Hi,
I have a program compiled with -pthread and I'm trying to use gdb to debug
it. I run the program in one window and then try to attach to it from
another. I have put a sleep 10 in the program so I can catch it before it
enters the section I want to debug. This is what I get:
Attaching to program: /usr/home/andrew/work/msgs2/msgs, process 10063
Reading symbols from /usr/lib/libc_r.so.4...done.
Reading symbols from /usr/libexec/ld-elf.so.1...done.
0x280b7368 in _thread_sys_poll () from /usr/lib/libc_r.so.4
(gdb) n
Single stepping until exit from function _thread_sys_poll,
which has no line number information.
0x280b674f in _thread_kern_sched_state_unlock () from /usr/lib/libc_r.so.4
(gdb) n
Single stepping until exit from function _thread_kern_sched_state_unlock,
which has no line number information.
0x280b5f99 in _thread_kern_sched () from /usr/lib/libc_r.so.4
(gdb) n
Single stepping until exit from function _thread_kern_sched,
which has no line number information.
0x28078a70 in _init () from /usr/lib/libc_r.so.4
(gdb) n
Single stepping until exit from function _init,
which has no line number information.
Error accessing memory address 0x158: Bad address.
(gdb) n
Single stepping until exit from function _thread_kern_sched,
which has no line number information.
Program received signal SIGSEGV, Segmentation fault.
0x280b591f in _thread_kern_sched () from /usr/lib/libc_r.so.4
(gdb) q
The program is running. Quit anyway (and detach it)? (y or n) y
Detaching from program: /usr/home/andrew/work/msgs2/msgs, process 10063,
thread 1
ptrace: No such process.
(gdb)
To get out of gdb I need to suspend and kill it. Now this certainly isn't
the behaviour I get when running it without the debuger. I haven't spawned
any threads at this point.
Any ideas what I'm doing wrong?
Thanks,
Andrew
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