isolation test fails on installcheck

Hi,

I was running some tests, and noted $SUBJECT.
It fails consistently on current HEAD (without any patch).

Parameters i changed:

            name            |      setting
----------------------------+--------------------
 archive_command            | exit 0
 archive_mode                  | on
 effective_cache_size        | 262144
 hot_standby                    | on
 listen_addresses             | *
 log_timezone                  | America/Guayaquil
 logging_collector             | on
 max_wal_senders           | 10
 random_page_cost          | 2.5
 shared_buffers                 | 65536
 synchronous_commit       | off
 TimeZone                        | America/Guayaquil
 wal_keep_segments         | 100
 wal_level                         | hot_standby
 work_mem                      | 5120

Attached regressions.diff, basically the fails give an error of
"select failed: Interrupted system call"

I hope nobody says it's my machine's fault

--
Jaime Casanova         www.2ndQuadrant.com
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