[Bug 29378] New: Non-aligned pointer being freed (MacOS) seconds after an app exits

http://bugs.winehq.org/show_bug.cgi?id=29378

Bug #: 29378
           Summary: Non-aligned pointer being freed (MacOS) seconds after
                    an app exits
           Product: Wine
           Version: 1.3.26
          Platform: x86
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: wineserver
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

On MacOS, I observe random occurrences of
malloc: *** error for object 0x402086a0: Non-aligned pointer being freed (2)
*** set a breakpoint in malloc_error_break to debug
after an app exits.

A message like that has been mentioned in bug #28291, bug #22722 or bug #21655,
comment #4 and bug #28039, comment #6.  I don't know if the cause is always the
same.

I once thought it may be caused by audio but it's not.  It currently presents
itself as follows: the message appears a few seconds after an app (e.g.
winecfg) exits, thus I believe it's in the server (it might be one of the
services).  Not every call to winecfg terminates with that message.

Using WINEDEBUG=+coreaudio I observed that it can appear after winecfg even
when not clicking the audio tab, thus audio is loaded and not the cause.

Setting a breakpoint doesn't help:

macmini$ wine winedbg winecfg
WineDbg starting on pid 0024
0x7b852d7b _start_process+0x5b in kernel32: movl    %edi,0x4(%esp)
Wine-dbg>break malloc_error_break
Breakpoint 1 at 0x90d4e4ae malloc_error_break in libsystem.b.dylib
Wine-dbg>cont
fixme:msg:pack_message msg 14 (WM_ERASEBKGND) not supported yet
#... app exits normally
Invalid address (0x90d4e4ae malloc_error_break) for breakpoint 1, disabling it
Process of pid=0024 has terminated
#... app exited normally. Waiting a few seconds before typing:
Wine-dbg>cont
No process loaded, cannot execute 'cont'
#... still no message
Wine-dbg>quit
macmini$ 
#... a few seconds later:
wine(26283,0x4080c200) malloc: *** error for object 0x402086a0: Non-aligned
pointer being freed (2)
*** set a breakpoint in malloc_error_break to debug
wine(26283,0x4080c200) malloc: *** error for object 0x402085a0: Non-aligned
pointer being freed (2)
*** set a breakpoint in malloc_error_break to debug