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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"RISC-V: \"Illegal instruction\" crash when vector instructions detected by V8","articleBody":"### Version\n\nv26.5.0 (but any v26 and above is affected)\n\n### Platform\n\n```text\nLinux firefly 6.18.3 #2 SMP PREEMPT_DYNAMIC Wed May 13 16:58:11 CST 2026 riscv64 GNU/Linux\n```\n\n### Subsystem\n\nV8\n\n### What steps will reproduce the bug?\n\nrun `npm` or any `node-gyp` on a SpacemiT-K3 board. Also fails in the build-addons step with `make run-ci` as that executes `node-gyp`. Other boards such as the SpacemiT-K1 do not show the crash (Both should have vector instructions available)\n\n### How often does it reproduce? Is there a required condition?\n\n100% of the time\n\n### What is the expected behavior? Why is that the expected behavior?\n\nThere should be no crash when running npm\n\n### What do you see instead?\n\n`Illegal Instruction`\n\n### Additional information\n\nBased on the fact that https://github.com/sxa/node/commit/1ecdd388f13391c55cffd9aea580770e1d26a952 fixes it seems likely that this was introduced as part of the vector instructions introduced in https://github.com/v8/v8/commit/de361fd2544a89c0c94fd820f987378edbb98fce - I haven't yet tracked it down to any specific operation in that function. At the moment I've also only determined that it fixes the initial crash and hopefully that doesn' uncover more issues.\n\nFYI @luhenry @luyahan @nodejs/platform-riscv64 \n\nSplit out from https://github.com/nodejs/build/issues/4099#issuecomment-4935757486","author":{"url":"https://github.com/sxa","@type":"Person","name":"sxa"},"datePublished":"2026-07-16T17:30:54Z","url":"https://github.com/nodejs/node/issues/64538"}