[Nouveau] [Bug 61765] New: Regression: null pointer dereference on reboot after switcheroo use

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61765

          Priority: medium
            Bug ID: 61765
          Assignee: nouveau at lists.freedesktop.org
           Summary: Regression: null pointer dereference on reboot after
                    switcheroo use
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: crrodriguez at opensuse.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 75867
  --> https://bugs.freedesktop.org/attachment.cgi?id=75867&action=edit
screenshot of the crash

echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

causes a null ptr deref at shurdown in this hybrid graphics laptop.

01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M]
(rev a1)

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)

It used to work fine in 3.6 , it broke at some point after 3.7 and continues to
be broken in 3.8 or in 3.9.

The attached file has a screen caputure of the crash.

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