[Bug 34813] New: winedbg crash reports are missing important information on Mac OS X 10.8+

http://bugs.winehq.org/show_bug.cgi?id=34813

Bug #: 34813
           Summary: winedbg crash reports are missing important
                    information on Mac OS X 10.8+
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dbghelp
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

For an example, see attachment 46421 from bug 34811.

Built-in DLLs are shown as PE modules instead of ELF wrappers around PE
modules.

The address ranges for the modules are likely incorrect.  Many of them are
shown as taking 4 pages (16KB) when I'm sure they're much larger.  For example,
gdi32.

As a consequence, none of the stack frames resolve to symbols/functions.  Few
of them even resolve to modules other than "<wine-loader>".

I believe this only affects OS X 10.8 and later.  It doesn't affect 10.6.8.  I
suspect it has to do with image sliding.

[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

http://bugs.winehq.org/show_bug.cgi?id=34813

Austin English  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

http://bugs.winehq.org/show_bug.cgi?id=34813

--- Comment #1 from Ken Thomases  2013-10-28 20:48:54 CDT ---
The problem is Address Space Layout Randomization (ASLR).  Dyld is being loaded
into a random address in the process, which invalidates an assumption made in
dlls/dbghelp/macho_module.c:macho_load_file().  That assumes that the address
of the symbol "_dyld_all_image_infos" in /usr/lib/dyld is where the dynamic
loader image info will be found in all processes.

In the presence of ASLR, it's difficult to find where that dyld info really is.

The only viable approach I've found is to use Mach's task_info() function with
the TASK_DYLD_INFO flavor.  This requires that the caller have the debuggee's
Mach task port name.  A task can obtain its own task port name, but to obtain
the task port name of another task requires privileges.  Wine processes do send
their task port to the wineserver at startup, though.  So, it would be possible
for the debugger to request that the wineserver obtain the debuggee's dyld info
and return it.

(The TASK_DYLD_INFO flavor isn't declared in the 10.5 SDK, so we may need to
keep the existing approach as a fallback until we abandon support for 10.5.)

[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

http://bugs.winehq.org/show_bug.cgi?id=34813

Ken Thomases  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch

--- Comment #2 from Ken Thomases  2013-12-04 16:12:43 CST ---
I have submitted patches to fix this:
http://source.winehq.org/patches/data/100877
http://source.winehq.org/patches/data/100878

[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

http://bugs.winehq.org/show_bug.cgi?id=34813

Ken Thomases  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
      Fixed by SHA1|                            |1577fb6c3f5941a9b2ba1fec7e3
                   |                            |8e61cdfa2b757
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Ken Thomases  2013-12-05 13:25:32 CST ---
Fixed by
http://source.winehq.org/git/wine.git/?a=commit;h=1577fb6c3f5941a9b2ba1fec7e...

[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

http://bugs.winehq.org/show_bug.cgi?id=34813

Alexandre Julliard  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #4 from Alexandre Julliard  2013-12-06 13:44:23 CST ---
Closing bugs fixed in 1.7.8.

[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

https://bugs.winehq.org/show_bug.cgi?id=34813

Alexandre Julliard  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |1.6.x

[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

https://bugs.winehq.org/show_bug.cgi?id=34813

Alexandre Julliard  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|1.6.x                       |---

--- Comment #5 from Alexandre Julliard  ---
Removing 1.6.x milestone from bugs included in 1.6.2.