[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
>>
>> Can anyone help me out here?  This has been really disruptive to my
>> organization.  Unchecking "Use hardware acceleration when available"
>> in firefox also doesn't seem to fix it.  Anything else I could try?
>
> Launch firefox with LIBGL_ALWAYS_SOFTWARE=1 -- that should avoid using
> nouveau for any sort of 3d.
>
> Is this a new thing, or has it always been the case? If it's new, any
> idea what changed?

Thank you, I will try that ASAP.  I was trying to use the epiphany and
midori browsers for a long time but eventually had to give up and
switch to firefox and this problem popped up right away.

- Grant