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

Andrew Morton [off-list ref] wrote:

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    inet_bind()
    ->sk_dst_get
      ->read_lock(&sk->sk_dst_lock)

We are still holding the sock lock when doing sk_dst_get.

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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,
-- 
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