[Bug c/67908] New: gcc segfaults with -fstack-check (internal compiler error) / armv7 host and target

[Bug c/67908] New: gcc segfaults with -fstack-check (internal compiler error) / armv7 host and target

[gcc-bugs at zahlenfresser dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67908

            Bug ID: 67908
           Summary: gcc segfaults with -fstack-check (internal compiler
                    error) / armv7 host and target
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc-bugs at zahlenfresser dot de
  Target Milestone: ---

Created attachment 36471
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36471&action=edit
preprocessed source (part of retroarch)

gcc segfaults if a certain source is compiled w/ -fstack-check

/usr/bin/gcc -v -save-temps -fstack-check -march=armv7-a -mfloat-abi=hard
-mfpu=vfpv3-d16 -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -Wall -O3
-ffast-math  -g -std=gnu99 -Wno-unused-result -Wno-unused-variable -c -o test.o
test.c
gcc: warning: -pipe ignored because -save-temps specified
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
Target: armv7l-unknown-linux-gnueabihf
Configured with: /build/gcc/src/gcc-5.2.0/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info
--with-bugurl=https://github.com/archlinuxarm/PKGBUILDs/issues
--enable-languages=c,c++,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --with-system-zlib --with-isl --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-lto --enable-plugin --enable-install-libiberty
--with-linker-hash-style=gnu --enable-gnu-indirect-function --disable-multilib
--disable-werror --enable-checking=release
--with-default-libstdcxx-abi=gcc4-compatible
--host=armv7l-unknown-linux-gnueabihf --build=armv7l-unknown-linux-gnueabihf
--with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16
Thread model: posix
gcc version 5.2.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fstack-check=specific'
'-march=armv7-a' '-mfloat-abi=hard' '-mfpu=vfpv3-d16' '-O2' '-pipe'
'-fstack-protector' '--param' 'ssp-buffer-size=4' '-Wall' '-O3' '-ffast-math'
'-g' '-std=gnu99' '-Wno-unused-result' '-Wno-unused-variable' '-c' '-o'
'test.o' '-mtls-dialect=gnu'
 /usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.2.0/cc1 -E -quiet -v test.c
-march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16 -mtls-dialect=gnu -std=gnu99
-Wall -Wno-unused-result -Wno-unused-variable -fstack-check=specific
-fstack-protector -ffast-math -g -fworking-directory -O2 -O3 -fpch-preprocess
-o test.i
ignoring nonexistent directory
"/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.2.0/../../../../armv7l-unknown-linux-gnueabihf/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.2.0/include
 /usr/local/include
 /usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.2.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fstack-check=specific'
'-march=armv7-a' '-mfloat-abi=hard' '-mfpu=vfpv3-d16' '-O2' '-pipe'
'-fstack-protector' '--param' 'ssp-buffer-size=4' '-Wall' '-O3' '-ffast-math'
'-g' '-std=gnu99' '-Wno-unused-result' '-Wno-unused-variable' '-c' '-o'
'test.o' '-mtls-dialect=gnu'
 /usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.2.0/cc1 -fpreprocessed test.i
-quiet -dumpbase test.c -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16
-mtls-dialect=gnu -auxbase-strip test.o -g -O2 -O3 -Wall -Wno-unused-result
-Wno-unused-variable -std=gnu99 -version -fstack-check=specific
-fstack-protector -ffast-math --param ssp-buffer-size=4 -o test.s
GNU C99 (GCC) version 5.2.0 (armv7l-unknown-linux-gnueabihf)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=110029
GNU C99 (GCC) version 5.2.0 (armv7l-unknown-linux-gnueabihf)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=110029
Compiler executable checksum: a180855a5eef4028f69bbf8deaf89c29
menu/menu_entry.c: In function 'menu_entry_pathdir_get_value':
menu/menu_entry.c:243:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.

If -fstack-check is removed the source compiles. 4.9.3 works with and without
-fstack-check with the same source.

gcc:
gcc --version
gcc (GCC) 5.2.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

gcc configured:
--prefix=/usr \
      --libdir=/usr/lib --libexecdir=/usr/lib \
      --mandir=/usr/share/man --infodir=/usr/share/info \
      --with-bugurl=https://github.com/archlinuxarm/PKGBUILDs/issues \
      --enable-languages=c,c++,fortran,go,lto,objc,obj-c++ \
      --enable-shared --enable-threads=posix \
      --with-system-zlib --with-isl --enable-__cxa_atexit \
      --disable-libunwind-exceptions --enable-clocale=gnu \
      --disable-libstdcxx-pch --disable-libssp \
      --enable-gnu-unique-object --enable-linker-build-id \
      --enable-lto --enable-plugin --enable-install-libiberty \
      --with-linker-hash-style=gnu --enable-gnu-indirect-function \
      --disable-multilib --disable-werror \
      --enable-checking=release \
      --with-default-libstdcxx-abi=gcc4-compatible \
      --host=armv7l-unknown-linux-gnueabihf
--build=armv7l-unknown-linux-gnueabihf --with-arch=armv7-a --with-float=hard
--with-fpu=vfpv3-d16

This is the distribution compiler on arch linux arm on a RPi2.

Attached is the preproccessed source

[Bug middle-end/67908] gcc segfaults with -fstack-check (internal compiler error) / armv7 host and target

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67908

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-10-12
     Ever confirmed|0                           |1

--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
I cannot reproduce with a cross.  Please run the cc1 command from within GDB:

/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.2.0/cc1 -fpreprocessed test.i
-quiet -dumpbase test.c -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16
-mtls-dialect=gnu -auxbase-strip test.o -g -O2 -O3 -Wall -Wno-unused-result
-Wno-unused-variable -std=gnu99 -version -fstack-check=specific
-fstack-protector -ffast-math --param ssp-buffer-size=4 -o test.s

and post a backtrace.  And note that the implementation of -fstack-check on ARM
is suboptimal and buggy in the 4.x and 5.x compilers; there is a new one on the
mainline (future 6.x compilers).

[Bug middle-end/67908] gcc segfaults with -fstack-check (internal compiler error) / armv7 host and target

[gcc-bugs at zahlenfresser dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67908

--- Comment #2 from Stefan Keller <gcc-bugs at zahlenfresser dot de> ---
The distribution's compiler is built without debug symbols. I need to rebuild,
which may take a while.
Here's the output of gdb in case it helps anyways:

Reading symbols from
/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.2.0/cc1...(no debugging symbols
found)...done.

Program received signal SIGSEGV, Segmentation fault.
0x006320b8 in ?? ()
(gdb) bt
#0  0x006320b8 in ?? ()
#1  0x00697a0c in
substitute_and_fold_dom_walker::before_dom_children(basic_block_def*) ()
#2  0x009c54ec in dom_walker::walk(basic_block_def*) ()
#3  0x00697438 in substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool) ()
#4  0x0062971c in ?? ()
#5  0x00629f48 in ?? ()
#6  0x004cb2b4 in execute_one_pass(opt_pass*) ()
#7  0x004cb6ec in ?? ()
#8  0x004cb704 in ?? ()
#9  0x004cb744 in execute_pass_list(function*, opt_pass*) ()
#10 0x00271744 in cgraph_node::expand() ()
#11 0x00272b7c in ?? ()
#12 0x00274164 in symbol_table::finalize_compilation_unit() ()
#13 0x0018391c in c_write_global_declarations() ()
#14 0x00573900 in ?? ()
#15 0x0016d380 in toplev::main(int, char**) ()
#16 0x0016dfac in main ()

[Bug tree-optimization/67908] gcc segfaults with -fstack-check (internal compiler error) / armv7 host and target

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67908

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
          Component|middle-end                  |tree-optimization

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> The distribution's compiler is built without debug symbols. I need to
> rebuild, which may take a while.

I'll try harder with a cross then.

> Here's the output of gdb in case it helps anyways:

At least it means that the problem won't occur on the mainline.

[Bug tree-optimization/67908] gcc segfaults with -fstack-check (internal compiler error) / armv7 host and target

[gcc-bugs at zahlenfresser dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67908

--- Comment #4 from Stefan Keller <gcc-bugs at zahlenfresser dot de> ---
So I rebuilt gcc:

GNU C99 (GCC) version 5.2.0 (armv7l-unknown-linux-gnueabihf)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=110029
GNU C99 (GCC) version 5.2.0 (armv7l-unknown-linux-gnueabihf)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=110029
Compiler executable checksum: 63e10edc02ccf1dede09ecb3cdb007dd

Program received signal SIGSEGV, Segmentation fault.
fold_builtin_alloca_with_align (stmt=0x766f0d20) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-ccp.c:2067
2067            && TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL))
(gdb) bt
#0  fold_builtin_alloca_with_align (stmt=0x766f0d20) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-ccp.c:2067
#1  ccp_fold_stmt (gsi=0x7efff4cc) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-ccp.c:2172
#2  0x00697a2c in substitute_and_fold_dom_walker::before_dom_children
(this=0x7efff538, bb=0x0) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-propagate.c:1177
#3  0x009c550c in dom_walker::walk (this=0x7efff538, bb=0x766dd940) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/domwalk.c:188
#4  0x00697458 in substitute_and_fold (get_value_fn=get_value_fn@entry=0x62b1c0
<get_constant_value(tree)>, fold_fn=fold_fn@entry=0x631bf4
<ccp_fold_stmt(gimple_stmt_iterator*)>, do_dce=do_dce@entry=true)
    at /usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-propagate.c:1272
#5  0x0062973c in ccp_finalize () at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-ccp.c:941
#6  0x00629f68 in do_ssa_ccp () at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-ccp.c:2382
#7  (anonymous namespace)::pass_ccp::execute (this=<optimized out>) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-ccp.c:2414
#8  0x004cb2d4 in execute_one_pass (pass=pass@entry=0x1053508) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/passes.c:2330
#9  0x004cb70c in execute_pass_list_1 (pass=0x1053508) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/passes.c:2382
#10 0x004cb724 in execute_pass_list_1 (pass=0x1053408, pass@entry=0x1053388) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/passes.c:2383
#11 0x004cb764 in execute_pass_list (fn=0x7669cb60, pass=0x1053388) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/passes.c:2393
#12 0x00271764 in cgraph_node::expand (this=this@entry=0x7669f000) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/cgraphunit.c:1895
#13 0x00272b9c in expand_all_functions () at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/cgraphunit.c:2031
#14 symbol_table::compile (this=this@entry=0x76ad1000) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/cgraphunit.c:2384
#15 0x00274184 in symbol_table::compile (this=0x76ad1000) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/timevar.h:110
#16 symbol_table::finalize_compilation_unit (this=0x76ad1000) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/cgraphunit.c:2461
#17 0x0018393c in c_write_global_declarations () at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/c/c-decl.c:10798
#18 0x00573920 in compile_file () at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/toplev.c:613
#19 0x0016d3a0 in do_compile () at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/toplev.c:2067
#20 toplev::main (this=this@entry=0x7efff8d4, argc=0, argc@entry=27,
argv=0x106e6d8, argv@entry=0x7efffa44) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/toplev.c:2165
#21 0x0016dfcc in main (argc=27, argv=0x7efffa44) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/main.c:39

(gdb) p stmt
$1 = (gimple) 0x766f0d20
(gdb) p *stmt
$2 = {code = GIMPLE_CALL, no_warning = 0, visited = 1, nontemporal_move = 0,
plf = 0, modified = 0, has_volatile_ops = 0, pad = 0, subcode = 32, uid = 1,
location = 1840891, num_ops = 5, bb = 0x766dd940, next = 0x7682f2f8, 
  prev = 0x767fd900}
(gdb) up
#1  ccp_fold_stmt (gsi=0x7efff4cc) at
/usr/src/misc/pkg/gcc/src/gcc-5.2.0/gcc/tree-ssa-ccp.c:2172
2172                tree new_rhs = fold_builtin_alloca_with_align (stmt);
(gdb) p gsi
$3 = (gimple_stmt_iterator *) 0x7efff4cc
(gdb) p *gsi
$4 = {ptr = 0x766f0d20, seq = 0x766dd960, bb = 0x766dd940}

Hope this helps.

[Bug tree-optimization/67908] gcc segfaults with -fstack-check (internal compiler error) / armv7 host and target

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67908

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

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

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Thanks, it's already fixed on the branch.

*** This bug has been marked as a duplicate of bug 67055 ***