On Sat, May 05 2018, Herbert Xu wrote:
> On Fri, May 04, 2018 at 01:54:14PM +1000, NeilBrown wrote:
>> If two threads run nested_table_alloc() at the same time
>> they could both allocate a new table.
>> Best case is that one of them will never be freed, leaking memory.
>> Worst case is hat entry get stored there before it leaks,
>> and the are lost from the table.
>>
>> So use cmpxchg to detect the race and free the unused table.
>>
>> Fixes: da20420f83ea ("rhashtable: Add nested tables")
>> Cc: sta...@vger.kernel.org # 4.11+
>> Signed-off-by: NeilBrown <ne...@suse.com>
>
> What about the spinlock that's meant to be held around this
> operation?The spinlock protects 2 or more buckets. The nested table contains at least 512 buckets, maybe more. It is quite possible for two insertions into 2 different buckets to both get their spinlock and both try to instantiate the same nested table. Thanks, NeilBrown
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