[Bug 90622] New: Segfault in xf86-video-intel-2.99.917 (sna) with gcc-5.1, linux-4.0 headers, linux-4.0 kernels

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90622

            Bug ID: 90622
           Summary: Segfault in xf86-video-intel-2.99.917 (sna) with
                    gcc-5.1, linux-4.0 headers, linux-4.0 kernels
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: zarniwhoop at ntlworld.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116015
  --> https://bugs.freedesktop.org/attachment.cgi?id=116015&action=edit
Xorg log after segfault

Summary: on x86_64 linuxfromscratch, with current released versions of
everything, if I use the default sna acceleration with a 4.0 kernel (tested
with 4.0.3 and 4.0.4) Xorg segfaults while trying to start. Oddly, if I build a
3.19.0 kernel (still using gcc-5) on the same sytem, it is fine.

With 4.0 kernels, if I enable uxa and force that in a conf file Xorg works
fine.

This is a SandyBridge running as x86_64 :
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 42
model name      : Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz
stepping        : 7

lspci says:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller])
        Subsystem: Gigabyte Technology Co., Ltd 2nd Generation Core Processor
Family Integrated Graphics Controller
        Flags: bus master, fast devsel, latency 0, IRQ 24
        Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915

Main package versions
xf86-video-intel-2.99.917
xorg-server-1.17.1
mesa-10.5.5
libdrm-2.4.61

This is using the VGA connector


Steps to reproduce: run 'startx'

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