[Factor-builds] mason on macosx-x86-64: build loop error

[<sl...@fa...>]

Fatal error on shill.local

Process:
T{ process
    { command
        {
            "scp"
            "boot.unix-x86.64.image"
            "sla...@do...:/home/slava_pestov/downloads.factorcode.org/images/clean//macosx-x86-64"
        }
    }
    { environment H{ } }
    { environment-mode +append-environment+ }
    { stdin +closed+ }
    { stdout T{ fd { disposed t } { fd 14 } } }
    { stderr +stdout+ }
    { group +new-group+ }
    { timeout T{ duration { minute 30 } } }
    { status 255 }
    { pipe
        T{ pipe
            { in T{ fd { disposed t } { fd 13 } } }
            { out T{ fd { disposed t } { fd 14 } } }
        }
    }
}

Output:
fork: Resource temporarily unavailable

(U) Quotation: [ set-namestack init-catchstack self quot>> call -> stop ]
(O) Word: build-loop
(O) Word: build
(O) Word: release
(O) Word: update-clean-branch
(O) Word: upload-clean-image
(O) Word: try-output-process
(O) Word: output-process-error
(O) Method: M\ object throw
(U) Quotation: [
        65 special-object error-thread set-global
        continuation -> error-continuation set-global
        [ original-error set-global ] [ rethrow ] bi
    ]