RE: Kernel oops while duming user core.

On Thu, 2008-01-31 at 16:10 -0600, Rune Torgersen wrote:

Scott Wood wrote:

quoted

Scott Wood wrote:

quoted

Nathan Lynch wrote:

quoted

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.

Might be better to avoid the flush when the page isn't readable ?

Ben.