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Merge pull request #10059 from dcantah/ignore-eintr-helper

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pkg/sys: Add helper to ignore eintr
This commit is contained in:
Maksym Pavlenko 2024-04-11 17:25:13 +00:00 committed by GitHub
commit 203f9c2b5b
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GPG Key ID: B5690EEEBB952194
5 changed files with 108 additions and 77 deletions
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17
core/metrics/cgroups/v1/oom.go
View File

@ -25,6 +25,7 @@ import (
"golang.org/x/sys/unix"
cgroups "github.com/containerd/cgroups/v3/cgroup1"
"github.com/containerd/containerd/v2/pkg/sys"
"github.com/containerd/log"
metrics "github.com/docker/go-metrics"
"github.com/prometheus/client_golang/prometheus"
@ -110,16 +111,20 @@ func (o *oomCollector) Close() error {
}
func (o *oomCollector) start() {
var events [128]unix.EpollEvent
var (
n int
err error
events [128]unix.EpollEvent
)
for {
n, err := unix.EpollWait(o.fd, events[:], -1)
if err != nil {
if err == unix.EINTR {
continue
}
if err := sys.IgnoringEINTR(func() error {
n, err = unix.EpollWait(o.fd, events[:], -1)
return err
}); err != nil {
log.L.WithError(err).Error("cgroups: epoll wait failed, OOM notifications disabled")
return
}
for i := 0; i < n; i++ {
o.process(uintptr(events[i].Fd))
}

10
core/mount/mount_idmapped_linux.go
View File

@ -190,13 +190,9 @@ func getUsernsFD(uidMaps, gidMaps []syscall.SysProcIDMap) (_usernsFD *os.File, r
}
func pidfdWaitid(pidFD *os.File) error {
for {
err := unix.Waitid(unix.P_PIDFD, int(pidFD.Fd()), nil, unix.WEXITED, nil)
if err == unix.EINTR {
continue
}
return err
}
return sys.IgnoringEINTR(func() error {
return unix.Waitid(unix.P_PIDFD, int(pidFD.Fd()), nil, unix.WEXITED, nil)
})
}
var (

52
pkg/archive/link_freebsd.go
View File

@ -18,13 +18,13 @@ package archive
import (
"os"
"syscall"
"github.com/containerd/containerd/v2/pkg/sys"
"golang.org/x/sys/unix"
)
func link(oldname, newname string) error {
e := ignoringEINTR(func() error {
e := sys.IgnoringEINTR(func() error {
return unix.Linkat(unix.AT_FDCWD, oldname, unix.AT_FDCWD, newname, 0)
})
if e != nil {
@ -32,51 +32,3 @@ func link(oldname, newname string) error {
}
return nil
}
// The following contents were copied from Go 1.18.2.
// Use of this source code is governed by the following
// BSD-style license:
//
// Copyright (c) 2009 The Go Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// ignoringEINTR makes a function call and repeats it if it returns an
// EINTR error. This appears to be required even though we install all
// signal handlers with SA_RESTART: see #22838, #38033, #38836, #40846.
// Also #20400 and #36644 are issues in which a signal handler is
// installed without setting SA_RESTART. None of these are the common case,
// but there are enough of them that it seems that we can't avoid
// an EINTR loop.
func ignoringEINTR(fn func() error) error {
for {
err := fn()
if err != syscall.EINTR {
return err
}
}
}

37
pkg/oom/v1/v1.go
View File

@ -28,6 +28,7 @@ import (
"github.com/containerd/containerd/v2/core/runtime"
"github.com/containerd/containerd/v2/pkg/oom"
"github.com/containerd/containerd/v2/pkg/shim"
"github.com/containerd/containerd/v2/pkg/sys"
"github.com/containerd/log"
"golang.org/x/sys/unix"
)
@ -67,23 +68,31 @@ func (e *epoller) Close() error {
// Run the epoll loop
func (e *epoller) Run(ctx context.Context) {
var events [128]unix.EpollEvent
var (
n int
err error
events [128]unix.EpollEvent
)
for {
select {
case <-ctx.Done():
e.Close()
return
default:
n, err := unix.EpollWait(e.fd, events[:], -1)
if err != nil {
if err == unix.EINTR {
continue
}
log.G(ctx).WithError(err).Error("cgroups: epoll wait")
err = sys.IgnoringEINTR(func() error {
select {
case <-ctx.Done():
e.Close()
return ctx.Err()
default:
n, err = unix.EpollWait(e.fd, events[:], -1)
return err
}
for i := 0; i < n; i++ {
e.process(ctx, uintptr(events[i].Fd))
})
if err != nil {
if err == context.DeadlineExceeded || err == context.Canceled {
return
}
log.G(ctx).WithError(err).Error("cgroups: epoll wait")
}
for i := 0; i < n; i++ {
e.process(ctx, uintptr(events[i].Fd))
}
}
}

69
pkg/sys/eintr_unix.go Normal file
View File

@ -0,0 +1,69 @@
//go:build !windows
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package sys
import "golang.org/x/sys/unix"
// The following contents were copied from Go 1.18.2.
// Use of this source code is governed by the following
// BSD-style license:
//
// Copyright (c) 2009 The Go Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// IgnoringEINTR makes a function call and repeats it if it returns an
// EINTR error. This appears to be required even though we install all
// signal handlers with SA_RESTART: see #22838, #38033, #38836, #40846.
// Also #20400 and #36644 are issues in which a signal handler is
// installed without setting SA_RESTART. None of these are the common case,
// but there are enough of them that it seems that we can't avoid
// an EINTR loop.
func IgnoringEINTR(fn func() error) error {
for {
err := fn()
if err != unix.EINTR {
return err
}
}
}