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7434caca05
This fixes a segfault on infinite function call recursion (rather than
infinite thunk recursion) by tracking the function call depth in
`EvalState`.
Additionally, to avoid printing extremely long stack traces, stack
frames are now deduplicated, with a `(19997 duplicate traces omitted)`
message. This should only really be triggered in infinite recursion
scenarios.
Before:
$ nix-instantiate --eval --expr '(x: x x) (x: x x)'
Segmentation fault: 11
After:
$ nix-instantiate --eval --expr '(x: x x) (x: x x)'
error: stack overflow
at «string»:1:14:
1| (x: x x) (x: x x)
| ^
$ nix-instantiate --eval --expr '(x: x x) (x: x x)' --show-trace
error:
… from call site
at «string»:1:1:
1| (x: x x) (x: x x)
| ^
… while calling anonymous lambda
at «string»:1:2:
1| (x: x x) (x: x x)
| ^
… from call site
at «string»:1:5:
1| (x: x x) (x: x x)
| ^
… while calling anonymous lambda
at «string»:1:11:
1| (x: x x) (x: x x)
| ^
… from call site
at «string»:1:14:
1| (x: x x) (x: x x)
| ^
(19997 duplicate traces omitted)
error: stack overflow
at «string»:1:14:
1| (x: x x) (x: x x)
| ^
32 lines
753 B
Markdown
32 lines
753 B
Markdown
---
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synopsis: Some stack overflow segfaults are fixed
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issues: 9616
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prs: 9617
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---
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The number of nested function calls has been restricted, to detect and report
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infinite function call recursions. The default maximum call depth is 10,000 and
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can be set with [the `max-call-depth`
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option](@docroot@/command-ref/conf-file.md#conf-max-call-depth).
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This fixes segfaults or the following unhelpful error message in many cases:
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error: stack overflow (possible infinite recursion)
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Before:
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```
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$ nix-instantiate --eval --expr '(x: x x) (x: x x)'
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Segmentation fault: 11
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```
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After:
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```
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$ nix-instantiate --eval --expr '(x: x x) (x: x x)'
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error: stack overflow
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at «string»:1:14:
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1| (x: x x) (x: x x)
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| ^
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```
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