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http://bugs.freedesktop.org/show_bug.cgi?id=23862.

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On 2009-09-11T05:40:40+00:00 Sven Arvidsson wrote:

Created an attachment (id=29412)
Viewport shading button

Pressing the "Viewport Shading" (see screenshot if it's not apparent
which one) button in Blender causes instant segfault. Works fine in
software mode.

I think this is a regression, so I might try a bisect when I have time.

#0  0x00000000 in ?? ()
No symbol table info available.
#1  0xb5d3638a in _swrast_ReadPixels (ctx=0x85, x=337, y=263, width=133, 
    height=136, format=6408, type=5121, packing=0x8ef01fc, pixels=0xa054400)
    at swrast/s_readpix.c:605
        clippedPacking = {Alignment = 4, RowLength = 133, SkipPixels = 0, 
          SkipRows = 0, ImageHeight = 0, SkipImages = 0, SwapBytes = 0 '\0', 
          LsbFirst = 0 '\0', ClientStorage = 0 '\0', Invert = 0 '\0', 
          BufferObj = 0x8eafd18}
#2  0xb5c116cf in intelReadPixels (ctx=0x8ee32d8, x=337, y=263, width=133, 
    height=136, format=6408, type=5121, pack=0x8ef01fc, pixels=0xa054400)
    at intel_pixel_read.c:314
        __func__ = "intelReadPixels"
#3  0xb5caff36 in _mesa_ReadPixels (x=337, y=263, width=133, height=136, 
    format=6408, type=5121, pixels=0xa054400) at main/readpix.c:208
        ctx = 0x8ee32d8

System environment:
-- chipset: G45 / ICH10R
-- system architecture: 32-bit
-- Linux distribution: Debian unstable
-- Machine or mobo model: Asus P5Q-EM
-- Display connector: DVI
-- KMS: enabled
-- xf86-video-intel: efbcf29dd1a1ca058b7a2a93f0685102c06c9369
-- xserver: 1.6.3
-- mesa: 7c0152fbaeb21ab423a9de339b85c54d1713432b
-- drm: 67e4172394a88d4922fb8d9c7c3d96ce7e02c5a6
-- kernel: 2.6.31-rc9

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/0

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On 2009-09-11T13:53:48+00:00 Wolfgang Kufner wrote:

This could be the same bug that I have observed and described in
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/427712 although here
it does really not matter much what button in blender I click or even
only mouse over.

Anyway, this regression appeared between commits 4d85a6b3 and 18882f4d.
file: libgl1-mesa-dri

I attach my gdb log of the crash.

please let me know if you need further information

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/8

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On 2009-09-11T13:54:58+00:00 Wolfgang Kufner wrote:

Created an attachment (id=29426)
blender crash on button push

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/9

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On 2009-09-11T14:02:15+00:00 Sven Arvidsson wrote:

(In reply to comment #1)
> This could be the same bug that I have observed and described in
> https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/427712 although here it
> does really not matter much what button in blender I click or even only mouse
> over. 

Doh! Indeed, almost any button will cause a segfault.

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/10

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On 2009-09-11T14:40:34+00:00 Sven Arvidsson wrote:

Bisecting leads to this:

36dd53a3cded9d003ec418732b7fc93c1476aa9b is first bad commit
commit 36dd53a3cded9d003ec418732b7fc93c1476aa9b
Author: Eric Anholt <eric@xxxxxxxxxx>
Date:   Thu Sep 10 09:26:38 2009 -0700

    intel: Don't forget to map the depth read buffer in spans.
    
    This broke BlitFramebufferEXT(GL_DEPTH_BUFFER_BIT).

:040000 040000 549d8f39d7717322b09dc656a5129f46162471f3
53fb80a11730f3ecfdf03231418e8dee0f7e984b M      src

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/11

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On 2009-09-13T13:35:59+00:00 Sven Arvidsson wrote:

Might be the same as bug 23871

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/19

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On 2009-09-14T20:18:49+00:00 Gordon Jin wrote:

Please retest with mesa master:

Branch: master
Commit: 8ec456c68cc69349c2506ce64047d06c7113780c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8ec456c68cc69349c2506ce64047d06c7113780c

Author: Brian Paul <brianp@xxxxxxxxxx>
Date:   Mon Sep 14 12:40:53 2009 -0600

intel: fix renderbuffer map/unmap regression

Commit 36dd53a3cded9d003ec418732b7fc93c1476aa9b caused a few regressions
because the glReadBuffer() buffer wasn't getting mapped when GL_READ_BUFFER
!= GL_DRAW_BUFFER.

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/20

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On 2009-09-14T22:46:01+00:00 Wolfgang Kufner wrote:

Yes, this bug is indeed fixed. :-)

I checked with fresh packages from ubuntu xorg-edgers ppa:
mesa (7.7.0~git20090914.d3f5a2e5-0ubuntu0tormod)
  * Checkout from git 20090914 (master branch) up to commit
    d3f5a2e5ab413ec0dab1efa8135705e5312d361d

Reply at: https://bugs.launchpad.net/mesa/+bug/427712/comments/21


** Changed in: mesa
   Importance: Unknown => Medium

-- 
[i965] xorg-edgers regression: blender-bin crashed with SIGSEGV in _swrast_ReadPixels()
https://bugs.launchpad.net/bugs/427712
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