SymPy.jl not threadsafe?
オープン
まだ誰も着手していません。
評価
- 難易度
- 4/5
- 見積もり時間
- 3〜5日
- 初心者へのやさしさ
- 30/100
調査の方向性
提供された Julia REPL の MWE を Threads.@threads を使って再現し、stack trace で示されている SymPy.jl/PyCall の境界を調査する。どのスレッド操作がサポートされているかを判断し、回帰テストまたは明示的に文書化された動作によって結果を検証可能にする。
索引モデルが issue の本文から書いたものです。
説明
While working with polynomials in SymPy.jl I encountered segfaults when using Julia threads. MWE:
julia> using SymPy
julia> @syms a
(a,)
julia> p = sympy.Poly(a^2 + 3*a -2, a)
Poly(a**2 + 3*a - 2, a, domain='ZZ')
julia> for i in 0:2; @show p.coeff_monomial(a^i); end
p.coeff_monomial(a ^ i) = -2
p.coeff_monomial(a ^ i) = 3
p.coeff_monomial(a ^ i) = 1
julia> Threads.@threads for i in 0:2; @show p.coeff_monomial(a^i); end
signal (11): Segmentation fault
in expression starting at REPL[12]:1
signal (11): Segmentation fault
in expression starting at REPL[12]:1
PyObject_GC_Del at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Malloc at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_GC_Malloc at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_GC_New at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyTraceBack_FromFrame at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyTraceBack_Here at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCallDict at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Call_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
slot_tp_init at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
type_call.lto_priv.242 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_MakeTpCall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCall_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
slot_tp_richcompare at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyObject_RichCompare at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyObject_RichCompareBool at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCallDict at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Call_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
tuplerichcompare.lto_priv.211 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyObject_RichCompare at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
slot_tp_init at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
type_call.lto_priv.242 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_MakeTpCall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
method_vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCallDict at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
method_vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Call_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyVectorcall_Call at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
macro expansion at /home/goran/.julia/packages/PyCall/BD546/src/exception.jl:95 [inlined]
#107 at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:43 [inlined]
disable_sigint at ./c.jl:458 [inlined]
__pycall! at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:42 [inlined]
_pycall! at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:29
_pycall! at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:11
unknown function (ip: 0x7f8fd7194263)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
#_#114 at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:86
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
slot_tp_init at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
do_apply at /buildworker/worker/package_linux64/build/src/builtins.c:670
PyObject at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:86
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
macro expansion at ./show.jl:955 [inlined]
macro expansion at ./REPL[12]:1 [inlined]
#21#threadsfor_fun at ./threadingconstructs.jl:81
#21#threadsfor_fun at ./threadingconstructs.jl:48
unknown function (ip: 0x7f8fd719616c)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
type_call.lto_priv.242 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
_PyObject_MakeTpCall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
start_task at /buildworker/worker/package_linux64/build/src/task.c:839
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
unknown function (ip: (nil))
Allocations: 9128275 (Pool: 9125487; Big: 2788); GC: 11
Segmentation fault
Is this only problematic with some functions or is SymPy.jl in general not threadsafe?
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