https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117917
Bug ID: 117917
Summary: Hangs on avx512
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: xieym3 at zohomail dot com
Target Milestone: ---
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=/data/xieym/exp/gcc/test_data/gcc-latest-install/bin/gcc
COLLECT_LTO_WRAPPER=/data/xieym/exp/gcc/test_data/gcc-latest-install/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /data/xieym/exp/gcc/test_data/gcc-latest-src/configure
--enable-coverage --enable-checking --disable-multilib --disable-shared
--disable-bootstrap --enable-languages=c,c++
--prefix=/data/xieym/exp/gcc/test_data/gcc-latest-install
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20241203 (experimental) (GCC)
(fuzz4all) ➜ hangs git:(main) ✗ cat crash_20241204_073058_00b5.c
#include <stdlib.h>
int main(int argc, char **argv) {
size_t i;
int *p =
(
void
*
)
calloc
(
4
*
1000
*
1000
*
[
(
(
(
int
)
)
;
for
(
i
=
0
;
i
<
4
*
1000
*
1000
*
1000
;
i
++
)
{
*p = increment(*p);
p += 7;
}
return 0;
}
#include <immintrin.h>
int main(int argc, char **argv) {
volatile int i = 7;
volatile int j = 11;
int k;
for (k = 0; k < 1000; k++) {
_mm_empty();
i -= j;
}
}
$ gcc-trunk -x c -std=c2x -c crash_20241204_073058_00b5.c -o /dev/nul
# It has been running for a minute and still hasn’t finished.
