[Backport 17.06] service connectivity issue #1895
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When the gc_thresh3 value is reached kenel might remove existing neighbor entries. On an l3 miss try to reprogram the neighbor entry if the peer is valid. Its a best effort attempt because if the arp table is still at gc_thresh3 value, addition will fail. Signed-off-by: Santhosh Manohar <santhosh@docker.com> (cherry picked from commit 48f0c28)
Remove the need for the wait group and avoid new locks Added utility to print the method name and the caller name Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com> (cherry picked from commit 0a9aaf8)
Move the sandbox init logic into the go routine that handles peer operations. This is to avoid deadlocks in the use of the pMap.Lock for the network Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com> (cherry picked from commit 37502ac)
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conflicts were caused by missing commit |
mavenugo
approved these changes
Aug 5, 2017
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For better tracking : This PR brings back #1861 with the additional changes to avoid the deadlock. |
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First commit moves the peerAdd/peerDelete operation behind a channel
Second commit deals with a possible deadlock on the pMap Lock. Because of the lazy instantiation logic of the overlay driver, the initSandbox has in all cases to fetch peers from the DB. Moreover this operation has to be atomic on the whole table to avoid a race with subsequent peerAdd/peerDelete that can asynchronously come from the networkDB.
Backport of: #1893
This also include backport that was missing of: #1842