New subject: [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)

18 Jan 2015

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

            Bug ID: 37922
           Summary: Unity3D 4.6 (.NET app) freezes/hangs sometimes when
                    reopening a newly created project
           Product: Wine
           Version: 1.7.34
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs(a)winehq.org
          Reporter: focht(a)gmx.net
      Distribution: ---

Hello folks,

as the summary says. A user in #winehq reported this.

Let's recap the history of the chat first to provide some insights of other
problems encountered and solved.

(skip if you are bored)

--- quote ---
<user> hi, i'm trying to install Unity3D on wine. When i run this script [1]
the installer says "error: dotnet35 conflicts with dotnet20, which is already
installed.". I do that on a clean .wine directory. [1]
https://github.com/Unity3D-Wine-Support/Unity3D-on-Wine/blob/master/unity3d....
--- quote ---

Although this was indeed done on a clean 32-bit prefix, the user likely
interrupted the installation at least once (probably at the time when .NET
2.0/3.0 installer was already run).
Resuming of interrupted steps/recipes via 'winetricks' won't work by design.

The provided logs showed another common problem: Samba/Winbind component
missing.

--- snip ---
err:winediag:SECUR32_initNTLMSP ntlm_auth was not found or is outdated. Make
sure that ntlm_auth >= 3.0.25 is in your path. Usually, you can find it in the
winbind package of your distribution.
--- snip ---

In this case it's harmless and not the cause of install failure.
The installation was still suggested though, but never carried out due to
dependency problems.

Next one ...

--- snip ---
Executing wine dotnetfx.exe /q /c:install.exe /q
...
fixme:advapi:LsaOpenPolicy ((null),0x33f2c4,0x00000001,0x33f2b0) stub
fixme:advapi:LsaClose (0xcafe) stub
fixme:ntdll:NtLockFile I/O completion on lock not implemented yet
err:mscoree:LoadLibraryShim error reading registry key for installroot
err:mscoree:LoadLibraryShim error reading registry key for installroot
err:mscoree:LoadLibraryShim error reading registry key for installroot
err:mscoree:LoadLibraryShim error reading registry key for installroot
--- snip ---

Whoops, this should never happen.
Wine-Mono mscoree bootstrapper dll (builtin) still gets loaded after MS .NET
installer started?

--- quote ---
<user> initially i had pacman -S wine-mono, then there are in a unwritable path
<user> Now i removed wine-mono
--- quote ---

Eeek. 'winetricks' automatically handles Mono uninstallation from prefix to
avoid conflicts with .NET installers. Since it was never detected 'installed',
builtin was still there and preferred (it would have worked if Wine was built
with '--disable-mscoree' like in my case).

Instead of trying to fix the issues with Wine 1.7.x present, the user went back
to Wine 1.6

--- quote ---
<user> i'm doing a clean install with 1.6.2
<user> let's see
--- quote ---

--- snip ---
Executing wine dotnetfx.exe /q /c:install.exe /q
...
fixme:advapi:LsaOpenPolicy ((null),0x33f2c4,0x00000001,0x33f2b0) stub
fixme:advapi:LsaClose (0xcafe) stub
err:msidb:get_tablecolumns column 1 out of range
err:msidb:get_tablecolumns column 2 out of range
--- snip ---

That's https://bugs.winehq.org/show_bug.cgi?id=36139 for you.

--- quote ---
<user> lol i need to downgrade gcc or upgrade wine
<user> interesting
--- quote ---

Don't build 1.6.2 with 4.9.0 or apply
https://source.winehq.org/git/wine.git/commit/deb274226783ab886bdb44876944e1...
(distros never backported it, only recently).

After he rebuilt Wine 1.6.2, he tried the 'winetricks' recipe again ...

--- quote ---
<user> i've run many times today always removing .wine
<user> same error every time
<focht> works for me here 1.7.34, git. something is broken on your host
<user> the only thing really strange in my host is linux-grsec
<focht> some "i ought to be hardened" stuff?
<user> all the closed source binaries + firefox web pages
<user> + i run them in a seccomp+caps jail (although not wine for now)
<focht> hmm ... you sure that stuff like ptrace has not been disabled but that
"security improvements"?
<user> i check one moment
<user> something is disabled
<user> http://pastebin.com/FEzQjHwx do you see something strange?
<focht> kernel.grsecurity.harden_ptrace = 1  and
kernel.grsecurity.ptrace_readexec = 1 for example
<slackner> <user>: all of the ptrace and ipc related restrictions could easily
break wine, which heavily relies on that - you should try to turn of everything
or even better boot with an unpatched kernel
<focht> talk about shooting yourself in the foot :)
<user> retring with these disabled :-S
<user> wine uses ptrace to intercept priviledged syscalls or something similar?
<slackner> <user>: no, it is used when windows apps try to set the debug
registers, and to read/write memory to/from other wine processes
<user> wow, the installation never gone so far with these grsec flags disabled
--- quote ---

Yay.

Then I managed to reproduce the hang/freeze too, with Wine 1.7.34/GIT.
Unfortunately not reliably.

--- quote ---
<focht> <user>: can't reproduce it anymore ..so random. do you have a reliable
way?
<user> install, create an empty project, (autoclose), (can't reopen)
<user> i'll fire up a virtualbox to do that again
<focht> i created now 5 projects in a row .. each restarts the editor and
opened previous ones .. no problems
<user> all in My Documents?
<focht> yup .. you don't select any packages right?
<user> nope really
...
<focht> hmpf .. wine's pdb parser doesn't like the provided pdb from unity
folder .. winedbg shooting itself in the food (as usual)
<focht> <user>: can you start the app this way: GC_DONT_GC=1 wine ./Unity.exe  
 and check if the freeze is still present with that
...
<user> what pdb are you talking about?
<focht> the devs of unity provided debug symbols for their app and some
component. probably to gather better bug reports from users (also indicating it
crashes often :)
<focht> Unity.pdb and mono.pdb in the app folder
<user> focht: i get the bug every time i run the executable
<focht> the fixme's are mostly harmless
<user> i know, but i don't understand where the bug lies
<focht> the freeze?
<user> it freezes without starting
<user> could i past here instead of pastebin?
<focht> no
<focht> well there is something strange going on with mono (foss impl. of
.net). multihreaded suspension of threads when those being suspended hold locks
is not nice
<user> i know mono :-P
<focht> mono is always up for nasty surprise
<user> i started three times, but it hangs in <defunct>
<focht> do you kill everything off before and wineserver -k ?
<user> i start in a cgroup jail to see understand the ps -A better; if i exit
from the jail no wineserver
<user> going to bed :-S
<user> night
<focht> gn8 me too
<focht> interesting target for investigation though ... saving here
--- quote ---

Splitting the actual problem into next comment ;-)

Regards

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[Bug 37922] New: Unity3D 4.6 (.NET app) freezes/hangs sometimes when reopening a newly created project

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