[Bug 1554004] [NEW] Segfault on X startup with VX900

[Launchpad Bug Tracker]

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[Impact]

 * Prevents from using X at all with some VIA chipsets - a segfault
occurs and is logged in Xorg.log

[Test Case]

 * Start X on a affected hw (e.g. VX900).

 * Examine Xorg.log after crash.

[Regression Potential]

 * This is a bug fixed upstream
(https://cgit.freedesktop.org/openchrome/xf86-video-
openchrome/commit/?id=ecb1695ac2de1d840c036f64b5b71602e0f522a4).

 * The fix is a one-liner with minimal impact.

[Other Info]

 * Original bug description:

There is a segfault in Xorg.log visible when starting X on Trusty 14.04
with the following hardware:

00:01.0 VGA compatible controller [0300]: VIA Technologies, Inc. VX900 Graphics [Chrome9 HD] [1106:7122] (prog-if 00 [VGA controller])
        Subsystem: Gigabyte Technology Co., Ltd Device [1458:d000]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 64
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at fc000000 (32-bit, non-prefetchable) [size=16M]
        Region 2: Memory at f0000000 (32-bit, prefetchable) [size=128M]
        Expansion ROM at febf0000 [disabled] [size=64K]
        Capabilities: [60] Power Management version 2
                Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000

Snip of the Xorg.log:
[   549.260] (EE) Backtrace:
[   549.260] (EE) 0: /usr/bin/X (xorg_backtrace+0x4f) [0xb77551bf]
[   549.261] (EE) 1: /usr/bin/X (0xb75ac000+0x1acfa4) [0xb7758fa4]
[   549.261] (EE) 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb7589410]
[   549.261] (EE) 3: /usr/lib/xorg/modules/drivers/openchrome_drv.so (0xb6c84000+0x13ccc) [0xb6c97ccc]
[   549.261] (EE) 4: /usr/bin/X (InitOutput+0xb43) [0xb762f623]
[   549.261] (EE) 5: /usr/bin/X (0xb75ac000+0x410c7) [0xb75ed0c7]
[   549.262] (EE) 6: /usr/bin/X (0xb75ac000+0x2ae1e) [0xb75d6e1e]
[   549.262] (EE) 7: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb7197a83]
[   549.262] (EE) 8: /usr/bin/X (0xb75ac000+0x2ae54) [0xb75d6e54]
[   549.262] (EE)
[   549.262] (EE) Segmentation fault at address 0x0
[   549.262] (EE)
[   549.263] (EE) Caught signal 11 (Segmentation fault). Server aborting
[   549.263] (EE)
[   549.263] (EE)
[   549.263] (EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information.
[   549.263] (EE)
[   549.269] (EE) Server terminated with error (1). Closing log file.

** Affects: openchrome
     Importance: Medium
         Status: Confirmed

** Affects: xserver-xorg-video-openchrome (Ubuntu)
     Importance: Undecided
     Assignee: Dariusz Gadomski (dgadomski)
         Status: Confirmed


** Tags: patch
-- 
Segfault on X startup with VX900
https://bugs.launchpad.net/bugs/1554004
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