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[LoongArch64] Execution crash: V8 Fatal error "AssembleArchSelect Unimplemented arch_opcode is : 209" #63721
Description
Version
main
Platform
Linux 90 6.9.0-rc3_default #1 SMP PREEMPT Thu Apr 11 12:24:48 UTC 2024 loongarch64 GNU/Linux
Subsystem
v8
What steps will reproduce the bug?
- Successfully compile Node.js on a LoongArch64 architecture machine.
- Run the command to generate documentation, which executes the newly built node binary:
make out/doc/api/addons.html
Error Log:
[loongarch@90 node]$ make out/doc/api/addons.html
npm warn cli npm v11.16.0 does not support Node.js v27.0.0-pre. This version of npm supports the following node versions: `^20.17.0 || >=22.9.0`. You can find the latest version at https://nodejs.org/.
added 369 packages, and audited 371 packages in 10s
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found 0 vulnerabilities
mkdir -p out/doc/api
cp -r doc/api out/doc
AssembleArchSelect Unimplemented arch_opcode is : 209
UNIMPLEMENTED code_generator_loong64: AssembleArchSelect at line 4732
#
# Fatal error in , line 0
# unimplemented code
#
#
#
#FailureMessage Object: 0x7fffee5105c0
----- Native stack trace -----
1: 0x5555571b1748 [/home/loongarch/liujh/node/node]
2: 0x5555596649f0 V8_Fatal(char const*, ...) [/home/loongarch/liujh/node/node]
3: 0x555559d00344 [/home/loongarch/liujh/node/node]
4: 0x55555a075db0 [/home/loongarch/liujh/node/node]
5: 0x55555a0776bc [/home/loongarch/liujh/node/node]
6: 0x555559813558 [/home/loongarch/liujh/node/node]
7: 0x55555981efd8 [/home/loongarch/liujh/node/node]
8: 0x55555979c5c4 [/home/loongarch/liujh/node/node]
9: 0x55555803e38c [/home/loongarch/liujh/node/node]
10: 0x55555804feb4 [/home/loongarch/liujh/node/node]
11: 0x555558051b00 [/home/loongarch/liujh/node/node]
12: 0x5555588ac85c [/home/loongarch/liujh/node/node]
13: 0x5555571b2774 [/home/loongarch/liujh/node/node]
14: 0x7fffeff7a454 [/usr/lib64/libc.so.6]
15: 0x7fffeffff8cc [/usr/lib64/libc.so.6]
make: *** [Makefile:886: out/doc/api/addons.html] Error 133
How often does it reproduce? Is there a required condition?
Always reproduces on LoongArch64 when executing the make out/doc/api/addons.html command.
This has been fixed in the latest commit for the v8 loong64 architecture.
(Ref: https://chromium-review.googlesource.com/c/v8/v8/+/7801520).
I verified this locally by patching deps/v8. With the patch applied, make out/doc/api/addons.html runs successfully and the crash is completely resolved.
What is the expected behavior? Why is that the expected behavior?
The command make out/doc/api/addons.html should complete successfully without crashing, and the Node.js binary should execute normally on LoongArch64.
What do you see instead?
While the Node.js compilation succeeds, executing the resulting binary causes a V8 fatal error. The process fails with AssembleArchSelect Unimplemented arch_opcode is : 209.
Additional information
No response
Activity
juanarbol commentedon Jun 3, 2026
cc// @targos, this is not landing cleanly.
This v8/v8@c4d06ba is only on V8 v15 series, I could backport this one, but you're the expert, how to trace missing patches and stuff?
Javonne-liu commentedon Jun 3, 2026
Thanks for looking into this and pulling in the right folks!
I saw the context mismatch too, so I resolved the conflicts for the current deps/v8 codebase. The corresponding PR has now been submitted.
Really appreciate your support on this.
deps: V8: backport c4d06ba586f3
deps: V8: backport c4d06ba586f3
deps: V8: backport c4d06ba586f3
deps: V8: backport c4d06ba586f3