[Bug 82835] [NV92] GeForce 8800 GS VDPAU h264 decoding hang

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=82835

--- Comment #6 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Hm, just noticed this (same as last time, but I guess I wasn't paying enough
attention):

nouveau E[  PGRAPH][0000:05:00.0] ch 4 [0x00178fb000 mplayer[1645]] subc 3
class 0x8297 mthd 0x1b0c data 0x1000f010
nouveau E[     PFB][0000:05:00.0] trapped write at 0x00204050c0 on channel
0x000178fb [mplayer[1645]] PGRAPH/PROP/RT0 reason: PAGE_NOT_PRESENT

method 1b0c == QUERY_GET. However the data is 0x1000f010, not 0xf010, which
means it's not coming from the video stuff or the screen fence stuff, but
rather is a PIPE_QUERY_GPU_FINISHED query. Which is interesting, because
nothing appears to actually use that PIPE_QUERY type...

Could you stick a assert(0) right before

      nv50_query_get(push, q, 0, 0x1000f010);

in nv50_query.c and see if it triggers (make sure to use a debug build... or
make it something nastier than assert), and get a backtrace from gdb? (Or
actually just set a breakpoint on that line and see if gdb hits it...)

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