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Message-Id: <200908031810.00505.rjw@sisk.pl>
Date: Mon, 3 Aug 2009 18:09:58 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Adrian Bunk <bunk@...nel.org>,
Andrew Morton <akpm@...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>,
Mikael Pettersson <mikpe@...uu.se>
Subject: Re: 2.6.31-rc5: Reported regressions from 2.6.30
On Monday 03 August 2009, Johannes Weiner wrote:
> On Sun, Aug 02, 2009 at 03:22:01PM -0700, Linus Torvalds wrote:
>
> > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13815
> > > Subject : emacs -nw compilation doesn't show the error message
> > > Submitter : Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> > > Date : 2009-07-23 06:22 (11 days old)
> > > First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d945cb9cce20ac7143c2de8d88b187f62db99bdc
> >
> > Same old pty bug, same fix: commit e043e42bdb.
> >
> > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13813
> > > Subject : Hangups in n_tty_read()
> > > Submitter : Johannes Weiner <hannes@...xchg.org>
> > > Date : 2009-07-16 18:48 (18 days old)
> > > References : http://marc.info/?l=linux-kernel&m=124777019920579&w=4
> >
> > Hmm. Worth testing that same fix, although the symptoms here are not
> > exactly the same.
>
> Hm, I had no debugging enabled, but I think a silent hang in
>
> pty_write()
> tty_flip_buffer_push()
> flush_to_ldisc()
>
> can cause the receiving side
>
> tty_read()
> n_tty_read()
>
> to wait forever for updates. I haven't looked closely. It seems to
> be gone with your latest master in any case.
Thanks, closed (in fact I closed it earlier already).
Rafael
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