Loading ng_socket at runtime?
rwatson at FreeBSD.org
Thu Jul 30 09:39:00 UTC 2009
On Wed, 29 Jul 2009, Matthew Fleming wrote:
> I'm doing a migration from releng/6.1 to stable/7, and one of the many new
> things is that I get a warning when doing things with ng_socket that didn't
> used to happen.
> WARNING: attempt to net_add_domain(netgraph) after domainfinalize()
I've wondered about these warnings also, and am not sure they're justified --
any protocol loading after domainfinalize() should expect that timers are
already started, etc, and loadable protocols are clearly desirable.
> - ignore the warning (usually a bad idea...)
Probably remove the warning. Some more synchronization is likely required in
domain registration than is currently there -- on the other hand, it's
probably not a big issue that it's missing as write operations on the domain
list are conservative and extremely rare.
I've CC'd Max Laier, who added the warnings -- perhaps he could lend some
insight into the types of problems he anticipated. The main one I'm aware of
is that mutating the domain list on a live system is risky because it's not
well-synchronized -- however, adding domains should be pretty safe in
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