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* [Bug middle-end/54629] New: [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608
@ 2012-09-19 18:40 burnus at gcc dot gnu.org
  2012-09-19 19:09 ` [Bug middle-end/54629] " burnus at gcc dot gnu.org
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: burnus at gcc dot gnu.org @ 2012-09-19 18:40 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54629

             Bug #: 54629
           Summary: [4.8 Regression] ICE (segfault) in index_in_loop_nest
                    tree-data-ref.h:608
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org


Seemingly, some noninitialized memory is now accessed. At least

  export MALLOC_PERTURB_=$(($RANDOM % 255 + 1))
  gfortran -O3 -fomit-frame-pointer -c gfortran.dg/array_assignment_1.F90

now gives an ICE (segfault) with the follow backtrace:


#0  0x00000000009d7c7c in index_in_loop_nest (loop_nest=0x1614460, var=1) at
/home/tob/projects/gcc-git/gcc/gcc/tree-data-ref.h:608
#1  classify_partition (partition=0x1602ef0, loop=0x2aaaac194660,
rdg=<optimized out>) at
/home/tob/projects/gcc-git/gcc/gcc/tree-loop-distribution.c:1039
#2  ldist_gen (starting_vertices=<optimized out>, rdg=0x164aa80,
loop=<optimized out>) at
/home/tob/projects/gcc-git/gcc/gcc/tree-loop-distribution.c:1308
#3  distribute_loop (stmts=<optimized out>, loop=<optimized out>) at
/home/tob/projects/gcc-git/gcc/gcc/tree-loop-distribution.c:1463
#4  tree_loop_distribution () at
/home/tob/projects/gcc-git/gcc/gcc/tree-loop-distribution.c:1531
#5  0x00000000008d940d in execute_one_pass (pass=pass@entry=0x14bd040
<pass_loop_distribution>) at /home/tob/projects/gcc-git/gcc/gcc/passes.c:2206
#6  0x00000000008d97c5 in execute_pass_list (pass=0x14bd040
<pass_loop_distribution>) at /home/tob/projects/gcc-git/gcc/gcc/passes.c:2261
#7  0x00000000008d97d7 in execute_pass_list (pass=0x14be080 <pass_tree_loop>)
at /home/tob/projects/gcc-git/gcc/gcc/passes.c:2262
#8  0x00000000008d97d7 in execute_pass_list (pass=0x14bb520
<pass_all_optimizations>) at /home/tob/projects/gcc-git/gcc/gcc/passes.c:2262
#9  0x00000000006e0118 in expand_function (node=0x2aaaac2a5ea0) at
/home/tob/projects/gcc-git/gcc/gcc/cgraphunit.c:1609
#10 0x00000000006e2002 in expand_all_functions () at
/home/tob/projects/gcc-git/gcc/gcc/cgraphunit.c:1714
#11 compile () at /home/tob/projects/gcc-git/gcc/gcc/cgraphunit.c:2012
#12 0x00000000006e25f5 in finalize_compilation_unit () at
/home/tob/projects/gcc-git/gcc/gcc/cgraphunit.c:2089


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug middle-end/54629] [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608
  2012-09-19 18:40 [Bug middle-end/54629] New: [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608 burnus at gcc dot gnu.org
@ 2012-09-19 19:09 ` burnus at gcc dot gnu.org
  2012-09-20  7:39 ` [Bug tree-optimization/54629] " jakub at gcc dot gnu.org
                   ` (3 subsequent siblings)
  4 siblings, 0 replies; 6+ messages in thread
From: burnus at gcc dot gnu.org @ 2012-09-19 19:09 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54629

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org
   Target Milestone|---                         |4.8.0

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-09-19 19:09:13 UTC ---
Caused by:

Author: rguenth
Date: Wed Sep 19 08:59:06 2012
New Revision: 191463

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191463
Log:
2012-09-19  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/54132
    * tree-loop-distribution.c (classify_partition): Properly
    check dependences for memmove.
    * tree-data-ref.h (compute_affine_dependence): Declare.
    * tree-data-ref.c (compute_affine_dependence): Export.


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug tree-optimization/54629] [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608
  2012-09-19 18:40 [Bug middle-end/54629] New: [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608 burnus at gcc dot gnu.org
  2012-09-19 19:09 ` [Bug middle-end/54629] " burnus at gcc dot gnu.org
@ 2012-09-20  7:39 ` jakub at gcc dot gnu.org
  2012-09-20  7:41 ` jakub at gcc dot gnu.org
                   ` (2 subsequent siblings)
  4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-09-20  7:39 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54629

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-09-20
                 CC|                            |jakub at gcc dot gnu.org
          Component|middle-end                  |tree-optimization
         AssignedTo|unassigned at gcc dot       |jakub at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug tree-optimization/54629] [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608
  2012-09-19 18:40 [Bug middle-end/54629] New: [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608 burnus at gcc dot gnu.org
  2012-09-19 19:09 ` [Bug middle-end/54629] " burnus at gcc dot gnu.org
  2012-09-20  7:39 ` [Bug tree-optimization/54629] " jakub at gcc dot gnu.org
@ 2012-09-20  7:41 ` jakub at gcc dot gnu.org
  2012-09-21 11:54 ` rguenth at gcc dot gnu.org
  2012-09-21 11:55 ` rguenth at gcc dot gnu.org
  4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-09-20  7:41 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54629

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-09-20 07:41:01 UTC ---
Created attachment 28225
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28225
gcc48-pr54629.patch

IMHO there are two issues - one is that the loop nest is freed too early,
before it is still used, and another one that on success the ddr isn't freed at
all, so we leak memory.


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug tree-optimization/54629] [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608
  2012-09-19 18:40 [Bug middle-end/54629] New: [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608 burnus at gcc dot gnu.org
                   ` (2 preceding siblings ...)
  2012-09-20  7:41 ` jakub at gcc dot gnu.org
@ 2012-09-21 11:54 ` rguenth at gcc dot gnu.org
  2012-09-21 11:55 ` rguenth at gcc dot gnu.org
  4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-09-21 11:54 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54629

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-21 11:54:19 UTC ---
Author: rguenth
Date: Fri Sep 21 11:54:14 2012
New Revision: 191611

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191611
Log:
2012-09-21  Jakub Jelinek  <jakub@redhat.com>

    PR tree-optimization/54629
    * tree-loop-distribution.c (classify_partition): Free loop nest only
    after freeing ddr.  Free ddr and loop nest also if successful.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-loop-distribution.c


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug tree-optimization/54629] [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608
  2012-09-19 18:40 [Bug middle-end/54629] New: [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608 burnus at gcc dot gnu.org
                   ` (3 preceding siblings ...)
  2012-09-21 11:54 ` rguenth at gcc dot gnu.org
@ 2012-09-21 11:55 ` rguenth at gcc dot gnu.org
  4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-09-21 11:55 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54629

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-21 11:55:24 UTC ---
Fixed.


^ permalink raw reply	[flat|nested] 6+ messages in thread
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2012-09-19 18:40 [Bug middle-end/54629] New: [4.8 Regression] ICE (segfault) in index_in_loop_nest tree-data-ref.h:608 burnus at gcc dot gnu.org
2012-09-19 19:09 ` [Bug middle-end/54629] " burnus at gcc dot gnu.org
2012-09-20  7:39 ` [Bug tree-optimization/54629] " jakub at gcc dot gnu.org
2012-09-20  7:41 ` jakub at gcc dot gnu.org
2012-09-21 11:54 ` rguenth at gcc dot gnu.org
2012-09-21 11:55 ` rguenth at gcc dot gnu.org

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