Re: 2.6.17-mm3 -- BUG: illegal lock usage -- illegal {softirq-on-W} -> {in-softirq-R} usage.

[Herbert Xu <herbert@gondor.apana.org.au>]

Andrew Morton <akpm@osdl.org> wrote:
>
>> >     inet_bind()
>> >     ->sk_dst_get
>> >       ->read_lock(&sk->sk_dst_lock)

We are still holding the sock lock when doing sk_dst_get.

>> > > 1 lock held by java_vm/4418:
>> > >  #0:  (af_family_keys + (sk)->sk_family#4){-+..}, at: [<f93c9281>]
>> > > tcp_v6_rcv+0x308/0x7b7 [ipv6]
>> > 
>> >     softirq
>> >     ->ip6_dst_lookup
>> >       ->sk_dst_check
>> >         ->sk_dst_reset
>> >           ->write_lock(&sk->sk_dst_lock);

The sock lock prevents this path from being entered.  Instead the
received TCP packet is queued and replayed when the sock lock is
released.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
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