[Bug 55829] New: [Regression]Smokin-guns crash when change resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55829

          Priority: high
            Bug ID: 55829
          Assignee: dri-devel at lists.freedesktop.org
           Summary: [Regression]Smokin-guns crash when change resolution
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mengmeng.meng at intel.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: libdrm
           Product: DRI

System Environment:       
--------------------------
Platform: IVB,Piketon
Libdrm:    (master)libdrm-2.4.39-18-g844d75e5a0b3b8f3466a24256955e886275fb298
Mesa:    (master)87a34131c427b40a561cfef1513b446a0eeabc39
Xserver:(master)xorg-server-1.13.0-51-g4b7f00346daed20c96f3e8ea13ae411858a5424b
Xf86_video_intel:(master)2.20.9-47-gd73f5b5bb1a81421f1fdc3ac3b460a8ad90be0ad
Kernel:    (drm-intel-nightly) 4517f84e2981dddf4715997767c252a16579364b

Bug detailed description:
-----------------------------
Smokin-guns crash when change resolution on IVB and Piketon.
It's libdrm regression, the good commit is 2.4.31.

Reproduce steps:
----------------------------
1, xinit&
2, ./smokinguns.x86_64
3, change resolution(Settings/System/Video Mode)

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