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Use Serial GC with capped address space for linux-x86_64 binary - #136
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G1 in a static musl image falls back to the legacy vsyscall getcpu, which segfaults on kernels with vsyscall=none such as WSL2 (#86). Cap the reserved heap address space so the binary still starts under ulimit -v (#46), and check that in the smoke test. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes #86.
Cause: with
--gc=G1, the static musl image runs HotSpot'ssched_getcpu_init()at startup. In a static musl binarydlsym(RTLD_DEFAULT, "sched_getcpu")returns null, so it falls back to calling the legacy vsyscallgetcpuat0xffffffffff600800. On kernels booted withvsyscall=none(e.g. WSL2) that page isn't mapped, so the binary segfaults on startup.Fix: go back to the default Serial GC. G1 was introduced in #63 to fix #46: with default settings, Serial GC reserves a large heap address space and fails under
ulimit -vwithFailed to create the main Isolate. To keep #46 fixed, this caps the reservation with-R:ReservedAddressSpaceSize=512m. The heap is already capped atMaxHeapSize=100M.The smoke test now also runs the binary with
ulimit -vset to 2 GB and 1 GB, to cover #46.🤖 Generated with Claude Code