https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105065
Bug ID: 105065
Summary: Internal compiler error (segfault) when calling a
function with a sized array parameter returning a type
bigger than 16 bytes
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: niget.tom at gmail dot com
Target Milestone: ---
The following code:
--------------------------------------------------------
# 0 "main.c"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 0 "<command-line>" 2
# 1 "main.c"
typedef struct
{
char filler[17];
} big_struct;
big_struct dummy(int size, char array[size]);
int main()
{
dummy(0, 0);
}
--------------------------------------------------------
Gives the following error when built normally (`gcc main.c`):
--------------------------------------------------------
during RTL pass: expand
/tmp/gccbug/main.c: In function ‘main’:
/tmp/gccbug/main.c:10:5: internal compiler error: Segmentation fault
10 | dummy(0, 0); // arguments don't matter
| ^~~~~~~~~~~
0xa563ed crash_signal
../../src/gcc/toplev.c:327
0x7f3d8de5651f ???
./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x1134db4 get_size_range(range_query*, tree_node*, gimple*, tree_node**, int)
../../src/gcc/calls.c:1274
0x1134db4 get_size_range(range_query*, tree_node*, gimple*, tree_node**, int)
../../src/gcc/calls.c:1260
0x1129e96 get_size_range(tree_node*, tree_node**, int)
../../src/gcc/calls.c:1401
0x1129e96 maybe_warn_rdwr_sizes
../../src/gcc/calls.c:2034
0x1129e96 initialize_argument_information
../../src/gcc/calls.c:2626
0x1129e96 expand_call(tree_node*, rtx_def*, int)
../../src/gcc/calls.c:4010
0x105339e expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../src/gcc/expr.c:11287
0x10ad851 expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
../../src/gcc/expr.c:8519
0x10ad851 expand_expr
../../src/gcc/expr.h:282
0x10ad851 expand_call_stmt
../../src/gcc/cfgexpand.c:2840
0x10ad851 expand_gimple_stmt_1
../../src/gcc/cfgexpand.c:3871
0x10ad851 expand_gimple_stmt
../../src/gcc/cfgexpand.c:4035
0x1077e48 expand_gimple_basic_block
../../src/gcc/cfgexpand.c:6077
0x1077e48 execute
../../src/gcc/cfgexpand.c:6761
--------------------------------------------------------
`big_struct` can be pretty much anything as long as it's strictly bigger than
16 bytes. The types of `size` and `array` do not matter, as long as `array` is
sized with `size`.
The parameters given to `dummy` do not matter (I used 0 and 0 here, but a real
size and array trigger the crash too).
`dummy` must not have an implementation in the same compilation unit as its
call site (it can be implemented in a separate file).
Technical details:
--------------------------------------------------------
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.2.0-7ubuntu2'
--with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-11
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--enable-libphobos-checking=release --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-11-ZPT0kp/gcc-11-11.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-ZPT0kp/gcc-11-11.2.0/debian/tmp-gcn/usr
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.2.0 (Ubuntu 11.2.0-7ubuntu2)
--------------------------------------------------------
