Ashfaqur Rahaman提出的问题 -unix

Ashfaqur Rahaman

Asked: 2022-03-24 17:04:22 +0800 CST

snap 包失败：/user.slice/user-1000.slice/session-1.scope 不是 snap cgroup

4

突然，快照包无法在我的系统中运行，并出现以下错误：

/user.slice/user-1000.slice/session-1.scope 不是 snap cgroup

操作系统：Debian 11

内核：5.10.0-12-amd64

$ SNAPD_DEBUG=1 snap run slack

2022/03/23 18:48:37.614818 tool_linux.go:204: DEBUG: restarting into "/snap/snapd/current/usr/bin/snap"
2022/03/23 18:48:37.625495 cmd_run.go:1026: DEBUG: executing snap-confine from /snap/snapd/15177/usr/lib/snapd/snap-confine
2022/03/23 18:48:37.625874 cmd_run.go:433: DEBUG: SELinux not enabled
2022/03/23 18:48:37.626049 tracking.go:46: DEBUG: creating transient scope snap.slack.slack
2022/03/23 18:48:37.626597 tracking.go:186: DEBUG: using session bus
2022/03/23 18:48:37.627860 tracking.go:294: DEBUG: StartTransientUnit failed with "org.freedesktop.DBus.Error.Spawn.ChildExited": [Process org.freedesktop.systemd1 exited with status 1]
2022/03/23 18:48:37.627986 cmd_run.go:1198: DEBUG: snapd cannot track the started application
2022/03/23 18:48:37.627996 cmd_run.go:1199: DEBUG: snap refreshes will not be postponed by this process
DEBUG: umask reset, old umask was  022
DEBUG: security tag: snap.slack.slack
DEBUG: executable:   /usr/lib/snapd/snap-exec
DEBUG: confinement:  non-classic
DEBUG: base snap:    core18
DEBUG: ruid: 1000, euid: 0, suid: 0
DEBUG: rgid: 1000, egid: 1000, sgid: 1000
DEBUG: apparmor label on snap-confine is: /snap/snapd/15177/usr/lib/snapd/snap-confine
DEBUG: apparmor mode is: enforce
DEBUG: creating lock directory /run/snapd/lock (if missing)
DEBUG: set_effective_identity uid:0 (change: no), gid:0 (change: yes)
DEBUG: opening lock directory /run/snapd/lock
DEBUG: set_effective_identity uid:0 (change: no), gid:1000 (change: yes)
DEBUG: opening lock file: /run/snapd/lock/.lock
DEBUG: set_effective_identity uid:0 (change: no), gid:0 (change: yes)
DEBUG: set_effective_identity uid:0 (change: no), gid:1000 (change: yes)
DEBUG: sanity timeout initialized and set for 30 seconds
DEBUG: acquiring exclusive lock (scope (global), uid 0)
DEBUG: sanity timeout reset and disabled
DEBUG: ensuring that snap mount directory is shared
DEBUG: unsharing snap namespace directory
DEBUG: set_effective_identity uid:0 (change: no), gid:0 (change: yes)
DEBUG: set_effective_identity uid:0 (change: no), gid:1000 (change: yes)
DEBUG: releasing lock 5
DEBUG: opened snap-update-ns executable as file descriptor 5
DEBUG: opened snap-discard-ns executable as file descriptor 6
DEBUG: creating lock directory /run/snapd/lock (if missing)
DEBUG: set_effective_identity uid:0 (change: no), gid:0 (change: yes)
DEBUG: opening lock directory /run/snapd/lock
DEBUG: set_effective_identity uid:0 (change: no), gid:1000 (change: yes)
DEBUG: opening lock file: /run/snapd/lock/slack.lock
DEBUG: set_effective_identity uid:0 (change: no), gid:0 (change: yes)
DEBUG: set_effective_identity uid:0 (change: no), gid:1000 (change: yes)
DEBUG: sanity timeout initialized and set for 30 seconds
DEBUG: acquiring exclusive lock (scope slack, uid 0)
DEBUG: sanity timeout reset and disabled
DEBUG: initializing mount namespace: slack
DEBUG: setting up device cgroup
DEBUG: libudev has current tags support
DEBUG: device /sys/devices/pci0000:00/0000:00:02.0/drm/card0 has matching current tag
DEBUG: set_effective_identity uid:0 (change: no), gid:0 (change: yes)
DEBUG: get bpf object at path /sys/fs/bpf/snap/snap_slack_slack
DEBUG: set_effective_identity uid:0 (change: no), gid:1000 (change: yes)
DEBUG: found existing device map
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: get next key for map 8
DEBUG: found 20 existing entries in devices map
DEBUG: delete key for c 143:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 1:8
DEBUG: delete elem in map 8
DEBUG: delete key for c 10:239
DEBUG: delete elem in map 8
DEBUG: delete key for c 1:7
DEBUG: delete elem in map 8
DEBUG: delete key for c 138:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 142:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 137:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 141:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 5:0
DEBUG: delete elem in map 8
DEBUG: delete key for c 226:0
DEBUG: delete elem in map 8
DEBUG: delete key for c 140:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 1:9
DEBUG: delete elem in map 8
DEBUG: delete key for c 139:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 5:2
DEBUG: delete elem in map 8
DEBUG: delete key for c 1:5
DEBUG: delete elem in map 8
DEBUG: delete key for c 1:3
DEBUG: delete elem in map 8
DEBUG: delete key for c 226:128
DEBUG: delete elem in map 8
DEBUG: delete key for c 136:-1
DEBUG: delete elem in map 8
DEBUG: delete key for c 5:1
DEBUG: delete elem in map 8
DEBUG: delete key for c 10:200
DEBUG: delete elem in map 8
DEBUG: set_effective_identity uid:0 (change: no), gid:0 (change: yes)
DEBUG: load program of type 0xf, 33 instructions
DEBUG: set_effective_identity uid:0 (change: no), gid:1000 (change: yes)
DEBUG: v2 allow c 1:3
DEBUG: v2 allow c 1:5
DEBUG: v2 allow c 1:7
DEBUG: v2 allow c 1:8
DEBUG: v2 allow c 1:9
DEBUG: v2 allow c 5:0
DEBUG: v2 allow c 5:1
DEBUG: v2 allow c 5:2
DEBUG: v2 allow c 136:4294967295
DEBUG: v2 allow c 137:4294967295
DEBUG: v2 allow c 138:4294967295
DEBUG: v2 allow c 139:4294967295
DEBUG: v2 allow c 140:4294967295
DEBUG: v2 allow c 141:4294967295
DEBUG: v2 allow c 142:4294967295
DEBUG: v2 allow c 143:4294967295
DEBUG: v2 allow c 10:239
DEBUG: v2 allow c 10:200
DEBUG: inspecting type of device: /dev/dri/card0
DEBUG: v2 allow c 226:0
DEBUG: device /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1 has matching current tag
DEBUG: cannot get major/minor numbers for syspath /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1
DEBUG: device /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1 has matching current tag
DEBUG: cannot get major/minor numbers for syspath /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1
DEBUG: device /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2 has matching current tag
DEBUG: cannot get major/minor numbers for syspath /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2
DEBUG: device /sys/devices/pci0000:00/0000:00:02.0/drm/renderD128 has matching current tag
DEBUG: inspecting type of device: /dev/dri/renderD128
DEBUG: v2 allow c 226:128
DEBUG: process in cgroup /user.slice/user-1000.slice/session-1.scope
/user.slice/user-1000.slice/session-1.scope is not a snap cgroup

从 snapd 日志中，我认为根本问题是：

2022/03/23 18:48:37.627860 tracking.go:294：调试：StartTransientUnit 因“org.freedesktop.DBus.Error.Spawn.ChildExited”失败：[进程 org.freedesktop.systemd1 以状态 1 退出]

我可以采取哪些步骤来解决此问题？一些附加信息：

$ snap --version

snap    2.54.4
snapd   2.54.4
series  16
debian  11
kernel  5.10.0-12-amd64

$ systemctl --version

systemd 247 (247.3-6)
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +ZSTD +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=unified

$ sudo systemct status dbus.service

 dbus.service - D-Bus System Message Bus
     Loaded: loaded (/lib/systemd/system/dbus.service; static)
     Active: active (running) since Wed 2022-03-23 18:17:36 MDT; 34min ago
TriggeredBy: ● dbus.socket
       Docs: man:dbus-daemon(1)
   Main PID: 551 (dbus-daemon)
      Tasks: 1 (limit: 18764)
     Memory: 2.3M
        CPU: 1.785s
     CGroup: /system.slice/dbus.service
             └─551 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only

Mar 23 18:17:36 sboban-desktop systemd[1]: Started D-Bus System Message Bus.
Mar 23 18:17:37 sboban-desktop dbus-daemon[551]: [system] Activating via systemd: service name='org.freedesktop.timedate1' unit='dbus-org.freedesktop.timedate1.service' requested by ':1.11' >
Mar 23 18:17:37 sboban-desktop dbus-daemon[551]: [system] Successfully activated service 'org.freedesktop.timedate1'
Mar 23 18:17:44 sboban-desktop dbus-daemon[551]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.16' (uid=1000 pid=8>
Mar 23 18:17:44 sboban-desktop dbus-daemon[551]: [system] Successfully activated service 'org.freedesktop.RealtimeKit1'
Mar 23 18:18:10 sboban-desktop dbus-daemon[551]: [system] Activating via systemd: service name='org.freedesktop.timedate1' unit='dbus-org.freedesktop.timedate1.service' requested by ':1.11' >
Mar 23 18:18:10 sboban-desktop dbus-daemon[551]: [system] Successfully activated service 'org.freedesktop.timedate1'
Mar 23 18:18:18 sboban-desktop dbus-daemon[551]: [system] Activating via systemd: service name='org.freedesktop.UPower' unit='upower.service' requested by ':1.36' (uid=1000 pid=1192 comm="/u>
Mar 23 18:18:18 sboban-desktop dbus-daemon[551]: [system] Successfully activated service 'org.freedesktop.UPower'

$ systemctl --user dbus.service

dbus.service - D-Bus User Message Bus
     Loaded: loaded (/usr/lib/systemd/user/dbus.service; static)
     Active: active (running) since Wed 2022-03-23 18:17:44 MDT; 36min ago
TriggeredBy: ● dbus.socket
       Docs: man:dbus-daemon(1)
   Main PID: 877 (dbus-daemon)
      Tasks: 1 (limit: 18764)
     Memory: 1.1M
        CPU: 5ms
     CGroup: /user.slice/user-1000.slice/[email protected]/app.slice/dbus.service
             └─877 /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only

Mar 23 18:17:44 sboban-desktop systemd[846]: Started D-Bus User Message Bus.

$ sudo systemctl status user@$(id -u)

 [email protected] - User Manager for UID 1000
     Loaded: loaded (/lib/systemd/system/[email protected]; static)
     Active: active (running) since Wed 2022-03-23 18:17:44 MDT; 37min ago
       Docs: man:[email protected](5)
   Main PID: 846 (systemd)
     Status: "Startup finished in 774ms."
      Tasks: 9
     Memory: 41.1M
        CPU: 484ms
     CGroup: /user.slice/user-1000.slice/[email protected]
             ├─app.slice
             │ ├─dbus.service
             │ │ └─877 /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
             │ ├─pipewire.service
             │ │ ├─866 /usr/bin/pipewire
             │ │ └─878 /usr/bin/pipewire-media-session
             │ └─pulseaudio.service
             │   └─867 /usr/bin/pulseaudio --daemonize=no --log-target=journal
             └─init.scope
               ├─846 /lib/systemd/systemd --user
               └─847 (sd-pam)

Mar 23 18:17:44 sboban-desktop systemd[846]: Reached target Sockets.
Mar 23 18:17:44 sboban-desktop systemd[846]: Reached target Basic System.
Mar 23 18:17:44 sboban-desktop systemd[1]: Started User Manager for UID 1000.
Mar 23 18:17:44 sboban-desktop systemd[846]: Started Multimedia Service.
Mar 23 18:17:44 sboban-desktop systemd[846]: Starting Sound Service...
Mar 23 18:17:44 sboban-desktop systemd[846]: Started D-Bus User Message Bus.
Mar 23 18:17:44 sboban-desktop pipewire[866]: Failed to receive portal pid: org.freedesktop.DBus.Error.NameHasNoOwner: Could not get PID of name 'org.freedesktop.portal.Desktop': no such name
Mar 23 18:17:45 sboban-desktop systemd[846]: Started Sound Service.
Mar 23 18:17:45 sboban-desktop systemd[846]: Reached target Main User Target.
Mar 23 18:17:45 sboban-desktop systemd[846]: Startup finished in 774ms.

如果您需要更多信息，请告诉我。任何形式的帮助将不胜感激。谢谢你。

Ashfaqur Rahaman

Asked: 2020-02-04 09:57:29 +0800 CST

针对定制的 GLIBC 编译 GCC

1

我试图针对定制的 GLIBC 2.30 编译 GCC 9.2。我在非标准位置安装了 GLIBC。然后我按照以下步骤编译 GCC：

sfinix@multivac:~$ GLIBCDIR=/home/sfinix/programming/repos/glibc/glibc-install/
sfinix@multivac:~$ export LDFLAGS="-Wl,-q"
sfinix@multivac:~$ CFLAGS="-L "${GLIBCDIR}/lib" -I "${GLIBCDIR}/include" -Wl,--rpath="${GLIBCDIR}/lib" -Wl,--dynamic-linker="${GLIBCDIR}/lib/ld-linux-x86-64.so.2""
sfinix@multivac:~$ cd ${GCC_BUILD_DIR}
sfinix@multivac:~$ make -j 4 CFLAGS="${CFLAGS}" CXXFLAGS="${CFLAGS}"

编译成功，但问题是 GCC 仍在拾取旧库：

sfinix@multivac:~$ ldd programming/repos/gcc/gcc-install/bin/gcc-9.2
        linux-vdso.so.1 (0x00007ffc3b7cb000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f177772f000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f177733e000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f1777acd000)

输出readelf -d programming/repos/gcc/gcc-install/bin/gcc-9.2：

Dynamic section at offset 0x113dd8 contains 27 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [ld-linux-x86-64.so.2]
 0x000000000000000c (INIT)               0x402a80
 0x000000000000000d (FINI)               0x488440
 0x0000000000000019 (INIT_ARRAY)         0x712de8
 0x000000000000001b (INIT_ARRAYSZ)       48 (bytes)
 0x000000000000001a (FINI_ARRAY)         0x712e18
 0x000000000000001c (FINI_ARRAYSZ)       8 (bytes)
 0x0000000000000004 (HASH)               0x4002b0
 0x000000006ffffef5 (GNU_HASH)           0x400728
 0x0000000000000005 (STRTAB)             0x4015f0
 0x0000000000000006 (SYMTAB)             0x400798
 0x000000000000000a (STRSZ)              1373 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000003 (PLTGOT)             0x714000
 0x0000000000000002 (PLTRELSZ)           3264 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x401dc0
 0x0000000000000007 (RELA)               0x401d00
 0x0000000000000008 (RELASZ)             192 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffe (VERNEED)            0x401c80
 0x000000006fffffff (VERNEEDNUM)         2
 0x000000006ffffff0 (VERSYM)             0x401b4e
 0x0000000000000000 (NULL)               0x0

虽然这种方法适用于其他程序，但我正在编译自己进行测试：

sfinix@multivac:~$ GLIBDIR=/home/sfinix/programming/repos/glibc/glibc-install/
sfinix@multivac:~$ vim test.c
sfinix@multivac:~$ CFLAGS="-L ${GLIBDIR}/lib -I ${GLIBDIR}/include -Wl,--rpath=${GLIBDIR}/lib -Wl,--dynamic-linker=${GLIBDIR}/lib/ld-linux-x86-64.so.2"
sfinix@multivac:~$ gcc -Wall -g ${CFLAGS} test.c -o run
sfinix@multivac:~$ ldd run
        linux-vdso.so.1 (0x00007ffd616d5000)
        libc.so.6 => /home/sfinix/programming/repos/glibc/glibc-install//lib/libc.so.6 (0x00007f5fcdc6e000)
        /home/sfinix/programming/repos/glibc/glibc-install//lib/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 (0x00007f5fce22a000)

我错过了什么？如何针对自定义 GLIBC 编译 GCC？如何传递编译器和链接器标志？

Ashfaqur Rahaman

Asked: 2019-05-22 01:25:16 +0800 CST

无法在前台进程组中添加子进程

1

我正在尝试在前台进程组中添加一个子进程。分叉后，我正在调用execve()生成一个新进程（在本例中为 unix echo 程序）。在调用之前，execve()我正在使用孩子的 pid 创建一个新的进程组。因此，孩子正在成为该流程组的流程领导者。之后我打电话tcsetpgrp()在前台进程组中添加进程组。

当我运行程序时，它会挂在tcsetpgrp()调用中。execve()从不执行。如果我删除tcsetpgrp()呼叫，则execve()成功执行。

无法理解为什么会这样。以下是我写的代码：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

void pr_ids(char *name){
    pid_t pid, ppid, pgid, tpgid;

    pid = getpid();
    ppid = getppid();
    pgid = getpgrp(); 
    tpgid = tcgetpgrp(STDIN_FILENO);

    printf("%s: pid = %d ppid = %d"
           " pgid = %d tpgid = %d\n", name, pid, ppid, pgid, tpgid);
}

int main(int argc, char *argv[]){
    pid_t pid;
    int st;
    char *args[] = {"/bin/echo", "hello", NULL};

    pr_ids("parent"); 

    if((pid = fork()) == 0){
        setpgid(0, 0);  // creates its own process group and becomes group leader
        pr_ids("child");
        pid_t cpgrp = getpgrp();
        tcsetpgrp(STDIN_FILENO, cpgrp);     // add the process group to foreground
        pr_ids("child");
        execve(args[0], args, NULL); 
    }
    else if(pid > 0){
        waitpid(pid, &st, 0); 
    }

    exit(0);
}

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