linux-kernel - Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

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Date:	Tue, 1 Sep 2009 20:42:59 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

On Tuesday 01 September 2009, Mikael Pettersson wrote:
> Mikael Pettersson writes:
>  > Rafael J. Wysocki writes:
>  >  > On Saturday 29 August 2009, Mikael Pettersson wrote:
>  >  > > Mikael Pettersson writes:
>  >  > >  > Rafael J. Wysocki writes:
>  >  > >  >  > On Thursday 27 August 2009, Mikael Pettersson wrote:
>  >  > >  >  > > On Tue, 25 Aug 2009 22:34:53 +0200 (CEST), Rafael J. Wysocki wrote:
>  >  > >  >  > > > The following bug entry is on the current list of known regressions
>  >  > >  >  > > > from 2.6.30.  Please verify if it still should be listed and let me know
>  >  > >  >  > > > (either way).
>  >  > >  >  > > > 
>  >  > >  >  > > > 
>  >  > >  >  > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=3D14015
>  >  > >  >  > > > Subject		: pty regressed again, breaking expect and gcc's testsuite
>  >  > >  >  > > > Submitter	: Mikael Pettersson <mikpe@...uu.se>
>  >  > >  >  > > > Date		: 2009-08-14 23:41 (12 days old)
>  >  > >  >  > > > References	: http://marc.info/?l=3Dlinux-kernel&m=3D125029329805643&w=3D4
>  >  > >  >  > > 
>  >  > >  >  > > Not fixed. With 2.6.31-rc7 I'm still seeing repeatable testsuite
>  >  > >  >  > > failures on powerpc64. Reverting to 2.6.30 makes the failures go away.
>  >  > >  >  > 
>  >  > >  >  > Thanks for the update.
>  >  > >  >  > 
>  >  > >  >  > I guess 2.6.31-rc8 doesn't make any difference, does it?
>  >  > >  > 
>  >  > >  > I've scheduled a number of gcc bootstraps and testsuite runs
>  >  > >  > with -rc8 on x86, powerpc64, and arm. I'll post an update in
>  >  > >  > a day or so.
>  >  > > 
>  >  > > 2.6.31-rc8 results in bogus testsuite failures on all three platforms.
>  >  > 
>  >  > That may be a result of the known inotify borkage in -rc8 that has been fixed
>  >  > in the current Linus' tree.
>  > 
>  > No, it's the same old semi-random pty breakage. My kernels are built
>  > without inotify.
>  > 
>  > A bisection has identified Alan's
>  > 
>  > pty: Rework the pty layer to use the normal buffering logic
>  > d945cb9cce20ac7143c2de8d88b187f62db99bdc 
>  > 
>  > as the culprit. This patch introduces a massive number of bogus
>  > failures in the gcc testsuite. Subsequent pty/tty patches do fix
>  > most of those failures, but clearly not all.
> 
> Starting with 2.6.31-rc8 and reverting
> 
> 85dfd81dc57e8183a277ddd7a56aa65c96f3f487 pty: fix data loss when stopped (^S/^Q)
> d945cb9cce20ac7143c2de8d88b187f62db99bdc pty: Rework the pty layer to use the normal buffering logic
> 
> in that order gives me a kernel that works on both x86 and powerpc64.
> 
> So the bug is definitely limited to the pty buffering logic change.

Thanks a lot for this information, adding somme CCs to the list.

Best,
Rafael
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