Would like to pin point that the I have just hit the very similar/exact
bug on 2.99 version of 14.04
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1383449
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** Branch linked: lp:ubuntu/raring-proposed/xserver-xorg-video-intel
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https://bugs.launchpad.net/bugs/1124576
Title:
Xorg crashed after feeding nbox=0 to trapezoid emit_boxes()
To
This bug was fixed in the package xserver-xorg-video-intel -
2:2.21.4-0ubuntu1
---
xserver-xorg-video-intel (2:2.21.4-0ubuntu1) raring; urgency=low
* Merge from unreleased debian git
- new upstream release (LP: #1124576, #1135403)
-- Timo Aaltonen tjaal...@ubuntu.com Mon, 11
* fingers crossed.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed = Fix Committed
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https://bugs.launchpad.net/bugs/1124576
Title:
Xorg crashed after feeding
** Tags added: crash
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https://bugs.launchpad.net/bugs/1124576
Title:
Xorg crashed after feeding nbox=0 to trapezoid emit_boxes()
To manage notifications about this bug go to:
** Summary changed:
- Xorg crashed with signal 7 in start_thread()
+ Xorg crashed after feeding nbox=0 to trapezoid emit_boxes()
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https://bugs.launchpad.net/bugs/1124576
Title:
Xorg
May I ask you to recompile -intel with --enable-debug? That will narrow
down were the nbox=0 crept in. Alternatively if you can narrow down the
reproduction steps, that would be fantastic.
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I think the issue will be:
diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
index 00518d4..d08d762 100644
--- a/src/sna/gen4_render.c
+++ b/src/sna/gen4_render.c
@@ -654,9 +654,12 @@ start:
goto flush;
}
- if (unlikely(sna-render.vertex_offset ==
This is the likely fix:
commit 56fd91fc830d7a210e3a0e70ab41261a1f5baa83
Author: Chris Wilson ch...@chris-wilson.co.uk
Date: Mon Feb 25 15:18:46 2013 +
sna/gen3+: Restart vertex space checks after lock contention
If we end up contending for the vertex lock, we need to double
@Chris,
For reproduce, I'm sorry that I can't really help much. It just happens in
general use. Often times its when I'm using firefox and scrolling. My browser
window is always on the second display (non-laptop display) and scrolling seems
to likely trigger it.
Sorry for being very
If my fix is the right one, then the bug will be a non-deterministic
race - so unlikely to be easily reproduced. The ppa:xorg-edgers should
carry the patch in the next day or so, if you can please test.
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