From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Mon, 25 Oct 2004 07:51:37 +0000 Subject: Re: ptrace problem in 2.6.9 Message-Id: <16764.45193.900066.555108@napali.hpl.hp.com> List-Id: References: <20041022170557.GW19372@frankl.hpl.hp.com> In-Reply-To: <20041022170557.GW19372@frankl.hpl.hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Sat, 23 Oct 2004 01:25:42 -0700, David Mosberger said: >>>>> On Fri, 22 Oct 2004 10:05:57 -0700, Stephane Eranian said: Stephane> Hi Roland, I have some problems with the recent Stephane> modifications to the Ptrace infrastructure in 2.6.9 Stephane> release. Basically I have the smiple test program attached Stephane> to this E-mail and it hangs in 2.6.9 but not in Stephane> 2.6.9-rc4. Somehow the first waitpid() does not return. It Stephane> is not clear to me why. Is there something Ineed to Stephane> change in the call itself? I am running all of this on a Stephane> 2-way IA-64 machine with 2.6.9. I have not tried on x86. David> Shoot, I think I ran into the same problem yesterday when David> running the GCC testsuite. In my case, the problem seemed to David> disappear (mostly) after downgrading "expect" from the David> "unstable" to the "stable" version, but the symptoms where David> exactly like in your case: waitpid() didn't return, so I David> suspect it really was the kernel's fault. I'll try Roland's David> patch on Monday. Then again, may be not: it appears that the bug only relates to PTRACE'd processes, which "expect" is unlikely to do. Oh, well, would have been too easy. --david