Kernel oops while duming user core.

[Rune Torgersen]

Scott Wood wrote:
> Scott Wood wrote:
>> Nathan Lynch wrote:
>>> Is the crashing program multithreaded?  The first report had firefox
>>> triggering the oops.
>> 
>> OK, I've got a test program that triggers it now.  I'll see if I can
>> figure out what's going on.
> 
> The problem seems to be that update_mmu_cache() is called on a guard
> page with no access rights. 
> 
> Changing update_mmu_cache() to always call flush_dcache_icache_page()
> fixes it, though a better performing fix would probably be to add an
> exception table entry for the dcbst.

I can confirm that this seems to fix it.