Thor Lancelot Simon <tls%panix.com@localhost> writes: > On Mon, Mar 26, 2012 at 02:38:44PM -0400, Beverly Schwartz wrote: >> Here at BBN, we are getting a hang with heavy use of networking code >> and looking for possible deadlocks. We've made modifications to the >> kernel. I'm trying to understand the lock order invariants to make >> sure we have applied it correctly to our code. > > Generally speaking, I don't think we require locks to be released > in order - though of course it is good practice. I'd agree with that, but I think Bev is concerned about two locks A and B where the taking order is A then B and take A take B release A * take A and if someone else grabs A at *, then the other is waiting for B and we are waiting for B. So out of order releasing seems fine, but once starting to release I think you have to release all the way. But I am feeling a bit fuzzy on this.
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