netdev - Re: [v2 PATCH 0/2] rhashtable: rhashtable with duplicate objects

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Message-ID: <1474277244.4469.21.camel@sipsolutions.net>
Date:   Mon, 19 Sep 2016 11:27:24 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org, Thomas Graf <tgraf@...g.ch>,
        tom@...bertland.com, Ben Greear <greearb@...delatech.com>
Subject: Re: [v2 PATCH 0/2] rhashtable: rhashtable with duplicate objects

> What does your test suite actually do? Is it something that I
> can run without special hardware?

Yes, it's pretty simple - it spins up a number of VMs with hwsim and
just runs a lot of tests:

https://w1.fi/cgit/hostap/tree/tests/hwsim

I've attached a kernel .config you can use for it.

I'm running 7 VMs (vm/parallel-vm.py 7), which makes it faster, but you
can probably reproduce the bug better with a single VM.

I have a feeling there's a bug with ht->nelems, since the crash is
always in the grow worker, but I haven't quite put my finger on it yet.

johannes
View attachment ".config" of type "text/x-mpsub" (61119 bytes)