Robert Hensing fd1ecfbfc8 libexpr: fix stack overflow in printAmbiguous on deeply nested structures
printAmbiguous (used by nix-instantiate --eval and nix-env) had a depth
parameter, but all callers passed INT_MAX, effectively disabling the
limit. The function relied on the C++ stack to eventually overflow,
which could cause uncontrolled SIGSEGV crashes on deeply nested
pre-forced structures.

Now printAmbiguous checks depth against max-call-depth (default 10000)
and throws StackOverflowError with a proper trace, consistent with
other recursive value traversal functions.

The function signature is updated to take EvalState& to access the
settings and throw proper errors. The depth parameter now counts up
from 0 instead of down from INT_MAX.
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Nix

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Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation and first steps

Visit nix.dev for installation instructions and beginner tutorials.

Full reference documentation can be found in the Nix manual.

Building and developing

Follow instructions in the Nix reference manual to set up a development environment and build Nix from source.

Contributing

Check the contributing guide if you want to get involved with developing Nix.

Additional resources

Nix was created by Eelco Dolstra and developed as the subject of his PhD thesis The Purely Functional Software Deployment Model, published 2006. Today, a world-wide developer community contributes to Nix and the ecosystem that has grown around it.

License

Nix is released under the LGPL v2.1.

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