On Fri, Jun 26, 2015 at 01:48:17PM +0300, Konstantin Khlebnikov wrote:
> Hash value passed as argument into rhashtable_lookup_compare could be
> computed using different hash table than rhashtable_lookup_compare sees.
>
> This patch passes key into rhashtable_lookup_compare() instead of hash and
> compures hash value right in place using the same table as for lookup.
>
> Also it adds comment for rhashtable_hashfn and rhashtable_obj_hashfn:
> user must prevent concurrent insert/remove otherwise returned hash value
> could be invalid.
>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
> Fixes: e341694e3eb5 ("netlink: Convert netlink_lookup() to use RCU protected hash table")
> Link: http://lkml.kernel.org/r/20150514042151.GA5482@xxxxxxxxxxxxxxxxxxx
> Cc: Stable <stable@xxxxxxxxxxxxxxx> (v3.17 .. v3.19)
This could indeed explain Eric's problems with those kernels. Eric,
can you rerun your test to see if this patch makes your problem go
away on the pre-4.0 kernels?
Thanks!
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
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