https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123655
--- Comment #6 from Sam James <sjames at gcc dot gnu.org> ---
The failure is strange and on one machine I see it for x86_64 too:
```
Program received signal SIGSEGV, Segmentation fault.
Downloading 39.94 K source file
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libgcc/unwind-dw2.c
_Unwind_GetPtr (context=0x7ffff7fb6de0, index=16) at
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libgcc/unwind-dw2.c:260
260 return (void *)(_Unwind_Ptr) _Unwind_GetGR (context, index);
(gdb) bt
#0 _Unwind_GetPtr (context=0x7ffff7fb6de0, index=16) at
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libgcc/unwind-dw2.c:260
#1 uw_update_context (context=0x7ffff7fb6de0, fs=0x7ffff7fb6ed0) at
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libgcc/unwind-dw2.c:1296
#2 _Unwind_Backtrace
(trace=0x7ffff7fad920, trace_argument=0x7ffff7fb7010) at
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libgcc/unwind.inc:326
#3 0x00007ffff7fad9b3 in ?? ()
#4 0x0000006400000001 in ?? ()
#5 0x1d3e1cce5e9d0b00 in ?? ()
#6 0x00007ffff7fb7030 in ?? ()
#7 0x00007ffff7c44680 in __correctly_grouped_prefixwc (begin=0x0,
end=0x7fffffffd4e8 L"\xffffddd8翿\xffffddd8翿", thousands=9 L'\t',
grouping=<optimized out>)
at
/var/tmp/portage/sys-libs/glibc-2.42.9999/work/glibc-2.42.9999/stdlib/grouping.c:159
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
```
```
#2 _Unwind_Backtrace (trace=0x7ffff7fad920, trace_argument=0x7ffff7fb7010) at
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libgcc/unwind.inc:326
326 uw_update_context (&context, &fs);
(gdb) p context
$1 = {
reg = {0x0, 0x0, 0x0,
0xffffffffffffffd9, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffe1,
0xffffffffffffffe9, 0xfffffffffffffff1, 0xfffffffffffffff9, 0x9, 0x0},
cfa = 0x11,
ra = 0x7ffff7c44680 <__start_context>,
lsda = 0x0,
bases = {
tbase = 0x0,
dbase = 0x0,
func = 0x7ffff7c434c0 <__correctly_grouped_prefixwc>
},
flags =
4611686018427387904,
version = 0,
args_size = 0,
by_value = '\000' <repeats 17 times>
}
```
so broken unwind info for __correctly_grouped_prefixwc?
