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Running test test_read1_error_does_not_cause_reentrant_failure triggers ASan allocation error in test_bufferedio #159497
Description
Crash report
export CFLAGS="-g -O1 -fno-omit-frame-pointer"
./configure --with-address-sanitizer --without-pymalloc
make -j4
make -j4 test TESTOPTS="--timeout 120"=================================================================
==652577==ERROR: AddressSanitizer: requested allocation size 0x4000000000000021 (0x4000000000001028 after adjustments for alignment, red zones etc.) exceeds maximum supported size of 0x10000000000 (thread T0)
#0 0x7f1c631280cf in malloc (/usr/lib/gcc/x86_64-pc-linux-gnu/16/libasan.so.8+0x1280cf) (BuildId: 5dd8e204bdee85231489adbf7600ae439ded251b)
#1 0x558987b0e01b in _PyMem_RawMalloc Objects/obmalloc.c:66
#2 0x558987b354c6 in PyObject_Malloc Objects/obmalloc.c:1716
#3 0x558987a17f51 in bytes_alloc Objects/bytesobject.c:133
#4 0x558987a27169 in byteswriter_resize Objects/bytesobject.c:3875
#5 0x558987a27169 in byteswriter_create Objects/bytesobject.c:3929
#6 0x558987a271a4 in PyBytesWriter_Create Objects/bytesobject.c:3952
#7 0x558987ef5a20 in _io__Buffered_read1_impl Modules/_io/bufferedio.c:1074
#8 0x558987ef5a20 in _io__Buffered_read1 Modules/_io/clinic/bufferedio.c.h:652
#9 0x558987a52e09 in method_vectorcall_FASTCALL Objects/descrobject.c:404
#10 0x558987a323f1 in _PyObject_VectorcallTstate Include/internal/pycore_call.h:143
#11 0x558987a323f1 in PyObject_Vectorcall Objects/call.c:327
#12 0x558987cab969 in _Py_VectorCallInstrumentation_StackRefSteal Python/ceval.c:773
#13 0x558987cbefee in _PyEval_EvalFrameDefault Python/generated_cases.c.h:1906
#14 0x558987ce9ad2 in _PyEval_EvalFrame Include/internal/pycore_ceval.h:122
#15 0x558987ce9ad2 in _PyEval_Vector Python/ceval.c:2226
#16 0x558987a31ca8 in _PyFunction_Vectorcall Objects/call.c:413
#17 0x558987a34101 in _PyObject_VectorcallTstate Include/internal/pycore_call.h:143
#18 0x558987a34101 in _PyObject_VectorcallPrepend Objects/call.c:910
#19 0x558987a38979 in method_vectorcall Objects/classobject.c:55
#20 0x558987a36682 in _PyVectorcall_Call Objects/call.c:273
#21 0x558987a36a6a in _PyObject_Call Objects/call.c:348
#22 0x558987a36aca in PyObject_Call Objects/call.c:373
#23 0x558987cc2fd6 in _PyEval_EvalFrameDefault Python/generated_cases.c.h:3164
#24 0x558987ce9ad2 in _PyEval_EvalFrame Include/internal/pycore_ceval.h:122
#25 0x558987ce9ad2 in _PyEval_Vector Python/ceval.c:2226
#26 0x558987a31ca8 in _PyFunction_Vectorcall Objects/call.c:413
#27 0x558987a36158 in _PyObject_VectorcallDictTstate Objects/call.c:135
#28 0x558987a3654e in _PyObject_Call_Prepend Objects/call.c:504
#29 0x558987b6b9d6 in call_method Objects/typeobject.c:3075
#30 0x558987b6bc58 in slot_tp_call Objects/typeobject.c:10892
#31 0x558987a31eda in _PyObject_MakeTpCall Objects/call.c:242
#32 0x558987a3243b in _PyObject_VectorcallTstate Include/internal/pycore_call.h:141
#33 0x558987a3243b in PyObject_Vectorcall Objects/call.c:327
#34 0x558987cab5b8 in _Py_VectorCall_StackRefSteal Python/ceval.c:731
#35 0x558987cc7619 in _PyEval_EvalFrameDefault Python/generated_cases.c.h:4566
#36 0x558987ce9ad2 in _PyEval_EvalFrame Include/internal/pycore_ceval.h:122
#37 0x558987ce9ad2 in _PyEval_Vector Python/ceval.c:2226
==652577==HINT: if you don't care about these errors you may set allocator_may_return_null=1
SUMMARY: AddressSanitizer: allocation-size-too-big Objects/obmalloc.c:66 in _PyMem_RawMalloc
==652577==ABORTING
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.16.0a1+dev (heads/main:fdec4df45ab, Oct 15 2026, 19:14:03) [GCC 16.2.1 20260926]
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