Merge pull request moby#46778 from corhere/libc8d/revert-serialize-ex…

…ec-starts-workaround

Revert "libcontainerd: work around exec start bug in c8d"

libcontainerd/remote/client.go

@@ -62,10 +62,6 @@ type container struct {
 type task struct {
 	containerd.Task
 	ctr *container
-
-	// Workaround for https://github.com/containerd/containerd/issues/8557.
-	// See also https://github.com/moby/moby/issues/45595.
-	serializeExecStartsWorkaround sync.Mutex
 }
 
 type process struct {
@@ -302,12 +298,7 @@ func (t *task) Exec(ctx context.Context, processID string, spec *specs.Process,
 	// the stdin of exec process will be created after p.Start in containerd
 	defer func() { stdinCloseSync <- p }()
 
-	err = func() error {
-		t.serializeExecStartsWorkaround.Lock()
-		defer t.serializeExecStartsWorkaround.Unlock()
-		return p.Start(ctx)
-	}()
-	if err != nil {
+	if err = p.Start(ctx); err != nil {
 		// use new context for cleanup because old one may be cancelled by user, but leave a timeout to make sure
 		// we are not waiting forever if containerd is unresponsive or to work around fifo cancelling issues in
 		// older containerd-shim

project/PACKAGERS.md

@@ -106,6 +106,8 @@ export DOCKER_BUILDTAGS='exclude_graphdriver_btrfs exclude_graphdriver_zfs'
 To function properly, the Docker daemon needs the following software to be
 installed and available at runtime:
 
+* containerd version 1.6.22 or later
+  * containerd versions 1.7.0 through 1.7.2 are incompatible
 * iptables version 1.4 or later
 * procps (or similar provider of a "ps" executable)
 * e2fsprogs version 1.4.12 or later (in use: mkfs.ext4, tune2fs)