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Python 3.14+:python: Objects/unicodeobject.c:10387: _PyUnicode_JoinArray: Assertionres_data == PyUnicode_1BYTE_DATA(res) + kind * PyUnicode_GET_LENGTH(res)' failed.` in sqlglot #134889

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3.14bugs and security fixes3.15new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dump
@mgorny

Description

@mgorny

Crash report

What happened?

The pure Python code insqlglot package manages to trigger an assertion in CPython:

python: Objects/unicodeobject.c:10387: _PyUnicode_JoinArray: Assertion `res_data == PyUnicode_1BYTE_DATA(res) + kind * PyUnicode_GET_LENGTH(res)' failed.Aborted (core dumped)

Unfortunately, due to limited this is as far as I've been able to reduce it:

fromsqlglotimportparse_oneparse_one("SELECT * FROM taxi ORDER BY 1 OFFSET 0 ROWS FETCH NEXT 3 ROWS ONLY").sql()

I can reproduce with 4.14.0b2 and4109a9c, built with--with-assertions (but for some reason, doesn't happen if I build--with-pydebug), against sqlglot 26.23.0, i.e.:

CFLAGS='-O0 -g' ./configure -C --with-assertionsmake -j$(nproc)./python -m venv .venv.venv/bin/pip install sqlglot.venv/bin/python -c 'from sqlglot import parse_one; parse_one("SELECT * FROM taxi ORDER BY 1 OFFSET 0 ROWS FETCH NEXT 3 ROWS ONLY").sql()'
(gdb) bt#0  0x00007feb24e84dbc in ?? () from /usr/lib64/libc.so.6#1  0x00007feb24e2c8e6 in raise () from /usr/lib64/libc.so.6#2  0x00007feb24e1434b in abort () from /usr/lib64/libc.so.6#3  0x00007feb24e142b5 in ?? () from /usr/lib64/libc.so.6#4  0x000055e03a36ecf3 in _PyUnicode_JoinArray (separator=0x55e03a899bc8 <_PyRuntime+35496>, items=0x7ffeef0e9278, seqlen=4)    at Objects/unicodeobject.c:10387#5  0x000055e03a423f4a in _PyEval_EvalFrameDefault (tstate=0x55e03a8de070 <_PyRuntime+315216>, frame=0x7feb250e9690, throwflag=0)    at Python/generated_cases.c.h:1414#6  0x000055e03a41a1f2 in _PyEval_EvalFrame (tstate=0x55e03a8de070 <_PyRuntime+315216>, frame=0x7feb250e9120, throwflag=0)    at ./Include/internal/pycore_ceval.h:119#7  0x000055e03a45c7d0 in _PyEval_Vector (tstate=0x55e03a8de070 <_PyRuntime+315216>, func=0x7feb237f54e0, locals=0x0,     args=0x7ffeef0e95f0, argcount=2, kwnames=0x0) at Python/ceval.c:1975#8  0x000055e03a21d64d in _PyFunction_Vectorcall (func=0x7feb237f54e0, stack=0x7ffeef0e95f0, nargsf=2, kwnames=0x0)    at Objects/call.c:413#9  0x000055e03a2213da in _PyObject_VectorcallTstate (tstate=0x55e03a8de070 <_PyRuntime+315216>, callable=0x7feb237f54e0,     args=0x7ffeef0e95f0, nargsf=2, kwnames=0x0) at ./Include/internal/pycore_call.h:169#10 0x000055e03a221f4e in method_vectorcall (method=0x7feb237a7c80, args=0x7feb240d5220, nargsf=1, kwnames=0x0)    at Objects/classobject.c:94#11 0x000055e03a21cfc4 in _PyVectorcall_Call (tstate=0x55e03a8de070 <_PyRuntime+315216>, func=0x55e03a221c5a <method_vectorcall>,     callable=0x7feb237a7c80, tuple=0x7feb240d5200, kwargs=0x7feb23810ac0) at Objects/call.c:273#12 0x000055e03a21d36b in _PyObject_Call (tstate=0x55e03a8de070 <_PyRuntime+315216>, callable=0x7feb237a7c80, args=0x7feb240d5200,     kwargs=0x7feb23810ac0) at Objects/call.c:348#13 0x000055e03a21d446 in PyObject_Call (callable=0x7feb237a7c80, args=0x7feb240d5200, kwargs=0x7feb23810ac0) at Objects/call.c:373#14 0x000055e03a42a262 in _PyEval_EvalFrameDefault (tstate=0x55e03a8de070 <_PyRuntime+315216>, frame=0x7feb250e9088, throwflag=0)    at Python/generated_cases.c.h:2654#15 0x000055e03a41a1f2 in _PyEval_EvalFrame (tstate=0x55e03a8de070 <_PyRuntime+315216>, frame=0x7feb250e9020, throwflag=0)    at ./Include/internal/pycore_ceval.h:119#16 0x000055e03a45c7d0 in _PyEval_Vector (tstate=0x55e03a8de070 <_PyRuntime+315216>, func=0x7feb240e73d0, locals=0x7feb240f0300,     args=0x0, argcount=0, kwnames=0x0) at Python/ceval.c:1975#17 0x000055e03a41d431 in PyEval_EvalCode (co=0x7feb24112780, globals=0x7feb240f0300, locals=0x7feb240f0300) at Python/ceval.c:866#18 0x000055e03a51b066 in run_eval_code_obj (tstate=0x55e03a8de070 <_PyRuntime+315216>, co=0x7feb24112780, globals=0x7feb240f0300,     locals=0x7feb240f0300) at Python/pythonrun.c:1365#19 0x000055e03a51b5dc in run_mod (mod=0x55e05c7c3728, filename=0x7feb240f0370, globals=0x7feb240f0300, locals=0x7feb240f0300,     flags=0x7ffeef0ed160, arena=0x7feb24d07cb0, interactive_src=0x7feb241259d0, generate_new_source=0) at Python/pythonrun.c:1436#20 0x000055e03a51ac55 in _PyRun_StringFlagsWithName (    str=0x7feb24125a90 "from sqlglot import parse_one; parse_one(\"SELECT * FROM taxi ORDER BY 1 OFFSET 0 ROWS FETCH NEXT 3 ROWS ONLY\").sql()\n", name=0x7feb240f0370, start=257, globals=0x7feb240f0300, locals=0x7feb240f0300, flags=0x7ffeef0ed160,     generate_new_source=0) at Python/pythonrun.c:1259#21 0x000055e03a518cf4 in _PyRun_SimpleStringFlagsWithName (    command=0x7feb24125a90 "from sqlglot import parse_one; parse_one(\"SELECT * FROM taxi ORDER BY 1 OFFSET 0 ROWS FETCH NEXT 3 ROWS ONLY\").sql()\n", name=0x55e03a6ce96e "<string>", flags=0x7ffeef0ed160) at Python/pythonrun.c:578#22 0x000055e03a55dec7 in pymain_run_command (    command=0x55e05c6afa60 L"from sqlglot import parse_one; parse_one(\"SELECT * FROM taxi ORDER BY 1 OFFSET 0 ROWS FETCH NEXT 3 ROWS ONLY\").sql()\n") at Modules/main.c:261#23 0x000055e03a55f2ad in pymain_run_python (exitcode=0x7ffeef0ed254) at Modules/main.c:682#24 0x000055e03a55f4ae in Py_RunMain () at Modules/main.c:772#25 0x000055e03a55f569 in pymain_main (args=0x7ffeef0ed2d0) at Modules/main.c:802#26 0x000055e03a55f631 in Py_BytesMain (argc=3, argv=0x7ffeef0ed438) at Modules/main.c:826#27 0x000055e03a1849bd in main (argc=3, argv=0x7ffeef0ed438) at ./Programs/python.c:15(gdb) up 4#4  0x000055e03a36ecf3 in _PyUnicode_JoinArray (separator=0x55e03a899bc8 <_PyRuntime+35496>, items=0x7ffeef0e9278, seqlen=4)    at Objects/unicodeobject.c:1038710387        assert(res_data == PyUnicode_1BYTE_DATA(res)(gdb) p res_data$1 = (unsigned char *) 0x7feb2381b97c "\340U"(gdb) p * (PyASCIIObject*) res$5 = {ob_base = {{ob_refcnt_full = 1, {ob_refcnt = 1, ob_overflow = 0, ob_flags = 0}}, ob_type = 0x55e03a872040 <PyUnicode_Type>},   length = 23, hash = -1, state = {interned = 0, kind = 1, compact = 1, ascii = 1, statically_allocated = 0}}(gdb) p * (PyUnicodeObject*) res$6 = {_base = {_base = {ob_base = {{ob_refcnt_full = 1, {ob_refcnt = 1, ob_overflow = 0, ob_flags = 0}},         ob_type = 0x55e03a872040 <PyUnicode_Type>}, length = 23, hash = -1, state = {interned = 0, kind = 1, compact = 1, ascii = 1,         statically_allocated = 0}}, utf8_length = 5629578988226954784,     utf8 = 0x4546203320545845 <error: Cannot access memory at address 0x4546203320545845>}, data = {any = 0x5458454e20484354,     latin1 = 0x5458454e20484354 <error: Cannot access memory at address 0x5458454e20484354>, ucs2 = 0x5458454e20484354,     ucs4 = 0x5458454e20484354}}(gdb) p * (PyCompactUnicodeObject*) res$7 = {_base = {ob_base = {{ob_refcnt_full = 1, {ob_refcnt = 1, ob_overflow = 0, ob_flags = 0}},       ob_type = 0x55e03a872040 <PyUnicode_Type>}, length = 23, hash = -1, state = {interned = 0, kind = 1, compact = 1, ascii = 1,       statically_allocated = 0}}, utf8_length = 5629578988226954784,   utf8 = 0x4546203320545845 <error: Cannot access memory at address 0x4546203320545845>}

(that's just my guesswork of what to print)

CPython versions tested on:

3.14, CPython main branch

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

Python 3.15.0a0 (heads/main:51910dc5620, May 29 2025, 16:12:29) [GCC 14.3.0]

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