bug#58631: [Shepherd] Indefinite heap growth (memory leak)

[Maxime Devos]

On 29-10-2022 12:01, Ludovic Courtès wrote:

The attached Fibers program illustrates the problem: heap grows even
though it’s not supposed to.

If I add (gc) before the (pk 'heap-size ...), I can't reproduce:

;;; (heap-size 12742656)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

(another run)

;;; (heap-size 4976640)

;;; (heap-size 8855552)

;;; (heap-size 12029952)

;;; (heap-size 12029952)

;;; (heap-size 12029952)



;;; (heap-size 12742656)

;;; (heap-size 12742656)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)

;;; (heap-size 12808192)
;; <--- here's the jump
;;; (heap-size 23359488)

;;; (heap-size 23359488)

;;; (heap-size 23359488)

;;; (heap-size 23359488)

;;; (heap-size 23359488)

;;; (heap-size 23359488)

;;; (heap-size 23359488)

;;; (heap-size 23359488)

;;; (heap-size 23359488)

(This is in a "guix shell guile guile-fibers" environment)

Greetings,
Maxime.

However, if I increase the number of seconds waited, I can eventually reproduce some heap growth:

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