Pin BuildKit image used for Docker Hub multi-arch builds - #2522
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MuhammadTahaNaveed merged 1 commit intoAug 19, 2026
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The docker-container buildx driver boots moby/buildkit:buildx-stable-1, a moving tag that has advanced to BuildKit v0.32.x. That release bundles runc v1.4.3, which mounts masked-path tmpfs with nr_inodes=1 and is rejected by the Docker Hub build host kernel, so every RUN step fails during container init (opencontainers/runc#5348, fixed in runc 1.4.4). Pin to v0.31.2, the last BuildKit release predating the runc 1.4.3 bump. Remove the pin once BuildKit ships runc >= 1.4.4.
jrgemignani
requested review from
MuhammadTahaNaveed and
gregfelice
and
a lite review from Copilot
August 19, 2026 00:34
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Pull request overview
Pins the BuildKit image used by the Docker Hub multi-arch buildx docker-container builder to avoid Docker Hub host incompatibilities introduced by the moving moby/buildkit:buildx-stable-1 tag.
Changes:
- Pin the buildx driver’s BuildKit image to
moby/buildkit:v0.31.2. - Add an inline comment documenting why the pin exists (runc 1.4.3 masked-path setup failure).
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MuhammadTahaNaveed
approved these changes
Aug 19, 2026
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The docker-container buildx driver boots moby/buildkit:buildx-stable-1, a moving tag that has advanced to BuildKit v0.32.x. That release bundles runc v1.4.3, which mounts masked-path tmpfs with nr_inodes=1 and is rejected by the Docker Hub build host kernel, so every RUN step fails during container init (opencontainers/runc#5348, fixed in runc 1.4.4).
Pin to v0.31.2, the last BuildKit release predating the runc 1.4.3 bump. Remove the pin once BuildKit ships runc >= 1.4.4.