glibc-2.3.3 / gdb/gdbserver 6.3: can't debug threads

glibc-2.3.3 / gdb/gdbserver 6.3: can't debug threads

[Olivier Singla]

Hi,

I am unsuccessful to debug threads with gdb (fc3) and gdbserver (powerpc 
target).

Here is my .gdbinit:
set auto-solib-add 1
set solib-absolute-prefix 
/opt/crosstool/powerpc-linux/gcc-3.4.1-glibc-2.3.3/powerpc-linux
target remote 10.128.128.251:9000
set confirm off
sym ./test -readnow
handle SIG32 nostop noprint
break main
shared
cont
shared
info sharedlibrary

Problem is that I can't see the threads while debugging, but only the 
main thread.
When I try to put a breakpoint to put thread function I then have:
Program received signal SIGTRAP, Trace/breakpoint trap.

Also, I always have:
No shared libraries loaded at this time.

If I debug the same program compiled for x86 on the PC, I can see
all the shared libraries that gdb has loaded. For some reason, that's
failing with gdbserver.

When I run gdb with strace, I don't see that gdb try to load 
libthread_db.so,
as I think it should.

I have tried with versions 5.3, 6,2 and 6.3 of gdb/gdbserver.

Any idea what is wrong ?

Thanks in advance,
Olivier

Re: glibc-2.3.3 / gdb/gdbserver 6.3: can't debug threads

[Daniel Jacobowitz]

On Tue, Feb 22, 2005 at 11:15:14PM -0500, Olivier Singla wrote:
> Hi,
> 
> I am unsuccessful to debug threads with gdb (fc3) and gdbserver (powerpc 
> target).
> 
> Here is my .gdbinit:
> set auto-solib-add 1
> set solib-absolute-prefix 
> /opt/crosstool/powerpc-linux/gcc-3.4.1-glibc-2.3.3/powerpc-linux
> target remote 10.128.128.251:9000
> set confirm off
> sym ./test -readnow

Try using "file" instead of symbol-file.

> handle SIG32 nostop noprint
> break main
> shared
> cont
> shared
> info sharedlibrary
> 
> Problem is that I can't see the threads while debugging, but only the 
> main thread.
> When I try to put a breakpoint to put thread function I then have:
> Program received signal SIGTRAP, Trace/breakpoint trap.
> 
> Also, I always have:
> No shared libraries loaded at this time.
> 
> If I debug the same program compiled for x86 on the PC, I can see
> all the shared libraries that gdb has loaded. For some reason, that's
> failing with gdbserver.
> 
> When I run gdb with strace, I don't see that gdb try to load 
> libthread_db.so,
> as I think it should.

No, cross-gdb should not load the host's libthread_db.

-- 
Daniel Jacobowitz
CodeSourcery, LLC