Bug 11215

Summary:	INFO: possible recursive locking detected ps2_command
Product:	Drivers	Reporter:	Rafael J. Wysocki (rjw)
Component:	Input Devices	Assignee:	drivers_input-devices
Status:	RESOLVED OBSOLETE
Severity:	normal	CC:	a.p.zijlstra, akpm, alan, bunk, dmitry.torokhov, florian, m.s.tsirkin, marcus, rabin, witold.baryluk+kernel, zdenek.kabelac
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.39-rc7	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	11167

Description Rafael J. Wysocki 2008-08-01 13:48:01 UTC

Subject    : INFO: possible recursive locking detected ps2_command
Submitter  : "Zdenek Kabelac" <zdenek.kabelac@gmail.com>
Date       : 2008-07-31 9:41
References : http://marc.info/?l=linux-kernel&m=121749737011637&w=4

This entry is being used for tracking a regression from 2.6.26.  Please don't
close it until the problem is fixed in the mainline.

Comment 1 Andrew Morton 2008-08-01 14:00:28 UTC

Methinks this should be assigned to Dmitry, not Russell.

Comment 2 Dmitry Torokhov 2008-08-01 14:12:49 UTC

Actually Peter... I don't know why lockdep annotation only works first time around.

Comment 3 Rafael J. Wysocki 2008-08-07 15:26:11 UTC

Handled-By : Dmitry Torokhov <dmitry.torokhov@gmail.com>

Comment 4 Dmitry Torokhov 2008-08-07 17:31:57 UTC

No, it is not handled by me. As far as I know locking in serio and psmouse is correct and I do not know lockdep well enough to tell why the annotation on pass-through port works only once.

Comment 5 Rafael J. Wysocki 2008-08-08 03:46:15 UTC

Not-Handled-By : Dmitry Torokhov <dmitry.torokhov@gmail.com>

Comment 6 Rafael J. Wysocki 2008-08-08 13:49:30 UTC

Handled-By : Peter Zijlstra <a.p.zijlstra@chello.nl>

Comment 7 Zdenek Kabelac 2008-08-12 02:13:08 UTC

Just an update as a response to automatically generated request message from Rafael - this trace is still displayed when PS2 mouse is reattached to my docking station.

Tested with todays kernel commit: 10fec20ef5eec1c91913baec1225400f0d02df40

Comment 8 Zdenek Kabelac 2008-08-27 02:58:36 UTC

Warning message still present with commit: (Tue Aug 26 10:45:20 2008)
1941246dd98089dd637f44d3bd4f6cc1c61aa9e4

Comment 9 Zdenek Kabelac 2008-11-05 05:18:41 UTC

Obviously no one has made any updates in lockdep checker neither in ps2 driver - so I still get the same INFO call while using 2.6.28-rc3 kernel

Comment 10 Rafael J. Wysocki 2008-11-09 13:23:58 UTC

Not-Handled-By : Peter Zijlstra <a.p.zijlstra@chello.nl>

Comment 11 Zdenek Kabelac 2008-12-13 16:34:47 UTC

This INFO trace is still present in 2.6.28-rc8 - someone should probably check if the nesting of this lock is properly marked in the source, so the lockdep validator could be quiet.

Comment 12 Dmitry Torokhov 2009-09-05 03:56:01 UTC

*** Bug 11662 has been marked as a duplicate of this bug. ***

Comment 13 Dmitry Torokhov 2010-02-22 22:10:03 UTC

*** Bug 15371 has been marked as a duplicate of this bug. ***

Comment 14 Florian Mickler 2010-08-16 13:18:57 UTC

Hum... I _guess_ this is still present. 
Nobody here wanna show off a little lockdep-fu?

Comment 15 Witold Baryluk 2011-08-28 21:53:20 UTC

Hey. I reported similar report few months ago. See bug #34922 . It happened when resuming my ThinkPad T43. I was not using any docking station, and was just using internal tracpoint and/or touchpad. So it is essentially impossible it was disconected physically. It can still be possible there were some power fluctutations and trackpoint chipset performed reset, and this triggered this problem. It can be also purly software problem in kernel.

Comment 16 Alan 2012-05-22 13:08:31 UTC

*** Bug 34922 has been marked as a duplicate of this bug. ***