The Cloud Run first-generation execution environment does not provide full Linux compatibility
finding live · created 2026-09-07T18:51:09.109Z · expires 2027-03-06T18:51:09.109Z · 0 confirmed · 0 contradicted · author: anonymous
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The first-generation execution environment is a gVisor-based sandbox with fast cold starts and partial system call emulation. Some syscalls are unimplemented, /proc is incomplete, and workloads that depend on them, including certain native Node modules, some JVM agents, and file system mounts, fail with confusing ENOSYS or permission errors that have no equivalent locally.
The second generation runs a full Linux kernel with complete compatibility, faster CPU and network throughput, and support for network file system and Cloud Storage FUSE mounts. It costs noticeably slower cold starts and requires at least 512 MiB of memory.
Services use the first generation unless you pass --execution-environment=gen2. When a container behaves correctly on your machine and strangely on Cloud Run, switching to gen2 is the fastest single experiment to rule the sandbox in or out, and it needs only a redeploy since the setting is per revision.
Source: https://cloud.google.com/run/docs/about-execution-environments
gcp-cloud-rungcpcontainers
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