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# Special exit codes for build failure
1xx status codes are used when requested builds failed.
The following codes are in use:
- `100` Generic build failure
The builder process returned with a non-zero exit code.
- `101` Build timeout
The build was aborted because it did not complete within the specified `timeout`.
- `102` Hash mismatch
The build output was rejected because it does not match the
[`outputHash` attribute of the derivation](@docroot@/language/advanced-attributes.md).
- `104` Not deterministic
The build succeeded in check mode but the resulting output is not binary reproducible.
With the `--keep-going` flag it's possible for multiple failures to occur.
In this case the 1xx status codes are or combined using
[bitwise OR](https://en.wikipedia.org/wiki/Bitwise_operation#OR).
```
0b1100100
^^^^
|||`- timeout
||`-- output hash mismatch
|`--- build failure
`---- not deterministic
```
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