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14th chunk of `content/manuals/engine/release-notes/20.10.md`
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* Revert [docker/cli#2960](https://github.com/docker/cli/pull/2960) to fix hanging in `docker start --attach` and remove spurious `Unsupported signal: <nil>. Discarding` messages. [docker/cli#2987](https://github.com/docker/cli/pull/2987).

## 20.10.4
2021-02-26

### Builder

* Fix incorrect cache match for inline cache import with empty layers [moby/moby#42061](https://github.com/moby/moby/pull/42061)
* Update BuildKit to v0.8.2 [moby/moby#42061](https://github.com/moby/moby/pull/42061)
  * resolver: avoid error caching on token fetch
  * fileop: fix checksum to contain indexes of inputs preventing certain cache misses
  * Fix reference count issues on typed errors with mount references (fixing `invalid mutable ref` errors)
  * git: set token only for main remote access allowing cloning submodules with different credentials
* Ensure blobs get deleted in /var/lib/docker/buildkit/content/blobs/sha256 after pull. To clean up old state run `builder prune` [moby/moby#42065](https://github.com/moby/moby/pull/42065)
* Fix parallel pull synchronization regression [moby/moby#42049](https://github.com/moby/moby/pull/42049)
* Ensure libnetwork state files do not leak [moby/moby#41972](https://github.com/moby/moby/pull/41972)

### Client

* Fix a panic on `docker login` if no config file is present [docker/cli#2959](https://github.com/docker/cli/pull/2959)
* Fix `WARNING: Error loading config file: .dockercfg: $HOME is not defined` [docker/cli#2958](https://github.com/docker/cli/pull/2958)

### Runtime

* docker info: silence unhandleable warnings [moby/moby#41958](https://github.com/moby/moby/pull/41958)
* Avoid creating parent directories for XGlobalHeader [moby/moby#42017](https://github.com/moby/moby/pull/42017)
* Use 0755 permissions when creating missing directories [moby/moby#42017](https://github.com/moby/moby/pull/42017)
* Fallback to manifest list when no platform matches in image config [moby/moby#42045](https://github.com/moby/moby/pull/42045) [moby/moby#41873](https://github.com/moby/moby/pull/41873)
* Fix a daemon panic on setups with a custom default runtime configured [moby/moby#41974](https://github.com/moby/moby/pull/41974)
* Fix a panic when daemon configuration is empty [moby/moby#41976](https://github.com/moby/moby/pull/41976)
* Fix daemon panic when starting container with invalid device cgroup rule [moby/moby#42001](https://github.com/moby/moby/pull/42001)
* Fix userns-remap option when username & UID match [moby/moby#42013](https://github.com/moby/moby/pull/42013)
* static: update runc binary to v1.0.0-rc93 [moby/moby#42014](https://github.com/moby/moby/pull/42014)

### Logger

* Honor `labels-regex` config even if `labels` is not set [moby/moby#42046](https://github.com/moby/moby/pull/42046)
* Handle long log messages correctly preventing awslogs in non-blocking mode to split events bigger than 16kB [mobymoby#41975](https://github.com/moby/moby/pull/41975)

### Rootless

* Prevent the service hanging when stopping by setting systemd KillMode to mixed [moby/moby#41956](https://github.com/moby/moby/pull/41956)
* dockerd-rootless.sh: add typo guard [moby/moby#42070](https://github.com/moby/moby/pull/42070)
* Update rootlesskit to v0.13.1 to fix handling of IPv6 addresses [moby/moby#42025](https://github.com/moby/moby/pull/42025)
* allow mknodding FIFO inside userns [moby/moby#41957](https://github.com/moby/moby/pull/41957)

### Security

* profiles: seccomp: update to Linux 5.11 syscall list [moby/moby#41971](https://github.com/moby/moby/pull/41971)

### Swarm

* Fix issue with heartbeat not persisting upon restart [moby/moby#42060](https://github.com/moby/moby/pull/42060)
* Fix potential stalled tasks [moby/moby#42060](https://github.com/moby/moby/pull/42060)
* Fix `--update-order` and `--rollback-order` flags when only `--update-order` or `--rollback-order` is provided [docker/cli#2963](https://github.com/docker/cli/pull/2963)
* Fix `docker service rollback` returning a non-zero exit code in some situations [docker/cli#2964](https://github.com/docker/cli/pull/2964)
Title: Docker Engine 20.10.4: Bug Fixes and Enhancements
Summary
Docker Engine version 20.10.4 includes fixes and enhancements across various components. The builder has improvements for cache matching, BuildKit is updated to v0.8.2, and fixes are included for parallel pull synchronization and libnetwork state leaks. Client issues related to docker login and config file loading have been addressed. Runtime fixes include handling warnings, XGlobalHeader directory creation, manifest list fallback, daemon panics, and userns-remap options. Logger improvements address label regex handling and long log messages. Rootless improvements include systemd KillMode settings, typo guard, rootlesskit updates, and FIFO mknodding. Security updates include seccomp profile updates for Linux 5.11 syscalls. Swarm fixes address heartbeat persistence, stalled tasks, and update/rollback order flags.