[Nouveau] [Bug 69203] [NVC1] Kernel 3.11 - Xorg hangs immediately after invocation

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69203

--- Comment #10 from Alex <alupu01 at gmail.com> ---
UPDATES and CLARIFICATIONS (to whom it may concern)

1. The bug persists in 3.11.1 ("Latest Stable Kernel").


2. The Boot-up hang problem
Encountered in bisecting for the subject bug.
Certain commits hang up on boot.  Hard (you have to press the Chernobyl button
to restart the machine.)
Note: as a "side effect" of those occurrences, the subject X11 bug becomes
moot.
(I suspect some would consider this a _good_ side effect).

I pinpointed the offending commit by looking at the parents of c03ff9e8:

c03ff9e8fa5fc0186158b99a89f613325ff352cf        hangs on boot-up
30f4e0870d1726f31aa59804337cfd5e0a3f2ec7        hangs on boot-up
791dc143ed2c441f5202d8721609d94dce9fcf88        GOOD
 ...
a0376b1481fdb9c9e8064ea0c5af8bd80da3f8f3        GOOD
 ...
79442c3af0525e81d4598e272abe5db60c489c62        GOOD
 ...
99bd5537bd22256866d83033e0aab2586616bcc2        GOOD

------
So the boot-up hard HANG problem starts with

commit 30f4e0870d1726f31aa59804337cfd5e0a3f2e

Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Sun Jun 9 16:08:22 2013 +1000

    drm/nvc0-/gr: make register lists from initvals functions

    Generated context verified to be the same for all supported chipsets.

    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
---------------------------------------------------------

3.  To clear up the confusion I created by confusing dates with commit order,
ancestors and the like.
I performed a "manual" bisect procedure in the "lineage" of 8f6fe267 where
the subject bug is introduced (and where 5ee86c41 is indeed an ancestor of
56fbd2b65).

Legend
GOOD - Clean boot-up to text/console mode (level 3).  Clean X11/Xorg (level 5)
HANG - Hard hang on boot-up (to text/console mode).
FLAKY - Flaky X11 cursor:  after, say, starting xterm and exiting it, the
        cursor disappears and you have to restart the machine.
BAD - X11/Xorg is hung.  FWIW, cursor can still be moved with the left mouse.
      No other reaction.  The Subject BUG.

The parents of 8f6fe267:
8f6fe26745d39299d43d79dd7ba9838517624c3f        BAD
960b4381c5fff0b0f16f4b812082811dde1ab7ab        B
0085a60524aeb743c15bbdf7354f4e4f6623243e        B
18ac4246510bee85d2efd6ed536b436e246f7624        B
9d1c4c51ce9cd133a25b339be398e35663cc2ae5        B
b054aadfb0030b9717bb22f4283bfe5aec13440b        B
9ec2dbba9fedbd1788849fb00d659ebdf549a4f8        B
56fbd2b65446d4fb4df7770c49a70d563b7569c9        B
26410c679865bcfcbe18422ca1eb472cf12ea82d        B
a32b2ffb82b5a386a13fde40dc131f853636dcf5        B
70f824ac8c369194e9499c59e687c6aa8b1a10c8        FLAKY
5ee86c4190f9e19a9e13906389069c73d7f75bfb        HANG
c03ff9e8fa5fc0186158b99a89f613325ff352cf        H
30f4e0870d1726f31aa59804337cfd5e0a3f2ec7        H
791dc143ed2c441f5202d8721609d94dce9fcf88        GOOD
 ...

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