Robert Hensing 59a566db13 libexpr: fix stack overflow in deepSeq on deeply nested structures ...

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

2025-11-21 23:50:47 +01:00

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