Re: [regression] Re: 2.6.31-rc2: X stop accepting keystrokes?

Re: [regression] Re: 2.6.31-rc2: X stop accepting keystrokes?

[Jiri Kosina]

[ adding some CCs ]

On Fri, 17 Jul 2009, Pavel Machek wrote:

> On Wed 2009-07-15 15:16:11, Pavel Machek wrote:
> > Hi!
> > 
> > > ...it happened second time now.  In one case, ctrl-alt-backspace
> > > helped and I got at least console back, in the other case I had to
> > > reboot using sysrq.
> > > 
> > > ...hmm. It was probably same crash, because console switching has
> > > probably been locked by X, and I have just one console. I ended up on
> > > empty console before.
> > 
> > It happened four times now. It seems to happen when I type heavily. I
> > was once able to reproduce it by hitting keys heavily/randomly.
> 
> Two more crashes today :-(. -rc2 is pretty much unusable.
> 
> ...and they seem to be slightly different crashes. Once keyboard was
> dead but mouse worked, second time keyboard still worked but xterms
> kept locking up. I managed to type dmesg into one of them, but that
> xterm hung in middle of dump :-(.

I guess that both keyboard and mouse are PS/2 connected, right?

Any possibility to capture serial console output?

-- 
Jiri Kosina
SUSE Labs

xterms freezing on 2.6.31-rc2 (was Re: [regression] Re: 2.6.31-rc2: X stop accepting keystrokes?)

[Pavel Machek]

On Fri 2009-07-17 15:01:47, Jiri Kosina wrote:
> 
> [ adding some CCs ]
> 
> On Fri, 17 Jul 2009, Pavel Machek wrote:
> 
> > On Wed 2009-07-15 15:16:11, Pavel Machek wrote:
> > > Hi!
> > > 
> > > > ...it happened second time now.  In one case, ctrl-alt-backspace
> > > > helped and I got at least console back, in the other case I had to
> > > > reboot using sysrq.
> > > > 
> > > > ...hmm. It was probably same crash, because console switching has
> > > > probably been locked by X, and I have just one console. I ended up on
> > > > empty console before.
> > > 
> > > It happened four times now. It seems to happen when I type heavily. I
> > > was once able to reproduce it by hitting keys heavily/randomly.
> > 
> > Two more crashes today :-(. -rc2 is pretty much unusable.
> > 
> > ...and they seem to be slightly different crashes. Once keyboard was
> > dead but mouse worked, second time keyboard still worked but xterms
> > kept locking up. I managed to type dmesg into one of them, but that
> > xterm hung in middle of dump :-(.
> 
> I guess that both keyboard and mouse are PS/2 connected, right?

Thinkpad internal keyboard/mouse, yes.

> Any possibility to capture serial console output?

I managed to get dmesg via magic sysrq at some point. I got some
softlockup messages and processes seemed to hang.

I'm no  longer sure how much keyboard related it is. It seems to
happen while typing, but ... the system still reacts to keyboard but
xterms hang. 
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: xterms freezing on 2.6.31-rc2 (was Re: [regression] Re: 2.6.31-rc2: X stop accepting keystrokes?)

[Jiri Kosina]

On Fri, 17 Jul 2009, Pavel Machek wrote:

> > > ...and they seem to be slightly different crashes. Once keyboard was
> > > dead but mouse worked, second time keyboard still worked but xterms
> > > kept locking up. I managed to type dmesg into one of them, but that
> > > xterm hung in middle of dump :-(.
> > 
> > I guess that both keyboard and mouse are PS/2 connected, right?
> 
> Thinkpad internal keyboard/mouse, yes.
> 
> > Any possibility to capture serial console output?
> 
> I managed to get dmesg via magic sysrq at some point. I got some
> softlockup messages and processes seemed to hang.

Softlockup in which area?

Are you able to ssh into the machine? Where do the xterms hang? 
(/proc/<pid>/stack)

> I'm no  longer sure how much keyboard related it is. It seems to
> happen while typing, but ... the system still reacts to keyboard but
> xterms hang. 

Could this be related to

	http://lkml.org/lkml/2009/7/16/268

?

-- 
Jiri Kosina
SUSE Labs

Re: xterms freezing on 2.6.31-rc2 (was Re: [regression] Re: 2.6.31-rc2: X stop accepting keystrokes?)

[Pavel Machek]

On Fri 2009-07-17 15:13:41, Jiri Kosina wrote:
> On Fri, 17 Jul 2009, Pavel Machek wrote:
> 
> > > > ...and they seem to be slightly different crashes. Once keyboard was
> > > > dead but mouse worked, second time keyboard still worked but xterms
> > > > kept locking up. I managed to type dmesg into one of them, but that
> > > > xterm hung in middle of dump :-(.
> > > 
> > > I guess that both keyboard and mouse are PS/2 connected, right?
> > 
> > Thinkpad internal keyboard/mouse, yes.
> > 
> > > Any possibility to capture serial console output?
> > 
> > I managed to get dmesg via magic sysrq at some point. I got some
> > softlockup messages and processes seemed to hang.
> 
> Softlockup in which area?

Sorry, I did not write it down :-(.

> Are you able to ssh into the machine? Where do the xterms hang? 
> (/proc/<pid>/stack)

I was not able to capture that. I'll try pen and paper next :-).

> > I'm no  longer sure how much keyboard related it is. It seems to
> > happen while typing, but ... the system still reacts to keyboard but
> > xterms hang. 
> 
> Could this be related to
> 
> 	http://lkml.org/lkml/2009/7/16/268

Actually... that sounds suspiciously like it. I'll try -rc3 update.

									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: xterms freezing on 2.6.31-rc2 (was Re: [regression] Re: 2.6.31-rc2: X stop accepting keystrokes?)

[Pavel Machek]

On Fri 2009-07-17 15:13:41, Jiri Kosina wrote:
> On Fri, 17 Jul 2009, Pavel Machek wrote:
> 
> > > > ...and they seem to be slightly different crashes. Once keyboard was
> > > > dead but mouse worked, second time keyboard still worked but xterms
> > > > kept locking up. I managed to type dmesg into one of them, but that
> > > > xterm hung in middle of dump :-(.
> > > 
> > > I guess that both keyboard and mouse are PS/2 connected, right?
> > 
> > Thinkpad internal keyboard/mouse, yes.
> > 
> > > Any possibility to capture serial console output?
> > 
> > I managed to get dmesg via magic sysrq at some point. I got some
> > softlockup messages and processes seemed to hang.
> 
> Softlockup in which area?
> 
> Are you able to ssh into the machine? Where do the xterms hang? 
> (/proc/<pid>/stack)

I have not seen it for a while with new kernel, so I assume problem is gone.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html