[Bug 109230] New: [crash] Xorg is crashing on startup with enabled xinerama

[Bug 109230] New: [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

            Bug ID: 109230
           Summary: [crash] Xorg is crashing on startup with enabled
                    xinerama
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Dual gpu configuration: radeon + nouveau.
When xinerama is enabled xorg is crashing with the following backtrace:

[1208755.149] (EE) Backtrace:
[1208755.159] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x55b646b6afc9]
[1208755.160] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x50)
[0x7f7d21b486ff]
[1208755.162] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0x10b)
[0x7f7d219aa85b]
[1208755.163] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x121)
[0x7f7d21995535]
[1208755.164] (EE) unw_get_proc_name failed: no unwind info found [-10]
[1208755.164] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7f7d21995400]
[1208755.165] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (__assert_fail+0x42)
[0x7f7d219a30a2]
[1208755.166] (EE) 6: /usr/lib/xorg/modules/drivers/nouveau_drv.so
(_init+0x433b3) [0x7f7d1ff2e743]
[1208755.167] (EE) 7: /usr/lib/xorg/modules/drivers/nouveau_drv.so
(_init+0x4430a) [0x7f7d1ff304ea]
[1208755.168] (EE) 8: /usr/lib/xorg/modules/drivers/nouveau_drv.so
(_init+0x48b20) [0x7f7d1ff39480]
[1208755.169] (EE) 9: /usr/lib/xorg/modules/drivers/nouveau_drv.so
(_init+0x3b581) [0x7f7d1ff1ea81]
[1208755.175] (EE) 10: /usr/lib/xorg/Xorg (InitExtensions+0x63e)
[0x55b646a7affe]
[1208755.176] (EE) 11: /usr/lib/xorg/Xorg (InitFonts+0x279) [0x55b646a10839]
[1208755.178] (EE) 12: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xeb)
[0x7f7d2199709b]
[1208755.178] (EE) 13: /usr/lib/xorg/Xorg (_start+0x2a) [0x55b6469fa68a]

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

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #1 from Mariusz Białończyk <manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org> ---
Created attachment 142983
  --> https://bugs.freedesktop.org/attachment.cgi?id=142983&action=edit
full Xorg.log

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #2 from Mariusz Białończyk <manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org> ---
Created attachment 142984
  --> https://bugs.freedesktop.org/attachment.cgi?id=142984&action=edit
xorg.conf

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #3 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Looks like an assertion is failing in nouveau somewhere. I doubt it's related
to the intel SNA bug.

Do you have a debug symbols package you could install? Or perhaps build
xf86-video-nouveau yourself?

Also, to eliminate some potential complications -- try commenting out the
RADEON bit and ensure that it keeps failing. (Not that that shouldn't work, but
good to know for debugging purposes.)

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #4 from Mariusz Białończyk <manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org> ---
Hi Ilia,
> Do you have a debug symbols package you could install? Or perhaps build
> xf86-video-nouveau yourself?
yes - I installed it, but the line:
"unw_get_proc_name failed: no unwind info found"
was still there, so I compiled nouveau myself and installed with debug symbols
but it doesn't help to full unwind, so finally I compiled whole xorg+debug
symbols and complete unwind still doesn't happen.
Isn't it that this unwind is for some libc calls which is irrelevant?
I am attaching new backtrace from console output.

> Also, to eliminate some potential complications -- try commenting out the
> RADEON bit and ensure that it keeps failing. (Not that that shouldn't work,
> but good to know for debugging purposes.)
No, it is not failing with nouveau alone (and commented radeon driver).

I was also trying to disable xinerama (with radeon+nouveau) - then it is also
not failing. It seems this is triggering only with enabled xinerama and both
radeon and nouveau drivers loaded.

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #5 from Mariusz Białończyk <manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org> ---
Created attachment 142995
  --> https://bugs.freedesktop.org/attachment.cgi?id=142995&action=edit
startx - backtrace on console output

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #6 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
OK, that's helpful:

Xorg: /usr/include/xorg/privates.h:121: dixGetPrivateAddr: Assertion
`key->initialized' failed.

Can you stick a "return false" at the top of nouveau_sync_init and see if that
helps?

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #7 from Mariusz Białończyk <manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org> ---
Added this and it doesn't help. Can I somehow disable all RandR calls?

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

--- Comment #8 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
You could make drmmode_display.c:has_randr unconditionally return "false".

Getting a proper backtrace would be really nice though. Perhaps you can get it
in gdb? (Although it would be easiest to do that from a different machine over
ssh.)

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[Bug 109230] [crash] Xorg is crashing on startup with enabled xinerama

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https://bugs.freedesktop.org/show_bug.cgi?id=109230

Mariusz Białończyk <manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/nouveau              |Driver/Radeon
           Assignee|nouveau-PD4FTy7X32lNgt0PjOBp93rCq3LdnpKM@public.gmane.org |xorg-driver-ati-go0+a7rfsptAfugRpC6u6w@public.gmane.org
                   |rg                          |

--- Comment #9 from Mariusz Białończyk <manio-RFXG7K41k5GsTnJN9+BGXg@public.gmane.org> ---
I was able to collect proper backtrace with symbols. And it seems the problem
is the radeon.
I am attaching full backtrace.

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