[Bug 108495] New: [patch][crash] Xorg is crashing on startup in xinerama configuration

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108495

            Bug ID: 108495
           Summary: [patch][crash] Xorg is crashing on startup in xinerama
                    configuration
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: manio at skyboo.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hello
Xorg is crashing with the following backtrace:

[ 17793.950] (EE) Backtrace:
[ 17793.951] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x555656ef5de9]
[ 17793.952] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x50)
[0x7f5fbc02d92f]
[ 17793.952] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0x10b)
[0x7f5fbbe91f3b]
[ 17793.953] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x151)
[0x7f5fbbe932f1]
[ 17793.954] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (uselocale+0x33a)
[0x7f5fbbe8ac7a]
[ 17793.955] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (__assert_fail+0x42)
[0x7f5fbbe8ab02]
[ 17793.955] (EE) 6: /usr/lib/xorg/Xorg (RRClientKnowsRates+0x83)
[0x555656e55533]
[ 17793.955] (EE) 7: /usr/lib/xorg/Xorg (RRGetInfo+0x47f) [0x555656e55c5f]
[ 17793.956] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (_init+0x58a82)
[0x7f5fba736472]
[ 17793.956] (EE) 9: /usr/lib/xorg/Xorg (TimerSet+0x180) [0x555656eef660]
[ 17793.956] (EE) 10: /usr/lib/xorg/Xorg (TimerSet+0x1f8) [0x555656eef728]
[ 17793.956] (EE) 11: /usr/lib/xorg/Xorg (WaitForSomething+0x277)
[0x555656eef807]
[ 17793.956] (EE) 12: /usr/lib/xorg/Xorg (SendErrorToClient+0x10c)
[0x555656d9772c]
[ 17793.956] (EE) 13: /usr/lib/xorg/Xorg (InitFonts+0x3b6) [0x555656d9b906]
[ 17793.956] (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xe7)
[0x7f5fbbe7eb17]
[ 17793.956] (EE) 15: /usr/lib/xorg/Xorg (_start+0x2a) [0x555656d8567a]

Dual-card configuration (intel + nvidia).
This crash happens on xinerama when both cards are in use.
If only intel or only nvidia are used - no such problem.

I've tested it on modesetting and intel driver.
I've also tested on nouveau and proprietary nvidia driver.
In all above circumstances I have a crash when both cards are enabled.

I've prepared a patch which just disables a RandR calls in one place and it
helped! At least I have a working Xorg in awesome wm and did not notice any
side effects for several hours of testing.

Please review

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