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Alvaro Herrera 54eff5311d Fix deadlock hazard in CREATE INDEX CONCURRENTLY 
Multiple sessions doing CREATE INDEX CONCURRENTLY simultaneously are
supposed to be able to work in parallel, as evidenced by fixes in commit
c3d09b3bd2 specifically to support this case.  In reality, one of the
sessions would be aborted by a misterious "deadlock detected" error.

Jeff Janes diagnosed that this is because of leftover snapshots used for
system catalog scans -- this was broken by 8aa3e47510 keeping track of
(registering) the catalog snapshot.  To fix the deadlocks, it's enough
to de-register that snapshot prior to waiting.

Backpatch to 9.4, which introduced MVCC catalog scans.

Include an isolationtester spec that 8 out of 10 times reproduces the
deadlock with the unpatched code for me (Álvaro).

Author: Jeff Janes
Diagnosed-by: Jeff Janes
Reported-by: Jeremy Finzel
Discussion: https://postgr.es/m/CAMa1XUhHjCv8Qkx0WOr1Mpm_R4qxN26EibwCrj0Oor2YBUFUTg%40mail.gmail.com
2018-01-02 19:16:16 -03:00
..
authentication Avoid and detect SIGPIPE race in TAP tests. 2017-12-16 10:03:35 -08:00
examples Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
isolation Fix deadlock hazard in CREATE INDEX CONCURRENTLY 2018-01-02 19:16:16 -03:00
ldap Log diagnostic messages if errors occur during LDAP auth. 2017-10-12 22:37:14 -04:00
locale Add a temp-install prerequisite to "check"-like targets not having one. 2017-11-05 18:51:08 -08:00
mb Fix MB regression tests for WAL-logging of hash indexes. 2017-03-15 07:25:36 -04:00
modules Back out the session_start and session_end hooks feature. 2017-11-16 11:35:02 -05:00
perl Avoid putting build-location-dependent strings into generated files. 2017-12-21 10:57:06 -05:00
recovery In tests, await an LSN no later than the recovery target. 2017-12-31 21:58:29 -08:00
regress Improve regression tests' code coverage for plpgsql control structures. 2017-12-31 17:04:11 -05:00
ssl Add libpq connection parameter "scram_channel_binding" 2017-12-19 10:12:36 -05:00
subscription Don't reset additional columns on subscriber to NULL on UPDATE 2017-11-03 12:27:59 -04:00
thread Update typedefs.list and re-run pgindent 2017-11-29 09:24:24 -05:00
Makefile Add LDAP authentication test suite 2017-09-15 11:44:29 -04:00
README Add TAP tests for password-based authentication methods. 2017-03-17 11:34:16 +02:00

README 

PostgreSQL tests
================

This directory contains a variety of test infrastructure as well as some of the
tests in PostgreSQL. Not all tests are here -- in particular, there are more in
individual contrib/ modules and in src/bin.

Not all these tests get run by "make check". Check src/test/Makefile to see
which tests get run automatically.

authentication/
  Tests for authentication

examples/
  Demonstration programs for libpq that double as regression tests via
  "make check"

isolation/
  Tests for concurrent behavior at the SQL level

locale/
  Sanity checks for locale data, encodings, etc

mb/
  Tests for multibyte encoding (UTF-8) support

modules/
  Extensions used only or mainly for test purposes, generally not suitable
  for installing in production databases

perl/
  Infrastructure for Perl-based TAP tests

recovery/
  Test suite for recovery and replication

regress/
  PostgreSQL's main regression test suite, pg_regress

ssl/
  Tests to exercise and verify SSL certificate handling

subscription/
  Tests for logical replication

thread/
  A thread-safety-testing utility used by configure