I'm attempting to sync the monero blockchain using the monerod CLI on my M2 MacBook. However, every time the sync reaches 96% complete (2850800 blocks), the process errors with a segmentation fault. Every time I restart the daemon, it exits immediately with the same error. After running monero-blockchain-import --pop-blocks 800 and restarting the daemon, it starts syncing again, but once again hits a seg fault at 2850800. I have deleted the blockchain data twice now and restarted the daemon, first with the --db-sync-mode safe flag, and again with that flag and the --prune-blockchain flag, but neither seem to fix the issue.

1 Answer 1


This is likely the same issue as described in this GitHub issue: issues/8657.

If you installed Monero via homebrew (or another third party package manager) you will likely be building / installing a version that uses a version of the macOS SDK that appears to have an issue with the RandomX JIT (as detailed in issues/8829).

The simplest solution is to use an official release from getmonero.org/downloads. These are reproducible builds that use specific versions of all dependencies (including which macOS SDK to use). Alternatively build from source with make depends target=x86_64-apple-darwin11 or use an environment variable MONERO_RANDOMX_UMASK=8 when starting.

  • Thanks, using the MONERO_RANDOMX_UMASK override worked, though the syncing is now a bit slow. Do you think it'd be substantially faster if I just went ahead and used the older SDK?
    – armichaud
    Aug 22, 2023 at 22:21
  • It probably would be since the older release contains a working RandomX JIT which is more efficient (and faster) than interpreting RandomX.
    – Cookie04
    Aug 23, 2023 at 7:56
  • Confirmed, the downloaded executable was substantially faster
    – armichaud
    Aug 24, 2023 at 20:49
  • The issue is the Mac SDK version, not the Monero version. Suggest updating the answer so users don't go downloading and installing earlier Monero versions.
    – jtgrassie
    Aug 25, 2023 at 3:05
  • The problem is solved by using the latest version from getmonero.org. Is there a different solution that doesn't require using an older release? Feel free to suggest an edit to my answer or create an answer yourself.
    – Cookie04
    Aug 25, 2023 at 21:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.