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digitalmars.D.bugs - [Issue 7986] New: segfault in rt.lifetime.__doPostblit on array of struct

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7986

           Summary: segfault in rt.lifetime.__doPostblit on array of
                    struct
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: druntime
        AssignedTo: nobody puremagic.com
        ReportedBy: ricochet1k gmail.com


--- Comment #0 from Matt Peterson <ricochet1k gmail.com> 2012-04-25 21:58:56
PDT ---
Using DMD v2.060 git 900c537038932435eaebdf7c0f80926e0bd8f2f5

postblitbug.d
----

struct X {}

void main() {
    X[] xs;
    xs ~= [X()];
}

----
gdb backtrace:

#0  0x0000000000000001 in ?? ()
#1  0x000000000041ef10 in rt.lifetime.__doPostblit() (ti=0x630550, len=1, 
    ptr=0x7ffff7ec5fe0) at src/rt/lifetime.d:589
#2  0x00000000004162dc in _d_arrayappendT (ti=0x7ffff7ec5fe0, x=0x429620,
y=...)
    at src/rt/lifetime.d:1611
#3  0x00000000004149fa in D main ()

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next sibling parent d-bugmail puremagic.com writes:
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Steven Schveighoffer <schveiguy yahoo.com> changed:

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


--- Comment #1 from Steven Schveighoffer <schveiguy yahoo.com> 2012-04-26
06:41:12 PDT ---
Does not happen on Linux 32-bit DMD 2.059.

Looking at the code, it should not be calling postblit (line 589) on this
struct, since it doesn't define a specific postblit.  The call should have
short-circuited before that.

I suspect an issue with the TypeInfo generation, or with corruption.  I haven't
yet duplicated it, so it could be something else altogether.  The TypeInfo
layout did change recently to accommodate the RTInfo member, could that have
something to do with it?

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Matt Peterson <ricochet1k gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Platform|All                         |x86_64


--- Comment #2 from Matt Peterson <ricochet1k gmail.com> 2012-04-26 09:47:31
PDT ---
Good to know. I'm on Linux 64-bit.

I just tested: the segfault still occurs even with a specific postblit and/or
members added to the struct.

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--- Comment #3 from Steven Schveighoffer <schveiguy yahoo.com> 2012-04-26
10:03:28 PDT ---
Can you test with 2.059?

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--- Comment #4 from Matt Peterson <ricochet1k gmail.com> 2012-04-26 10:09:24
PDT ---
Yes, it works on 2.059, and it worked a few revisions ago. I'll try to do a git
bisect later today or tomorrow to find which revision broke it.

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Matt Peterson <ricochet1k gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|druntime                    |DMD


--- Comment #5 from Matt Peterson <ricochet1k gmail.com> 2012-04-27 01:05:01
PDT ---
(In reply to comment #1)

 I suspect an issue with the TypeInfo generation, or with corruption.  I haven't
 yet duplicated it, so it could be something else altogether.  The TypeInfo
 layout did change recently to accommodate the RTInfo member, could that have
 something to do with it?


Exactly right. The bad commit is "add GCInfo"
(https://github.com/ricochet1k/dmd/commit/31f974a03de4372a7f95801b3e4f5a09f052ee1e)

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dawg dawgfoto.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dawg dawgfoto.de


--- Comment #6 from dawg dawgfoto.de 2012-04-27 10:10:24 PDT ---
Try to update/rebuild your druntime lib and all linked D objects.
The removal of xGetMembers has created a binary incompatibility.

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Matt Peterson <ricochet1k gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #7 from Matt Peterson <ricochet1k gmail.com> 2012-04-27 10:23:52
PDT ---
(In reply to comment #6)

 Try to update/rebuild your druntime lib and all linked D objects.
 The removal of xGetMembers has created a binary incompatibility.


Gah, you're right. I assumed that because Phobos automatically builds druntime
that it would automatically clean it as well. There are tons of problems with
the makefiles that really should be fixed.

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