[Bug 29787] New: random XRandR failures (i2c related?)

* [Bug 29787] New: random XRandR failures (i2c related?)
@ 2010-08-24 19:54 bugzilla-daemon
  2010-08-28 12:39 ` [Bug 29787] " bugzilla-daemon
                   ` (20 more replies)
  0 siblings, 21 replies; 22+ messages in thread
From: bugzilla-daemon @ 2010-08-24 19:54 UTC (permalink / raw)
  To: dri-devel

https://bugs.freedesktop.org/show_bug.cgi?id=29787

           Summary: random XRandR failures (i2c related?)
           Product: DRI
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: aelschuring@hotmail.com

A few weeks ago, X started displaying weird errors during normal use. These
range from simple output resets to application crashes due to X BadAlloc
responses. In detail, this is what I see happening:

- output blink. Usually the screen goes dark for about a second. When the
screen returns, I see either:
- display position getting cancelled (xrandr --pos 0x0) on my left screen
  when this happens I can usually get it back to the correct position via the
xrandr command line tool, but sometimes that triggers a WM crash
- display rotation getting cancelled (xrandr --rotate normal) on the right
screen. When this happens:
  - quodlibet (python-gtk app) crashing with BadAlloc (serial 255 error_code 11
request_code 53 minor_code 0). It will keep crashing like this until I restart
X
  - whatever other app I had running on the right screen has disappeared as
well
  - window manager (e17) crashing. It can recover succesfully, though
  - when I re-enable screen rotation, the display gets completely garbled

I have started seeing this happen with 2.6.35-rc3 (was running 2.6.34-rc6
before that), and with 2.6.35.1 this happens a lot less frequently (from once a
day to twice in a week).

>From the latest crash, I can give the following info from xsession-errors:
(E17 init)
  E17 INIT: XINERAMA CHOSEN: [1], 1080x1920+1280+0
  E17 INIT: XINERAMA CHOSEN: [0], 1280x1024+0+896
(output blinking starts)
  E17 INIT: XINERAMA SCREEN: [0], 1280x1024+0+0
  E17 INIT: XINERAMA CHOSEN: [153045780], 0x153045764+0+153046580
(e17 crash, try to recover)
  E17 INIT: XINERAMA CHOSEN: [1], 1920x1080+1280+0
  E17 INIT: XINERAMA CHOSEN: [0], 1280x1024+0+0
(rotation lost on [1], position lost on [0])
  E17 INIT: XINERAMA CHOSEN: [1], 1080x1920+1280+0
  E17 INIT: XINERAMA CHOSEN: [141138596], 0x141138580+0+141139396
  E17 INIT: XINERAMA CHOSEN: [0], 1280x1024+0+896
(restoring rotation confuses E17)
  ###!!! ABORT: X_CreatePixmap: BadAlloc (insufficient resources for
operation);
 6 requests ago: file nsX11ErrorHandler.cpp, line 182
  UNKNOWN [/usr/lib/xulrunner-1.9.2/libxul.so +0x001CA781]
(firefox crashing)

Now, the reason for the E17 crash looks like a use-after-free bug. Question is:
who is freeing the Xinerama structures, and why are they freed at all? I never
had these problems before, and when using stock 2.6.32 (from Debian) I don't
have these problems either, so I'm ruling out hardware failure.

I can see the following lines logged by the kernel (KMS enabled on radeon
9550):
  [12045.280155] [drm:radeon_dvi_detect] *ERROR* DVI-I-1: probed a monitor but
no|invalid EDID
  [13500.386132] [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but
no|invalid EDID
  [13797.568760] [drm:radeon_dvi_detect] *ERROR* DVI-I-1: probed a monitor but
no|invalid EDID
And I believe these are harmless (and reported in #27708). I can see these
messages being reported for as long my kernel logs go back. But when the
crashes occur, they are followed by these lines:
  [35753.097508] i2c i2c-1: sendbytes: NAK bailout.
  [35762.752866] i2c i2c-1: sendbytes: NAK bailout.
  [35772.912023] i2c i2c-1: readbytes: ack/nak timeout
Which I believe are not so harmless. Or they could be a red herring, I'm not
qualified to tell.

Since the same time, I've been seeing a lot of lines logged by g-s-d, like
  gdk_pixbuf_format_get_name: assertion `format != NULL' failed
But I do not believe these are relevant.

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