./libtest.so: no such file or directory.
reading symbols from /lib64/libdl.so.2...done.
loaded symbols for /lib64/libdl.so.2
reading symbols from /lib64/libz.so.1...done.
loaded symbols for /lib64/libz.so.1
reading symbols from /usr/lib64/libaio.so.1...done.
loaded symbols for /usr/lib64/libaio.so.1
symbol file not found for ./libtest.so
reading symbols from /lib64/libc.so.6...done.
loaded symbols for /lib64/libc.so.6
reading symbols from /lib64/ld-linux-x86-64.so.2...done.
loaded symbols for /lib64/ld-linux-x86-64.so.2
reading symbols from /usr/lib64/libstdc++.so.6...done.
loaded symbols for /usr/lib64/libstdc++.so.6
reading symbols from /lib64/libm.so.6...done.
loaded symbols for /lib64/libm.so.6
reading symbols from /lib64/libgcc_s.so.1...done.
loaded symbols for /lib64/libgcc_s.so.1
reading symbols from /lib64/libpthread.so.0...done.
[thread debugging using libthread_db enabled]
[new thread 47461298698832 (lwp 14614)]
[new thread 1082132800 (lwp 14618)]
symbol file not found for ./libapr-1.so.0
reading symbols from /lib64/libcrypt.so.1...done.
loaded symbols for /lib64/libcrypt.so.1
reading symbols from /lib64/libnss_files.so.2...done.
loaded symbols for /lib64/libnss_files.so.2
0x00002b2a709a9ec1 in free () from /lib64/libc.so.6
(gdb) t 2
[switching to thread 2 (thread 1082132800 (lwp 14618))]#0 0x00002b2a709cf476 in poll () from /lib64/libc.so.6
(gdb) bt
#0 0x00002b2a709cf476 in poll () from /lib64/libc.so.6
#1 0x00002b2a70d6cf05 in ?? ()
#2 0x000000000053ab48 in ?? ()
#3 0x0000000040800100 in ?? ()
#4 0x0000000040800120 in ?? ()
#5 0x00002b2a7081553e in ?? ()
#6 0x0000271040800110 in ?? ()
#7 0x0000000b00000009 in ?? ()
#8 0x000000090000000b in ?? ()
#9 0x000000004c7f5412 in ?? ()
#10 0x000000000053ab48 in ?? ()
#11 0x0000000000000000 in ?? ()
仔細看後，原因再清楚不過了，ld_library_path沒有設定好，可能是因為執行
程式和gdb的環境不一樣，可以手工設定下ld_library_path，再gdb就ok了。
當gdb看到一行行的 時，你要冷靜！
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