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><H1
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><A
NAME="RELEASE-9-6-11"
>E.12. Release 9.6.11</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2018-11-08</P
></DIV
><P
> This release contains a variety of fixes from 9.6.10.
For information about new features in the 9.6 major release, see
<A
HREF="release-9-6.html"
>Section E.23</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN133502"
>E.12.1. Migration to Version 9.6.11</A
></H2
><P
> A dump/restore is not required for those running 9.6.X.
</P
><P
> However, if you are upgrading from a version earlier than 9.6.9,
see <A
HREF="release-9-6-9.html"
>Section E.14</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN133507"
>E.12.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix corner-case failures
in <CODE
CLASS="FUNCTION"
>has_<TT
CLASS="REPLACEABLE"
><I
>foo</I
></TT
>_privilege()</CODE
>
family of functions (Tom Lane)
</P
><P
> Return NULL rather than throwing an error when an invalid object OID
is provided. Some of these functions got that right already, but not
all. <CODE
CLASS="FUNCTION"
>has_column_privilege()</CODE
> was additionally
capable of crashing on some platforms.
</P
></LI
><LI
><P
> Avoid O(N^2) slowdown in regular expression match/split functions on
long strings (Andrew Gierth)
</P
></LI
><LI
><P
> Fix parsing of standard multi-character operators that are immediately
followed by a comment or <TT
CLASS="LITERAL"
>+</TT
> or <TT
CLASS="LITERAL"
>-</TT
>
(Andrew Gierth)
</P
><P
> This oversight could lead to parse errors, or to incorrect assignment
of precedence.
</P
></LI
><LI
><P
> Avoid O(N^3) slowdown in lexer for long strings
of <TT
CLASS="LITERAL"
>+</TT
> or <TT
CLASS="LITERAL"
>-</TT
> characters
(Andrew Gierth)
</P
></LI
><LI
><P
> Fix mis-execution of SubPlans when the outer query is being scanned
backwards (Andrew Gierth)
</P
></LI
><LI
><P
> Fix failure of <TT
CLASS="COMMAND"
>UPDATE/DELETE ... WHERE CURRENT OF ...</TT
>
after rewinding the referenced cursor (Tom Lane)
</P
><P
> A cursor that scans multiple relations (particularly an inheritance
tree) could produce wrong behavior if rewound to an earlier relation.
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>EvalPlanQual</CODE
> to handle conditionally-executed
InitPlans properly (Andrew Gierth, Tom Lane)
</P
><P
> This resulted in hard-to-reproduce crashes or wrong answers in
concurrent updates, if they contained code such as an uncorrelated
sub-<TT
CLASS="LITERAL"
>SELECT</TT
> inside a <TT
CLASS="LITERAL"
>CASE</TT
>
construct.
</P
></LI
><LI
><P
> Fix character-class checks to not fail on Windows for Unicode
characters above U+FFFF (Tom Lane, Kenji Uno)
</P
><P
> This bug affected full-text-search operations, as well
as <TT
CLASS="FILENAME"
>contrib/ltree</TT
>
and <TT
CLASS="FILENAME"
>contrib/pg_trgm</TT
>.
</P
></LI
><LI
><P
> Disallow pushing sub-<TT
CLASS="LITERAL"
>SELECT</TT
>s containing window
functions, <TT
CLASS="LITERAL"
>LIMIT</TT
>, or <TT
CLASS="LITERAL"
>OFFSET</TT
> to
parallel workers (Amit Kapila)
</P
><P
> Such cases could result in inconsistent behavior due to different
workers getting different answers, as a result of indeterminacy
due to row-ordering variations.
</P
></LI
><LI
><P
> Ensure that sequences owned by a foreign table are processed
by <TT
CLASS="LITERAL"
>ALTER OWNER</TT
> on the table (Peter Eisentraut)
</P
><P
> The ownership change should propagate to such sequences as well, but
this was missed for foreign tables.
</P
></LI
><LI
><P
> Ensure that the server will process
already-received <TT
CLASS="LITERAL"
>NOTIFY</TT
>
and <TT
CLASS="LITERAL"
>SIGTERM</TT
> interrupts before waiting for client
input (Jeff Janes, Tom Lane)
</P
></LI
><LI
><P
> Fix over-allocation of space for <CODE
CLASS="FUNCTION"
>array_out()</CODE
>'s
result string (Keiichi Hirobe)
</P
></LI
><LI
><P
> Fix memory leak in repeated SP-GiST index scans (Tom Lane)
</P
><P
> This is only known to amount to anything significant in cases where
an exclusion constraint using SP-GiST receives many new index entries
in a single command.
</P
></LI
><LI
><P
> Ensure that <CODE
CLASS="FUNCTION"
>ApplyLogicalMappingFile()</CODE
> closes the
mapping file when done with it (Tomas Vondra)
</P
><P
> Previously, the file descriptor was leaked, eventually resulting in
failures during logical decoding.
</P
></LI
><LI
><P
> Fix logical decoding to handle cases where a mapped catalog table is
repeatedly rewritten, e.g., by <TT
CLASS="LITERAL"
>VACUUM FULL</TT
>
(Andres Freund)
</P
></LI
><LI
><P
> Prevent starting the server with <TT
CLASS="VARNAME"
>wal_level</TT
> set
to too low a value to support an existing replication slot (Andres
Freund)
</P
></LI
><LI
><P
> Avoid crash if a utility command causes infinite recursion (Tom Lane)
</P
></LI
><LI
><P
> When initializing a hot standby, cope with duplicate XIDs caused by
two-phase transactions on the master
(Michael Paquier, Konstantin Knizhnik)
</P
></LI
><LI
><P
> Fix event triggers to handle nested <TT
CLASS="COMMAND"
>ALTER TABLE</TT
>
commands (Michael Paquier, Álvaro Herrera)
</P
></LI
><LI
><P
> Propagate parent process's transaction and statement start timestamps
to parallel workers (Konstantin Knizhnik)
</P
><P
> This prevents misbehavior of functions such
as <CODE
CLASS="FUNCTION"
>transaction_timestamp()</CODE
> when executed in a
worker.
</P
></LI
><LI
><P
> Fix transfer of expanded datums to parallel workers so that alignment
is preserved, preventing crashes on alignment-picky platforms
(Tom Lane, Amit Kapila)
</P
></LI
><LI
><P
> Fix WAL file recycling logic to work correctly on standby servers
(Michael Paquier)
</P
><P
> Depending on the setting of <TT
CLASS="VARNAME"
>archive_mode</TT
>, a standby
might fail to remove some WAL files that could be removed.
</P
></LI
><LI
><P
> Fix handling of commit-timestamp tracking during recovery
(Masahiko Sawada, Michael Paquier)
</P
><P
> If commit timestamp tracking has been turned on or off, recovery might
fail due to trying to fetch the commit timestamp for a transaction
that did not record it.
</P
></LI
><LI
><P
> Randomize the <CODE
CLASS="FUNCTION"
>random()</CODE
> seed in bootstrap and
standalone backends, and in <SPAN
CLASS="APPLICATION"
>initdb</SPAN
>
(Noah Misch)
</P
><P
> The main practical effect of this change is that it avoids a scenario
where <SPAN
CLASS="APPLICATION"
>initdb</SPAN
> might mistakenly conclude that
POSIX shared memory is not available, due to name collisions caused by
always using the same random seed.
</P
></LI
><LI
><P
> Allow DSM allocation to be interrupted (Chris Travers)
</P
></LI
><LI
><P
> Avoid failure in a parallel worker when loading an extension that
tries to access system caches within its init function (Thomas Munro)
</P
><P
> We don't consider that to be good extension coding practice, but it
mostly worked before parallel query, so continue to support it for
now.
</P
></LI
><LI
><P
> Properly handle turning <TT
CLASS="VARNAME"
>full_page_writes</TT
> on
dynamically (Kyotaro Horiguchi)
</P
></LI
><LI
><P
> Fix possible crash due to double <CODE
CLASS="FUNCTION"
>free()</CODE
> during
SP-GiST rescan (Andrew Gierth)
</P
></LI
><LI
><P
> Avoid possible buffer overrun when replaying GIN page recompression
from WAL (Alexander Korotkov, Sivasubramanian Ramasubramanian)
</P
></LI
><LI
><P
> Fix missed fsync of a replication slot's directory (Konstantin
Knizhnik, Michael Paquier)
</P
></LI
><LI
><P
> Fix unexpected timeouts when
using <TT
CLASS="VARNAME"
>wal_sender_timeout</TT
> on a slow server
(Noah Misch)
</P
></LI
><LI
><P
> Ensure that hot standby processes use the correct WAL consistency
point (Alexander Kukushkin, Michael Paquier)
</P
><P
> This prevents possible misbehavior just after a standby server has
reached a consistent database state during WAL replay.
</P
></LI
><LI
><P
> Ensure background workers are stopped properly when the postmaster
receives a fast-shutdown request before completing database startup
(Alexander Kukushkin)
</P
></LI
><LI
><P
> Update the free space map during WAL replay of page all-visible/frozen
flag changes (Álvaro Herrera)
</P
><P
> Previously we were not careful about this, reasoning that the FSM is
not critical data anyway. However, if it's sufficiently out of date,
that can result in significant performance degradation after a standby
has been promoted to primary. The FSM will eventually be healed by
updates, but we'd like it to be good sooner, so work harder at
maintaining it during WAL replay.
</P
></LI
><LI
><P
> Avoid premature release of parallel-query resources when query end or
tuple count limit is reached (Amit Kapila)
</P
><P
> It's only okay to shut down the executor at this point if the caller
cannot demand backwards scan afterwards.
</P
></LI
><LI
><P
> Don't run atexit callbacks when servicing <TT
CLASS="LITERAL"
>SIGQUIT</TT
>
(Heikki Linnakangas)
</P
></LI
><LI
><P
> Don't record foreign-server user mappings as members of extensions
(Tom Lane)
</P
><P
> If <TT
CLASS="COMMAND"
>CREATE USER MAPPING</TT
> is executed in an extension
script, an extension dependency was created for the user mapping,
which is unexpected. Roles can't be extension members, so user
mappings shouldn't be either.
</P
></LI
><LI
><P
> Make syslogger more robust against failures in opening CSV log files
(Tom Lane)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>, as well as documentation
examples, to call <CODE
CLASS="FUNCTION"
>PQconsumeInput()</CODE
> before
each <CODE
CLASS="FUNCTION"
>PQnotifies()</CODE
> call (Tom Lane)
</P
><P
> This fixes cases in which <SPAN
CLASS="APPLICATION"
>psql</SPAN
> would not
report receipt of a <TT
CLASS="LITERAL"
>NOTIFY</TT
> message until after the
next command.
</P
></LI
><LI
><P
> Fix possible inconsistency in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>'s
sorting of dissimilar object names (Jacob Champion)
</P
></LI
><LI
><P
> Ensure that <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> will schema-qualify
the table name when
emitting <TT
CLASS="LITERAL"
>DISABLE</TT
>/<TT
CLASS="LITERAL"
>ENABLE TRIGGER</TT
>
commands (Tom Lane)
</P
><P
> This avoids failures due to the new policy of running restores with
restrictive search path.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to handle event triggers in
extensions correctly (Haribabu Kommi)
</P
><P
> <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> failed to preserve an event
trigger's extension-membership status.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>'s cluster state check to
work correctly on a standby server (Bruce Momjian)
</P
></LI
><LI
><P
> Enforce type <TT
CLASS="TYPE"
>cube</TT
>'s dimension limit in
all <TT
CLASS="FILENAME"
>contrib/cube</TT
> functions (Andrey Borodin)
</P
><P
> Previously, some cube-related functions could construct values that
would be rejected by <CODE
CLASS="FUNCTION"
>cube_in()</CODE
>, leading to
dump/reload failures.
</P
></LI
><LI
><P
> In <TT
CLASS="FILENAME"
>contrib/postgres_fdw</TT
>, don't try to ship a
variable-free <TT
CLASS="LITERAL"
>ORDER BY</TT
> clause to the remote server
(Andrew Gierth)
</P
></LI
><LI
><P
> Fix <TT
CLASS="FILENAME"
>contrib/unaccent</TT
>'s
<CODE
CLASS="FUNCTION"
>unaccent()</CODE
> function to use
the <TT
CLASS="LITERAL"
>unaccent</TT
> text search dictionary that is in the
same schema as the function (Tom Lane)
</P
><P
> Previously it tried to look up the dictionary using the search path,
which could fail if the search path has a restrictive value.
</P
></LI
><LI
><P
> Fix build problems on macOS 10.14 (Mojave) (Tom Lane)
</P
><P
> Adjust <SPAN
CLASS="APPLICATION"
>configure</SPAN
> to add
an <TT
CLASS="OPTION"
>-isysroot</TT
> switch to <TT
CLASS="VARNAME"
>CPPFLAGS</TT
>;
without this, PL/Perl and PL/Tcl fail to configure or build on macOS
10.14. The specific sysroot used can be overridden at configure time
or build time by setting the <TT
CLASS="VARNAME"
>PG_SYSROOT</TT
> variable in
the arguments of <SPAN
CLASS="APPLICATION"
>configure</SPAN
>
or <SPAN
CLASS="APPLICATION"
>make</SPAN
>.
</P
><P
> It is now recommended that Perl-related extensions
write <TT
CLASS="LITERAL"
>$(perl_includespec)</TT
> rather
than <TT
CLASS="LITERAL"
>-I$(perl_archlibexp)/CORE</TT
> in their compiler
flags. The latter continues to work on most platforms, but not recent
macOS.
</P
><P
> Also, it should no longer be necessary to
specify <TT
CLASS="OPTION"
>--with-tclconfig</TT
> manually to get PL/Tcl to
build on recent macOS releases.
</P
></LI
><LI
><P
> Fix MSVC build and regression-test scripts to work on recent Perl
versions (Andrew Dunstan)
</P
><P
> Perl no longer includes the current directory in its search path
by default; work around that.
</P
></LI
><LI
><P
> On Windows, allow the regression tests to be run by an Administrator
account (Andrew Dunstan)
</P
><P
> To do this safely, <SPAN
CLASS="APPLICATION"
>pg_regress</SPAN
> now gives up
any such privileges at startup.
</P
></LI
><LI
><P
> Allow btree comparison functions to return <TT
CLASS="LITERAL"
>INT_MIN</TT
>
(Tom Lane)
</P
><P
> Up to now, we've forbidden datatype-specific comparison functions from
returning <TT
CLASS="LITERAL"
>INT_MIN</TT
>, which allows callers to invert
the sort order just by negating the comparison result. However, this
was never safe for comparison functions that directly return the
result of <CODE
CLASS="FUNCTION"
>memcmp()</CODE
>, <CODE
CLASS="FUNCTION"
>strcmp()</CODE
>,
etc, as POSIX doesn't place any such restriction on those functions.
At least some recent versions of <CODE
CLASS="FUNCTION"
>memcmp()</CODE
> can
return <TT
CLASS="LITERAL"
>INT_MIN</TT
>, causing incorrect sort ordering.
Hence, we've removed this restriction. Callers must now use
the <TT
CLASS="LITERAL"
>INVERT_COMPARE_RESULT()</TT
> macro if they wish to
invert the sort order.
</P
></LI
><LI
><P
> Fix recursion hazard in shared-invalidation message processing
(Tom Lane)
</P
><P
> This error could, for example, result in failure to access a system
catalog or index that had just been processed by <TT
CLASS="COMMAND"
>VACUUM
FULL</TT
>.
</P
><P
> This change adds a new result code
for <CODE
CLASS="FUNCTION"
>LockAcquire</CODE
>, which might possibly affect
external callers of that function, though only very unusual usage
patterns would have an issue with it. The API
of <CODE
CLASS="FUNCTION"
>LockAcquireExtended</CODE
> is also changed.
</P
></LI
><LI
><P
> Save and restore SPI's global variables
during <CODE
CLASS="FUNCTION"
>SPI_connect()</CODE
>
and <CODE
CLASS="FUNCTION"
>SPI_finish()</CODE
> (Chapman Flack, Tom Lane)
</P
><P
> This prevents possible interference when one SPI-using function calls
another.
</P
></LI
><LI
><P
> Avoid using potentially-under-aligned page buffers (Tom Lane)
</P
><P
> Invent new union types <TT
CLASS="TYPE"
>PGAlignedBlock</TT
>
and <TT
CLASS="TYPE"
>PGAlignedXLogBlock</TT
>, and use these in place of plain
char arrays, ensuring that the compiler can't place the buffer at a
misaligned start address. This fixes potential core dumps on
alignment-picky platforms, and may improve performance even on
platforms that allow misalignment.
</P
></LI
><LI
><P
> Make <TT
CLASS="FILENAME"
>src/port/snprintf.c</TT
> follow the C99
standard's definition of <CODE
CLASS="FUNCTION"
>snprintf()</CODE
>'s result
value (Tom Lane)
</P
><P
> On platforms where this code is used (mostly Windows), its pre-C99
behavior could lead to failure to detect buffer overrun, if the
calling code assumed C99 semantics.
</P
></LI
><LI
><P
> When building on i386 with the <SPAN
CLASS="APPLICATION"
>clang</SPAN
>
compiler, require <TT
CLASS="OPTION"
>-msse2</TT
> to be used (Andres Freund)
</P
><P
> This avoids problems with missed floating point overflow checks.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>configure</SPAN
>'s detection of the result
type of <CODE
CLASS="FUNCTION"
>strerror_r()</CODE
> (Tom Lane)
</P
><P
> The previous coding got the wrong answer when building
with <SPAN
CLASS="APPLICATION"
>icc</SPAN
> on Linux (and perhaps in other
cases), leading to <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> not returning
useful error messages for system-reported errors.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
>
release 2018g for DST law changes in Chile, Fiji, Morocco, and Russia
(Volgograd), plus historical corrections for China, Hawaii, Japan,
Macau, and North Korea.
</P
></LI
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