https://bugs.openldap.org/show_bug.cgi?id=9338
Issue ID: 9338
Summary: slapd write waiter doesn't resume pending ops
Product: OpenLDAP
Version: 2.5
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: ---
Component: slapd
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
If a socket output buffer fills up (e.g. because the client is not reading
responses fast enough) slapd will queue up any newly received operations on
that connection and defer their execution till later. In the new write waiter
code in master/2.5, after the socket becomes writable again the pending ops
are not getting rescheduled for execution because of a missing call to
connection_write(). As a result, a client waiting for these ops on that
connection to finish will be hung forever.
This bug impacts the syncrepl consumer in delta-sync mode if it loses sync and
has to fallback to Refresh mode, and its connection was backlogged on the
provider side. In the fallback case the consumer sends an Abandon for the
current search and issues a new Refresh search, but if the socket was blocked
on the provider side the new search won't execute.
A fix for the write waiter is ready, and also the consumer will be patched to
simply close the connection and open a new one on its fallback, to avoid
running into this problem.
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