[Bug testsuite/34340] ptid_t selftest segfaults

https://sourceware.org/bugzilla/show_bug.cgi?id=34340

--- Comment #1 from Sam James <sam at gentoo dot org> ---
```
Core was generated by `./gdb
--data-directory=/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/data-directory
-batch -ex maintenance\ selftest'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  std::__uniq_ptr_impl<ui_file, std::default_delete<ui_file> >::_M_ptr
(this=0xafef2d0c9c2c9a20, this=<optimized out>) at
/usr/lib/gcc/x86_64-pc-linux-gnu/17/include/g++-v17/bits/unique_ptr.h:192
192           pointer    _M_ptr() const noexcept { return std::get<0>(_M_t); }
[Current thread is 1 (Thread 0x7fbdbdb78280 (LWP 1806793))]
[...]
(gdb) bt
#0  std::__uniq_ptr_impl<ui_file, std::default_delete<ui_file> >::_M_ptr
(this=0xafef2d0c9c2c9a20, this=<optimized out>) at
/usr/lib/gcc/x86_64-pc-linux-gnu/17/include/g++-v17/bits/unique_ptr.h:192
#1  std::unique_ptr<ui_file, std::default_delete<ui_file> >::get
(this=0xafef2d0c9c2c9a20, this=<optimized out>) at
/usr/lib/gcc/x86_64-pc-linux-gnu/17/include/g++-v17/bits/unique_ptr.h:491
#2  interp::get_stderr (this=0xafef2d0c9c2c9a00) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/interps.h:213
#3  current_gdb_stderr () at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/top.c:126
#4  sig_write (msg=0x55d51385d250 "0x55d4f10c7582 ") at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/bt-utils.c:48
#5  0x000055d4f10c7413 in libbacktrace_print (data=<optimized out>,
pc=<optimized out>, filename=0x7fbd852b7600
"/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/bt-utils.c", lineno=122,
    function=0x7fbd250ce6dc "gdb_internal_backtrace_1") at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/bt-utils.c:94
#6  0x000055d4f1801c45 in report_inlined_functions (pc=pc@entry=94373065553282,
callback=callback@entry=0x55d4f10c73c0 <libbacktrace_print(void*, uintptr_t,
char const*, int, char const*)>,
    data=data@entry=0x0, filename=filename@entry=0x55d51385d4b0,
lineno=0x55d51385d470, function=0x7fbd84d0f6b0) at ../libbacktrace/dwarf.c:3624
#7  0x000055d4f1801c20 in report_inlined_functions (pc=pc@entry=94373065553282,
callback=callback@entry=0x55d4f10c73c0 <libbacktrace_print(void*, uintptr_t,
char const*, int, char const*)>,
    data=data@entry=0x0, filename=filename@entry=0x55d51385d4b0,
lineno=0x55d51385d470, function=0x7fbd84d0f688) at ../libbacktrace/dwarf.c:3618
#8  0x000055d4f1807de4 in dwarf_lookup_pc (state=<optimized out>,
ddata=<optimized out>, pc=<optimized out>, callback=<optimized out>,
error_callback=<optimized out>, data=<optimized out>,
    found=<optimized out>) at ../libbacktrace/dwarf.c:3891
#9  0x000055d4f18097a8 in dwarf_fileline (state=0x7fbdbec17000,
pc=94373065553282, callback=0x55d4f10c73c0 <libbacktrace_print(void*,
uintptr_t, char const*, int, char const*)>,
    error_callback=0x55d4f10c72f0 <libbacktrace_error(void*, char const*,
int)>, data=<optimized out>) at ../libbacktrace/dwarf.c:3918
#10 0x000055d4f17f287a in backtrace_pcinfo (state=0x7fbdbec17000,
pc=94373065553282, callback=<optimized out>, error_callback=0x55d4f10c72f0
<libbacktrace_error(void*, char const*, int)>, data=<optimized out>)
    at ../libbacktrace/fileline.c:362
#11 backtrace_pcinfo (state=0x7fbdbec17000, pc=<optimized out>,
callback=<optimized out>, error_callback=<optimized out>, data=<optimized out>)
at ../libbacktrace/fileline.c:352
#12 unwind (context=<optimized out>, vdata=0x55d51385d9c0) at
../libbacktrace/backtrace.c:91
#13 0x00007fbdbe7e0e3d in _Unwind_Backtrace (trace=0x55d4f17f2740
<unwind(_Unwind_Context*, void*)>, trace_argument=0x55d51385d9c0) at
/usr/src/debug/sys-devel/gcc-17.0.9999/gcc-17.0.9999/libgcc/unwind.inc:309
#14 0x000055d4f17f6780 in backtrace_full (state=0x7fbdbec17000, data=0x0,
error_callback=<optimized out>, callback=<optimized out>, skip=0) at
../libbacktrace/backtrace.c:127
#15 0x000055d4f10c7583 in gdb_internal_backtrace_1 () at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/bt-utils.c:122
#16 gdb_internal_backtrace () at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/bt-utils.c:173
#17 gdb_internal_backtrace () at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/bt-utils.c:165
#18 0x000055d4f127ed7b in handle_fatal_signal (sig=sig@entry=11) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/event-top.c:1008
#19 0x000055d4f127efe5 in handle_sigsegv (sig=11) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/event-top.c:1085
#20 <signal handler called>
#21 0x000055d4f1690929 in selftests::ptid::parse_one
(str=str@entry=0x55d4f1886861 "-1", for_remote=for_remote@entry=true) at
unittests/ptid-selftests.c:163
#22 0x000055d4f16955ae in selftests::ptid::test () at
unittests/ptid-selftests.c:188
#23 0x000055d4f13b316d in std::function<void()>::operator()
(this=0x55d513898a00, this=<optimized out>) at
/usr/lib/gcc/x86_64-pc-linux-gnu/17/include/g++-v17/bits/std_function.h:581
#24 selftests::run_tests (filters=..., verbose=<optimized out>) at
../gdbsupport/selftest.cc:100
#25 maintenance_selftest (args=<optimized out>, from_tty=<optimized out>) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/maint.c:1261
#26 0x000055d4f160521c in cmd_func (cmd=0x55d5138dc320, args=<optimized out>,
from_tty=0) at cli/cli-decode.c:2810
#27 execute_command (p=<optimized out>, from_tty=<optimized out>) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/top.c:632
#28 0x000055d4f13a8e0d in catch_command_errors (command=<optimized out>,
arg=<optimized out>, from_tty=<optimized out>, do_bp_actions=true) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/main.c:507
#29 execute_cmdargs (cmdarg_vec=cmdarg_vec@entry=0x7ffdd93788b0,
file_type=file_type@entry=CMDARG_FILE, cmd_type=cmd_type@entry=CMDARG_COMMAND,
ret=ret@entry=0x7ffdd93788a0)
    at /var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/main.c:606
#30 0x000055d4f13b06c5 in captured_main_1(captured_main_args*) [clone
.constprop.0] (context=context@entry=0x7ffdd9378c90) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/main.c:1340
#31 0x000055d4f0fdb0e8 in captured_main (context=0x7ffdd9378c90) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/main.c:1363
#32 gdb_main (args=0x7ffdd9378c90) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/main.c:1392
#33 main (argc=5, argv=0x7ffdd9378de8) at
/var/tmp/portage/dev-debug/gdb-9999/work/gdb-9999/gdb/gdb.c:38
```

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