[Bug 220444] x11-servers/xorg-server crashes on attempt to play a video using VDPAU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220444

--- Comment #2 from Mikhail Teterin <mi at FreeBSD.org> ---
Created attachment 184034
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=184034&action=edit
xorg.conf as requested

> What FreeBSD version/architecture?
FreeBSD-10.3-stable, amd64

> Which GPU?
The relevant part of Xorg.log is here:

[107685.614] (--) RADEON(0): Chipset: "ATI Radeon HD 5670" (ChipID = 0x68d8)
[107685.761] (II) RADEON(0): glamor detected, initialising EGL layer.
[107685.761] (II) RADEON(0): KMS Color Tiling: enabled
[107685.761] (II) RADEON(0): KMS Color Tiling 2D: enabled
[107685.761] (==) RADEON(0): TearFree property default: auto
[107685.761] (II) RADEON(0): KMS Pageflipping: enabled
[107685.763] (II) RADEON(0): Output DisplayPort-0 using monitor section
Monitor0
[107685.829] (II) RADEON(0): Output HDMI-0 has no monitor section
[107685.895] (II) RADEON(0): Output DVI-0 has no monitor section

> It seems you're using Mesa implementation of VDPAU.
Is there any other option for Radeon?

> Can you upload Xorg.?.log?
Attaching... I have not changed it in a while -- but never attempted VDPAU
before either.

> Can you bisect port updates to track down which one caused the regression?
No, this is my desktop -- can't have it "under maintenance" for that long :(
Besides, the x11 and graphics ports changed too much since the last time...

> Otherwise, provide a stacktrace after building everything, or at least
> mesa-* and xorg-server, with debugging symbols.
According to the stack I already have, the crash is in libgbm.so.1 -- installed
by mesa-libs. I'll rebuild _that_ WITH_DEBUG and try again. According to the
stack, it tries to execute a function at address 0x0 -- like something remains
simply uninitialized...

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