From: Dave Jones <da...@codemonkey.org.uk>
Date: Tue, 22 Dec 2015 15:45:39 -0500
> ===============================
> [ INFO: suspicious RCU usage. ]
> 4.4.0-rc6-think+ #1 Not tainted
> -------------------------------
> lib/rhashtable.c:522 suspicious rcu_dereference_protected() usage!
>
> other info that might help us debug this:
>
>
> rcu_scheduler_active = 1, debug_locks = 0
> 2 locks held by trinity-c1/3652:
> #0: (&p->lock){+.+.+.}, at: [<ffffffff9a3335a7>] seq_read+0xd7/0x900
> #1: (&(&ht->lock)->rlock){+.+...}, at: [<ffffffff9a56f29d>]
> rhashtable_walk_init+0x9d/0x170
I'm so confused, the code reads:
spin_lock(&ht->lock);
iter->walker->tbl =
rcu_dereference_protected(ht->tbl, lockdep_is_held(&ht->lock));
?!?!?!
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