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59a566db13
builtins.deepSeq on deeply nested structures (e.g., a linked list with 100,000 elements) caused an uncontrolled OS-level stack overflow with no Nix stack trace. Fix by adding call depth tracking to forceValueDeep, integrating with Nix's existing max-call-depth mechanism. Now produces a controlled "stack overflow; max-call-depth exceeded" error with a proper stack trace. Closes: https://github.com/NixOS/nix/issues/7816
30 lines
1.4 KiB
Text
30 lines
1.4 KiB
Text
error:
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… while calling the 'deepSeq' builtin
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at /pwd/lang/eval-fail-deepseq-stack-overflow.nix:8:1:
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7| in
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8| builtins.deepSeq reverseLinkedList (
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| ^
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9| throw "unexpected success; expected a controlled stack overflow instead"
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… while evaluating the attribute 'tail'
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at /pwd/lang/eval-fail-deepseq-stack-overflow.nix:6:67:
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5| long = builtins.genList (x: x) 100000;
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6| reverseLinkedList = builtins.foldl' (tail: head: { inherit head tail; }) null long;
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| ^
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7| in
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(9997 duplicate frames omitted)
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… while evaluating the attribute 'head'
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at /pwd/lang/eval-fail-deepseq-stack-overflow.nix:6:62:
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5| long = builtins.genList (x: x) 100000;
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6| reverseLinkedList = builtins.foldl' (tail: head: { inherit head tail; }) null long;
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| ^
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7| in
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error: stack overflow; max-call-depth exceeded
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at /pwd/lang/eval-fail-deepseq-stack-overflow.nix:5:28:
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4| let
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5| long = builtins.genList (x: x) 100000;
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| ^
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6| reverseLinkedList = builtins.foldl' (tail: head: { inherit head tail; }) null long;
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