(gdb) c Continuing. Program terminated with signal SIGTRAP, Trace/breakpoint trap. The program no longer exists. One of the reasons this may happen is when your GDB loads "wrong"libthread_db.so(one that doesn't match the targetlibc.so.6)....
PTRACE_TRACEME:表示此进程将被父进程跟踪,任何信号(除了 SIGKILL)都会暂停子进程,接着阻塞于 wait() 等待的父进程被唤醒。子进程内部对 exec() 的调用将发出 SIGTRAP 信号,这可以让父进程在子进程新程序开始运行之前就完全控制它 PTRACE_ATTACH:attach 到一个指定的进程,使其成为当前进程跟踪的子进程,而子进程的...
当前进程接收到 SIGTRAP 时通过 do_signal() 进行处理:如果自己被标记为被追逐状态,则使当前进程暂停,并向主进程发送 SIGCHLD 信号。 int do_signal(struct pt_regs *regs, sigset_t *oldset) { for (;;) { unsigned long signr; spin_lock_irq(¤t->sigmask_lock); signr = dequeue_signal(&curr...
(gdb) run Starting program: /home/arv/0_test/example Program received signal SIGSEGV, Segmentation fault. 0x0000555555555179 in foo_len (s=0x0) at example.c:7 7 return strlen(s); (gdb) print s$1 = 0x0 问题在源码第 7 行调用函数strlen时出现(因为它的参数s是NULL)。gdb运行的实际情况可能...
面临问题:一般情况下,如果被gdb调试的程序中调用fork派生出一个新的子进程,这时gdb调试的仍然还是父进程,其子进程的执行不被理会。如果之前你在子进程的执行routine上设置了断点,那么当子进程执行到那个断点时,子进程会因为收到一个SIGTRAP信号而自行终止,除非你在子进程中拦截了该信号。
Program received signal SIGTRAP, Trace/breakpoint trap. 0x00065e36 in ?? () (cskygdb) disa disable disassemble (cskygdb) disa disable disassemble (cskygdb) disassemble No function contains program counter for selected frame. (cskygdb) disassemble $pc,$pc+30 ==》确认地址是否跟反汇编处的地...
Program received signal SIGTRAP, Trace/breakpoint trap. 0x0000000004963fb4 in write () from /lib64/libc.so.6 But how is this possible? Valgrind points to line 45 of theexample.ccode, where the structure b2 is written to the file. When looking at the code, you can see that the structu...
当我们通过b或者break设置断点时候,就是在指定位置插入断点指令,当被调试的程序运行到断点的时候,产生SIGTRAP信号。该信号被gdb捕获并 进行断点命中判断。 设置原理 在程序中设置断点,就是先在该位置保存原指令,然后在该位置写入int 3。当执行到int 3时,发生软中断,内核会向子进程发送SIGTRAP信号。当然,这个信号会转...
Program received signal SIGTRAP, Trace/breakpoint trap. main (argc=1, argv=0xbffff064) at test.cpp:23 23 delete pObject; (gdb)print pObject $1 = (BaseClass *) 0x804b008 (gdb)info vtbl pObject vtable for 'BaseClass' @ 0x80486c8 (subobject @ 0x804b008): ...
一般情况下,如果被gdb调试的程序中调用fork派生出一个新的子进程,这时gdb调试的仍然还是父进程,其子进程的执行不被理会。如果之前你在子进程的执行routine上设置了断点,那么当子进程执行到那个断点时,子进程会因为收到一个SIGTRAP信号而自行终止,除非你在子进程中拦截了该信号。