[Bug 11840] New: Cygwin apps can't start up, fail creating a mailslot

http://bugs.winehq.org/show_bug.cgi?id=11840

Summary: Cygwin apps can't start up, fail creating a mailslot
           Product: Wine
           Version: CVS/GIT
          Platform: Other
               URL: http://cygwin.com
        OS/Version: other
            Status: NEW
          Keywords: download, Installer
          Severity: normal
          Priority: P2
         Component: ntdll
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Installing Cygwin with all defaults works fine up until it
tries to run the postinstall bash scripts.
When it fails, kill it, then just try to run bash; you'll
get the same error.  Here's a log; it shows a problem creating a
mailslot immediately before the crash.  Our current mailslot conformance
test doesn't test quite this kind of path, fwiw.

0009:Call KERNEL32.CreateFileA(61169e60
"\\.\mailslot\cygwin\dev\kmsg",40000000,00000007,61109448,00000003,00000000,00000000)
ret=6102f82c
trace:file:CreateFileW L"\\.\mailslot\cygwin\dev\kmsg" GENERIC_WRITE
FILE_SHARE_READ FILE_SHARE_WRITE FILE_SHARE_DELETE  creation 3 attributes 0x0
trace:file:RtlDosPathNameToNtPathName_U
(L"\\.\mailslot\cygwin\dev\kmsg",0x68afd0,(nil),(nil))
trace:file:RtlGetFullPathName_U (L"\\.\mailslot\cygwin\dev\kmsg" 520
0x68ad14 (nil))
trace:ntdll:NtCreateFile handle=0x68afd8 access=40000000
name=L"\??\mailslot\cygwin\dev\kmsg" objattr=00000042 root=(nil) sec=(nil)
io=0x68afc8 alloc_size=(nil)
attr=00000000 sharing=00000007 disp=1 options=00000050 ea=(nil).0x00000000
0009: open_file_object( access=40000000, attributes=00000042, rootdir=(nil),
sharing=00000007, options=00000050,
filename=L"\??\mailslot\cygwin\dev\kmsg" )
0009: open_file_object() = OBJECT_NAME_NOT_FOUND { handle=(nil) }
warn:file:CreateFileW Unable to create file
L"\\.\mailslot\cygwin\dev\kmsg" (status c0000034)
trace:file:CreateFileW returning 0xffffffff
0009:Ret  KERNEL32.CreateFileA() retval=ffffffff ret=6102f82c
...
trace:seh:raise_exception code=c0000005 flags=0 addr=0x61047509
...
1003758 [main] bash 8 _cygtls::handle_exceptions: Exception:
STATUS_ACCESS_VIOLATION
1011769 [main] bash 8 open_stackdumpfile: Dumping stack trace to
bash.exe.stackdump
1088615 [main] bash 8 _cygtls::handle_exceptions: Exception:
STATUS_ACCESS_VIOLATION
1090961 [main] bash 8 _cygtls::handle_exceptions: Error while dumping state
(probably corrupted stack)