netdev - Re: [PATCH 0/6 v2 net-next] rhashtable fixes

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Message-ID: <20150205101954.GA24388@casper.infradead.org>
Date:	Thu, 5 Feb 2015 10:19:54 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Ying Xue <ying.xue@...driver.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	herbert@...dor.apana.org.au
Subject: Re: [PATCH 0/6 v2 net-next] rhashtable fixes

On 02/05/15 at 05:14pm, Ying Xue wrote:
> On 02/05/2015 04:47 PM, Thomas Graf wrote:
> > On 02/05/15 at 10:32am, Ying Xue wrote:
> >> After I applied the sires, it sounds like panic doesn't occur any more. But soft
> >> lockup still happens although the frequency of its reproduction is much lower
> >> than before. Please take a look at its relevant log:
> > 
> > Thanks for testing and the report. I had run your bind_netlink test
> > overnight on a 4 CPU VM. Anything particular that might help trigger it?

Thanks. I will keep trying to reproduce. Can you try the following
patch in the meantime?

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 5919d63..1c65be2 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -593,7 +593,7 @@ void rhashtable_insert(struct rhashtable *ht, struct rhash_head *obj)
 
 	tbl = rht_dereference_rcu(ht->future_tbl, ht);
 	old_tbl = rht_dereference_rcu(ht->tbl, ht);
-	hash = head_hashfn(ht, tbl, obj);
+	hash = obj_raw_hashfn(ht, rht_obj(ht, obj));
 
 	lock_buckets(tbl, old_tbl, hash);
 	__rhashtable_insert(ht, obj, tbl, hash);
@@ -835,7 +835,7 @@ bool rhashtable_lookup_compare_insert(struct rhashtable *ht,
 	rcu_read_lock();
 	old_tbl = rht_dereference_rcu(ht->tbl, ht);
 	new_tbl = rht_dereference_rcu(ht->future_tbl, ht);
-	new_hash = head_hashfn(ht, new_tbl, obj);
+	new_hash = obj_raw_hashfn(ht, rht_obj(ht, obj));
 
 	lock_buckets(new_tbl, old_tbl, new_hash);
 

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