[Bug 37922] Unity3D 4.6 (.NET app) freezes/hangs sometimes when reopening a newly created project (thread suspension during exit phase with loader lock held)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=37922

Anastasius Focht <focht at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|dotnet                      |
                URL|http://unity3d.com/unity/do |https://web.archive.org/web
                   |wnload/download-windows     |/20160404064109/http://down
                   |                            |load.unity3d.com/download_u
                   |                            |nity/UnitySetup-4.6.0.exe

--- Comment #2 from Anastasius Focht <focht at gmx.net> ---
Hello folks,

revisiting, still present.

It takes some patience to reproduce, as already mentioned years ago. After
creating 7 new projects I finally got a UI freeze and corresponding output in
console.

Prerequisites: none (native .NET Framework not needed anymore)

--- snip ---
$ pwd
/home/focht/.wine/drive_c/Program Files (x86)/Unity/Editor

$ WINEDEBUG=+loaddll wine ./Unity.exe
...
0490:err:ntdll:RtlpWaitForCriticalSection section 7BC6D1E0
"/home/focht/projects/wine/mainline-src/dlls/ntdll/loader.c: loader_section"
wait timed out in thread 0490, blocked by 0508, retrying (60 sec)
0490:err:ntdll:RtlpWaitForCriticalSection section 7BC6D1E0
"/home/focht/projects/wine/mainline-src/dlls/ntdll/loader.c: loader_section"
wait timed out in thread 0490, blocked by 0508, retrying (60 sec)
--- snip ---

tid = 0508 -> 1288 dec = Mono GC? thread
tid = 0490 -> 1168 dec = main thread

Attaching with debugger to unity process and dumping the thread stack in
question does prove it's exactly the same problem (function return addresses
match).

--- snip ---
Address  To       From     Comment  

1484FD8C F7D2A1A2 F7FE8559 F7FE8559                            
1484FDB4 7BC0B96C F7D2A1A2 F7D2A1A2                            
1484FDC8 0B76B081 7BC0B96C ntdll._NtClose at 4+C                  
1484FDD8 0B76B555 0B76B081 mono.0B76B081                       
1484FDE8 0B7108F2 0B76B555 mono.0B76B555                       
1484FDFC 0B77743B 0B7108F2 mono.0B7108F2                       
1484FE3C 0B7774E3 0B77743B mono.0B77743B                       
1484FE48 7BC26F56 0B7774E3 mono.0B7774E3                       
1484FE68 7BC29C5F 7BC26F56 ntdll._call_dll_entry_point+16      
1484FF2C 7BC29A02 7BC29C5F ntdll.MODULE_InitDLL+17F            
1484FF48 7BC49DA6 7BC29A02 ntdll.LdrShutdownThread+D2          
1484FF58 7B624748 7BC49DA6 ntdll.RtlExitUserThread+26          
1484FF6C 7BC49CB7 7B624748 kernel32. at BaseThreadInitThunk@12+18 
1484FF78 7BC49E47 7BC49CB7 ntdll._call_thread_func_wrapper+17  
1484FFF0 00000000 7BC49E47 ntdll.call_thread_func+87           
--- snip ---

Exiting thread 1288 has suspend count = 1 while holding the loader lock.

--- snip ---
Numb ID   Entry    TEB      EIP      S Priority      Name

6    1224 00000000 7FF02000 F7FE8557 0 Normal        
4    1192 00000000 7FF62000 F7FE8557 0 Normal        
2    1176 00000000 7FFA2000 F7FE8557 2 Normal        
Main 1168 00000000 7FFC2000 F7FE8559 0 Normal        Main Thread
7    1228 00000000 7FEF2000 F7FE8557 0 Normal        
5    1196 00000000 7FF52000 F7FE8559 0 TimeCritical  
3    1188 00000000 7FF72000 F7FE8557 0 Normal        
1    1172 00000000 7FFB2000 F7FE8557 1 Normal        
8    1288 00000000 7FE12000 F7FE8559 1 Normal        Mono gc thread?
12   1364 00000000 155D2000 F7FE8559 1 Normal        
9    1300 00000000 7FDE2000 F7FE8559 1 Normal        
13   1368 00000000 155C2000 F7FE8559 1 Normal        
10   1304 00000000 7FE32000 F7FE8559 1 Normal        
11   1340 00000000 7FF82000 F7FE8559 1 Normal        
14   1372 00000000 155B2000 F7FE8557 0 Normal        
15   1376 00000000 155A2000 F7FE8559 1 Normal        
16   1380 00000000 15592000 F7FE8557 0 Normal        
17   1384 00000000 15582000 F7FE8557 0 Normal        
18   1524 7BC397F0 155F2000 F7FE8559 0 Normal        
--- snip ---

Still an interesting problem for sure - exposed by Mono bug. But then again,
quoting myself:

--- quote ---
There are various reports from Windows users that Unity3D crashes or freezes
for them this problem might be present on Windows too, making this bug report
invalid.
--- quote ---

Not sure if it's worth the time. Probably only few people use old Unity3D 4.6
for development nowadays.

$ sha1sum UnitySetup-4.6.0.exe 
5cc7a85e186c965d230bcc7a2a463d92fbc2f7fc  UnitySetup-4.6.0.exe

$ du -sh UnitySetup-4.6.0.exe 
1.3G    UnitySetup-4.6.0.exe

$ wine --version
wine-6.0-rc2

Regards

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