我有一个程序,当我从终端(没有 GDB)运行时会打印一些输出。假设输出看起来像
welcome to CMP simulator
initializing
finish initialization
now run
goodbye
现在,当我想使用 GDB 时,程序会给出一个 PID,然后我用它来附加到 GDB。假设程序的输出现在看起来像
welcome to CMP simulator
gdb - 5932 (Run this command on another terminal and type "continue" at GDB prompt)
当程序等待 SIGCONT 时,我gdb - 5932
在另一个终端上运行。当我输入“继续”时,GDB 报告如下崩溃:
Loaded symbols for /home/mahmood/results/temp/libCMP_iface_gcc.so
0x00007fd3a499fb7b in raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:42
42 ../nptl/sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.
(gdb) c
Continuing.
Program received signal SIGSTOP, Stopped (signal).
[Switching to Thread 0x7fd3a343f700 (LWP 21014)]
0x00007fd3a408e303 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87
87 ../sysdeps/unix/sysv/linux/poll.c: No such file or directory.
(gdb) bt
#0 0x00007fd3a408e303 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87
#1 0x00007fd3a4c0fc4c in ?? () from /home/mahmood/simics-3.0.31/amd64-linux/bin/libsimics-common.so
#2 0x00007fd3a4997e9a in start_thread (arg=0x7fd3a343f700) at pthread_create.c:308
#3 0x00007fd3a4099cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4 0x0000000000000000 in ?? ()
(gdb)
此时,程序仍在等待SIGCONT。
回溯是什么意思?正如您在没有 GDB 的情况下看到的那样,程序在输出上打印更多行。但是 GDB 显示崩溃。我的猜测是创建线程存在问题。
任何反馈表示赞赏。
更新:
如果我再次运行“继续”,我会在 GDB 上看到相同的输出
(gdb) c
Continuing.
Program received signal SIGSTOP, Stopped (signal).
0x00007f09b653c303 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout= <optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87
87 in ../sysdeps/unix/sysv/linux/poll.c
(gdb) bt
#0 0x00007f09b653c303 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87
#1 0x00007f09b70bdc4c in ?? () from /home/mahmood/simics-3.0.31/amd64-linux/bin/libsimics-common.so
#2 0x00007f09b6e45e9a in start_thread (arg=0x7f09b58ed700) at pthread_create.c:308
#3 0x00007f09b6547cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4 0x0000000000000000 in ?? ()
(gdb)
系统是ubuntu 12.04 amd64