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SubjectRe: Process-shared futexes on hugepages puts the kernel in an infinite loop in 2.6.32.11; is this fixed now?
On Mon, Apr 19, 2010 at 05:45:05PM +0200, Peter Zijlstra wrote:
> Wouldn't a longer poison be more recognisable? Also, shouldn't this use
> POISON_POINTER_DELTA?
>
> Something like:
>
> #define HUGETBL_POISON ((void *) 0x00300300 + POISON_POINTER_DELTA)
>
> 0x2e5 isn't that high, I've had actual derefs in that range.

The default at kernel config time sets only 4k as unmapped (I think
it's a very bad default for 64bit archs), so above 4k userland can map
it and you can have actual derefs with 0x00300300 but not with Mel's
preferred <0x1000 address. So the address must be <0x1000.


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