GDB interaction with sigwait under Redhat 9.0

Daniel Jacobowitz drow@false.org
Thu May 13 13:30:00 GMT 2004


On Thu, May 13, 2004 at 05:33:18AM -0400, Paul Hilfinger wrote:
> 
> > On Wed, May 12, 2004 at 04:33:48AM -0400, Paul Hilfinger wrote:
> > > 
> > > I recently submitted PR threads/1641 concerning a problem we seem to
> > > be having with Redhat 9.0 (Linux ... 2.4.21-9.ELsmp #1 SMP Thu Jan 8
> > > 17:08:56 EST 2004 i686 i686 i386 GNU/Linux).  It appears that on that
> > > system, there is a new, malign interaction of sigwait in the inferior
> > > with ptrace.  First, GDB (head version from about mid-April), no
> > > longer sees signals sent to an inferior that is waiting on sigwait.  Second,
> > > GDB's manipulation with the inferior causes sigwaits (at least on 
> > > pthreaded programs) to continue with a non-zero status code (EINTR to 
> > > be precise).  Does anyone know anything about this rather drastic change
> > > in sigwait's behavior?   I intend to submit a GNU/Linux bug report, unless 
> > > someone knows a good reason for this new (apparently undocumented) spec.
> > 
> > However, you never
> > said what version of the Linux kernel you were using - it does not look
> > like 2.6 can produce this result.  But then I don't see how an
> > unmodified 2.4 can either.
> 
> Sorry; I thought the 2.4.21-9.ELsmp part of the uname -a line was 
> sufficient.  In fact, not being a kernel hacker myself, I'm not sure what
> information you're looking for here.

Oh, it is - I just missed it.  Sounds like you want to talk to your
kernel vendor.

-- 
Daniel Jacobowitz



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