[Bug c++/67055] New: Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[Bug c++/67055] New: Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[balder@yahoo-inc.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

            Bug ID: 67055
           Summary: Segmentation fault in fold_builtin_alloca_with_align
                    in tree-ssa-ccp.c
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: balder@yahoo-inc.com
  Target Milestone: ---

Created attachment 36087
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36087&action=edit
This is the full output from the build with stdout and stdin redirected to
file.

When upgrading our compiler version from 4.9.3 to 5.2.0 our build fails with
following message.

....
....
In file included from mallocdst16.cpp:31:0:
../../vespamalloc/malloc/overload.h: In function ‘void* operator
new(std::size_t, const std::nothrow_t&)’:
../../vespamalloc/malloc/overload.h:41:7: internal compiler error: Segmentation
fault
 void* operator new(std::size_t sz, const std::nothrow_t&) noexcept {
       ^
0xa34c65 crash_signal
        ../.././gcc/toplev.c:383
0xaf7486 fold_builtin_alloca_with_align
        ../.././gcc/tree-ssa-ccp.c:2066
0xaf7486 ccp_fold_stmt
        ../.././gcc/tree-ssa-ccp.c:2172
0xb6738a substitute_and_fold_dom_walker::before_dom_children(basic_block_def*)
        ../.././gcc/tree-ssa-propagate.c:1176
0xfcdd3a dom_walker::walk(basic_block_def*)
        ../.././gcc/domwalk.c:188
0xb65a1b substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool)
        ../.././gcc/tree-ssa-propagate.c:1272
0xaf196b ccp_finalize
        ../.././gcc/tree-ssa-ccp.c:941
0xaf2adf do_ssa_ccp
        ../.././gcc/tree-ssa-ccp.c:2382
0xaf2adf execute
        ../.././gcc/tree-ssa-ccp.c:2414
Please submit a full bug report,
...
...
>From gcc-bugs-return-493638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jul 29 10:51:59 2015
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Subject: [Bug lto/66752] spec2000 255.vortex performance compiled with GCC is ~20% lower than with CLANG
Date: Wed, 29 Jul 2015 10:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf752

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

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

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Reopen.

[Bug c++/67055] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-07-29
                 CC|                            |trippels at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Please attach the preprocessed mallocdst16.ii file.

[Bug c++/67055] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[balder@yahoo-inc.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

--- Comment #2 from Henning Baldersheim <balder@yahoo-inc.com> ---
Created attachment 36088
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36088&action=edit
the .ii file in gziped format

[Bug c++/67055] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[balder@yahoo-inc.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

--- Comment #3 from Henning Baldersheim <balder@yahoo-inc.com> ---
Created attachment 36089
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36089&action=edit
.s file

I also add the .s file that was generated with the -save-temps option

[Bug c++/67055] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[balder@yahoo-inc.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

--- Comment #4 from Henning Baldersheim <balder@yahoo-inc.com> ---
If I use -O2 instead of -O3 it builds fine.

[Bug tree-optimization/67055] 5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
          Component|c++                         |tree-optimization
            Summary|Segmentation fault in       |5/6 Regression]
                   |fold_builtin_alloca_with_al |Segmentation fault in
                   |ign in tree-ssa-ccp.c       |fold_builtin_alloca_with_al
                   |                            |ign in tree-ssa-ccp.c
           Severity|major                       |normal

--- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
trippels@gcc75 ~ % cat mallocdst16.ii
namespace std {
typedef long unsigned size_t;
struct nothrow_t;
}
namespace vespamalloc {
void fn1(void *);
template <typename> class A {
public:
  static unsigned long fillStack(unsigned long);
};
template <typename StackRep>
unsigned long A<StackRep>::fillStack(unsigned long p1) {
  void *retAddr[p1];
  fn1(retAddr);
}
class B {
protected:
  B(void *);
};
template <int StackTraceLen> class D : B {
public:
  D() : B(0) {}
  void alloc(int) { A<int>::fillStack(StackTraceLen); }
};
template <typename, typename> class C {
public:
  void *malloc(unsigned long);
};
template <typename MemBlockPtrT, typename ThreadListT>
void *C<MemBlockPtrT, ThreadListT>::malloc(unsigned long) {
  MemBlockPtrT mem;
  mem.alloc(0);
}
C<D<16>, int> *_GmemP;
}
void *operator new(std::size_t, std::nothrow_t &) noexcept {
  return vespamalloc::_GmemP->malloc(0);
}
void *operator new[](std::size_t, std::nothrow_t &) noexcept {
  return vespamalloc::_GmemP->malloc(0);
}

trippels@gcc75 ~ % g++ -std=c++14 -O3 -c mallocdst16.ii
mallocdst16.ii: In function ?void* operator new(std::size_t, std::nothrow_t&)?:
mallocdst16.ii:36:7: internal compiler error: Segmentation fault

[Bug tree-optimization/67055] [5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
                 CC|                            |hubicka at gcc dot gnu.org

--- Comment #7 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Started with r65150.

[Bug tree-optimization/67055] [5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

--- Comment #8 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Actually, it started with r221040 aka PR bootstrap/65150 fix.

[Bug tree-optimization/67055] [5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org
   Target Milestone|---                         |5.3

[Bug tree-optimization/67055] [5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[hp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

Hans-Peter Nilsson <hp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hp at gcc dot gnu.org

--- Comment #9 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
Created attachment 36130
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36130&action=edit
rcutorture.c reduced, compile with -O2.

Everybody loves a C test-case.  This one will expose the same message for at
least cris-elf at -O2, so I presume it is the same bug.  Observed for r226568.

The attached file is reduced from kernel/rcu/rcutorture.c
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git tag
next-20150720 compiling for cris-linux, but with the reduced code edited to
avoid warnings.

Thanks to Chen Gang for the initial report.

[Bug tree-optimization/67055] [5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
2118      threshold = (unsigned HOST_WIDE_INT)PARAM_VALUE
(PARAM_LARGE_STACK_FRAME);
2119      /* In case the alloca is located at function entry, it has the same
lifetime
2120         as a declared array, so we allow a larger size.  */
2121      block = gimple_block (stmt);
2122      if (!(cfun->after_inlining
2123            && TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL))
2124        threshold /= 10;
2125      if (size > threshold)
2126        return NULL_TREE;
2127
(gdb) p stmt
$2 = <gimple_call 0x7ffff6a57d80>
(gdb) p debug_gimple_stmt (stmt)
# .MEM_11 = VDEF <.MEM_10>
retAddr.2_7 = __builtin_alloca_with_align (128, 64);
$3 = void

so the fix looks obvious (well, in case the alloca_with_align really is
supposed to have no BLOCK which looks pessimizing).

Looks like we've come the

      if (gimple_block (stmt))
        {
... remap block tree ...
        }
      else
        remap_blocks_to_null (DECL_INITIAL (fn), id);

path during inlining.  So the call we inline wasn't associated with any BLOCK.
That's

retval.11_5 = operator new [] (_2(D), _3(D)); [tail call]

which is created from cgraph_node::expand_thunk.  Indeed thunks do not have
any associated BLOCK.

Testing fix.

[Bug tree-optimization/67055] [5 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[5/6 Regression]            |[5 Regression] Segmentation
                   |Segmentation fault in       |fault in
                   |fold_builtin_alloca_with_al |fold_builtin_alloca_with_al
                   |ign in tree-ssa-ccp.c       |ign in tree-ssa-ccp.c

--- Comment #13 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Another testcase:

trippels@gcc2-power8 ~ % cat syn.i
struct list_head
{
  struct list_head *prev;
};
extern void __wait_rcu_gp (void*);
const int a = sizeof 0;
static inline __attribute__ ((always_inline no_instrument_function)) void
rcu_barrier_sched (void)
{
  struct list_head b[a];
  __wait_rcu_gp (b);
}

static inline __attribute__ ((always_inline no_instrument_function)) void
rcu_barrier (void)
{
  rcu_barrier_sched ();
}

struct
{
  void *wait;
} c[] = { rcu_barrier, rcu_barrier_sched };

trippels@gcc2-power8 ~ % /home/trippels/gcc_5/usr/local/bin/gcc -c -O2 syn.i
syn.i: In function ‘rcu_barrier_sched’:
syn.i:8:1: internal compiler error: Segmentation fault
 rcu_barrier_sched (void)
 ^
0x107e9053 crash_signal
        ../../gcc/gcc/toplev.c:383
0x10937a64 tree_check
        ../../gcc/gcc/tree.h:2850
0x10937a64 fold_builtin_alloca_with_align
        ../../gcc/gcc/tree-ssa-ccp.c:2067
0x10937a64 ccp_fold_stmt
        ../../gcc/gcc/tree-ssa-ccp.c:2172
0x109d85a3
substitute_and_fold_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/gcc/tree-ssa-propagate.c:1177
0x10dd228b dom_walker::walk(basic_block_def*)
        ../../gcc/gcc/domwalk.c:188
0x109d7993 substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool)
        ../../gcc/gcc/tree-ssa-propagate.c:1272
0x1092f0eb ccp_finalize
        ../../gcc/gcc/tree-ssa-ccp.c:941
0x1092f0eb do_ssa_ccp
        ../../gcc/gcc/tree-ssa-ccp.c:2382
0x1092f0eb execute
        ../../gcc/gcc/tree-ssa-ccp.c:2414
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
>From gcc-bugs-return-495576-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 25 07:41:12 2015
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Subject: [Bug tree-optimization/67055] [5/6 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg055

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ysato at users dot sourceforge.jp

--- Comment #12 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
*** Bug 67349 has been marked as a duplicate of this bug. ***

[Bug tree-optimization/67055] [5 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

--- Comment #14 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Still happens on gcc-5 branch. 
(This breaks building the Linux kernel with -O3 with my config)
-fno-ipa-icf "fixes" the issue.

[Bug tree-optimization/67055] [5 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
      Known to fail|                            |5.2.0

--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.

[Bug tree-optimization/67055] [5 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Sep 21 09:55:57 2015
New Revision: 227961

URL: https://gcc.gnu.org/viewcvs?rev=227961&root=gcc&view=rev
Log:
2015-09-21  Richard Biener  <rguenther@suse.de>

        Backport from mainline
        2015-07-08  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/66793
        * gimple-ssa-isolate-paths.c
(insert_trap_and_remove_trailing_statemen):
        Properly split the block after stmts ending it.

        * gcc.dg/torture/pr66793.c: New testcase.

        2015-08-05  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/67055
        * tree-ssa-ccp.c (fold_builtin_alloca_with_align): Handle
        NULL gimple_block.

        * g++.dg/torture/pr67055.C: New testcase.

        2015-08-05  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/67121
        * tree-if-conv.c (combine_blocks): Clear range-info produced
        by stmts no longer executed conditionally.

        * gcc.dg/torture/pr67121.c: New testcase.

        2015-09-16  Richard Biener  <rguenther@suse.de>

        PR middle-end/67271
        * fold-const.c (native_encode_expr): Bail out on bogus offsets.

        * gcc.dg/pr67271.c: New testcase.

        2015-07-22  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/66952
        * tree-ssa-ifcombine.c (pass_tree_ifcombine::execute): For
        blocks we end up executing unconditionally reset all SSA
        info such as range and alignment.
        * tree-ssanames.h (reset_flow_sensitive_info): Declare.
        * tree-ssanames.c (reset_flow_sensitive_info): New function.

        * gcc.dg/torture/pr66952.c: New testcase.

        2015-09-15  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/67470
        * tree-ssa-loop-im.c (execute_sm_if_changed): Preserve PHI
        structure for PHI hoisting by inserting a forwarder block
        if appropriate.

        * gcc.dg/torture/pr67470.c: New testcase.

Added:
    branches/gcc-5-branch/gcc/testsuite/g++.dg/torture/pr67055.C
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/pr67271.c
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr66793.c
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr66952.c
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr67121.c
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr67470.c
Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/fold-const.c
    branches/gcc-5-branch/gcc/gimple-ssa-isolate-paths.c
    branches/gcc-5-branch/gcc/testsuite/ChangeLog
    branches/gcc-5-branch/gcc/tree-if-conv.c
    branches/gcc-5-branch/gcc/tree-ssa-ccp.c
    branches/gcc-5-branch/gcc/tree-ssa-ifcombine.c
    branches/gcc-5-branch/gcc/tree-ssa-loop-im.c
    branches/gcc-5-branch/gcc/tree-ssanames.c
    branches/gcc-5-branch/gcc/tree-ssanames.h

[Bug tree-optimization/67055] [5 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

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

--- Comment #17 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
*** Bug 67659 has been marked as a duplicate of this bug. ***

[Bug tree-optimization/67055] [5 Regression] Segmentation fault in fold_builtin_alloca_with_align in tree-ssa-ccp.c

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gcc-bugs at zahlenfresser dot de

--- Comment #18 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
*** Bug 67908 has been marked as a duplicate of this bug. ***