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    SubjectRe: null pointer dereference while loading i915
    On Wed, Aug 8, 2012 at 6:50 AM, Mihai Moldovan <> wrote:
    > Hi Daniel, hi list
    > ever since version 3.2.0 (maybe even earlier, but 3.0.2 is still working fine),
    > my box is crashing when loading the i915 driver (mode-setting enabled.)
    > The current version I'm testing with is 3.5.0.
    > I was able to get the BUG output (please forgive any errors/flips in the output,
    > I have had to transcribe the messages from the screen/images), however, I'm not
    > able to find out what's wrong.
    > If I see it correctly, there's a null pointer dereference in a printk called
    > from inside gmbus_xfer. The only printk calls I can see in
    > drivers/gpu/drm/i915/intel_i2c.c gmbus_xfer() however are issued by the
    > DRM_DEBUG_KMS() and DRM_INFO() macros.
    > Neither call looks wrong to me, I even tried to swap adapter->name with
    > bus-> and make *sure* i < num is true, but haven't had any success.
    > I'd really like to see this bug fixed, as it's preventing me from updating the
    > kernel for over a year now.
    > Also, while 3.0.2 works, it *does* spew error/warning messages related to gmbus
    > and I've had corrupted VTs in the past (albeit after a long uptime with multiple
    > X restarting and DVI cable unplugging/reattaching events), so maybe there's a
    > lot more broken than "expected".

    Hm, this is rather strange. gmbus should not be enable on 3.2 nor 3.0,
    since exactly this issue might happen. We've re-enabled gmbus again on
    3.5 after having fixed this bug. Are you sure that this is plain 3.2
    you're running?

    Yours, Daniel
    Daniel Vetter - +41 (0) 79 365 57 48 -

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