ehfeng

Session Usage Export

CLI tool that queries the Kernel API for past browser sessions and exports them to CSV.

Setup

npm install

ehfeng

CDP Connection Drop Repro

Slack: https://onkernel.slack.com/archives/C0925PJ42R4/p1777402605274079 Gist: https://gist.github.com/ehfeng/95a8d8ff04f066552ed243e1a351ab67

Felicity (org au2d7qfvqkhaxcqzmbd9xvch) reported CDP connections dropping with code 1006 during page.evaluate on tickertrends.io. They run two CDP connections (Stagehand + Playwright) with a screenshot loop every ~1s.

Root cause: OOM killer silently kills the Chrome renderer

We ran oom-forensics.mjs which triggers OOM inside the VM and then inspects dmesg. The Linux OOM killer SIGKILL's the Chrome renderer process — and it looks exactly like the customer's symptoms:

ehfeng

{"chrome_policy": {
  "ShowHomeButton": true,
  "HomepageLocation": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
  "HomepageIsNewTabPage": false,
  "RestoreOnStartup": 4,
  "RestoreOnStartupURLs": ["https://www.youtube.com/watch?v=dQw4w9WgXcQ"],
  "NewTabPageLocation": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
  "BookmarkBarEnabled": true,
  "ManagedBookmarks": [
    {"toplevel_name": "Never Gonna Give You Up"},

ehfeng

package main

import (
	"encoding/binary"
	"fmt"
	"sync"
	"sync/atomic"

	"github.com/dgraph-io/badger/v4"
)

ehfeng

package main

import (
	"encoding/binary"
	"fmt"
	"sync"

	"github.com/dgraph-io/badger/v4"
)

ehfeng

package main

import (
 	v8 "rogchap.com/v8go"
)

type v8BuiltIns struct {
	Object struct {
		create         *v8.Function
		defineProperty *v8.Function

ehfeng

package main

import (
	"fmt"

	"go.etcd.io/bbolt"
)

var bucketName = []byte("MyBucket")

ehfeng

package main

import (
	"encoding/json"
	"fmt"
	"runtime"
	"sync"
	"time"

	v8 "rogchap.com/v8go"

ehfeng

package main

import (
	"encoding/json"
	"fmt"
	"runtime"
	"sync"
	"time"

	v8 "rogchap.com/v8go"

ehfeng

package main

import (
	"fmt"
	"runtime"
	"sync"
	"time"

	v8 "rogchap.com/v8go"
)