linux - 在 Debug模式下加载 libglib 时 "error: symbol lookup error: undefined symbol:"有什么意义？

Question

以下命令成功且没有错误:python3 -c 'from gi.repository import GLib'。

但是，在调试一些与 glib 相关的段错误时，我使用 LD_DEBUG=files 运行相同的命令(在多个版本的 Debian 和 Ubuntu 上)并得到一堆与 libglib 和 libgobject 相关的错误.

这些是直接来自存储库的未修改库(有关详细信息，请参阅下面的“环境”)。

问题:这些错误的意义是什么？可以安全地忽略它们吗？如果可以，为什么？或者它们是否会在以后的程序中导致错误，如果是这样，是否有解决此问题的解决方法，或者这些包是否只是损坏并且必须通过修改源代码来修复？

错误示例:

 16306: opening file=/lib/x86_64-linux-gnu/libglib-2.0.so.0 [0]; direct_opencount=1
 16306:
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_module_check_init (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_module_unload (fatal)

环境

• 在具有 4 个不同发行版的 5 台不同计算机上进行了测试:Ubuntu 14.04、Ubuntu 15.10、Debian 8.4 和某人的自定义发行版
• 相关软件包版本(仅适用于 15.10 Ubuntu 发行版):
  • python3 3.4.3-4ubuntu1(也:python3-all python3-all-dev python3-dbg python3-dev)
  • python3-gi 3.16.2-1build1(又名:python3-gi-cairo python3-gi-dbg)
  • gir1.2-glib-2.0:amd64 1.44.0-1
  • libgirepository-1.0-1:amd64 1.44.0-1
  • libglib2.0-0:am​​d64 2.46.2-1ubuntu2

完整命令输出:

$ LD_DEBUG=files python3 -c 'from gi.repository import GLib'
 16306: 
 16306: file=libpthread.so.0 [0];  needed by python3 [0]
 16306: file=libpthread.so.0 [0];  generating link map
 16306:   dynamic: 0x00007f74ce030d50  base: 0x00007f74cde19000   size: 0x000000000021c490
 16306:     entry: 0x00007f74cde1ff10  phdr: 0x00007f74cde19040  phnum:                  9
 16306: 
 16306: 
 16306: file=libdl.so.2 [0];  needed by python3 [0]
 16306: file=libdl.so.2 [0];  generating link map
 16306:   dynamic: 0x00007f74cde17d88  base: 0x00007f74cdc15000   size: 0x0000000000203110
 16306:     entry: 0x00007f74cdc15ed0  phdr: 0x00007f74cdc15040  phnum:                  9
 16306: 
 16306: 
 16306: file=libutil.so.1 [0];  needed by python3 [0]
 16306: file=libutil.so.1 [0];  generating link map
 16306:   dynamic: 0x00007f74cdc13dc0  base: 0x00007f74cda12000   size: 0x0000000000202118
 16306:     entry: 0x00007f74cda12f10  phdr: 0x00007f74cda12040  phnum:                  9
 16306: 
 16306: 
 16306: file=librt.so.1 [0];  needed by python3 [0]
 16306: file=librt.so.1 [0];  generating link map
 16306:   dynamic: 0x00007f74cda10d70  base: 0x00007f74cd80a000   size: 0x0000000000207c18
 16306:     entry: 0x00007f74cd80c350  phdr: 0x00007f74cd80a040  phnum:                  9
 16306: 
 16306: 
 16306: file=libexpat.so.1 [0];  needed by python3 [0]
 16306: file=libexpat.so.1 [0];  generating link map
 16306:   dynamic: 0x00007f74cd808dc0  base: 0x00007f74cd5e1000   size: 0x0000000000228088
 16306:     entry: 0x00007f74cd5e4b90  phdr: 0x00007f74cd5e1040  phnum:                  7
 16306: 
 16306: 
 16306: file=libz.so.1 [0];  needed by python3 [0]
 16306: file=libz.so.1 [0];  generating link map
 16306:   dynamic: 0x00007f74cd5dfdd0  base: 0x00007f74cd3c6000   size: 0x000000000021a228
 16306:     entry: 0x00007f74cd3c8220  phdr: 0x00007f74cd3c6040  phnum:                  7
 16306: 
 16306: 
 16306: file=libm.so.6 [0];  needed by python3 [0]
 16306: file=libm.so.6 [0];  generating link map
 16306:   dynamic: 0x00007f74cd3c4da8  base: 0x00007f74cd0c5000   size: 0x0000000000300158
 16306:     entry: 0x00007f74cd0ca580  phdr: 0x00007f74cd0c5040  phnum:                  9
 16306: 
 16306: 
 16306: file=libc.so.6 [0];  needed by python3 [0]
 16306: file=libc.so.6 [0];  generating link map
 16306:   dynamic: 0x00007f74cd0beba0  base: 0x00007f74ccd1a000   size: 0x00000000003aaa20
 16306:     entry: 0x00007f74ccd3bc50  phdr: 0x00007f74ccd1a040  phnum:                 10
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libpthread.so.0
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libc.so.6
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libm.so.6
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libz.so.1
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libexpat.so.1
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/librt.so.1
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libutil.so.1
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libdl.so.2
 16306: 
 16306: 
 16306: initialize program: python3
 16306: 
 16306: 
 16306: transferring control: python3
 16306: 
 16306: 
 16306: file=/usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0];  dynamically loaded by python3 [0]
 16306: file=/usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0];  generating link map
 16306:   dynamic: 0x00007f74ccb1f9e8  base: 0x00007f74cc8da000   size: 0x000000000024e648
 16306:     entry: 0x00007f74cc8ea4f0  phdr: 0x00007f74cc8da040  phnum:                  7
 16306: 
 16306: 
 16306: file=libgthread-2.0.so.0 [0];  needed by /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0]
 16306: file=libgthread-2.0.so.0 [0];  generating link map
 16306:   dynamic: 0x00007f74cc8d8de8  base: 0x00007f74cc6d8000   size: 0x0000000000201048
 16306:     entry: 0x00007f74cc6d86d0  phdr: 0x00007f74cc6d8040  phnum:                  7
 16306: 
 16306: 
 16306: file=libgirepository-1.0.so.1 [0];  needed by /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0]
 16306: file=libgirepository-1.0.so.1 [0];  generating link map
 16306:   dynamic: 0x00007f74cc6d6ce0  base: 0x00007f74cc4a5000   size: 0x0000000000232688
 16306:     entry: 0x00007f74cc4ac380  phdr: 0x00007f74cc4a5040  phnum:                  7
 16306: 
 16306: 
 16306: file=libgobject-2.0.so.0 [0];  needed by /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0]
 16306: file=libgobject-2.0.so.0 [0];  generating link map
 16306:   dynamic: 0x00007f74cc4a3b80  base: 0x00007f74cc252000   size: 0x0000000000252fc8
 16306:     entry: 0x00007f74cc25d330  phdr: 0x00007f74cc252040  phnum:                  7
 16306: 
 16306: 
 16306: file=libglib-2.0.so.0 [0];  needed by /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0]
 16306: file=libglib-2.0.so.0 [0];  generating link map
 16306:   dynamic: 0x00007f74cc24fd40  base: 0x00007f74cbf43000   size: 0x000000000030e6a8
 16306:     entry: 0x00007f74cbf5d580  phdr: 0x00007f74cbf43040  phnum:                  7
 16306: 
 16306: 
 16306: file=libffi.so.6 [0];  needed by /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0]
 16306: file=libffi.so.6 [0];  generating link map
 16306:   dynamic: 0x00007f74cbf41de8  base: 0x00007f74cbd3b000   size: 0x0000000000207668
 16306:     entry: 0x00007f74cbd3c870  phdr: 0x00007f74cbd3b040  phnum:                  7
 16306: 
 16306: 
 16306: file=libgmodule-2.0.so.0 [0];  needed by /usr/lib/x86_64-linux-gnu/libgirepository-1.0.so.1 [0]
 16306: file=libgmodule-2.0.so.0 [0];  generating link map
 16306:   dynamic: 0x00007f74cbd39de8  base: 0x00007f74cbb37000   size: 0x00000000002031b8
 16306:     entry: 0x00007f74cbb381b0  phdr: 0x00007f74cbb37040  phnum:                  7
 16306: 
 16306: 
 16306: file=libgio-2.0.so.0 [0];  needed by /usr/lib/x86_64-linux-gnu/libgirepository-1.0.so.1 [0]
 16306: file=libgio-2.0.so.0 [0];  generating link map
 16306:   dynamic: 0x00007f74cbb32c68  base: 0x00007f74cb7bd000   size: 0x0000000000379ac8
 16306:     entry: 0x00007f74cb7f0c50  phdr: 0x00007f74cb7bd040  phnum:                  7
 16306: 
 16306: 
 16306: file=libpcre.so.3 [0];  needed by /lib/x86_64-linux-gnu/libglib-2.0.so.0 [0]
 16306: file=libpcre.so.3 [0];  generating link map
 16306:   dynamic: 0x00007f74cb7bbc90  base: 0x00007f74cb54f000   size: 0x000000000026d168
 16306:     entry: 0x00007f74cb550710  phdr: 0x00007f74cb54f040  phnum:                  7
 16306: 
 16306: 
 16306: file=libselinux.so.1 [0];  needed by /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 [0]
 16306: file=libselinux.so.1 [0];  generating link map
 16306:   dynamic: 0x00007f74cb54bd68  base: 0x00007f74cb32a000   size: 0x00000000002248f0
 16306:     entry: 0x00007f74cb330310  phdr: 0x00007f74cb32a040  phnum:                  8
 16306: 
 16306: 
 16306: file=libresolv.so.2 [0];  needed by /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 [0]
 16306: file=libresolv.so.2 [0];  generating link map
 16306:   dynamic: 0x00007f74cb326d88  base: 0x00007f74cb113000   size: 0x0000000000216a68
 16306:     entry: 0x00007f74cb116a90  phdr: 0x00007f74cb113040  phnum:                  9
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libresolv.so.2
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libpcre.so.3
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libselinux.so.1
 16306: 
 16306: 
 16306: calling init: /lib/x86_64-linux-gnu/libglib-2.0.so.0
 16306: 
 16306: 
 16306: calling init: /usr/lib/x86_64-linux-gnu/libffi.so.6
 16306: 
 16306: 
 16306: calling init: /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 16306: 
 16306: 
 16306: calling init: /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0
 16306: 
 16306: 
 16306: calling init: /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 16306: 
 16306: 
 16306: calling init: /usr/lib/x86_64-linux-gnu/libgirepository-1.0.so.1
 16306: 
 16306: 
 16306: calling init: /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0
 16306: 
 16306: 
 16306: calling init: /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so
 16306: 
 16306: opening file=/usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0]; direct_opencount=1
 16306: 
 16306: 
 16306: file=/usr/lib/python3.4/lib-dynload/_opcode.cpython-34m-x86_64-linux-gnu.so [0];  dynamically loaded by python3 [0]
 16306: file=/usr/lib/python3.4/lib-dynload/_opcode.cpython-34m-x86_64-linux-gnu.so [0];  generating link map
 16306:   dynamic: 0x00007f74caff0df8  base: 0x00007f74cadf0000   size: 0x00000000002011f0
 16306:     entry: 0x00007f74cadf0990  phdr: 0x00007f74cadf0040  phnum:                  7
 16306: 
 16306: 
 16306: calling init: /usr/lib/python3.4/lib-dynload/_opcode.cpython-34m-x86_64-linux-gnu.so
 16306: 
 16306: opening file=/usr/lib/python3.4/lib-dynload/_opcode.cpython-34m-x86_64-linux-gnu.so [0]; direct_opencount=1
 16306: 
 16306: opening file=/lib/x86_64-linux-gnu/libglib-2.0.so.0 [0]; direct_opencount=1
 16306: 
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_module_check_init (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_module_unload (fatal)
 16306: opening file=/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 [0]; direct_opencount=1
 16306: 
 16306: /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0: error: symbol lookup error: undefined symbol: g_module_check_init (fatal)
 16306: /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0: error: symbol lookup error: undefined symbol: g_module_unload (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_io_condition_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_loop_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_loop_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_loop_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_loop_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_context_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_context_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_context_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_main_context_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_source_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_source_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_source_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_source_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_source_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_source_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_io_channel_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_io_channel_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_io_channel_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_io_channel_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_pollfd_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_pollfd_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_pollfd_get_type (fatal)
 16306: /lib/x86_64-linux-gnu/libglib-2.0.so.0: error: symbol lookup error: undefined symbol: g_pollfd_get_type (fatal)
 16306: 
 16306: calling fini: python3 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libutil.so.1 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/librt.so.1 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libexpat.so.1 [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-x86_64-linux-gnu.so [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/x86_64-linux-gnu/libgirepository-1.0.so.1 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libm.so.6 [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0 [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/x86_64-linux-gnu/libffi.so.6 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libglib-2.0.so.0 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libz.so.1 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libselinux.so.1 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libpcre.so.3 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libdl.so.2 [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libresolv.so.2 [0]
 16306: 
 16306: 
 16306: calling fini: /usr/lib/python3.4/lib-dynload/_opcode.cpython-34m-x86_64-linux-gnu.so [0]
 16306: 
 16306: 
 16306: calling fini: /lib/x86_64-linux-gnu/libpthread.so.0 [0]
 16306: 

Answer 1

我在使用 GLib 和 GStreamer 的 Python 应用程序中看到了同样的情况。我使用 LD_FILES=true 运行它并通过管道输出:

$ ./testlib.sh lib/hls.py 2>&1 | grep fatal |awk '{ print $(NF-1) }' | sort -u
__driDriverGetExtensions_swrast
g_io_channel_get_type
g_io_condition_get_type
g_main_context_get_type
g_main_loop_get_type
g_module_check_init
g_module_unload
g_pollfd_get_type
g_source_get_type

__driDriverGetExtensions_swrast() 似乎有点特别，但其他的都可以在Gnome Developer Boxed Types 上找到页或 Dyanmic Loading of Modules .

我仍然不确定这是否是我现在每次运行我的应用程序都会出现段错误的原因。 GModuleCheckInit() 的部分说:

If a module contains a function named g_module_check_init() it is called automatically when the module is loaded.

所以可能g_module_check_init()没有找到是正常的，相关报错信息无害。我想知道这是否是模块加载继续进行而不是立即退出并显示一些错误代码的原因。

在此期间，我自己构建并安装了所有 GStreamer 库和命令行工具，以获得最新的稳定版本 (GStreamer 1.10.4)。但是当它开始出现段错误时，我清除了/usr 下我能找到的所有 gstreamer 库，并安装了我的 Ubuntu 发行版 GStreamer 1.2 附带的版本。它仍然存在段错误，因此可能仍然缺少某些内容。

我知道这只是部分答案，但评论太长了。也许有人可以添加一些东西。