[Nouveau] [Bug 92438] Segfault in pushbuf_kref when running the android emulator (qemu) on nv50

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92438

--- Comment #12 from Ilia Mirkin <imirkin at alum.mit.edu> ---
[35345.800105] nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 6
[emulator-x86[1371]] get 0x00200f9878 put 0x00200f98d0 ib_get 0x000000ed ib_put
0x000000f6 state 0x80000000 (err: INVALID_CMD) push 0x00406040

This is a long-standing and utterly undiagnosed issue. Somehow an invalid
command manages to make it onto the pushbuf. [A command as in a FIFO command,
like "BEGIN_NV04" style, not like the actual data being fed to the engine.]

There has never been a reproducible way of triggering it. Only seems to happen
on tesla GPUs. Either something *very* subtle is going on in mesa, or we're
driving the hardware wrong, or... who knows.

Search around for 406040 -- tons of bugs open about this.

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