Classic Server stops accepting new connections, while already active
ones continue to work regularly.

Load conditions seems irrilevant, we had a total of 4 events in less
than a week, two of these during very low load conditions and two in
average conditions.

Error in firebird.log (this is the last event this morning, load
conditions at 6 am are extremely low in our environment):

------------------------

sqlserver Thu May 3 06:17:56 2018
Database: /opt/firebird/security3.fdb
page 0, page type 1 lock denied (216)


sqlserver Thu May 3 06:17:57 2018
Database:
page 0, page type 1 lock denied (216)

------------------------

I've also noticed there are other errors in firebird.log, but these
seems not to be related to any connection problems (I've got no reports
from users). I put them here anyway:

------------------------

sqlserver Wed May 2 18:43:50 2018
Database: /opt/firebird/security3.fdb
page 377, page type 3 lock denied (216)


sqlserver Wed May 2 18:43:52 2018
Database: /opt/firebird/security3.fdb
page 377, page type 3 lock denied (216)


sqlserver Wed May 2 18:43:53 2018
Database: /opt/firebird/security3.fdb
page 377, page type 3 lock denied (216)

------------------------

This problem seems to be similar to this one:
http://tracker.firebirdsql.org/browse/CORE-5436 which however affects
Firebird on Windows.

This is a big problem for us, service is going down from time to time
and requires a server restart.

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