linux-kernel - Re: 2.6.31-rc5: Reported regressions from 2.6.30

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Message-ID: <20090803143108.GA12041@cmpxchg.org>
Date:	Mon, 3 Aug 2009 16:31:08 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 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.

	Hannes
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