linux-kernel - Re: 2.6.30-rc6: Reported regressions from 2.6.29

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Message-ID: <20090518151102.GA6241@elte.hu>
Date:	Mon, 18 May 2009 17:11:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Jonathan Corbet <corbet@....net>, Martin Bammer <mrb74@....at>,
	Jeff Garzik <jgarzik@...ox.com>,
	Kumar Gala <galak@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux PM List <linux-pm@...ts.linux-foundation.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	DRI <dri-devel@...ts.sourceforge.net>
Subject: Re: 2.6.30-rc6: Reported regressions from 2.6.29


* Oleg Nesterov <oleg@...hat.com> wrote:

> On 05/17, Ingo Molnar wrote:
> >
> > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13107
> > > Subject		: LTP 20080131 causes defunct processes w/2.6.30-rc1
> > > Submitter	: Kumar Gala <galak@...nel.crashing.org>
> > > Date		: 2009-04-09 15:43 (38 days old)
> > > First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b3bfa0cba867f23365b81658b47efd906830879b
> > > References	: http://marc.info/?l=linux-kernel&m=123929187208953&w=4
> > > 		  http://lkml.org/lkml/2009/4/10/193
> > > Handled-By	: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
> >
> > Oleg says in that thread that it's as-designed, and followup
> > questions were not replied to (yet).
> 
> Yes, I think this is false alarm. Perhaps I missed something, and 
> I am waiting for more info from Kumar, but it looks like ltp was 
> already changed to skip the "{ PTRACE_ATTACH, 1, EPERM }" test on 
> kernels after 2.6.25

Btw., why did the patch (and the revert) make any difference to the 
test? Timing differences look improbable.

	Ingo
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