https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113603
Bug ID: 113603
Summary: [14 Regression] ICE Segfault during GIMPLE pass:
strlen at -O3
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick at rivosinc dot com
Target Milestone: ---
Command:
> /scratch/tc-testing/tc-jan-8-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
> -O3 red.c -S -freport-bug
during GIMPLE pass: strlen
red.c: In function 'h':
red.c:7:6: internal compiler error: Segmentation fault
7 | int *h() {
| ^
0x12c0303 crash_signal
../../../gcc/gcc/toplev.cc:316
0x7fe82a04251f ???
./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x14f03cc contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
../../../gcc/gcc/tree.h:3757
0x14f03cc maybe_invalidate
../../../gcc/gcc/tree-ssa-strlen.cc:1361
0x14f0861 do_invalidate
../../../gcc/gcc/tree-ssa-strlen.cc:5730
0x150015e strlen_pass::before_dom_children(basic_block_def*)
../../../gcc/gcc/tree-ssa-strlen.cc:5780
0x23cb957 dom_walker::walk(basic_block_def*)
../../../gcc/gcc/domwalk.cc:311
0x15006e6 printf_strlen_execute
../../../gcc/gcc/tree-ssa-strlen.cc:5899
Please submit a full bug report, with preprocessed source.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
The bug is not reproducible, so it is likely a hardware or OS problem.
Testcase:
int a, e;
char b;
int *c;
signed char *d;
short f;
char g[3];
int *h() {
int i = 0;
for (; i < 3; i++)
g[i] = 2;
int j[100][100] = {{}, {4}};
signed char *k = &g[1];
do {
for (;;) {
if (c)
break;
return &a;
}
f = 0;
for (;; f++) {
b = 0;
for (; b < 2; b++)
*c = j[b][f];
if (e)
d = k;
*k = *d;
if (*c)
break;
if (f)
break;
}
} while (f);
return 0;
}
Godbolt:
https://godbolt.org/z/ax1Tzc3To
Occurs on x86, RISC-V, ARM
Found using a fuzzer.
