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digitalmars.D.bugs - [Issue 4185] New: Existence of an empty, uncalled function that takes an argument generates segfaulting executable.

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           Summary: Existence of an empty, uncalled function that takes an
                    argument generates segfaulting executable.
           Product: D
           Version: 2.041
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: blood.of.life gmail.com


--- Comment #0 from Bernard Helyer <blood.of.life gmail.com> 2010-05-13
17:01:02 PDT ---
void* bar;
    void foo(void*) {}
    void baz() { foo(bar); }
    void main() {}

This code causes DMD to produce an executable that segfaults inside of
GC.collect.

    (gdb) bt
    #0  0x08050aa2 in
_D4core6thread17thread_suspendAllUZv7suspendMFC4core6thread6ThreadZv ()
    #1  0x08050a1b in thread_suspendAll ()
    #2  0x0804decd in _D2gc3gcx3Gcx11fullcollectMFPvZk ()
    #3  0x0804deae in _D2gc3gcx3Gcx16fullcollectshellMFZk ()
    #4  0x0804d115 in _D2gc3gcx2GC18fullCollectNoStackMFZv ()
    #5  0x0804bd20 in gc_term ()
    #6  0x0804a9b0 in _D2rt6dmain24mainUiPPaZi6runAllMFZv ()
    #7  0x0804a8b9 in _D2rt6dmain24mainUiPPaZi7tryExecMFMDFZvZv ()
    #8  0x0804a868 in main ()

However, in the course of boiling down a test case, the segfault has moved
around with great regularity (inside of a library SO, inside of libc.exit,
whilst appending to an array, the list goes on), so I'm speculating that it's
some kind of memory corruption. 

This occurs on Linux using D2, neither D1 nor Windows using D1,D2 manifests
this issue.

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Bernard Helyer <blood.of.life gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Existence of an empty,      |Existence of an empty,
                   |uncalled function that      |uncalled function that
                   |takes an argument generates |takes an argument generates
                   |segfaulting executable.     |segfaulting executable
                   |                            |using DMD >= 2.044.


--- Comment #1 from Bernard Helyer <blood.of.life gmail.com> 2010-05-13
17:02:29 PDT ---
I forgot to say that this issue occurs when using DMD 2.044 and up.

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--- Comment #2 from Bernard Helyer <blood.of.life gmail.com> 2010-05-14
03:58:06 PDT ---
If bar is declared as __gshared, the executable behaves correctly.

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Steven Schveighoffer <schveiguy yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |schveiguy yahoo.com


--- Comment #3 from Steven Schveighoffer <schveiguy yahoo.com> 2010-05-14
04:58:16 PDT ---
I can't reproduce this on Linux 2.045 and the current beta.  Can you try a
clean install of the compiler?

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--- Comment #4 from Bernard Helyer <blood.of.life gmail.com> 2010-05-14
05:07:13 PDT ---
Yep.

What arch are you on? How much memory do you have installed (myself == x86, 1.5
GiB). Like I said, I think this is memory corruption of some description, so
it's bound to be nebulous.

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--- Comment #5 from Steven Schveighoffer <schveiguy yahoo.com> 2010-05-14
05:10:31 PDT ---
I'm on x86 1 Gb.

What flags do you pass to the compiler?

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--- Comment #6 from Bernard Helyer <blood.of.life gmail.com> 2010-05-14
05:13:33 PDT ---
None: dmd testmodule

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--- Comment #7 from Bernard Helyer <blood.of.life gmail.com> 2010-05-14
05:14:16 PDT ---
Steve, could you run it in valgrind?

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--- Comment #8 from Bernard Helyer <blood.of.life gmail.com> 2010-05-14
05:14:37 PDT ---
Steven, sorry. :o

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Bernard Helyer <blood.of.life gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID
            Summary|Existence of an empty,      |Existence of an empty,
                   |uncalled function that      |uncalled function that
                   |takes a TLS variable as its |takes a TLS variable as its
                   |parameter generates         |parameter generates
                   |segfaulting executable      |segfaulting executable
                   |using DMD >= 2.044.         |using DMD >= 2.044 and the
                   |                            |GOLD linker.


--- Comment #9 from Bernard Helyer <blood.of.life gmail.com> 2010-05-14
23:14:52 PDT ---
Okay, this only occurs when the GNU GOLD linker is installed instead of the
vanilla. This could be a bug in DMD, but it's probably GOLD, so closing this as
INVALID.

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