Debugging and NPTL

[Daniel Jacobowitz]

On Mon, May 17, 2004 at 04:59:30PM -0400, Ali Ijaz Sheikh wrote:
> Quoting Daniel Jacobowitz <drow at false.org>:
> 
> > On Mon, May 17, 2004 at 03:11:45PM -0400, Ali Ijaz Sheikh wrote:
> > >
> > > Hi,
> > >
> > > I have recently started seeing some problems with debugging of
> > multithreaded
> > > applications with NPTL on 2.6 series kernels.  It seems that GDB is no
> > longer
> > > being informed of the events occurring in the child threads because
> > > create_thread (nptl/sysdeps/pthread/create_thread.c) routine does not pass
> > the
> > > CLONE_PTRACE flag to the clone system call.  For example, if the child
> > thread
> > > gets a SEGV, the whole thread group is terminated without GDB ever being
> > told.
> > >
> > > When creating a thread in a thread group that is being ptraced, shouldn't
> > the
> > > child thread be created with a CLONE_PTRACE?  It this a nptl bug?  Or is
> > this
> > > GDB's fault?
> > >
> > > A simple program that creates a thread and does raise(SIGSEGV) in the child
> > > thread can be used to reproduce this problem.  Try running that in gdb.
> >
> > No, it should not be using CLONE_PTRACE.  You didn't say what version
> > of GDB you were using; you may want to try a newer one.
> >
> > --
> > Daniel Jacobowitz
> >
> 
> I have tried this with GDB 6.0 and 6.1.

GDB 6.1 should support NPTL out of the box.

-- 
Daniel Jacobowitz