Messages in this thread | | | Subject | Re: bio linked list corruption. | From | Chris Mason <> | Date | Mon, 24 Oct 2016 18:02:35 -0400 |
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On 10/24/2016 05:50 PM, Linus Torvalds wrote: > On Mon, Oct 24, 2016 at 2:17 PM, Linus Torvalds > <torvalds@linux-foundation.org> wrote: >> >> The vmalloc/vfree code itself is a bit scary. In particular, we have a >> rather insane model of TLB flushing. We leave the virtual area on a >> lazy purge-list, and we delay flushing the TLB and actually freeing >> the virtual memory for it so that we can batch things up. > > Never mind. If DaveJ is running with DEBUG_PAGEALLOC, then the code in > vmap_debug_free_range() should have forced a synchronous TLB flush fro > vmalloc ranges too, so that doesn't explain it either. >
My big fear here is that we're just triggering an old stack corruption more reliably. I wonder if we can make it happen much faster by restricting the stacks to a static list and cycling through them in lifo fashion?
-chris
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