[Bug 35561] New: Some MSYS2 commands generate a stackdump

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=35561

            Bug ID: 35561
           Summary: Some MSYS2 commands generate a stackdump
           Product: Wine
           Version: 1.7.12
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: irwin at beluga.phys.uvic.ca
    Classification: Unclassified

Created attachment 47484
  --> http://bugs.winehq.org/attachment.cgi?id=47484
strace log of execution of mintty

The general problem is I cannot start MSYS2 (the successor to MSYS) using its
msys2_shell.bat startup batch file (see directions at
http://sourceforge.net/p/msys2/wiki/MSYS2 installation/ concerning how to start
MSYS2).   That batch file (which executes a number of different MSYS2 commands)
exits almost immediately with a stack dump.

Alexey Pavlov, the developer of MSYS2, suggested I narrow down the problem by
attempting to execute the MSYS2 version of mintty.exe directly, and if that did
not work (which was the case) then run that app via the MSYS2 strace.exe
facility to help figure out what the exact problem is.  MSYS2 strace.exe did
appear to work and I attach its log (and also the associated stackdump for
mintty.exe).

Here are some additional details in case there are any difficulties replicating
this issue.

I have used 3 different versions of 32-bit Wine which I built myself on my
Debian Wheezy system.  Those are Unpatched Wine-1.6.1, patched Wine-1.6.1, and
patched Wine-1.7.12.  The patch used was "Hackish patch to fix APC problem"
taken from http://bugs.winehq.org/show_bug.cgi?id=24018.  The reason why that
extremely small patch is relevant is MSYS2 is essentially a simplified modern
Cygwin (as opposed to MSYS which is essentially a simplified ancient version of
Cygwin).  Because the patched versions give improved results (see below),
apparently the modern bits of Cygwin that are still part of MSYS2 trigger at
least the APC Wine bug for modern Cygwin that did not occur for older Cygwin
versions.

The version of MSYS2 I am using is msys2-base-i686-20140205.tar.xz. Unpacking
that created a top-level directory name of msys32 which I have changed to
MSYS2-20140205 to help keep better track of which version of MSYS2 I am trying.

I ran the MSYS2 version of strace with the patched versions of Wine as follows:


wine at raven> wineserver -k
wine at raven> wineserver -p
wine at raven> wineconsole --backend=curses cmd
Microsoft Windows 5.1.2600 (1.7.12)

Z:\home\wine\newstart>PATH=Z:\home\wine\newstart\MSYS2-20140205\bin;%PATH%
Z:\home\wine\newstart>MSYS2-20140205\bin\strace.exe
MSYS2-0140205\bin\mintty.exe > strace.log
1069046 [main] mintty 44 cygwin_exception::open_stackdumpfile: Dumping stack
trace to mintty.exe.stackdump

The mintty terminal momentarily appeared before the stackdump occurred.  After
that stack dump strace did not return (i.e., everything was hung), and the last
line in strace.log at that point was

  616 1255194 [main] mintty 44 pinfo::exit: Calling ExitProcess n 0x8B,
exitcode 0x8B00

I exited the combination of mintty, strace, cmd, and wineconsole the
brute-force way by typing "wineserver -k" in a different Linux xterm which
added nothing else to strace.log.

The strace and stackdump results for patched wine-1.6.1 and patched wine-1.7.12
were virtually identical (except for numerical data like PID numbers).  I have
attached the wine-1.7.12 versions.

When initially investigating this issue I was using unpatched wine-1.6.1.  The
result of everything I tried was Wine error boxes concerning dll problems. 
Those error boxes reminded me very much of my troubles in trying to run modern
Cygwin from Wine so I applied the APC-related patch, and sure enough, that got
rid of the error boxes, and I could get a lot further before I ran into a
different problem which is what I have described above.

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