[Nouveau] launching Firefox causes system crash

[Grant]

>> Launching firefox is causing a system crash with a black or white
>> screen and diagonal lines across it.  I've tried the latest nouveau
>> from git and the latest kernel.  I can't find anything in the logs
>> unfortunately.  Any ideas?
>>
>> 00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce
>> 6150SE nForce 430] (rev a2) (prog-if 00 [VGA controller])
>>     Subsystem: Micro-Star International Co., Ltd. Device 7309
>>     Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 40
>>     Memory at de000000 (32-bit, non-prefetchable) [size=16M]
>>     Memory at c0000000 (64-bit, prefetchable) [size=256M]
>>     Memory at dd000000 (64-bit, non-prefetchable) [size=16M]
>>     Expansion ROM at dfd40000 [disabled] [size=128K]
>>     Capabilities: [48] Power Management version 2
>>     Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
>>     Kernel driver in use: nouveau
>
> Someone just opened a bug about NV4E. You have NV4C, but one could
> imagine that there would be similarities. See
> https://bugs.freedesktop.org/show_bug.cgi?id=73445 and feel free to
> add yourself to it if that matches your symptoms (esp if it's a 3.13
> regression). Otherwise, more information would be nice. See
> http://nouveau.freedesktop.org/wiki/Bugs/ for the sort of information
> that's generally useful.

I should also mention that rebooting allows firefox to open.  It seems
to crash if it is opened after the system has been running for awhile.

I tried nouveau.config=NvMSI=0 but it didn't help.

- Grant