'`.

4. In the lower-right corner, click Play Dota, Practice With Bots, Solo, Start
Bot Match.

5. Click on any hero, click Lock In, and wait for the game to start.

Before the game starts, Dota freezes, then crashes. Sometimes it crashes before
you even click Play Dota. Sometimes it crashes right after the map starts
rendering.

No useful information is written to the console in vanilla Wine. However, in
Wine Staging, lines similar to the following are printed repeatedly right
before the crash:

04b8:err:virtual:try_map_free_area mmap() error Cannot allocate memory, range
0x7f1522b50000-0x7f1522b53000, unix_prot 0x7.
04b8:err:virtual:try_map_free_area mmap() error Cannot allocate memory, range
0x7f1522c80000-0x7f1522c83000, unix_prot 0x7.
04b8:err:virtual:try_map_free_area mmap() error Cannot allocate memory, range
0x7f1523ad0000-0x7f1523ad3000, unix_prot 0x7.
04b8:err:virtual:alloc_area_in_reserved_or_between_callback Could not map in
reserved area.
m Files (x86)\Steam\steamapps\common\dota 2 beta\game\bin\win64\dota2.exe:
../wine-staging/dlls/ntdll/unix/virtual.c:1286: create_view: Assertion
`!((UINT_PTR)base & page_mask)' failed.

If you instead run 32-bit Dota via `wine 'C:\Program Files
(x86)\Steam\steamapps\common\dota 2 beta\game\bin\win32\dota2.exe'`, the game
runs perfectly.

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