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当gdb看到一行行的??时,你要冷静!

下面这段,初看一定会脑大,实际原因非常明确,所以遇到时要先观察,不一定是头大的问题。 gdb -p 1461 GNU gdb 6.6 Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB.  Type "show warranty" for details. This GDB was configured as "x86_64-suse-linux". Attaching to process 14614 Reading symbols from /home/zhangsan/bin/test...done. Using host libthread_db library "/lib64/libthread_db.so.1". Error while mapping shared library sections: ./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

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