[Bug 17201] Kernel NULL pointer dereference in r600_ioctl_wait_idle

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=17201





--- Comment #7 from Duncan <1i5t5.duncan@cox.net>  2010-09-08 07:30:47 ---
[I filed #17702, the dup.]

There's apparently something else happening, too.  Because with the patch,
2.6.36-rc3 gets farther than it did before, X starts, but it consistently
freezes (hard kernel freeze, Magic-SRQ fails, hard-reset time) before I hit the
desktop, while without the patch, it soft-freezes (X has gobbled the keyboard
and VT-switching is dead, but I can Magic-SRQ-R, then C-A-Del to reboot) while
it's still black-screened, before the KDE splash.

Meanwhile, reverting the original commit
(4437579efca258e3c4a09f59838c8f933611990 as mentioned in bug #17702),
everything works fine, just as it did with earlier kernels.  So there's
obviously something still wrong with the code-path after the patch, or it
wouldn't be hard-freezing the kernel.

Also, as with the original bug after the commit, if I set disable dri in
xorg.conf.d, everything works, but of course without accelerated 3D.

Unfortunately, while I could get a log after the soft freeze, that's not
possible now, as it's a hard freeze.  But we know the commit that does it, and
the patch above does at least allow X to start; it just hard-kernel freezes
before it hits the full kde (4.5.0, I've not upgraded to 4.5.1 yet)
plasma-desktop.

So either this bug needs reopened, or I can reopen mine or file a new one.

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