Re: sctp: hang in sctp_remaddr_seq_show

From: Eric Dumazet
Date: Mon Mar 18 2013 - 11:25:55 EST

On Mon, 2013-03-18 at 07:04 -0400, Neil Horman wrote:

> I'm not sure why the process would never get back to the schedule, but looking
> at the sctp_remaddr_seq_show function, I think that we should convert this
> sequence:
> sctp_local_bh_disable();
> read_lock(&head->lock);
> rcu_read_lock();
> to this:
> read_lock(&head->lock);
> rcu_read_lock_bh();
> Neil

I dont think so.

BH needs to be disabled before read_lock(&head->lock);

or else, write_lock() could deadlock (assuming it can be called from BH)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at