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    • [Feedback on issues] service-manager:dde 进程 QThread 99.9% CPU 空转
    deepin 25 347 views · 11 replies ·
    Tofloor
    poster avatar
    150******77
    deepin
    2026-09-22 02:35
    Author

    【标题】service-manager:dde 进程 QThread 99.9% CPU 空转（X11 socket 数据积压导致）

    【系统环境】

    • 系统版本：[Version]
      SystemName=Deepin
      SystemName[zh_CN]=深度操作系统
      ProductType=Desktop
      ProductType[zh_CN]=桌面
      EditionName=Community
      EditionName[en_US]=Community
      EditionName[zh_CN]=社区版
      MajorVersion=25
      MinorVersion=25.2.2
      OsBuild=21138.103.100
    • 内核版本：Linux zxs-PC 6.18.48-amd64-desktop-rolling #25.01.01.35 SMP PREEMPT_DYNAMIC Mon Aug 31 10:31:28 CST 2026 x86_64 GNU/Linux
    • 架构：amd64
    • 软件包版本：
      ii dde-file-manager-services-plugins 6.6.3 amd64 deepin desktop-environment - deepin-service-manager plugins module
      ii dde-session 2.0.30 amd64 dde session module
      ii dde-session-shell 6.0.65 amd64 deepin desktop-environment - dde-session-shell module
      ii dde-session-ui 6.0.47 amd64 deepin desktop-environment - dde-session-ui module
      ii dde-shell 2.0.52 amd64 An wrapper for developed based on dde-shell plugin system
      ii deepin-service-manager 1.0.22 amd64 deepin desktop-environment - service manager frame
      ii deepin-service-plugin-network 2.0.98 amd64 the plugin of network service for deepin-service-manager
      ii jnetapplet 2.1.0 amd64 网络速度监控 dde-shell 任务栏插件
      ii libdde-shell:amd64 2.0.52 amd64 DDE Shell library
      ii libdde-shell-dev 2.0.52 amd64 DDE Shell devel library
      ii libdde-shell-dock:amd64 2.0.52 amd64 DDE Shell dock library
      ii libglib2.0-0:amd64 2.84.4-3deepin3 amd64 GLib library of C routines
      ii libglib2.0-bin 2.84.4-3deepin3 amd64 Programs for the GLib library
      ii libglib2.0-data 2.84.4-3deepin3 all Common files for GLib library

    【问题现象】
    开机约 5 分钟后，service-manager:dde（PID 5994）内一个 QThread（PID 6054）
    持续 99.9% CPU，累计 CPU 时间几分钟不回落，导致整机发热、风扇狂转。
    重启桌面会话后恢复，但下次开机复现。系统内存充足（48G，仅用约 3G），
    非资源不足导致。

    【复现步骤】

    1. 正常开机进入桌面
    2. 等待 3~5 分钟
    3. 执行 top -H -p $(pgrep -f service-manager | head -1)
      观察某 QThread 持续 99.9% CPU

    【诊断证据】

    1. top -H：QThread(6054) R 状态 99.9%，TIME+ 3:55（开机仅5分钟）

    2. perf record 调用链显示：

      • 内核侧：ppoll → unix_poll + eventfd_poll 反复轮询
      • 用户态：QSocketNotifier::activated 反复触发，glib 主循环
        g_mutex_lock/unlock、g_source_ref、clock_gettime 高频执行
      • 即：一个 Qt 套接字通知器监听 UNIX socket，永远可读，循环不阻塞

    3. ss -xp 显示 service-manager 与 X Server（@/tmp/.X11-unix/X0）的
      多条连接存在未读数据积压，其中 fd 35 对应 socket RQ=17792 字节，
      其余 fd 32-37 也有 32~160 字节积压。

    4. strace 实锤空转线程（6054）ppoll([fd 15,32,35]) 每次都因 fd 35
      POLLIN 立即返回，0.87s 超时形同虚设 → busy loop。

    【根因分析（供官方参考）】
    service-manager 内某插件对 X11 连接注册了 QSocketNotifier，但对应
    X 事件数据未被消费，X Server 侧持续有数据积压（17792 字节 ≈ 500+
    个 X 事件），导致通知器风暴 + glib 主循环空转。疑似 dde-shell 或
    service-manager 插件层的 X11 事件处理 bug。

    下面是小U分析的结果

    QSocketNotifier 调用链（提取结果）

    plaintext

    12 └→ 0x79cf9b8d2768 (Qt6Core 内部)

    34

    而真正关键的是这几行——调用链里反复出现的插件符号：

    plaintext

    1libplugin-dde-shortcut.so [.] ModifierKeyMonitor::handleEvents() ← ★ 核心嫌疑人

    2libplugin-dde-shortcut.so [.] XRecordProcessReplies@plt ← ★ XRecord 处理

    3libXtst.so.6.1.0 [.] XRecordProcessReplies

    4libXtst.so.6.1.0 [.] XPending@plt

    5libX11.so.6.4.0 [.] XPending

    6libplugin-dde-shortcut.so [.] 0xc7ab8 / 0xc7aae / 0xc7a5a (插件内代码)

    7

    🔥 真凶确认：dde-shortcut 插件的 XRecord 监视

    完整机制：

    plaintext

    1libplugin-dde-shortcut.so（service-manager 的快捷键插件）

    2 └─ ModifierKeyMonitor 类

    3 └─ 通过 XRecord 扩展（libXtst）连接 X Server

    4 └─ 监听全部键盘/鼠标输入事件

    5 └─ X Server 持续灌事件流（fd 35 积压 17792 字节）

    6 └─ XPending 永远有数据 → QSocketNotifier 永远触发

    7 └─ glib 主循环 99.9% 空转

    8

    根因：ModifierKeyMonitor::handleEvents() 消费 XRecord 事件流的逻辑有 bug（或某个状态下没读干净），导致 XRecord 连接永远可读 → 通知器风暴。这也完美解释了为什么对端是 X Server（@/tmp/.X11-unix/X0）—— XRecord 连接本身就是连 X 的。

    📝 更新 bug 反馈：现在可以精确到模块了

    把这条加进反馈正文（这是官方最需要的定位信息）：

    plaintext

    1【真凶定位】

    2perf 调用链显示 CPU 消耗集中在：

    3 libplugin-dde-shortcut.so

    4 └─ ModifierKeyMonitor::handleEvents()

    5 └─ XRecordProcessReplies (libXtst XRecord 扩展)

    6现象：XRecord 连接（fd 35，对端 X Server @/tmp/.X11-unix/X0）

    7积压 17792 字节未消费，QSocketNotifier 风暴导致 glib 循环空转。

    8疑似 ModifierKeyMonitor 的 XRecord 事件消费逻辑存在 busy-loop bug。

    附上当时的sudo perf record -p 5994 -g -o /tmp/perf.data -- sleep 10的日志

    perf_report_full.txt

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    avatar
    𰻞𰻝面
    deepin
    2026-09-22 02:49
    #1

    为你点赞👍

    agree

    Reply View the author
    avatar
    pzm9012
    Moderator
    2026-09-22 08:53
    #2
    𰻞𰻝面：

    为你点赞👍

    agree

    你在点赞什么confused

    Reply View the author
    avatar
    𰻞𰻝面
    deepin
    2026-09-22 09:32
    #3
    pzm9012：

    你在点赞什么confused

    找到问题了

    Reply View the author
    avatar
    150******77
    deepin
    2026-09-22 10:22
    #4
    pzm9012：

    你在点赞什么confused

    上次没去深入去挖原因，麻烦反馈给开发老师，谢谢

    Reply View the author
    avatar
    昨夜的星辰
    deepin
    2026-09-22 10:30
    #5

    有没有安装第三方插件，楼主的这个问题重来没有遇到过，只见过吃内存的😂

    image.png

    Reply View the author
    avatar
    150******77
    deepin
    2026-09-22 10:48
    #6
    昨夜的星辰：

    有没有安装第三方插件，楼主的这个问题重来没有遇到过，只见过吃内存的😂

    image.png

    ii dde-file-manager-services-plugins 6.6.3 amd64 deepin desktop-environment - deepin-service-manager plugins module
    ii dde-session 2.0.30 amd64 dde session module
    ii dde-session-shell 6.0.65 amd64 deepin desktop-environment - dde-session-shell module
    ii dde-session-ui 6.0.47 amd64 deepin desktop-environment - dde-session-ui module
    ii dde-shell 2.0.52 amd64 An wrapper for developed based on dde-shell plugin system
    ii deepin-service-manager 1.0.22 amd64 deepin desktop-environment - service manager frame
    ii deepin-service-plugin-network 2.0.98 amd64 the plugin of network service for deepin-service-manager
    ii jnetapplet 2.1.0 amd64 网络速度监控 dde-shell 任务栏插件
    ii libdde-shell:amd64 2.0.52 amd64 DDE Shell library
    ii libdde-shell-dev 2.0.52 amd64 DDE Shell devel library
    ii libdde-shell-dock:amd64 2.0.52 amd64 DDE Shell dock library
    ii libglib2.0-0:amd64 2.84.4-3deepin3 amd64 GLib library of C routines
    ii libglib2.0-bin 2.84.4-3deepin3 amd64 Programs for the GLib library
    ii libglib2.0-data 2.84.4-3deepin3 all Common files for GLib library

    Reply View the author
    avatar
    150******77
    deepin
    2026-09-22 10:50
    #7
    150******77：

    ii dde-file-manager-services-plugins 6.6.3 amd64 deepin desktop-environment - deepin-service-manager plugins module
    ii dde-session 2.0.30 amd64 dde session module
    ii dde-session-shell 6.0.65 amd64 deepin desktop-environment - dde-session-shell module
    ii dde-session-ui 6.0.47 amd64 deepin desktop-environment - dde-session-ui module
    ii dde-shell 2.0.52 amd64 An wrapper for developed based on dde-shell plugin system
    ii deepin-service-manager 1.0.22 amd64 deepin desktop-environment - service manager frame
    ii deepin-service-plugin-network 2.0.98 amd64 the plugin of network service for deepin-service-manager
    ii jnetapplet 2.1.0 amd64 网络速度监控 dde-shell 任务栏插件
    ii libdde-shell:amd64 2.0.52 amd64 DDE Shell library
    ii libdde-shell-dev 2.0.52 amd64 DDE Shell devel library
    ii libdde-shell-dock:amd64 2.0.52 amd64 DDE Shell dock library
    ii libglib2.0-0:amd64 2.84.4-3deepin3 amd64 GLib library of C routines
    ii libglib2.0-bin 2.84.4-3deepin3 amd64 Programs for the GLib library
    ii libglib2.0-data 2.84.4-3deepin3 all Common files for GLib library

    还有显卡切换插件

    Reply View the author
    avatar
    昨夜的星辰
    deepin
    2026-09-22 10:53
    #8
    150******77：

    ii dde-file-manager-services-plugins 6.6.3 amd64 deepin desktop-environment - deepin-service-manager plugins module
    ii dde-session 2.0.30 amd64 dde session module
    ii dde-session-shell 6.0.65 amd64 deepin desktop-environment - dde-session-shell module
    ii dde-session-ui 6.0.47 amd64 deepin desktop-environment - dde-session-ui module
    ii dde-shell 2.0.52 amd64 An wrapper for developed based on dde-shell plugin system
    ii deepin-service-manager 1.0.22 amd64 deepin desktop-environment - service manager frame
    ii deepin-service-plugin-network 2.0.98 amd64 the plugin of network service for deepin-service-manager
    ii jnetapplet 2.1.0 amd64 网络速度监控 dde-shell 任务栏插件
    ii libdde-shell:amd64 2.0.52 amd64 DDE Shell library
    ii libdde-shell-dev 2.0.52 amd64 DDE Shell devel library
    ii libdde-shell-dock:amd64 2.0.52 amd64 DDE Shell dock library
    ii libglib2.0-0:amd64 2.84.4-3deepin3 amd64 GLib library of C routines
    ii libglib2.0-bin 2.84.4-3deepin3 amd64 Programs for the GLib library
    ii libglib2.0-data 2.84.4-3deepin3 all Common files for GLib library

    网络速度监控那个没用过，可以尝试一下去掉看看效果

    显卡切换插件我用过，没问题的

    Reply View the author
    avatar
    150******77
    deepin
    2026-09-24 10:23
    #9
    昨夜的星辰：

    网络速度监控那个没用过，可以尝试一下去掉看看效果

    显卡切换插件我用过，没问题的

    卸了，重启了，没用

    ii dde-file-manager-services-plugins 6.6.3 amd64 deepin desktop-environment - deepin-service-manager plugins module
    ii dde-session 2.0.30 amd64 dde session module
    ii dde-session-shell 6.0.65 amd64 deepin desktop-environment - dde-session-shell module
    ii dde-session-ui 6.0.47 amd64 deepin desktop-environment - dde-session-ui module
    ii dde-shell 2.0.52 amd64 An wrapper for developed based on dde-shell plugin system
    ii deepin-service-manager 1.0.22 amd64 deepin desktop-environment - service manager frame
    ii deepin-service-plugin-network 2.0.98 amd64 the plugin of network service for deepin-service-manager
    ii libdde-shell:amd64 2.0.52 amd64 DDE Shell library
    ii libdde-shell-dev 2.0.52 amd64 DDE Shell devel library
    ii libdde-shell-dock:amd64 2.0.52 amd64 DDE Shell dock library
    zxs@zxs-PC:~$ dpkg -l | grep -E "libqt6core|libglib2.0" | head -5
    ii libglib2.0-0:amd64 2.84.4-3deepin3 amd64 GLib library of C routines
    ii libglib2.0-bin 2.84.4-3deepin3 amd64 Programs for the GLib library
    ii libglib2.0-data 2.84.4-3deepin3 all Common files for GLib library

    Reply View the author
    avatar
    150******77
    deepin
    2026-09-24 10:27
    #10

    2perf 调用链显示 CPU 消耗集中在：

    3 libplugin-dde-shortcut.so

    4 └─ ModifierKeyMonitor::handleEvents()

    5 └─ XRecordProcessReplies (libXtst XRecord 扩展)

    6现象：XRecord 连接（fd 35，对端 X Server @/tmp/.X11-unix/X0）

    7积压 17792 字节未消费，QSocketNotifier 风暴导致 glib 循环空转。

    8疑似 ModifierKeyMonitor 的 XRecord 事件消费逻辑存在 busy-loop bug。这个是官方插件吧。

    Reply View the author
    avatar
    昨夜的星辰
    deepin
    2026-09-24 19:08
    #11
    150******77：

    卸了，重启了，没用

    ii dde-file-manager-services-plugins 6.6.3 amd64 deepin desktop-environment - deepin-service-manager plugins module
    ii dde-session 2.0.30 amd64 dde session module
    ii dde-session-shell 6.0.65 amd64 deepin desktop-environment - dde-session-shell module
    ii dde-session-ui 6.0.47 amd64 deepin desktop-environment - dde-session-ui module
    ii dde-shell 2.0.52 amd64 An wrapper for developed based on dde-shell plugin system
    ii deepin-service-manager 1.0.22 amd64 deepin desktop-environment - service manager frame
    ii deepin-service-plugin-network 2.0.98 amd64 the plugin of network service for deepin-service-manager
    ii libdde-shell:amd64 2.0.52 amd64 DDE Shell library
    ii libdde-shell-dev 2.0.52 amd64 DDE Shell devel library
    ii libdde-shell-dock:amd64 2.0.52 amd64 DDE Shell dock library
    zxs@zxs-PC:~$ dpkg -l | grep -E "libqt6core|libglib2.0" | head -5
    ii libglib2.0-0:amd64 2.84.4-3deepin3 amd64 GLib library of C routines
    ii libglib2.0-bin 2.84.4-3deepin3 amd64 Programs for the GLib library
    ii libglib2.0-data 2.84.4-3deepin3 all Common files for GLib library

    命令输出略有不同

    ~$ dpkg -l | grep -E "libqt6core|libglib2.0" | head -5
ii  libglib2.0-0:amd64    2.84.4-3deepin3     amd64        GLib library of C routines
ii  libglib2.0-bin        2.84.4-3deepin3     amd64        Programs for the GLib library
ii  libglib2.0-data       2.84.4-3deepin3     all          Common files for GLib library
ii  libqt6core5compat6:amd64   6.8.0-0deepin1  amd64        Qt 6 Qt5Compat library
ii  libqt6core6:amd64          6.8.0+dfsg-0deepin31     amd64        Qt 6 core module
    Reply View the author