Re: x86-64 bad pmds in 2.6.11.6

[Dave Jones <davej@redhat.com>]

On Thu, Mar 31, 2005 at 12:41:17PM +0200, Andi Kleen wrote:
 > On Wed, Mar 30, 2005 at 04:44:55PM -0500, Dave Jones wrote:
 > > [apologies to Andi for getting this twice, I goofed the l-k address
 > >  the first time]
 > > 
 > >  
 > >  I arrived at the office today to find my workstation had this spew
 > >  in its dmesg buffer..
 > 
 > Looks like random memory corruption to me.
 > 
 > Can you enable slab debugging etc.?
 > 
 > >  mm/memory.c:97: bad pmd ffff81004b017438(00000038a5500a88).
 > >  mm/memory.c:97: bad pmd ffff81004b017440(0000000000000003).
 > >  mm/memory.c:97: bad pmd ffff81004b017448(00007ffffffff73b).
 > >  mm/memory.c:97: bad pmd ffff81004b017450(00007ffffffff73c).
 > > etc..

I realised today that this happens every time X starts up for
the first time.   I did some experiments, and found that with 2.6.12rc1
it's gone. Either it got fixed accidentally, or its hidden now
by one of the many changes in 4-level patches.

I'll try and narrow this down a little more tomorrow, to see if I
can pinpoint the exact -bk snapshot (may be tricky given they were
broken for a while), as it'd be good to get this fixed in 2.6.11.x
if .12 isn't going to show up any time soon.

		Dave