On sparc64+ext4, suppress test failures from known WAL read failure.

Buildfarm members kittiwake, tadarida and snapper began to fail
frequently when commits 3cd9c3b921977272e6650a5efbeade4203c4bca2 and
f47ed79cc8a0cfa154dc7f01faaf59822552363f added tests of concurrency, but
the problem was reachable before those commits.  Back-patch to v10 (all
supported versions).

Discussion: https://postgr.es/m/20220116210241.GC756210@rfd.leadboat.com

diff --git a/src/bin/pgbench/t/023_cic_2pc.pl b/src/bin/pgbench/t/023_cic_2pc.pl
index e29c2564b77841f8d52b9df7d6d8f2213d05927a..707f28c34e85090950391c9a8648102884ad16fc 100644 (file)
--- a/src/bin/pgbench/t/023_cic_2pc.pl
+++ b/src/bin/pgbench/t/023_cic_2pc.pl
@@ -11,6 +11,8 @@ use TestLib;
 
 use Test::More tests => 6;
 
+local $TODO = 'filesystem bug' if TestLib::has_wal_read_bug;
+
 my ($node, $result);
 
 #

diff --git a/src/test/perl/TestLib.pm b/src/test/perl/TestLib.pm
index 1231c10fc3c70b2e35ff0f2169d80ecd6edf2611..0c561565e3b6fe96df4244766beb44df4b2836a4 100644 (file)
--- a/src/test/perl/TestLib.pm
+++ b/src/test/perl/TestLib.pm
@@ -223,6 +223,29 @@ sub real_dir
        return perl2host(@_);
 }
 
+=pod
+
+=item has_wal_read_bug()
+
+Returns true if $tmp_check is subject to a sparc64+ext4 bug that causes WAL
+readers to see zeros if another process simultaneously wrote the same offsets.
+Consult this in tests that fail frequently on affected configurations.  The
+bug has made streaming standbys fail to advance, reporting corrupt WAL.  It
+has made COMMIT PREPARED fail with "could not read two-phase state from WAL".
+Non-WAL PostgreSQL reads haven't been affected, likely because those readers
+and writers have buffering systems in common.  See
+https://postgr.es/m/20220116210241.GC756210@rfd.leadboat.com for details.
+
+=cut
+
+sub has_wal_read_bug
+{
+       return
+            $Config{osname} eq 'linux'
+         && $Config{archname} =~ /^sparc/
+         && !run_log([ qw(df -x ext4), $tmp_check ], '>', '/dev/null', '2>&1');
+}
+
 sub system_log
 {
        print("# Running: " . join(" ", @_) . "\n");