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juliacall: Julia GC triggered from a python thread causes hangs

Aperta
  • Qualcosa non va?
#578 3 commenti 1 reazione 0 assegnatari Vedi su GitHub

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
30/100
Tipo di issue
Bug
Chiarezza
Da chiarire
Stato di attività
Ferma
Stack tecnologico
julia, python
Ambito
backend

Direzione di ricerca

Inizia eseguendo il riproduttore di threading Python fornito con JuliaCall e ispeziona i percorsi di chiamata di PythonCall JlWrap/any.jl e JlWrap/base.jl mostrati nello stack trace. Confronta il comportamento con il GC di Julia abilitato e disabilitato; il lavoro è completato quando la chiamata GC eseguita dal thread termina senza bloccarsi negli ambienti riportati.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

bug

Affects: JuliaCall

Describe the bug
I am seeing Julia tasks launched from parallel python threads lead to sporadic hangs. Short-running tasks suffer less from this. I had no luck using the tricks from #539 or here. I think the hangs are triggered by Julia GC - disabling GC with Base.GC.enable(false) beforehand seems to fix the hangs - and triggering Julia GC manually from a python thread immediately causes a hang.

This is all with PYTHON_JULIACALL_HANDLE_SIGNALS set to yes, in case that matters.

from juliacall import Main as jl
jl_gc = jl.Base.GC.gc

import threading
t = threading.Thread(target=jl_gc)
t.start()  # hangs every time (100% CPU)

Terminating python gives me

[89363] signal (15): Terminated: 15
in expression starting at none:0
jl_gc_wait_for_the_world at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gc.c:241 [inlined]
ijl_gc_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gc.c:3515
gc at ./gcutils.jl:129 [inlined]
gc at ./gcutils.jl:129 [inlined]
pyjlany_call at /Users/username/.julia/packages/PythonCall/Nr75f/src/JlWrap/any.jl:45
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:3077
(pyproj) c889f3b4c8d7:pyproj username$ _pyjl_callmethod at /Users/username/.julia/packages/PythonCall/Nr75f/src/JlWrap/base.jl:73
_pyjl_callmethod at /Users/username/.julia/packages/PythonCall/Nr75f/src/JlWrap/C.jl:63
jfptr__pyjl_callmethod_9032 at /Users/username/.julia/compiled/v1.10/PythonCall/WdXsa_v1O0R.dylib (unknown line)
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:3077
jlcapi__pyjl_callmethod_9116 at /Users/username/.julia/compiled/v1.10/PythonCall/WdXsa_v1O0R.dylib (unknown line)
method_vectorcall_VARARGS at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
PyObject_Vectorcall at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyEval_EvalFrameDefault at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyObject_FastCallDictTstate at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
slot_tp_call at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyObject_Call at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyEval_EvalFrameDefault at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
method_vectorcall at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
thread_run at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
pythread_wrapper at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_pthread_start at /usr/lib/system/libsystem_pthread.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
Allocations: 3689147 (Pool: 3684864; Big: 4283); GC: 6

Your system

  • MacOS, Apple Silicon, Julia 1.10.5
  • Linux, x86_64, Julia 1.10.6
  • PythonCall/juliacall 0.9.23
Lingua principale
Julia
Stelle
1.1k
Fork
89
Merge medio
2g 15h
PR unite (30g)
7

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