shlibs/1990: Can't step in shared-library code of attached process

quiver2k@ybb.ne.jp quiver2k@ybb.ne.jp
Thu Aug 25 01:38:00 GMT 2005


>Number:         1990
>Category:       shlibs
>Synopsis:       Can't step in shared-library code of attached process
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 15 06:28:00 UTC 2005
>Closed-Date:
>Last-Modified:
>Originator:     quiver2k@ybb.ne.jp
>Release:        unknown-1.0
>Organization:
>Environment:
My Environments are:
CPU: Intel(R) Celeron(R) CPU 2.40GHz
OS: Fedora core 3
Kernel: 2.6.12 (kernel-2.6.12-1.1372_FC3)
gdb: 6.3
>Description:
I'm trying to step into shared-library code of attached process. I can't step into library-function at the first call. But I can step in the function at the second call. Can I step into library-function at the first the?

The followings are sample code:
void foo() {
    printf("foo\n");
}

int main(int argc, char *argv[])
{
    char buf[128];

    printf("attach me(pid=%d)> ", getpid());
    fgets(buf, sizeof(buf), stdin);

    foo();

    bar(); /* can't step-in */
    bar();
    bar();

    return 0;
}

Here, function bar() is defined in the shared library libbar.so.

To step into bar, I took the followings:
1. This program prompts "attach me(pid=18130)>".
2. I attached the process with id 18130
3. I set a break point at "foo();" in main
4. I typed "info sharedlibrary"

(gdb) info sharedlibrary
> From        To          Syms Read   Shared Object Library
0xb7f6644c  0xb7f66564  Yes         /home/yendoh/link/libbar.so
0x0088cc00  0x0097ccd0  Yes         /lib/tls/libc.so.6
0x008197a0  0x0082b58f  Yes         /lib/ld-linux.so.2

5. continued
6. The process was breakd at "foo():", I could step-in foo().
7. I tried to step into "bar();" , but I couldn't step-in.
8. I could step-in the second and third call of bar().
>How-To-Repeat:
I attached my-program. To run the program:
1. make
2. make run
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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