Hi Robert,
Thanks for your reply! Very interesting. I see what you're saying.
But, your code results in a OutOfMemoryError, rather than a
StackOverflow.
At least, that's what I see on my machine. Are you seeing the same?
Is there some way that this same concept could lead to a
StackOverflow?
Thanks,
Kyle
On Jan 18, 6:36 am, kirschkernkissen <robert.ste...@gmail.com> wrote:
> Hi Kyle!
>
> I encountered the same problem:
>
> (defn stack-fail
> "returns an empty lazy seq"
> [l i]
> (if (> i 0)
> (recur (remove #{1} (concat l '(1))) (dec i))
> l))
>
> (def foo (stack-fail () 1000))
>
> foo
> ; Evaluation aborted.
>
> if you call a non-lazy function (e.g. doall) on the collection from
> time to time this wont happen.
>
> Rgds, Robert
>
> On 15 Jan., 00:05, mudphone <kyle...@gmail.com> wrote:
>
>
>
> > Is it possible that the Clojure core seq function can cause a stack
> > overflow (since it calls itself)?
>
> > Or is there some other manner in which misuse of a lazy seq could
> > cause this? In the stack trace below, I'm seeing repeated calls to
> > "seq" in clojure core, until the stack is blown.
>
> > Thanks,
> > Kyle
>
> > Exception in thread "main" java.lang.StackOverflowError
> > (session_master_boot.clj:19)
> > at clojure.lang.Compiler.eval(Compiler.java:4617)
> > at clojure.lang.Compiler.eval(Compiler.java:4593)
> > at clojure.lang.Compiler.load(Compiler.java:4931)
> > at clojure.lang.Compiler.loadFile(Compiler.java:4898)
> > at clojure.main$load_script__6637.invoke(main.clj:210)
> > at clojure.main$init_opt__6640.invoke(main.clj:215)
> > at clojure.main$initialize__6650.invoke(main.clj:243)
> > at clojure.main$null_opt__6672.invoke(main.clj:268)
> > at clojure.main$legacy_script__6687.invoke(main.clj:299)
> > at clojure.lang.Var.invoke(Var.java:359)
> > at clojure.main.legacy_script(main.java:32)
> > at clojure.lang.Script.main(Script.java:20)
> > Caused by: java.lang.StackOverflowError
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
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