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Windows: Retry loop to fix HCS race condition enumerating containers 

Signed-off-by: John Howard <jhoward@microsoft.com>

This fixes https://github.com/docker/docker/issues/30278 where
there is a race condition in HCS for RS1 and RS2 builds, and enumeration
of compute systems can return access is denied if a silo is being
torn down in the kernel while HCS is attempting to enumerate them.
This commit is contained in:
John Howard 2017-02-14 16:36:35 -08:00
parent 9983a7b88f
commit 83a2db2097
1 changed files with 24 additions and 7 deletions
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31
daemon/graphdriver/windows/windows.go
View File

@ -31,6 +31,7 @@ import (
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/longpath"
"github.com/docker/docker/pkg/reexec"
"github.com/docker/docker/pkg/system"
units "github.com/docker/go-units"
"golang.org/x/sys/windows"
)
@ -265,19 +266,35 @@ func (d *Driver) Remove(id string) error {
// it is a transient error. Retry until it succeeds.
var computeSystems []hcsshim.ContainerProperties
retryCount := 0
osv := system.GetOSVersion()
for {
// Get and terminate any template VMs that are currently using the layer
// Get and terminate any template VMs that are currently using the layer.
// Note: It is unfortunate that we end up in the graphdrivers Remove() call
// for both containers and images, but the logic for template VMs is only
// needed for images - specifically we are looking to see if a base layer
// is in use by a template VM as a result of having started a Hyper-V
// container at some point.
//
// We have a retry loop for ErrVmcomputeOperationInvalidState and
// ErrVmcomputeOperationAccessIsDenied as there is a race condition
// in RS1 and RS2 building during enumeration when a silo is going away
// for example under it, in HCS. AccessIsDenied added to fix 30278.
//
// TODO @jhowardmsft - For RS3, we can remove the retries. Also consider
// using platform APIs (if available) to get this more succinctly. Also
// consider enlighting the Remove() interface to have context of why
// the remove is being called - that could improve efficiency by not
// enumerating compute systems during a remove of a container as it's
// not required.
computeSystems, err = hcsshim.GetContainers(hcsshim.ComputeSystemQuery{})
if err != nil {
if err == hcsshim.ErrVmcomputeOperationInvalidState {
if retryCount >= 5 {
// If we are unable to get the list of containers
// go ahead and attempt to delete the layer anyway
// as it will most likely work.
if (osv.Build < 15139) &&
((err == hcsshim.ErrVmcomputeOperationInvalidState) || (err == hcsshim.ErrVmcomputeOperationAccessIsDenied)) {
if retryCount >= 500 {
break
}
retryCount++
time.Sleep(2 * time.Second)
time.Sleep(10 * time.Millisecond)
continue
}
return err