ci: Doc ASLR workaround for sanitizer tasks #33674

pull maflcko wants to merge 1 commits into bitcoin:master from maflcko:2510-ci-doc-aslr changing 1 files +8 −0

maflcko commented at 7:15 AM on October 22, 2025: member

Fixes https://github.com/bitcoin/bitcoin/issues/30674
ci: Doc ASLR workaround for sanitizer tasks fa0e36156c
DrahtBot added the label Tests on Oct 22, 2025
DrahtBot commented at 7:15 AM on October 22, 2025: contributor



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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33674.



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ACK fanquake

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maflcko requested review from Sjors on Oct 22, 2025
fanquake commented at 7:18 AM on October 23, 2025: member

ACK fa0e36156cba535846ae2ecfaaa554d7f14fcdfd
fanquake merged this on Oct 23, 2025
fanquake closed this on Oct 23, 2025
maflcko deleted the branch on Oct 23, 2025

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ACK	fanquake

in ci/README.md:28 in fa0e36156c

  19 | @@ -20,6 +20,14 @@ requires `bash`, `docker`, and `python3` to be installed. To run on different ar
  20 |  sudo apt install bash docker.io python3 qemu-user-static
  21 |  ```
  22 |  
  23 | +For some sanitizer builds, the kernel's address-space layout randomization
  24 | +(ASLR) entropy can cause sanitizer shadow memory mappings to fail. When running
  25 | +the CI locally you may need to reduce that entropy by running:
  26 | +
  27 | +```
  28 | +sudo sysctl -w vm.mmap_rnd_bits=28

Sjors commented at 10:40 AM on October 24, 2025:

What does -w do?

Sjors commented at 10:41 AM on October 24, 2025:

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

maflcko commented at 12:54 PM on October 24, 2025:

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.

Sjors commented at 10:41 AM on October 24, 2025: member

Post merge ACK

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#30674 TSAN/MSAN fails with vm.mmap_rnd_bits=32 even with llvm 18.1.3

ci: Doc ASLR workaround for sanitizer tasks #33674

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