[Bug fortran/65766] New: gFortran Compiler SEGFAULTING on compiling simple program

[Bug fortran/65766] New: gFortran Compiler SEGFAULTING on compiling simple program

[giorgianb at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

            Bug ID: 65766
           Summary: gFortran Compiler SEGFAULTING on compiling simple
                    program
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: giorgianb at gmail dot com

Created attachment 35315
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35315&action=edit
Program that leads to gfortran SEGFAULTING

The problem is that when using gfortran to compile a simple program
(the source code for the program is attached) on the Raspberry Pi 2,
the compiler crashes, giving this error message:

bash-4.2$ gfortran-4.9 7.f95
f951: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions.

Some version info from gfortran-4.9:

bash-4.2$ gfortran-4.9 --version
GNU Fortran (Raspbian 4.9.2-10) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.

GNU Fortran comes with NO WARRANTY, to the extent permitted by law.
You may redistribute copies of GNU Fortran
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPY

Running the program uname -a to give some info:

bash-4.2$ uname -a
Linux raspberrypi 3.18.10-v7+ #774 SMP PREEMPT Wed Mar 25 14:10:30 GMT
2015 armv7l GNU/Linux

Running gfortran-4.9 in valgrind hints to an unsupported system call:

bash-4.2$ valgrind gfortran-4.9 7.f95
==5539== Memcheck, a memory error detector
==5539== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==5539== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==5539== Command: gfortran-4.9 7.f95
==5539==
--5539-- WARNING: unhandled syscall: 369
--5539-- You may be able to write your own handler.
--5539-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--5539-- Nevertheless we consider this a bug.  Please report
--5539-- it at http://valgrind.org/support/bug_reports.html.
--5539-- WARNING: unhandled syscall: 369
--5539-- You may be able to write your own handler.
--5539-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--5539-- Nevertheless we consider this a bug.  Please report
--5539-- it at http://valgrind.org/support/bug_reports.html.
f951: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions.
==5539==
==5539== HEAP SUMMARY:
==5539==     in use at exit: 41,873 bytes in 89 blocks
==5539==   total heap usage: 218 allocs, 129 frees, 52,452 bytes allocated
==5539==
==5539== LEAK SUMMARY:
==5539==    definitely lost: 5,337 bytes in 34 blocks
==5539==    indirectly lost: 16 bytes in 1 blocks
==5539==      possibly lost: 0 bytes in 0 blocks
==5539==    still reachable: 36,520 bytes in 54 blocks
==5539==         suppressed: 0 bytes in 0 blocks
==5539== Rerun with --leak-check=full to see details of leaked memory
==5539==
==5539== For counts of detected and suppressed errors, rerun with: -v
==5539== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

Thank you for your time. I appreciate the GNU community's effort into
producing good compilers.

Giorgian

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-04-15
                 CC|                            |jvdelisle at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
The problem is related to these lines:

--- snip ---
 str%elems(1:) = charvar(1:)
--- snip ---
 charvar(1:) = str%elems(1:)
--- snip ---

On my system with trunk I get:

$ gfc 7.f90

f951: out of memory allocating 26154014304 bytes after a total of 569344 bytes

I have ulimits set  ... to infinity and beyond!

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[t56xjcu6dh at snkmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

Louis Krupp <t56xjcu6dh at snkmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |t56xjcu6dh at snkmail dot com

--- Comment #2 from Louis Krupp <t56xjcu6dh at snkmail dot com> ---
Created attachment 36079
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36079&action=edit
Program to demonstrate the bug and test a patch

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[t56xjcu6dh at snkmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

--- Comment #3 from Louis Krupp <t56xjcu6dh at snkmail dot com> ---
Created attachment 36080
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36080&action=edit
Proposed patch

The problem is with substrings of allocatable string components of derived
types.  The code seems to be trying to get the string length from typespec of
the derived type variable instead of from the component.

The attached patch gets the component typespec from the reference chain.

I don't understand the code well enough to have a lot of confidence in this
patch, but it seems like a step in the right direction.

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The patch in comment 3 fixes the PR without regression, as well as pr61676,
pr63494, and  pr66562 (duplicates?).

Note that patches should be posted to gcc-patches@gcc.gnu.org and for gfortran
to fortran@gcc.gnu.org with the change log entry.

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Fixed by the patch at https://gcc.gnu.org/ml/fortran/2015-07/msg00166.html.

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ian.thompson at liv dot ac.uk

--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 61676 has been marked as a duplicate of this bug. ***

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jwmwalrus at gmail dot com

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 63494 has been marked as a duplicate of this bug. ***

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[lkrupp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

--- Comment #8 from lkrupp at gcc dot gnu.org ---
Author: lkrupp
Date: Tue Oct  6 23:47:18 2015
New Revision: 228551

URL: https://gcc.gnu.org/viewcvs?rev=228551&root=gcc&view=rev
Log:
2015-10-06  Louis Krupp <louis.krupp@zoho.com>
        PR fortran/65766
        * resolve.c (gfc_resolve_substring_charlen): For derived type,
        use typespec of string component when resolving substring length.

2015-10-06  Louis Krupp     <louis.krupp@zoho.com>

        PR fortran/65766
        * gfortran.dg/substr_alloc_string_comp_1.f90: New.

Modified:
    trunk/gcc/fortran/ChangeLog
    trunk/gcc/fortran/resolve.c
    trunk/gcc/testsuite/ChangeLog

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[lkrupp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

lkrupp at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |lkrupp at gcc dot gnu.org
         Resolution|---                         |FIXED

--- Comment #9 from lkrupp at gcc dot gnu.org ---
Fixed on the trunk.  Thanks for the report!

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> 2015-10-06  Louis Krupp     <louis.krupp@zoho.com>
>
>	PR fortran/65766
>	* gfortran.dg/substr_alloc_string_comp_1.f90: New.

AFAICT the test has not been committed.
>From gcc-bugs-return-498931-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 07 07:56:00 2015
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Subject: [Bug tree-optimization/67879] unnecessary jump in ternary
Date: Wed, 07 Oct 2015 07:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg879

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-10-07
          Component|c                           |tree-optimization
            Version|unknown                     |5.2.0
         Depends on|                            |23286
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
With GCC 5 at -O2 it's

_Z1fiiPi:
.LFB0:
        .cfi_startproc
        cmpl    %esi, %edi
        movl    (%rdx), %eax
        jl      .L5
        addl    $1, %eax
        ret
        .p2align 4,,10
        .p2align 3
.L5:
        rep ret

vs.

_Z2f2iiPi:
.LFB1:
        .cfi_startproc
        xorl    %eax, %eax
        cmpl    %esi, %edi
        setge   %al
        addl    (%rdx), %eax
        ret

where f2 is already in if-converted form on the GIMPLE level:

int f2(int, int, int*) (int a, int b, int * c)
{
  int _6;
  int _7;
  bool _8;
  int _9;

  <bb 2>:
  _6 = *c_5(D);
  _8 = a_2(D) >= b_3(D);
  _9 = (int) _8;
  _7 = _6 + _9;
  return _7;

The reason why we are not if-converting f on the GIMPLE level is
the lack of a code hoisting pass and thus we have

  <bb 2>:
  if (a_2(D) < b_3(D))
    goto <bb 3>;
  else
    goto <bb 4>;

  <bb 3>:
  iftmp.0_6 = *c_5(D);
  goto <bb 5>;

  <bb 4>:
  _7 = *c_5(D);
  iftmp.0_8 = _7 + 1;

  <bb 5>:
  # iftmp.0_1 = PHI <iftmp.0_6(3), iftmp.0_8(4)>

which "confuses" phiopt enough.  Only RTL hoists the loads (in 261r.mach?).

PR23286 tracks the lack of code hoisting on GIMPLE.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id#286
[Bug 23286] Missed code hoisting optimization

[Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program

[louis.krupp at zoho dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

--- Comment #11 from louis.krupp at zoho dot com ---
Dominique,

Vous avez raison;  j'en suis désolé.  Je viens de le faire.

Louis

---- On Wed, 07 Oct 2015 00:47:39 -0700 dominiq at lps dot ens.fr  wrote ---- 
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766 
> 
>--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- 
>> 2015-10-06 Louis Krupp <louis.krupp@zoho.com> 
>> 
>>    PR fortran/65766 
>>    * gfortran.dg/substr_alloc_string_comp_1.f90: New. 
> 
>AFAICT the test has not been committed. 
> 
>-- 
>You are receiving this mail because: 
>You are on the CC list for the bug.
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Subject: [Bug fortran/65766] gFortran Compiler SEGFAULTING on compiling simple program
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65766

--- Comment #12 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Vous avez raison;  j'en suis désolé.  Je viens de le faire.

No problem! Thanks.
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Subject: [Bug c++/40752] -Wconversion generates false warnings for operands not larger than target type
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40752

Marcin Ślusarz <marcin.slusarz at intel dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marcin.slusarz at intel dot com

--- Comment #28 from Marcin Ślusarz <marcin.slusarz at intel dot com> ---
*** Bug 67764 has been marked as a duplicate of this bug. ***
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Subject: [Bug c/67764] -Wconversion generates false warnings for bitmask+cast expressions
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67764

Marcin Ślusarz <marcin.slusarz at intel dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #5 from Marcin Ślusarz <marcin.slusarz at intel dot com> ---
Heh, I took a closer look and this bug indeed is a duplicate. -Wconversion is
quite useless in its current form.

*** This bug has been marked as a duplicate of bug 40752 ***
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Subject: [Bug c/67764] -Wconversion generates false warnings for bitmask+cast expressions
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67764

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |manu at gcc dot gnu.org

--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Marcin Ślusarz from comment #5)
> Heh, I took a closer look and this bug indeed is a duplicate. -Wconversion
> is quite useless in its current form.
> 
> *** This bug has been marked as a duplicate of bug 40752 ***

Being the main author of Wconversion, I do agree with this sentiment. You'll
see there is a patch there to alleviate this issue, but I couldn't manage to
get it approved and now I don't have the time to invest on this issue. If you
want to see this fixed, your best option is to adopt the patch, update it, test
it and try to get it approved. Comparisons with how Clang and other compilers
behave would be useful but they should not be the basis of your argumentation.
When arguing for a change, try to be smart and see the point of view of the
other side and address that convincingly.
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Subject: [Bug libstdc++/67843] experimental/filesystem/iterators/directory_iterator.cc fails on armv5t
Date: Wed, 07 Oct 2015 10:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg843

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Running this under valgrind I see 900+ errors, the first 100 seem to be from
the global strings in the libstdc++-v3/testsuite/util/testsuite_fs.h file (I
think).

All the errors are basically nonsense, reporting errors in getpid() and
mkstemp() and things that are very unlikely to be broken, so either that
executable is horribly miscompiled or valgrind is useless with it.