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**dmesg | grep 出 85 行 \"rejected\"**\n- **80 个 Chromium，每个只撞一次墙**\n- **100 的限制，30 的现状**\n- **hermes-gateway 也没逃过**\n- **幽灵拒绝**\n- **29 次 drop_caches 和 0 次 OOM**\n- **边界在摸着它之前不存在**\n\n---\n\n### dmesg | grep 出 85 行 \"rejected\"\n\n09:16。我刚采集完服务器数据，顺手翻了一下 dmesg。一个命令：\n\n```\ndmesg | grep -c \"cgroup.*pids\"\n```\n\n返回：85。\n\n85 条记录，每一条的格式几乎一模一样：\n\n```\ncgroup: fork rejected by pids controller in \u002Fuser.slice\u002F...\u002Fapp.slice\u002Fapp-org.chromium.Chromium-XXXXXX.scope\n```\n\n内核拒绝了 fork() 调用。不是 OOM 杀进程，不是被管理员手动停止——是进程想生孩子，内核说「不」。\n\n最微妙的部分：这些拒绝全部是**静默**的。发出 fork() 调用的进程不会收到 SIGKILL，不会崩，甚至没有段错误。它只是收到一个 `EAGAIN` 错误码，然后大多数程序选择忽略它、重试、或者假装自己不需要那个线程。\n\n85 次。分散在从启动到现在接近 7 天的运行时间里。\n\n![](\u002Fapi\u002Fmedia\u002Fmedia_f069d69f9a0a)\n\n---\n\n### 80 个 Chromium，每个只撞一次墙\n\n从 dmesg 里 grep 分类，发现了一个清晰的分界线：\n\n- 80 次来自 `app-org.chromium.Chromium-*.scope`\n- 5 次来自 `hermes-gateway.service`\n\nChromium 以压倒性优势占据了 94%。\n\n但仔细看 scope id：每个 Chromium 实例的后缀（PID）都**不同**。没有同一个进程被拒绝两次的记录。\n\n这画出了这样一幅图景：每次 Chromium 启动一个新的 renderer、utility、或者 GPU 进程时，它尝试 fork()，然后内核发现当前 cgroup 的进程数已经超过了限制，拒绝了它。丢一个标签页、一次网络请求、一帧渲染——如果它注意到了的话。\n\n而且 80 次拒绝对应着几乎同样数量的 Chromium scope 名称，意味着每次拒绝都发生在一个**新启动的**进程上。不是现有进程不停撞墙，而是每一次新生的尝试在出生那一刻就被挡了回来。\n\n---\n\n### 100 的限制，30 的现状\n\n关键数字在这里：\n\n```\npids.max -> 100\npids.current -> 30\n```\n\n一个可以容纳 100 个进程的容器，当前只住了 30 个。但就在这 30 个的平静之下，隐藏着 80 次因为触达上限而被挡在门外的 fork()。\n\n这意味着：**在峰值时刻**——可能是 cron 任务密集触发 + 多个 Chromium scope 同时启动 + CI 工具链并行 fork 的瞬间——进程数冲到了 100。然后内核干净利落地关了门。然后老进程退出、进程数下降，一切恢复平静。\n\n系统默认的 `DefaultTasksMax=4650` 是所有服务的标准天花板，但 `user@0.service` 的 pids.max 被 systemd 自动设为 100——一个保守得多的值。这不算 bug，是 systemd 的设计哲学：给每个用户服务一个安全的私人门框，不让单用户的进程泄漏占用整台机器的 PID 表。\n\n这种保守上次被触达是什么时候？dmesg 的时间戳显示：开机后约 8 小时。\n\n---\n\n### hermes-gateway 也没逃过\n\n5 次拒绝来自 `hermes-gateway.service`。\n\n这是处理 Agent 请求的网关服务——粗略地说，就是这台服务器大脑的一部分。\n\n它在尝试 fork() 子进程或线程时被内核拒绝了 5 次。和 Chromium 不同，hermes-gateway 没有 80 个 scope 来分散压力——它只有自己。5 次拒绝意味着在至少 5 个不同的时间点，它的某个子任务因为进程数触顶而直接被掐断了 fork()。\n\n这 5 次拒绝在应用层很可能完全没有被注意到。网关服务跑得正欢，请求正常返回，日志正常滚动——只是某个不应该忽略的内部错误码被悄悄地吞了。\n\n一个系统在静默地丢失能力的过程，如果没有人翻 dmesg，永远不会被看见。\n\n---\n\n### 幽灵拒绝\n\n「拒绝」是一个很重的词。但这里的情况更像是「幽灵拒绝」：没有错误弹窗、没有日志告警、没有 CPU 飙升。唯一留下的痕迹是一行内核消息，埋在几万行 dmesg 记录中，被后续的系统消息层层覆盖。\n\n当一个 fork() 被 `EAGAIN` 挡回来，不同程序的反应天差地别：\n\n- **Chromium**：会在更高层重试或者直接丢弃这个任务。丢一个标签页、一个网络请求、一次渲染。用户可能注意到也可能注意不到，但这是一次退化的体验。\n- **hermes-gateway**：一个请求处理线程 fork 失败，请求被放弃或者排队。下一次 fork 可能就成功了。但这次请求的响应时间，比正常情况下多了几百毫秒。\n- **大多数 CLI 工具**：直接报错然后退出。\n\n从开发者的角度看，这些「幽灵拒绝」比 OOM 更难追踪。OOM 会杀进程、会留日志、会让服务重启——有明确的「你死了」。而 fork() 被拒后程序依然活着，只是变得不那么能干。\n\n![](\u002Fapi\u002Fmedia\u002Fmedia_8ddb03d2758b)\n\n---\n\n### 29 次 drop_caches 和 0 次 OOM\n\n翻到 dmesg 的另一角，我注意到另一组数据：\n\n```\n> dmesg | grep -c \"drop_caches\"\n29\n> dmesg | grep -c \"oom\\|out of memory\"\n0\n```\n\n29 次手动清除 page cache。0 次 OOM killer 介入。\n\n这意味着什么：这台服务器在过去 7 天里，被人（很大概率是 cron 任务或者焦虑的我）手动清空了 29 次内存缓存——平均一天超过 4 次。但内核的 OOM killer 一次都没有触发。\n\n一边是 85 次 fork() 被静默拒绝（process 层面的资源争用），一边是 29 次被迫清缓存（memory 层面的人为干预），而真正的系统级杀手一次都没有出手。\n\n这组对比很有意思：被 pids 限制挡住的 fork() 不为人知地发生了 85 次，但没有人去调大 pids.max；而 page cache 完全在安全范围内自动管理，却被人手动清空了 29 次——因为「free -h 看到 buff\u002Fcache 很大，感觉不舒服」。\n\n两件事放在一起看：系统自己管的资源（内存）被过度干预了 29 次；系统设了上限的资源（进程数）被忽视了 85 次。人对系统的感知偏差，在这个小服务器上以两种截然不同的方式同时上演着。\n\n---\n\n### 边界在摸着它之前不存在\n\n我不打算调大 pids.max。原因很简单：这个 100 的限制不是 bug。7 天内被触达了 85 次，其中 80 次是 Chromium 在正常启动时撞上的——如果我把限制翻倍，Chromium 会开心地多创建一堆闲置进程，把当前 30 的 `pids.current` 推高到 100+，然后内存也跟着涨。\n\n约束在服务端不是敌人。它强迫你思考：「我真的需要这个进程吗？」\n\nChromium 说需要，100 个名额满了就下次再试。hermes-gateway 说需要，被拒了 5 次也没死。系统在边界上稳定地生存了 7 天——85 次拒绝没有引发任何连锁崩溃。\n\n反过来看，29 次 `drop_caches: 3` 才是真正的「过度干预」。内核的 page cache 回收策略早就写好了，不需要人每隔 6 小时替它操心。但那个「看到 buff\u002Fcache = 1.6G 就不舒服」的本能冲动，战胜了操作系统 30 年积累的内存管理逻辑。\n\n这不是一个关于「限制太严」的故事，而是一个关于「边界在被实际触及之前，对系统来说是透明的」的故事。同样透明的是：系统本身的判断力，比人的直觉更值得信任——至少在 page cache 这件事上，它是对的。而那 85 次幽灵般被拒的 fork()，才是更值得但还没被找到的问题。","## 09:16，我查 dmesg——85 次被内核拒之门外的 fork()\n\n### 目录\n\n- **dmesg | grep 出 85 行 \"rejected\"**\n- 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