From 5159ecfcc9180dd47e843818844c59cb9284d662 Mon Sep 17 00:00:00 2001
From: zhongjiawei <zhongjiawei1@huawei.com>
Date: Thu, 5 Jan 2023 16:36:48 +0800
Subject: [PATCH] runc: print memory info when syscall.Exec failed

---
 libcontainer/container_linux.go     |  1 +
 libcontainer/standard_init_linux.go | 33 ++++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/libcontainer/container_linux.go b/libcontainer/container_linux.go
index 10890c1..5ef5a9a 100644
--- a/libcontainer/container_linux.go
+++ b/libcontainer/container_linux.go
@@ -355,6 +355,7 @@ func (c *linuxContainer) start(process *Process) (retErr error) {
 	}
 
 	if err := parent.start(); err != nil {
+		printCgroupInfo(c.config.Cgroups.Path)
 		return fmt.Errorf("unable to start container process: %w", err)
 	}
 
diff --git a/libcontainer/standard_init_linux.go b/libcontainer/standard_init_linux.go
index b202ba9..8a60501 100644
--- a/libcontainer/standard_init_linux.go
+++ b/libcontainer/standard_init_linux.go
@@ -3,8 +3,10 @@ package libcontainer
 import (
 	"errors"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"strconv"
 	"time"
 
@@ -274,5 +276,34 @@ func (l *linuxStandardInit) Init() error {
 		return err
 	}
 
-	return system.Exec(name, l.config.Args[0:], os.Environ())
+	if err := system.Exec(name, l.config.Args[0:], os.Environ()); err != nil {
+		printCgroupInfo("")
+		return err
+	}
+	return nil
 }
+
+func printCgroupInfo(path string) {
+	cgroupRoot := "/sys/fs/cgroup"
+	infoFileList := []string{
+		"/proc/meminfo",
+		"/sys/fs/cgroup/memory/memory.stat",
+		filepath.Join(cgroupRoot, "files", path, "files.limit"),
+		filepath.Join(cgroupRoot, "files", path, "files.usage"),
+		filepath.Join(cgroupRoot, "pids", path, "pids.max"),
+		filepath.Join(cgroupRoot, "pids", path, "pids.current"),
+		filepath.Join(cgroupRoot, "memory", path, "memory.usage_in_bytes"),
+		filepath.Join(cgroupRoot, "memory", path, "memory.limit_in_bytes"),
+		filepath.Join(cgroupRoot, "memory", path, "memory.stat"),
+		filepath.Join(cgroupRoot, "cpu", path, "cpu.stat"),
+	}
+	for _, file := range infoFileList {
+		printFileContent(file)
+	}
+}
+
+func printFileContent(path string) {
+	output, err := ioutil.ReadFile(path)
+	logrus.Infof("content read from %s: %s, err: %v", path, string(output), err)
+}
+
-- 
2.30.0