GDB核心轉儲：通過build-id查找可執行文件

Question

有可能讓gdb自動找到相應的可執行文件嗎？ 我已經解壓縮了調試符號並將它們放在/usr/lib/debug/.build-id/目錄中。 當我用gdb /usr/bin/executable core啟動gdb時，一切正常。 可執行文件和所有共享庫的所有調試符號都會自動加載，因為gdb知道build-id並自動加載它。

$ gdb /usr/bin/executable core
GNU gdb (GDB) 7.0.1-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/executable...Reading symbols from /usr/lib/debug/.build-id/b7/fada8ba917de74a6055647f3ac205dee1615c8.debug...done.

但是，當我剛啟動gdb並加載核心文件時，不會加載任何調試符號。

(gdb) core-file core
[New Thread 10822]
[New Thread 10812]
Core was generated by `/usr/bin/executable'.
Program terminated with signal 6, Aborted.
#0  0xb7790424 in __kernel_vsyscall ()

使用strace運行gdb表明它甚至沒有嘗試找到它們。 核心文件包含build-id，所以我猜gdb應該能夠找到它...

$ eu-unstrip -n --core core
0x8048000+0x25d000 b7fada8ba917de74a6055647f3ac205dee1615c8@0x8048178 - - [exe]
0xb7790000+0x1000 da7bd9bbfe599f7e9b644d684db983c4b34d8f31@0xb77901ec . - linux-gate.so.1
0xb7771000+0x19000 242ae1f2965ed161f3715858d7792019963b57fd@0xb7771164 /lib/i686/cmov/libpthread.so.0 - libpthread.so.0
0xb7768000+0x9000 06a49519b1ede0f79596e4b0cd07d2beba43b2dc@0xb7768164 /lib/i686/cmov/librt.so.1 - librt.so.1
0xb7672000+0xf5000 9daf5aac9ccc9281f2805639c3f87731beae5548@0xb7672144 /usr/lib/libstdc++.so.6 - libstdc++.so.6
0xb764c000+0x26000 696d5fb148fe51609203903d470a8f85d458cd17@0xb764c164 /lib/i686/cmov/libm.so.6 - libm.so.6
0xb762e000+0x1e000 d2a7edbd5dafabb7bb90198eeb58013342c589f0@0xb762e104 /lib/libgcc_s.so.1 - libgcc_s.so.1
0xb74e7000+0x147000 2124040143ac9f7478cc16b474b1cfdfe2c45353@0xb74e7184 /lib/i686/cmov/libc.so.6 - libc.so.6
0xb7791000+0x1d000 5a6fc3cf12f68887cbf22da3a9785d00f7d91c41@0xb7791124 /lib/ld-linux.so.2 - ld-linux.so.2

有沒有辦法讓gdb查找可執行文件的調試文件而不提供導致核心轉儲的可執行文件？

Answer 1

您可以嘗試直接加載調試符號：

(gdb) symbol-file /tmp/your_debug_symbols.dbg

但我不認為coredump本身對GDB來說已經足夠了，需要提供可執行文件才能理解核心轉儲。