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ci: Doc ASLR workaround for sanitizer tasks #33674

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Oct 23, 2025
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ci: Doc ASLR workaround for sanitizer tasks #33674

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8 changes: 8 additions & 0 deletions ci/README.md
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Expand Up @@ -20,6 +20,14 @@ requires `bash`, `docker`, and `python3` to be installed. To run on different ar
sudo apt install bash docker.io python3 qemu-user-static
```

For some sanitizer builds, the kernel's address-space layout randomization
(ASLR) entropy can cause sanitizer shadow memory mappings to fail. When running
the CI locally you may need to reduce that entropy by running:

```
sudo sysctl -w vm.mmap_rnd_bits=28
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What does -w do?

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       -w, --write
              Force all arguments to be write arguments and print an error if they cannot be parsed this way.

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Yeah, seems preferable to always use the long option name for self-documenting code to avoid confusion. Can be changed in a follow-up, as this is merged.

```

It is recommended to run the ci system in a clean env. To run the test stage
with a specific configuration,

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