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Commit9859791

Browse files
gh-128639: Don't assume one thread in subinterpreter finalization (gh-128640)
Incidentally, this also fixed the warning not showing up if a subinterpreter wasn'tcleaned up via _interpreters.destroy. I had to update some of the tests as a result.
1 parentc4ad92e commit9859791

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6 files changed

+99
-38
lines changed

6 files changed

+99
-38
lines changed

‎Lib/test/test_interpreters/test_api.py

Lines changed: 58 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -647,6 +647,59 @@ def test_created_with_capi(self):
647647
self.interp_exists(interpid))
648648

649649

650+
deftest_remaining_threads(self):
651+
r_interp,w_interp=self.pipe()
652+
653+
FINISHED=b'F'
654+
655+
# It's unlikely, but technically speaking, it's possible
656+
# that the thread could've finished before interp.close() is
657+
# reached, so this test might not properly exercise the case.
658+
# However, it's quite unlikely and I'm too lazy to deal with it.
659+
interp=interpreters.create()
660+
interp.exec(f"""if True:
661+
import os
662+
import threading
663+
import time
664+
665+
def task():
666+
time.sleep(1)
667+
os.write({w_interp},{FINISHED!r})
668+
669+
threads = [threading.Thread(target=task) for _ in range(3)]
670+
for t in threads:
671+
t.start()
672+
""")
673+
interp.close()
674+
675+
self.assertEqual(os.read(r_interp,1),FINISHED)
676+
677+
deftest_remaining_daemon_threads(self):
678+
interp=_interpreters.create(
679+
types.SimpleNamespace(
680+
use_main_obmalloc=False,
681+
allow_fork=False,
682+
allow_exec=False,
683+
allow_threads=True,
684+
allow_daemon_threads=True,
685+
check_multi_interp_extensions=True,
686+
gil='own',
687+
)
688+
)
689+
_interpreters.exec(interp,f"""if True:
690+
import threading
691+
import time
692+
693+
def task():
694+
time.sleep(100)
695+
696+
threads = [threading.Thread(target=task, daemon=True) for _ in range(3)]
697+
for t in threads:
698+
t.start()
699+
""")
700+
_interpreters.destroy(interp)
701+
702+
650703
classTestInterpreterPrepareMain(TestBase):
651704

652705
deftest_empty(self):
@@ -755,7 +808,10 @@ def script():
755808
spam.eggs()
756809
757810
interp = interpreters.create()
758-
interp.exec(script)
811+
try:
812+
interp.exec(script)
813+
finally:
814+
interp.close()
759815
""")
760816

761817
stdout,stderr=self.assert_python_failure(scriptfile)
@@ -764,7 +820,7 @@ def script():
764820
# File "{interpreters.__file__}", line 179, in exec
765821
self.assertEqual(stderr,dedent(f"""\
766822
Traceback (most recent call last):
767-
File "{scriptfile}", line9, in <module>
823+
File "{scriptfile}", line10, in <module>
768824
interp.exec(script)
769825
~~~~~~~~~~~^^^^^^^^
770826
{interpmod_line.strip()}

‎Lib/test/test_interpreters/test_lifecycle.py

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -132,6 +132,7 @@ def test_sys_path_0(self):
132132
'sub': sys.path[0],
133133
}}, indent=4), flush=True)
134134
""")
135+
interp.close()
135136
'''
136137
# <tmp>/
137138
# pkg/
@@ -172,7 +173,10 @@ def test_gh_109793(self):
172173
argv= [sys.executable,'-c','''if True:
173174
from test.support import interpreters
174175
interp = interpreters.create()
175-
raise Exception
176+
try:
177+
raise Exception
178+
finally:
179+
interp.close()
176180
''']
177181
proc=subprocess.run(argv,capture_output=True,text=True)
178182
self.assertIn('Traceback',proc.stderr)

‎Lib/test/test_threading.py

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1689,10 +1689,7 @@ def f():
16891689
16901690
_testcapi.run_in_subinterp(%r)
16911691
"""% (subinterp_code,)
1692-
withtest.support.SuppressCrashReport():
1693-
rc,out,err=assert_python_failure("-c",script)
1694-
self.assertIn("Fatal Python error: Py_EndInterpreter: "
1695-
"not the last thread",err.decode())
1692+
assert_python_ok("-c",script)
16961693

16971694
def_check_allowed(self,before_start='',*,
16981695
allowed=True,
Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
Fix a crash when using threads inside of a subinterpreter.

‎Programs/_testembed.c

Lines changed: 6 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1395,9 +1395,12 @@ static int test_audit_subinterpreter(void)
13951395
PySys_AddAuditHook(_audit_subinterpreter_hook,NULL);
13961396
_testembed_initialize();
13971397

1398-
Py_NewInterpreter();
1399-
Py_NewInterpreter();
1400-
Py_NewInterpreter();
1398+
PyThreadState*tstate=PyThreadState_Get();
1399+
for (inti=0;i<3;++i)
1400+
{
1401+
Py_EndInterpreter(Py_NewInterpreter());
1402+
PyThreadState_Swap(tstate);
1403+
}
14011404

14021405
Py_Finalize();
14031406

‎Python/pylifecycle.c

Lines changed: 28 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -1992,6 +1992,7 @@ resolve_final_tstate(_PyRuntimeState *runtime)
19921992
}
19931993
else {
19941994
/* Fall back to the current tstate. It's better than nothing. */
1995+
// XXX No it's not
19951996
main_tstate=tstate;
19961997
}
19971998
}
@@ -2037,6 +2038,16 @@ _Py_Finalize(_PyRuntimeState *runtime)
20372038

20382039
_PyAtExit_Call(tstate->interp);
20392040

2041+
/* Clean up any lingering subinterpreters.
2042+
2043+
Two preconditions need to be met here:
2044+
2045+
- This has to happen before _PyRuntimeState_SetFinalizing is
2046+
called, or else threads might get prematurely blocked.
2047+
- The world must not be stopped, as finalizers can run.
2048+
*/
2049+
finalize_subinterpreters();
2050+
20402051
assert(_PyThreadState_GET()==tstate);
20412052

20422053
/* Copy the core config, PyInterpreterState_Delete() free
@@ -2124,9 +2135,6 @@ _Py_Finalize(_PyRuntimeState *runtime)
21242135
_PyImport_FiniExternal(tstate->interp);
21252136
finalize_modules(tstate);
21262137

2127-
/* Clean up any lingering subinterpreters. */
2128-
finalize_subinterpreters();
2129-
21302138
/* Print debug stats if any */
21312139
_PyEval_Fini();
21322140

@@ -2410,9 +2418,8 @@ Py_NewInterpreter(void)
24102418
returntstate;
24112419
}
24122420

2413-
/* Delete an interpreter and its last thread. This requires that the
2414-
given thread state is current, that the thread has no remaining
2415-
frames, and that it is its interpreter's only remaining thread.
2421+
/* Delete an interpreter. This requires that the given thread state
2422+
is current, and that the thread has no remaining frames.
24162423
It is a fatal error to violate these constraints.
24172424
24182425
(Py_FinalizeEx() doesn't have these constraints -- it zaps
@@ -2442,14 +2449,15 @@ Py_EndInterpreter(PyThreadState *tstate)
24422449
_Py_FinishPendingCalls(tstate);
24432450

24442451
_PyAtExit_Call(tstate->interp);
2445-
2446-
if (tstate!=interp->threads.head||tstate->next!=NULL) {
2447-
Py_FatalError("not the last thread");
2448-
}
2452+
_PyRuntimeState*runtime=interp->runtime;
2453+
_PyEval_StopTheWorldAll(runtime);
2454+
PyThreadState*list=_PyThreadState_RemoveExcept(tstate);
24492455

24502456
/* Remaining daemon threads will automatically exit
24512457
when they attempt to take the GIL (ex: PyEval_RestoreThread()). */
24522458
_PyInterpreterState_SetFinalizing(interp,tstate);
2459+
_PyEval_StartTheWorldAll(runtime);
2460+
_PyThreadState_DeleteList(list,/*is_after_fork=*/0);
24532461

24542462
// XXX Call something like _PyImport_Disable() here?
24552463

@@ -2480,6 +2488,8 @@ finalize_subinterpreters(void)
24802488
PyInterpreterState*main_interp=_PyInterpreterState_Main();
24812489
assert(final_tstate->interp==main_interp);
24822490
_PyRuntimeState*runtime=main_interp->runtime;
2491+
assert(!runtime->stoptheworld.world_stopped);
2492+
assert(_PyRuntimeState_GetFinalizing(runtime)==NULL);
24832493
structpyinterpreters*interpreters=&runtime->interpreters;
24842494

24852495
/* Get the first interpreter in the list. */
@@ -2508,27 +2518,17 @@ finalize_subinterpreters(void)
25082518

25092519
/* Clean up all remaining subinterpreters. */
25102520
while (interp!=NULL) {
2511-
assert(!_PyInterpreterState_IsRunningMain(interp));
2512-
2513-
/* Find the tstate to use for fini. We assume the interpreter
2514-
will have at most one tstate at this point. */
2515-
PyThreadState*tstate=interp->threads.head;
2516-
if (tstate!=NULL) {
2517-
/* Ideally we would be able to use tstate as-is, and rely
2518-
on it being in a ready state: no exception set, not
2519-
running anything (tstate->current_frame), matching the
2520-
current thread ID (tstate->thread_id). To play it safe,
2521-
we always delete it and use a fresh tstate instead. */
2522-
assert(tstate!=final_tstate);
2523-
_PyThreadState_Attach(tstate);
2524-
PyThreadState_Clear(tstate);
2525-
_PyThreadState_Detach(tstate);
2526-
PyThreadState_Delete(tstate);
2521+
/* Make a tstate for finalization. */
2522+
PyThreadState*tstate=_PyThreadState_NewBound(interp,_PyThreadState_WHENCE_FINI);
2523+
if (tstate==NULL) {
2524+
// XXX Some graceful way to always get a thread state?
2525+
Py_FatalError("thread state allocation failed");
25272526
}
2528-
tstate=_PyThreadState_NewBound(interp,_PyThreadState_WHENCE_FINI);
25292527

2530-
/*Destroy the subinterpreter. */
2528+
/*Enter the subinterpreter. */
25312529
_PyThreadState_Attach(tstate);
2530+
2531+
/* Destroy the subinterpreter. */
25322532
Py_EndInterpreter(tstate);
25332533
assert(_PyThreadState_GET()==NULL);
25342534

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