Messages in this thread |  | | | Date | Mon, 20 Jun 2005 14:48:51 +0100 (BST) | | From | Hugh Dickins <> | | Subject | Re: Linux-2.6.12 |
Gosh, I thought from the Subject that you'd taken over from Linus, and were announcing your new release ;)
On Mon, 20 Jun 2005, Richard B. Johnson wrote: > > Attempts to run a driver that worked up to 2.6.11.9 shows that > it aparently is no longer possible to nest calls to `down`. > In other words, a procedure that has taken a semaphore can't > then take another semaphore. > > down(&first_resource); > down(&second_resource); > ... > ... > up(&second_resource); > up(&first_resource); > > > The error is 'sleeping function called from invalid context....' > > ------------[ cut here ]------------ > kernel BUG at mm/memory.c:1112!
No, the error is "kernel BUG at mm/memory.c:1112!", which occurs while it's holding page table lock, from which it doesn't recover very well.
It's the BUG_ON(!pte_none(*pte)) in remap_pte_range. Maybe your page table is corrupt, maybe your driver is trying to remap_pfn_range on top of something already mapped.
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