[i855 i915] Xorg crashed with SIGSEGV in drm_intel_bo_unpin()

Created an attachment (id=24448)
xorg.conf

I've just gotten about five crashes of the X server, each with the backtrace:

0: X(xorg_backtrace+0x26) [0x4ea426]
1: X(xf86SigHandler+0x39) [0x47e0f9]
2: /lib/libc.so.6 [0x7f4d381e7040]
3: /usr/lib/libdrm_intel.so.1(drm_intel_bo_unpin+0) [0x7f4d3705db70]
4: /usr/lib64/xorg/modules/drivers//intel_drv.so [0x7f4d3729cb89]
5: /usr/lib64/xorg/modules/drivers//intel_drv.so(i830_crtc_dpms_video+0x4a) [0x7f4d3729cc0a]
6: /usr/lib64/xorg/modules/drivers//intel_drv.so [0x7f4d37289fa1]
7: X(xf86DPMSSet+0x95) [0x4a3805]
8: X(xf86SaveScreen+0x29) [0x4a3fa9]
9: X(dixSaveScreens+0x241) [0x43a2d1]
10: X [0x4e733b]
11: X [0x4e7728]
12: X(WaitForSomething+0x56b) [0x4e7d7b]
13: X(Dispatch+0x7f) [0x449fff]
14: X(main+0x44d) [0x430b2d]
15: /lib/libc.so.6(__libc_start_main+0xe6) [0x7f4d381d25c6]
16: X [0x42ff19]

The crashes only seem to happen when I'm not using the X server (probably right when it turns off the monitors): the system seems quite reliable so long as I'm actually using it. But then when I go away, and come back to find the monitors in power-saving mode, often the server has crashed, leaving the keyboard in an unusable state, requiring a reboot via the power button.

My setup is:

G965 with dual-DVI ADD2 card, driving two monitors.
Gentoo Linux
xf86-video-intel-2.6.3-r1
libdrm-2.4.5
xorg-server-1.5.3-r5
Linux kernel 2.6.29. (I also tested it with 2.6.28, and got the same crash.)

Created an attachment (id=24449)
Xorg.0.log

I'm willing to help debug this one; please let me know what additional information would be desirable.

Some more information: the crashes only seem to occur after the video overlay (Xv adaptor 1) has been used. That is, if I play a video using the video overlay, then later let DPMS activate, the X server crashes on DPMS activation; this seems to happen every time. If I use the textured video adaptor instead, crashes don't seem to happen at all. At least that's the pattern so far.

I think this is fixed upstream already, can you try git master or this patch on top of your 2.6.3 driver?

commit 74d0713e002a9781ed00fdd10eb6f75907ae796c
Author: Kalev Lember <email address hidden>
Date: Fri Mar 20 02:21:41 2009 +0200

    Fix VT switch with XV overlay video enabled.

    drm_intel_bo_unpin() was called with NULL argument.

    Signed-off-by: Kalev Lember <email address hidden>

diff --git a/src/i830_video.c b/src/i830_video.c
index 3c6fbf3..3f3aaac 100644
--- a/src/i830_video.c
+++ b/src/i830_video.c
@@ -1048,11 +1048,14 @@ I830StopVideo(ScrnInfoPtr pScrn, pointer data, Bool shut
        if (pPriv->videoStatus & CLIENT_VIDEO_ON) {
            i830_overlay_off(pScrn);
        }
- if (!pPriv->textured)
- drm_intel_bo_unpin(pPriv->buf);
- drm_intel_bo_unreference(pPriv->buf);
- pPriv->buf = NULL;
- pPriv->videoStatus = 0;
+
+ if (pPriv->buf) {
+ if (!pPriv->textured)
+ drm_intel_bo_unpin(pPriv->buf);
+ drm_intel_bo_unreference(pPriv->buf);
+ pPriv->buf = NULL;
+ pPriv->videoStatus = 0;
+ }
     } else {
        if (pPriv->videoStatus & CLIENT_VIDEO_ON) {
            pPriv->videoStatus |= OFF_TIMER;

*** Bug 21025 has been marked as a duplicate of this bug. ***

Works for me but I had to change the top of the patch a little because one part is a little different.

Created an attachment (id=24609)
Patch for Ubuntu xserver-xorg-video-intel 2.6.3-ubuntu5

Great, thanks for confirming.

Yes, works for me too (with similarly-changed patch).

Thanks for fixing/pointing out the patch so fast :)