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Description
Crash report
What happened?
It's possible to non-deterministically abort a special debug JIT build by running the code below, running from a Python executable from a venv where you installedtwo packages in editable mode.
For this special build, apply this diff:
index 454c8dde031..9e21c41421a 100644--- a/Include/internal/pycore_backoff.h+++ b/Include/internal/pycore_backoff.h@@ -99,8 +99,8 @@ backoff_counter_triggers(_Py_BackoffCounter counter) // Must be larger than ADAPTIVE_COOLDOWN_VALUE, otherwise when JIT code is // invalidated we may construct a new trace before the bytecode has properly // re-specialized:-#define JUMP_BACKWARD_INITIAL_VALUE 4095-#define JUMP_BACKWARD_INITIAL_BACKOFF 12+#define JUMP_BACKWARD_INITIAL_VALUE 63+#define JUMP_BACKWARD_INITIAL_BACKOFF 6 static inline _Py_BackoffCounter initial_jump_backoff_counter(void) {@@ -112,8 +112,8 @@ initial_jump_backoff_counter(void) * Must be larger than ADAPTIVE_COOLDOWN_VALUE, * otherwise when a side exit warms up we may construct * a new trace before the Tier 1 code has properly re-specialized. */-#define SIDE_EXIT_INITIAL_VALUE 4095-#define SIDE_EXIT_INITIAL_BACKOFF 12+#define SIDE_EXIT_INITIAL_VALUE 63+#define SIDE_EXIT_INITIAL_BACKOFF 6 static inline _Py_BackoffCounter initial_temperature_backoff_counter(void)diff --git a/Include/internal/pycore_optimizer.h b/Include/internal/pycore_optimizer.hindex 8b7f12bf03d..8cc51959063 100644--- a/Include/internal/pycore_optimizer.h+++ b/Include/internal/pycore_optimizer.h@@ -163,7 +163,7 @@ static inline uint16_t uop_get_error_target(const _PyUOpInstruction *inst) // progress (and inserting a new ENTER_EXECUTOR instruction). In practice, this // is the "maximum amount of polymorphism" that an isolated trace tree can // handle before rejoining the rest of the program.-#define MAX_CHAIN_DEPTH 4+#define MAX_CHAIN_DEPTH 16 /* Symbols */ /* See explanation in optimizer_symbols.c */
This MRE must be invoked like this:
/path/to/venv/with/editable/installs/bin/python mre.pySorry about another long MRE, this code also seems stubbornly hard to reduce. MRE:
fromrandomimportrandintclassUnstableHash_unstable_hash_object_v4:hash_count=0def__hash__(self):self.hash_count+=1new_hash=5ifself.hash_count<70elserandint(0,1024)print(new_hash)returnnew_hashunstable_hash_object_v4=UnstableHash_unstable_hash_object_v4()tuple_v6= (90.1433,)defuop_harness_f1():classShapeA_la_7776:payload=123classShapeB_la_7776:@propertydefpayload(self):return'property_payload'classShapeC_la_7776:defpayload(self):returnid(self)classShapeD_la_7776:__slots__= ['payload']def__init__(self):self.payload='slot_payload'shapes_la_7776= [ShapeA_la_7776(),ShapeB_la_7776(),ShapeC_la_7776(),ShapeD_la_7776()]foriinrange(500):obj=shapes_la_7776[i%len(shapes_la_7776)]try:payload_val=obj.payloadifcallable(payload_val):payload_val()payload_val()payload_val()payload_val()exceptException:pass {unstable_hash_object_v4,unstable_hash_object_v4} {unstable_hash_object_v4,unstable_hash_object_v4} {unstable_hash_object_v4,unstable_hash_object_v4} {unstable_hash_object_v4,unstable_hash_object_v4}fori_loop_1589in {2,1,2,3,4,5,6,8,10,9,12,10,12,13,14,15,17,17}:x,*y=tuple_v6x,*y=tuple_v6fori_f1inrange(300):try:uop_harness_f1()exceptExceptionase:break
Backtrace:
Python/optimizer.c:269: _PyObject_GC_UNTRACK: Assertion "_PyObject_GC_IS_TRACKED(((PyObject*)(op)))" failed: object not tracked by the garbage collectorEnable tracemalloc to get the memory block allocation tracebackobject address : 0x555555f82230object refcount : 0object type : 0x555555c5e680object type name: uop_executorobject repr : <refcnt 0 at 0x555555f82230>Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailedPython runtime state: initializedCurrent thread 0x00007ffff7ea8780 [python] (most recent call first): File "/home/danzin/crashers/jit/reduced_crash_retcode_child_15732_2.py", line 47 in uop_harness_f1 File "/home/danzin/crashers/jit/reduced_crash_retcode_child_15732_2.py", line 56 in <module>Program received signal SIGABRT, Aborted.#0 __pthread_kill_implementation (threadid=<optimized out>, signo=6, no_tid=0) at ./nptl/pthread_kill.c:44#1 __pthread_kill_internal (threadid=<optimized out>, signo=6) at ./nptl/pthread_kill.c:89#2 __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:100#3 0x00007ffff7c4579e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26#4 0x00007ffff7c288cd in __GI_abort () at ./stdlib/abort.c:73#5 0x00005555558bba92 in fatal_error_exit (status=<optimized out>) at Python/pylifecycle.c:3155#6 0x00005555558bd07d in fatal_error (fd=2, header=header@entry=1, prefix=prefix@entry=0x5555559f7e90 <__func__.11> "_PyObject_AssertFailed", msg=msg@entry=0x555555980fe5 "_PyObject_AssertFailed", status=status@entry=-1) at Python/pylifecycle.c:3371#7 0x00005555558bd0ef in _Py_FatalErrorFunc (func=func@entry=0x5555559f7e90 <__func__.11> "_PyObject_AssertFailed", msg=msg@entry=0x555555980fe5 "_PyObject_AssertFailed") at Python/pylifecycle.c:3387#8 0x00005555556dd237 in _PyObject_AssertFailed (obj=obj@entry=0x555555f82230, expr=expr@entry=0x5555559a9f60 "_PyObject_GC_IS_TRACKED(((PyObject*)(op)))", msg=msg@entry=0x5555559a9f30 "object not tracked by the garbage collector", file=file@entry=0x55555598c050 "Python/optimizer.c", line=line@entry=269, function=function@entry=0x555555a9c010 <__func__.9> "_PyObject_GC_UNTRACK") at Objects/object.c:3165#9 0x00005555558a2303 in _PyObject_GC_UNTRACK (filename=filename@entry=0x55555598c050 "Python/optimizer.c", lineno=lineno@entry=269, op=op@entry=0x555555f82230) at ./Include/internal/pycore_gc.h:269#10 0x00005555558a3198 in uop_dealloc (op=op@entry=0x555555f82230) at Python/optimizer.c:269#11 0x00005555556dc978 in _Py_Dealloc (op=op@entry=0x555555f82230) at Objects/object.c:3206#12 0x00005555557b47ab in Py_DECREF_MORTAL (filename=filename@entry=0x5555559aaec8 "./Include/internal/pycore_stackref.h", lineno=lineno@entry=701, op=0x555555f82230) at ./Include/internal/pycore_object.h:450#13 0x00005555557b485b in PyStackRef_CLOSE (ref=..., ref@entry=...) at ./Include/internal/pycore_stackref.h:701#14 0x00005555557cfe33 in _PyEval_EvalFrameDefault (tstate=0x555555cca298 <_PyRuntime+331064>, frame=0x7fffffffce30, throwflag=0) at Python/generated_cases.c.h:7656#15 0x00005555557dd559 in _PyEval_EvalFrame (tstate=tstate@entry=0x555555cca298 <_PyRuntime+331064>, frame=frame@entry=0x7ffff7fac180, throwflag=throwflag@entry=0) at ./Include/internal/pycore_ceval.h:119#16 0x00005555557dd72a in _PyEval_Vector (tstate=0x555555cca298 <_PyRuntime+331064>, func=0x7ffff74e8650, locals=locals@entry=0x0, args=0x7fffffffd008, argcount=<optimized out>, kwnames=0x0) at Python/ceval.c:1977#17 0x000055555567dc31 in _PyFunction_Vectorcall (func=<optimized out>, stack=<optimized out>, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/call.c:413#18 0x000055555567df88 in _PyObject_VectorcallTstate (tstate=0x555555cca298 <_PyRuntime+331064>, callable=callable@entry=0x7ffff74e8650, args=args@entry=0x7fffffffd008, nargsf=nargsf@entry=9223372036854775809, kwnames=kwnames@entry=0x0) at ./Include/internal/pycore_call.h:169#19 0x000055555567e0b4 in PyObject_CallOneArg (func=func@entry=0x7ffff74e8650, arg=arg@entry=0x7ffff728c8a0) at Objects/call.c:395#20 0x000055555570a05e in call_unbound_noarg (unbound=unbound@entry=1, func=func@entry=0x7ffff74e8650, self=self@entry=0x7ffff728c8a0) at Objects/typeobject.c:3019#21 0x000055555571717f in maybe_call_special_no_args (self=self@entry=0x7ffff728c8a0, attr=<optimized out>, attr_is_none=attr_is_none@entry=0x7fffffffd084) at Objects/typeobject.c:3132#22 0x000055555571746b in slot_tp_hash (self=0x7ffff728c8a0) at Objects/typeobject.c:10489#23 0x00005555556dbf44 in PyObject_Hash (v=0x7ffff728c8a0) at Objects/object.c:1158#24 0x00005555556fb0b2 in _PyObject_HashFast (op=op@entry=0x7ffff728c8a0) at ./Include/internal/pycore_object.h:872#25 0x00005555556ffaaf in _PySet_AddTakeRef (so=0x7ffff72e5c70, key=0x7ffff728c8a0) at Objects/setobject.c:234#26 0x00007ffff706a948 in ?? ()#27 0xfffffffffffffffe in ?? ()#28 0x0000555555cca298 in _PyRuntime ()#29 0x00007fffffffd420 in ?? ()#30 0x00007ffff70a9017 in ?? ()#31 0x0000555555eb4dc0 in ?? ()#32 0x00007ffff70a9000 in ?? ()#33 0x0000555555cca298 in _PyRuntime ()#34 0x00007ffff7fac0a0 in ?? ()#35 0x00007ffff7fac160 in ?? ()#36 0x00005555557ca1c0 in _PyEval_EvalFrameDefault (tstate=<error reading variable: Cannot access memory at address 0xfffffffffffffda0>, frame=0xffffffffffffffff, throwflag=<error reading variable: Cannot access memory at address 0xfffffffffffffd8c>) at Python/generated_cases.c.h:5598Backtrace stopped: previous frame inner to this frame (corrupt stack?)Here are the outputs from running with PYTHON_OPT_DEBUG=4 and PYTHON_LLTRACE=4, since they are too long I've attached them as files:
opt_debug_15732.txt
lltrace_15732.txt
Found usinglafleur.
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.15.0a0 (heads/main-dirty:6bf1c0ab349, Jul 22 2025, 11:26:33) [GCC 14.2.0]