netdev - Re: [PATCH 2/3] rhashtable-test: retry insert operations in threads

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Message-ID: <20150902070724.GD11564@pox.localdomain>
Date:	Wed, 2 Sep 2015 09:07:24 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, fengguang.wu@...el.com,
	wfg@...ux.intel.com, lkp@...org
Subject: Re: [PATCH 2/3] rhashtable-test: retry insert operations in threads

On 09/02/15 at 10:00am, Herbert Xu wrote:
> On Tue, Sep 01, 2015 at 04:51:24PM +0200, Thomas Graf wrote:
> >
> > 1. The current in-kernel self-test
> > 2. bind_netlink.c: https://github.com/tgraf/rhashtable
> 
> Thanks, I will try to reproduce this.

The path in question is:

int rhashtable_insert_rehash(struct rhashtable *ht)
{
	[...]

        old_tbl = rht_dereference_rcu(ht->tbl, ht);
        tbl = rhashtable_last_table(ht, old_tbl);

        size = tbl->size;

        if (rht_grow_above_75(ht, tbl))
                size *= 2;
        /* Do not schedule more than one rehash */
        else if (old_tbl != tbl)
                return -EBUSY;

The behaviour in question is the immediate rehash during
insertion which we want to fail.

Commits:
        ccd57b1bd32460d27bbb9c599e795628a3c66983
        a87b9ebf1709687ff213091d0fdb4254b1564803
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