Re: rc6 keeps hanging and blanking displays - bisection complete

[Helge Hafting <helgehaf@aitel.hist.no>]

On Mon, Aug 15, 2005 at 03:59:07PM -0700, Linus Torvalds wrote:
> 
> 
> On Tue, 16 Aug 2005, Helge Hafting wrote:
> >
> > This was interesting.  At first, lots of kernels just kept working,
> > I almost suspected I was doing something wrong. Then the second last kernel
> > recompiled a lot of DRM stuff - and the crash came back!
> > The kernel after that worked again, and so the final message was:
> > 
> > 561fb765b97f287211a2c73a844c5edb12f44f1d is first bad commit
> 
> Ok, that definitely looks bogus. 
> 
> That commit should not matter at _all_, it only changes ppc64 specific 
> things. 
> 
> If the bug is sometimes hard to trigger, maybe one of the "good" kernels 
> wasn't good after all. That would definitely throw a wrench in the 
> bisection.
> 
The hang, or at least an X "pause" tends to happen in 5-10 minutes of
playing cuyo. (�2D game).  I have now had the last good kernel
(6ade43fbbcc3c12f0ddba112351d14d6c82ae476) running for almost 24
hours, only interrupted by the brief test of drm-less rc6.

Normal use haven't provoked anything. Since DRM sort of works with this
kernell, I tried tuxracer on the radeon.  (Trouble is always with
the radeon, never the mga xserver).  I played several games, ok
except for the usual lousy 5-9 fps. One time I had a "pause", the 3D-game
just froze for about half a minute.  The other xserver kept
displaying firefox (and updating the page too) but I could not
start any processes there.  I tried starting an xterm - it did not
appear until tuxracer "unfroze" and continued as if nothing happened. 
Perhaps the frozen process held a lock? 

Disk io seemed sluggish after that incident, and the load meter in
icewm seemed to indicate more waiting than usual.  The logs tells
me of SCSI aborts and a bus reset.  I booted into drm-less rc6 after
that.  

Some interrupts are shared on this machine:
$ cat /proc/interrupts 
           CPU0       
  0:   10113154    IO-APIC-edge  timer
  1:        371    IO-APIC-edge  i8042
  2:          0          XT-PIC  cascade
  4:       5735    IO-APIC-edge  serial
  8:          0    IO-APIC-edge  rtc
 12:      11024    IO-APIC-edge  i8042
 14:         21    IO-APIC-edge  ide0
 16:     803248   IO-APIC-level  sym53c8xx, eth0, mga@pci:0000:01:00.0
 17:          0   IO-APIC-level  Trident Audio
 19:     755535   IO-APIC-level  radeon@pci:0000:00:08.0
 20:       5946   IO-APIC-level  libata
 21:       9448   IO-APIC-level  ehci_hcd:usb1, uhci_hcd:usb2, uhci_hcd:usb3, 
uhci_hcd:usb4
NMI:        234 
LOC:   10111810 
ERR:          0
MIS:          0

The troublesome radoen has a irq of its own.  The scsi controller
shares irq with the matrox g550, but that card never seem to
cause any trouble, other than saturating the cpu during games. :-)

On to look at iomem and that rc6 crash.

Helge Hafting
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