1. In heap_hot_search_buffer(), the PredicateLockTuple() call is passed
wrong offset number. heapTuple->t_self is set to the tid of the first
tuple in the chain that's visited, not the one actually being read.
2. CheckForSerializableConflictIn() uses the tuple's t_ctid field
instead of t_self to check for exiting predicate locks on the tuple. If
the tuple was updated, but the updater rolled back, t_ctid points to the
aborted dead tuple.
Kevin Grittner [Mon, 7 Oct 2013 19:15:24 +0000 (14:15 -0500)]
Eliminate xmin from hash tag for predicate locks on heap tuples.
If a tuple was frozen while its predicate locks mattered,
read-write dependencies could be missed, resulting in failure to
detect conflicts which could lead to anomalies in committed
serializable transactions.
This field was added to the tag when we still thought that it was
necessary to carry locks forward to a new version of an updated
row. That was later proven to be unnecessary, which allowed
simplification of the code, but elimination of xmin from the tag
was missed at the time.
Per report and analysis by Heikki Linnakangas.
Backpatch to 9.1.
Fix snapshot leak if lo_open called on non-existent object.
lo_open registers the currently active snapshot, and checks if the
large object exists after that. Normally, snapshots registered by lo_open
are unregistered at end of transaction when the lo descriptor is closed, but
if we error out before the lo descriptor is added to the list of open
descriptors, it is leaked. Fix by moving the snapshot registration to after
checking if the large object exists.
Reported by Pavel Stehule. Backpatch to 8.4. The snapshot registration
system was introduced in 8.4, so prior versions are not affected (and not
supported, anyway).
Andrew Dunstan [Sun, 29 Sep 2013 21:32:13 +0000 (17:32 -0400)]
Backpatch pgxs vpath build and installation fixes.
This is a backpatch of commits d942f9d9, 82b01026, and 6697aa2bc, back
to release 9.1 where we introduced extensions which make heavy use of
the PGXS infrastructure.
Fix spurious warning after vacuuming a page on a table with no indexes.
There is a rare race condition, when a transaction that inserted a tuple
aborts while vacuum is processing the page containing the inserted tuple.
Vacuum prunes the page first, which normally removes any dead tuples, but
if the inserting transaction aborts right after that, the loop after
pruning will see a dead tuple and remove it instead. That's OK, but if the
page is on a table with no indexes, and the page becomes completely empty
after removing the dead tuple (or tuples) on it, it will be immediately
marked as all-visible. That's OK, but the sanity check in vacuum would
throw a warning because it thinks that the page contains dead tuples and
was nevertheless marked as all-visible, even though it just vacuumed away
the dead tuples and so it doesn't actually contain any.
Spotted this while reading the code. It's difficult to hit the race
condition otherwise, but can be done by putting a breakpoint after the
heap_page_prune() call.
Backpatch all the way to 8.4, where this code first appeared.
B-tree operators are not allowed to leak memory into the current memory
context. Range_cmp leaked detoasted copies of the arguments. That caused
a quick out-of-memory error when creating an index on a range column.
Use @libdir@ in both of regress/{input,output}/security_label.source
Though @libdir@ almost always matches @abs_builddir@ in this context,
the test could only fail if they differed. Back-patch to 9.1, where the
test was introduced.
Stephen Frost [Mon, 23 Sep 2013 12:33:41 +0000 (08:33 -0400)]
Fix SSL deadlock risk in libpq
In libpq, we set up and pass to OpenSSL callback routines to handle
locking. When we run out of SSL connections, we try to clean things
up by de-registering the hooks. Unfortunately, we had a few calls
into the OpenSSL library after these hooks were de-registered during
SSL cleanup which lead to deadlocking. This moves the thread callback
cleanup to be after all SSL-cleanup related OpenSSL library calls.
I've been unable to reproduce the deadlock with this fix.
In passing, also move the close_SSL call to be after unlocking our
ssl_config mutex when in a failure state. While it looks pretty
unlikely to be an issue, it could have resulted in deadlocks if we
ended up in this code path due to something other than SSL_new
failing. Thanks to Heikki for pointing this out.
Back-patch to all supported versions; note that the close_SSL issue
only goes back to 9.0, so that hunk isn't included in the 8.4 patch.
Initially found and reported by Vesa-Matti J Kari; many thanks to
both Heikki and Andres for their help running down the specific
issue and reviewing the patch.
Once the administrator has called for an immediate shutdown or a backend
crash has triggered a reinitialization, no mere SIGINT or SIGTERM should
change that course. Such derailment remains possible when the signal
arrives before quickdie() blocks signals. That being a narrow race
affecting most PostgreSQL signal handlers in some way, leave it for
another patch. Back-patch this to all supported versions.
Tom Lane [Tue, 3 Sep 2013 22:32:26 +0000 (18:32 -0400)]
Don't fail for bad GUCs in CREATE FUNCTION with check_function_bodies off.
The previous coding attempted to activate all the GUC settings specified
in SET clauses, so that the function validator could operate in the GUC
environment expected by the function body. However, this is problematic
when restoring a dump, since the SET clauses might refer to database
objects that don't exist yet. We already have the parameter
check_function_bodies that's meant to prevent forward references in
function definitions from breaking dumps, so let's change CREATE FUNCTION
to not install the SET values if check_function_bodies is off.
Authors of function validators were already advised not to make any
"context sensitive" checks when check_function_bodies is off, if indeed
they're checking anything at all in that mode. But extend the
documentation to point out the GUC issue in particular.
(Note that we still check the SET clauses to some extent; the behavior
with !check_function_bodies is now approximately equivalent to what ALTER
DATABASE/ROLE have been doing for awhile with context-dependent GUCs.)
This problem can be demonstrated in all active branches, so back-patch
all the way.
Andrew Dunstan [Mon, 26 Aug 2013 18:56:49 +0000 (14:56 -0400)]
Unconditionally use the WSA equivalents of Socket error constants.
This change will only apply to mingw compilers, and has been found
necessary by late versions of the mingw-w64 compiler. It's the same as
what is done elsewhere for the Microsoft compilers.
Tom Lane [Sat, 24 Aug 2013 19:14:24 +0000 (15:14 -0400)]
Account better for planning cost when choosing whether to use custom plans.
The previous coding in plancache.c essentially used 10% of the estimated
runtime as its cost estimate for planning. This can be pretty bogus,
especially when the estimated runtime is very small, such as in a simple
expression plan created by plpgsql, or a simple INSERT ... VALUES.
While we don't have a really good handle on how planning time compares
to runtime, it seems reasonable to use an estimate based on the number of
relations referenced in the query, with a rather large multiplier. This
patch uses 1000 * cpu_operator_cost * (nrelations + 1), so that even a
trivial query will be charged 1000 * cpu_operator_cost for planning.
This should address the problem reported by Marc Cousin and others that
9.2 and up prefer custom plans in cases where the planning time greatly
exceeds what can be saved.
Magnus Hagander [Sat, 24 Aug 2013 15:11:31 +0000 (17:11 +0200)]
Don't crash when pg_xlog is empty and pg_basebackup -x is used
The backup will not work (without a logarchive, and that's the whole
point of -x) in this case, this patch just changes it to throw an
error instead of crashing when this happens.
Tom Lane [Fri, 23 Aug 2013 21:31:00 +0000 (17:31 -0400)]
In locate_grouping_columns(), don't expect an exact match of Var typmods.
It's possible that inlining of SQL functions (or perhaps other changes?)
has exposed typmod information not known at parse time. In such cases,
Vars generated by query_planner might have valid typmod values while the
original grouping columns only have typmod -1. This isn't a semantic
problem since the behavior of grouping only depends on type not typmod,
but it breaks locate_grouping_columns' use of tlist_member to locate the
matching entry in query_planner's result tlist.
We can fix this without an excessive amount of new code or complexity by
relying on the fact that locate_grouping_columns only gets called when
make_subplanTargetList has set need_tlist_eval == false, and that can only
happen if all the grouping columns are simple Vars. Therefore we only need
to search the sub_tlist for a matching Var, and we can reasonably define a
"match" as being a match of the Var identity fields
varno/varattno/varlevelsup. The code still Asserts that vartype matches,
but ignores vartypmod.
Per bug #8393 from Evan Martin. The added regression test case is
basically the same as his example. This has been broken for a very long
time, so back-patch to all supported branches.
Tom Lane [Sat, 3 Aug 2013 16:39:54 +0000 (12:39 -0400)]
Make sure float4in/float8in accept all standard spellings of "infinity".
The C99 and POSIX standards require strtod() to accept all these spellings
(case-insensitively): "inf", "+inf", "-inf", "infinity", "+infinity",
"-infinity". However, pre-C99 systems might accept only some or none of
these, and apparently Windows still doesn't accept "inf". To avoid
surprising cross-platform behavioral differences, manually check for each
of these spellings if strtod() fails. We were previously handling just
"infinity" and "-infinity" that way, but since C99 is most of the world
now, it seems likely that applications are expecting all these spellings
to work.
Per bug #8355 from Basil Peace. It turns out this fix won't actually
resolve his problem, because Python isn't being this careful; but that
doesn't mean we shouldn't be.
Alvaro Herrera [Fri, 2 Aug 2013 18:34:56 +0000 (14:34 -0400)]
Fix old visibility bug in HeapTupleSatisfiesDirty
If a tuple is locked but not updated by a concurrent transaction,
HeapTupleSatisfiesDirty would return that transaction's Xid in xmax,
causing callers to wait on it, when it is not necessary (in fact, if the
other transaction had used a multixact instead of a plain Xid to mark
the tuple, HeapTupleSatisfiesDirty would have behave differently and
*not* returned the Xmax).
This bug was introduced in commit 3f7fbf85dc5b42, dated December 1998,
so it's almost 15 years old now. However, it's hard to see this
misbehave, because before we had NOWAIT the only consequence of this is
that transactions would wait for slightly more time than necessary; so
it's not surprising that this hasn't been reported yet.
Stephen Frost [Thu, 1 Aug 2013 19:42:07 +0000 (15:42 -0400)]
Improve handling of pthread_mutex_lock error case
We should really be reporting a useful error along with returning
a valid return code if pthread_mutex_lock() throws an error for
some reason. Add that and back-patch to 9.0 as the prior patch.
Stephen Frost [Thu, 1 Aug 2013 05:15:45 +0000 (01:15 -0400)]
Add locking around SSL_context usage in libpq
I've been working with Nick Phillips on an issue he ran into when
trying to use threads with SSL client certificates. As it turns out,
the call in initialize_SSL() to SSL_CTX_use_certificate_chain_file()
will modify our SSL_context without any protection from other threads
also calling that function or being at some other point and trying to
read from SSL_context.
To protect against this, I've written up the attached (based on an
initial patch from Nick and much subsequent discussion) which puts
locks around SSL_CTX_use_certificate_chain_file() and all of the other
users of SSL_context which weren't already protected.
Nick Phillips, much reworked by Stephen Frost
Back-patch to 9.0 where we started loading the cert directly instead of
using a callback.
Tom Lane [Wed, 31 Jul 2013 15:31:30 +0000 (11:31 -0400)]
Fix regexp_matches() handling of zero-length matches.
We'd find the same match twice if it was of zero length and not immediately
adjacent to the previous match. replace_text_regexp() got similar cases
right, so adjust this search logic to match that. Note that even though
the regexp_split_to_xxx() functions share this code, they did not display
equivalent misbehavior, because the second match would be considered
degenerate and ignored.
Currently we don't need to update the pg_tablespace catalog
after redefining the symbolic links to the tablespaces
because pg_tablespace.spclocation column was removed in
PostgreSQL 9.2.
Back patch to 9.2 where pg_tablespace.spclocation was removed.
Refactoring as part of commit 8ceb24568054232696dddc1166a8563bc78c900a
had the unintended effect of making REINDEX TABLE and REINDEX DATABASE
no longer validate constraints enforced by the indexes in question;
REINDEX INDEX still did so. Indexes marked invalid remained so, and
constraint violations arising from data corruption went undetected.
Back-patch to 9.0, like the causative commit.
Tom Lane [Mon, 29 Jul 2013 14:42:44 +0000 (10:42 -0400)]
Fix contrib/cube and contrib/seg to build with bison 3.0.
These modules used the YYPARSE_PARAM macro, which has been deprecated
by the bison folk since 1.875, and which they finally removed in 3.0.
Adjust the code to use the replacement facility, %parse-param, which
is a much better solution anyway since it allows specification of the
type of the extra parser parameter. We can thus get rid of a lot of
unsightly casting.
Back-patch to all active branches, since somebody might try to build
a back branch with up-to-date tools.
Tom Lane [Thu, 25 Jul 2013 15:39:15 +0000 (11:39 -0400)]
Fix configure probe for sys/ucred.h.
The configure script's test for <sys/ucred.h> did not work on OpenBSD,
because on that platform <sys/param.h> has to be included first.
As a result, socket peer authentication was disabled on that platform.
Problem introduced in commit be4585b1c27ac5dbdd0d61740d18f7ad9a00e268.
Tom Lane [Wed, 24 Jul 2013 04:44:09 +0000 (00:44 -0400)]
Fix booltestsel() for case where we have NULL stats but not MCV stats.
In a boolean column that contains mostly nulls, ANALYZE might not find
enough non-null values to populate the most-common-values stats,
but it would still create a pg_statistic entry with stanullfrac set.
The logic in booltestsel() for this situation did the wrong thing for
"col IS NOT TRUE" and "col IS NOT FALSE" tests, forgetting that null
values would satisfy these tests (so that the true selectivity would
be close to one, not close to zero). Per bug #8274.
Fix by Andrew Gierth, some comment-smithing by me.
Tom Lane [Tue, 23 Jul 2013 20:23:08 +0000 (16:23 -0400)]
Change post-rewriter representation of dropped columns in joinaliasvars.
It's possible to drop a column from an input table of a JOIN clause in a
view, if that column is nowhere actually referenced in the view. But it
will still be there in the JOIN clause's joinaliasvars list. We used to
replace such entries with NULL Const nodes, which is handy for generation
of RowExpr expansion of a whole-row reference to the view. The trouble
with that is that it can't be distinguished from the situation after
subquery pull-up of a constant subquery output expression below the JOIN.
Instead, replace such joinaliasvars with null pointers (empty expression
trees), which can't be confused with pulled-up expressions. expandRTE()
still emits the old convention, though, for convenience of RowExpr
generation and to reduce the risk of breaking extension code.
In HEAD and 9.3, this patch also fixes a problem with some new code in
ruleutils.c that was failing to cope with implicitly-casted joinaliasvars
entries, as per recent report from Feike Steenbergen. That oversight was
because of an inadequate description of the data structure in parsenodes.h,
which I've now corrected. There were some pre-existing oversights of the
same ilk elsewhere, which I believe are now all fixed.
Tom Lane [Sat, 20 Jul 2013 16:44:37 +0000 (12:44 -0400)]
Fix error handling in PLy_spi_execute_fetch_result().
If an error is thrown out of the datatype I/O functions called by this
function, we need to do subtransaction cleanup, which the previous coding
entirely failed to do. Fortunately, both existing callers of this function
already have proper cleanup logic, so re-throwing the exception is enough.
Also, postpone creation of the resultset tupdesc until after the I/O
conversions are complete, so that we won't leak memory in TopMemoryContext
when such an error happens.
Tom Lane [Fri, 19 Jul 2013 01:22:47 +0000 (21:22 -0400)]
Fix regex match failures for backrefs combined with non-greedy quantifiers.
An ancient logic error in cfindloop() could cause the regex engine to fail
to find matches that begin later than the start of the string. This
function is only used when the regex pattern contains a back reference,
and so far as we can tell the error is only reachable if the pattern is
non-greedy (i.e. its first quantifier uses the ? modifier). Furthermore,
the actual match must begin after some potential match that satisfies the
DFA but then fails the back-reference's match test.
Reported and fixed by Jeevan Chalke, with cosmetic adjustments by me.
Stephen Frost [Mon, 15 Jul 2013 14:42:27 +0000 (10:42 -0400)]
Correct off-by-one when reading from pipe
In pg_basebackup.c:reached_end_position(), we're reading from an
internal pipe with our own background process but we're possibly
reading more bytes than will actually fit into our buffer due to
an off-by-one error. As we're reading from an internal pipe
there's no real risk here, but it's good form to not depend on
such convenient arrangements.
Stephen Frost [Sun, 14 Jul 2013 20:43:23 +0000 (16:43 -0400)]
Ensure 64bit arithmetic when calculating tapeSpace
In tuplesort.c:inittapes(), we calculate tapeSpace by first figuring
out how many 'tapes' we can use (maxTapes) and then multiplying the
result by the tape buffer overhead for each. Unfortunately, when
we are on a system with an 8-byte long, we allow work_mem to be
larger than 2GB and that allows maxTapes to be large enough that the
32bit arithmetic can overflow when multiplied against the buffer
overhead.
When this overflow happens, we end up adding the overflow to the
amount of space available, causing the amount of memory allocated to
be larger than work_mem.
Note that to reach this point, you have to set work mem to at least
24GB and be sorting a set which is at least that size. Given that a
user who can set work_mem to 24GB could also set it even higher, if
they were looking to run the system out of memory, this isn't
considered a security issue.
This overflow risk was found by the Coverity scanner.
Back-patch to all supported branches, as this issue has existed
since before 8.4.
Bruce Momjian [Thu, 11 Jul 2013 13:43:17 +0000 (09:43 -0400)]
pg_upgrade: document possible pg_hba.conf options
Previously, pg_upgrade docs recommended using .pgpass if using MD5
authentication to avoid being prompted for a password. Turns out pg_ctl
never prompts for a password, so MD5 requires .pgpass --- document that.
Also recommend 'peer' for authentication too.
Backpatch back to 9.1.
Tom Lane [Mon, 8 Jul 2013 02:37:32 +0000 (22:37 -0400)]
Fix planning of parameterized appendrel paths with expensive join quals.
The code in set_append_rel_pathlist() for building parameterized paths
for append relations (inheritance and UNION ALL combinations) supposed
that the cheapest regular path for a child relation would still be cheapest
when reparameterized. Which might not be the case, particularly if the
added join conditions are expensive to compute, as in a recent example from
Jeff Janes. Fix it to compare child path costs *after* reparameterizing.
We can short-circuit that if the cheapest pre-existing path is already
parameterized correctly, which seems likely to be true often enough to be
worth checking for.
Back-patch to 9.2 where parameterized paths were introduced.
Silence compiler warning in assertion-enabled builds.
With -Wtype-limits, gcc correctly points out that size_t can never be < 0.
Backpatch to 9.3 and 9.2. It's been like this forever, but in <= 9.1 you got
a lot other warnings with -Wtype-limits anyway (at least with my version of
gcc).
Tom Lane [Thu, 27 Jun 2013 17:54:59 +0000 (13:54 -0400)]
Mark index-constraint comments with correct dependency in pg_dump.
When there's a comment on an index that was created with UNIQUE or PRIMARY
KEY constraint syntax, we need to label the comment as depending on the
constraint not the index, since only the constraint object actually appears
in the dump. This incorrect dependency can lead to parallel pg_restore
trying to restore the comment before the index has been created, per bug
#8257 from Lloyd Albin.
This patch fixes pg_dump to produce the right dependency in dumps made
in the future. Usually we also try to hack pg_restore to work around
bogus dependencies, so that existing (wrong) dumps can still be restored in
parallel mode; but that doesn't seem practical here since there's no easy
way to relate the constraint dump entry to the comment after the fact.
Tom Lane [Thu, 27 Jun 2013 16:36:44 +0000 (12:36 -0400)]
Expect EWOULDBLOCK from a non-blocking connect() call only on Windows.
On Unix-ish platforms, EWOULDBLOCK may be the same as EAGAIN, which is
*not* a success return, at least not on Linux. We need to treat it as a
failure to avoid giving a misleading error message. Per the Single Unix
Spec, only EINPROGRESS and EINTR returns indicate that the connection
attempt is in progress.
On Windows, on the other hand, EWOULDBLOCK (WSAEWOULDBLOCK) is the expected
case. We must accept EINPROGRESS as well because Cygwin will return that,
and it doesn't seem worth distinguishing Cygwin from native Windows here.
It's not very clear whether EINTR can occur on Windows, but let's leave
that part of the logic alone in the absence of concrete trouble reports.
Also, remove the test for errno == 0, effectively reverting commit da9501bddb42222dc33c031b1db6ce2133bcee7b, which AFAICS was just a thinko;
or at best it might have been a workaround for a platform-specific bug,
which we can hope is gone now thirteen years later. In any case, since
libpq makes no effort to reset errno to zero before calling connect(),
it seems unlikely that that test has ever reliably done anything useful.
Tom Lane [Thu, 27 Jun 2013 04:23:37 +0000 (00:23 -0400)]
Tweak wording in sequence-function docs to avoid PDF build failures.
Adjust the wording in the first para of "Sequence Manipulation Functions"
so that neither of the link phrases in it break across line boundaries,
in either A4- or US-page-size PDF output. This fixes a reported build
failure for the 9.3beta2 A4 PDF docs, and future-proofs this particular
para against causing similar problems in future. (Perhaps somebody will
fix this issue in the SGML/TeX documentation tool chain someday, but I'm
not holding my breath.)
Back-patch to all supported branches, since the same problem could rise up
to bite us in future updates if anyone changes anything earlier than this
in func.sgml.
Andrew Dunstan [Tue, 25 Jun 2013 17:45:03 +0000 (13:45 -0400)]
Properly dump dropped foreign table cols in binary-upgrade mode.
In binary upgrade mode, we need to recreate and then drop dropped
columns so that all the columns get the right attribute number. This is
true for foreign tables as well as for native tables. For foreign
tables we have been getting the first part right but not the second,
leading to bogus columns in the upgraded database. Fix this all the way
back to 9.1, where foreign tables were introduced.
Fujii Masao [Tue, 25 Jun 2013 17:19:26 +0000 (02:19 +0900)]
Support clean switchover.
In replication, when we shutdown the master, walsender tries to send
all the outstanding WAL records to the standby, and then to exit. This
basically means that all the WAL records are fully synced between
two servers after the clean shutdown of the master. So, after
promoting the standby to new master, we can restart the stopped
master as new standby without the need for a fresh backup from
new master.
But there was one problem so far: though walsender tries to send all
the outstanding WAL records, it doesn't wait for them to be replicated
to the standby. Then, before receiving all the WAL records,
walreceiver can detect the closure of connection and exit. We cannot
guarantee that there is no missing WAL in the standby after clean
shutdown of the master. In this case, backup from new master is
required when restarting the stopped master as new standby.
This patch fixes this problem. It just changes walsender so that it
waits for all the outstanding WAL records to be replicated to the
standby before closing the replication connection.
Per discussion, this is a fix that needs to get backpatched rather than
new feature. So, back-patch to 9.1 where enough infrastructure for
this exists.
Kevin Grittner [Wed, 19 Jun 2013 15:37:57 +0000 (10:37 -0500)]
Fix the create_index regression test for Danish collation.
In Danish collations, there are letter combinations which sort
higher than 'Z'. A test for values > 'WA' was picking up rows
where the value started with 'AA', causing the test to fail.
Backpatch to 9.2, where the failing test was added.
Per report from Svenne Krap and analysis by Jeff Janes
Tom Lane [Fri, 14 Jun 2013 18:26:50 +0000 (14:26 -0400)]
Avoid deadlocks during insertion into SP-GiST indexes.
SP-GiST's original scheme for avoiding deadlocks during concurrent index
insertions doesn't work, as per report from Hailong Li, and there isn't any
evident way to make it work completely. We could possibly lock individual
inner tuples instead of their whole pages, but preliminary experimentation
suggests that the performance penalty would be huge. Instead, if we fail
to get a buffer lock while descending the tree, just restart the tree
descent altogether. We keep the old tuple positioning rules, though, in
hopes of reducing the number of cases where this can happen.
Tom Lane [Thu, 13 Jun 2013 17:11:35 +0000 (13:11 -0400)]
Only install a portal's ResourceOwner if it actually has one.
In most scenarios a portal without a ResourceOwner is dead and not subject
to any further execution, but a portal for a cursor WITH HOLD remains in
existence with no ResourceOwner after the creating transaction is over.
In this situation, if we attempt to "execute" the portal directly to fetch
data from it, we were setting CurrentResourceOwner to NULL, leading to a
segfault if the datatype output code did anything that required a resource
owner (such as trying to fetch system catalog entries that weren't already
cached). The case appears to be impossible to provoke with stock libpq,
but psqlODBC at least is able to cause it when working with held cursors.
Simplest fix is to just skip the assignment to CurrentResourceOwner, so
that any resources used by the data output operations will be managed by
the transaction-level resource owner instead. For consistency I changed
all the places that install a portal's resowner as current, even though
some of them are probably not reachable with a held cursor's portal.
Per report from Joshua Berry (with thanks to Hiroshi Inoue for developing
a self-contained test case). Back-patch to all supported versions.
Tom Lane [Tue, 11 Jun 2013 21:26:48 +0000 (17:26 -0400)]
Fix cache flush hazard in cache_record_field_properties().
We need to increment the refcount on the composite type's cached tuple
descriptor while we do lookups of its column types. Otherwise a cache
flush could occur and release the tuple descriptor before we're done with
it. This fails reliably with -DCLOBBER_CACHE_ALWAYS, but the odds of a
failure in a production build seem rather low (since the pfree'd descriptor
typically wouldn't get scribbled on immediately). That may explain the
lack of any previous reports. Buildfarm issue noted by Christian Ullrich.
Joe Conway [Mon, 10 Jun 2013 00:31:26 +0000 (17:31 -0700)]
Fix ordering of obj id for Rules and EventTriggers in pg_dump.
getSchemaData() must identify extension member objects and mark them
as not to be dumped. This must happen after reading all objects that can be
direct members of extensions, but before we begin to process table subsidiary
objects. Both rules and event triggers were wrong in this regard.
Backport rules portion of patch to 9.1 -- event triggers do not exist prior to 9.3.
Suggested fix by Tom Lane, initial complaint and patch by me.
Tom Lane [Sun, 9 Jun 2013 22:39:27 +0000 (18:39 -0400)]
Remove unnecessary restrictions about RowExprs in transformAExprIn().
When the existing code here was written, it made sense to special-case
RowExprs because that was the only way that we could handle row comparisons
at all. Now that we have record_eq() and arrays of composites, the generic
logic for "scalar" types will in fact work on RowExprs too, so there's no
reason to throw error for combinations of RowExprs and other ways of
forming composite values, nor to ignore the possibility of using a
ScalarArrayOpExpr. But keep using the old logic when comparing two
RowExprs, for consistency with the main transformAExprOp() logic. (This
allows some cases with not-quite-identical rowtypes to succeed, so we might
get push-back if we removed it.) Per bug #8198 from Rafal Rzepecki.
Back-patch to all supported branches, since this works fine as far back as
8.4.
Tom Lane [Sun, 9 Jun 2013 19:26:48 +0000 (15:26 -0400)]
Remove ALTER DEFAULT PRIVILEGES' requirement of schema CREATE permissions.
Per discussion, this restriction isn't needed for any real security reason,
and it seems to confuse people more often than it helps them. It could
also result in some database states being unrestorable. So just drop it.
Back-patch to 9.0, where ALTER DEFAULT PRIVILEGES was introduced.
Tom Lane [Sun, 9 Jun 2013 17:47:00 +0000 (13:47 -0400)]
Remove fixed limit on the number of concurrent AllocateFile() requests.
AllocateFile(), AllocateDir(), and some sister routines share a small array
for remembering requests, so that the files can be closed on transaction
failure. Previously that array had a fixed size, MAX_ALLOCATED_DESCS (32).
While historically that had seemed sufficient, Steve Toutant pointed out
that this meant you couldn't scan more than 32 file_fdw foreign tables in
one query, because file_fdw depends on the COPY code which uses
AllocateFile(). There are probably other cases, or will be in the future,
where this nonconfigurable limit impedes users.
We can't completely remove any such limit, at least not without a lot of
work, since each such request requires a kernel file descriptor and most
platforms limit the number we can have. (In principle we could
"virtualize" these descriptors, as fd.c already does for the main VFD pool,
but not without an additional layer of overhead and a lot of notational
impact on the calling code.) But we can at least let the array size be
configurable. Hence, change the code to allow up to max_safe_fds/2
allocated file requests. On modern platforms this should allow several
hundred concurrent file_fdw scans, or more if one increases the value of
max_files_per_process. To go much further than that, we'd need to do some
more work on the data structure, since the current code for closing
requests has potentially O(N^2) runtime; but it should still be all right
for request counts in this range.
Back-patch to 9.1 where contrib/file_fdw was introduced.
Andrew Dunstan [Sat, 8 Jun 2013 14:21:06 +0000 (10:21 -0400)]
Don't downcase non-ascii identifier chars in multi-byte encodings.
Long-standing code has called tolower() on identifier character bytes
with the high bit set. This is clearly an error and produces junk output
when the encoding is multi-byte. This patch therefore restricts this
activity to cases where there is a character with the high bit set AND
the encoding is single-byte.
There have been numerous gripes about this, most recently from Martin
Schäfer.
Tom Lane [Thu, 6 Jun 2013 03:44:08 +0000 (23:44 -0400)]
Prevent pushing down WHERE clauses into unsafe UNION/INTERSECT nests.
The planner is aware that it mustn't push down upper-level quals into
subqueries if the quals reference subquery output columns that contain
set-returning functions or volatile functions, or are non-DISTINCT outputs
of a DISTINCT ON subquery. However, it missed making this check when
there were one or more levels of UNION or INTERSECT above the dangerous
expression. This could lead to "set-valued function called in context that
cannot accept a set" errors, as seen in bug #8213 from Eric Soroos, or to
silently wrong answers in the other cases.
To fix, refactor the checks so that we make the column-is-unsafe checks
during subquery_is_pushdown_safe(), which already has to recursively
inspect all arms of a set-operation tree. This makes
qual_is_pushdown_safe() considerably simpler, at the cost that we will
spend some cycles checking output columns that possibly aren't referenced
in any upper qual. But the cases where this code gets executed at all
are already nontrivial queries, so it's unlikely anybody will notice any
slowdown of planning.
This has been broken since commit 05f916e6add9726bf4ee046e4060c1b03c9961f2,
which makes the bug over ten years old. A bit surprising nobody noticed it
before now.
Tom Lane [Wed, 5 Jun 2013 17:32:53 +0000 (13:32 -0400)]
Put analyze_keyword back in explain_option_name production.
In commit 2c92edad48796119c83d7dbe6c33425d1924626d, I broke "EXPLAIN
(ANALYZE)" syntax, because I mistakenly thought that ANALYZE/ANALYSE were
only partially reserved and thus would be included in NonReservedWord;
but actually they're fully reserved so they still need to be called out
here.
A nicer solution would be to demote these words to type_func_name_keyword
status (they can't be less than that because of "VACUUM [ANALYZE] ColId").
While that works fine so far as the core grammar is concerned, it breaks
ECPG's grammar for reasons I don't have time to isolate at the moment.
So do this for the time being.
Per report from Kevin Grittner. Back-patch to 9.0, like the previous
commit.
Tom Lane [Tue, 4 Jun 2013 21:22:29 +0000 (17:22 -0400)]
Provide better message when CREATE EXTENSION can't find a target schema.
The new message (and SQLSTATE) matches the corresponding error cases in
namespace.c.
This was thought to be a "can't happen" case when extension.c was written,
so we didn't think hard about how to report it. But it definitely can
happen in 9.2 and later, since we no longer require search_path to contain
any valid schema names. It's probably also possible in 9.1 if search_path
came from a noninteractive source. So, back-patch to all releases
containing this code.
Per report from Sean Chittenden, though this isn't exactly his patch.
Tom Lane [Tue, 4 Jun 2013 19:42:02 +0000 (15:42 -0400)]
Add ARM64 (aarch64) support to s_lock.h.
Use the same gcc atomic functions as we do on newer ARM chips.
(Basically this is a copy and paste of the __arm__ code block,
but omitting the SWPB option since that definitely won't work.)
Back-patch to 9.2. The patch would work further back, but we'd also
need to update config.guess/config.sub in older branches to make them
build out-of-the-box, and there hasn't been demand for it.
Tom Lane [Tue, 4 Jun 2013 18:58:52 +0000 (14:58 -0400)]
Fix memory leak in LogStandbySnapshot().
The array allocated by GetRunningTransactionLocks() needs to be pfree'd
when we're done with it. Otherwise we leak some memory during each
checkpoint, if wal_level = hot_standby. This manifests as memory bloat
in the checkpointer process, or in bgwriter in versions before we made
the checkpointer separate.
Reported and fixed by Naoya Anzai. Back-patch to 9.0 where the issue
was introduced.
In passing, improve comments for GetRunningTransactionLocks(), and add
an Assert that we didn't overrun the palloc'd array.
Tom Lane [Mon, 3 Jun 2013 18:19:32 +0000 (14:19 -0400)]
Add semicolons to eval'd strings to hide a minor Perl behavioral change.
"eval q{foo}" used to complain that the error was on line 2 of the eval'd
string, because eval internally tacked on "\n;" so that the end of the
erroneous command was indeed on line 2. But as of Perl 5.18 it more
sanely says that the error is on line 1. To avoid Perl-version-dependent
regression test results, use "eval q{foo;}" instead in the two places
where this matters. Per buildfarm.
Since people might try to use newer Perl versions with older PG releases,
back-patch as far as 9.0 where these test cases were added.
Tom Lane [Mon, 3 Jun 2013 00:09:26 +0000 (20:09 -0400)]
Allow type_func_name_keywords in some places where they weren't before.
This change makes type_func_name_keywords less reserved than they were
before, by allowing them for role names, language names, EXPLAIN and COPY
options, and SET values for GUCs; which are all places where few if any
actual keywords could appear instead, so no new ambiguities are introduced.
The main driver for this change is to allow "COPY ... (FORMAT BINARY)"
to work without quoting the word "binary". That is an inconsistency that
has been complained of repeatedly over the years (at least by Pavel Golub,
Kurt Lidl, and Simon Riggs); but we hadn't thought of any non-ugly solution
until now.
Back-patch to 9.0 where the COPY (FORMAT BINARY) syntax was introduced.
Stephen Frost [Mon, 27 May 2013 15:12:54 +0000 (11:12 -0400)]
Documentation fix for ALTER TYPE .. RENAME
The documentation for ALTER TYPE .. RENAME claimed to support a
RESTRICT/CASCADE option at the 'type' level, which wasn't implemented
and doesn't make a whole lot of sense to begin with. What is supported,
and previously undocumented, is
ALTER TYPE .. RENAME ATTRIBUTE .. RESTRICT/CASCADE.
I've updated the documentation and back-patched this to 9.1 where it was
first introduced.
When COPY uses the multi-insert method to insert a batch of tuples into the
heap at a time, incorrect line number was printed if something went wrong in
inserting the index tuples (primary key failure, for exampl), or processing
after row triggers.
Fixes bug #8173 reported by Lloyd Albin. Backpatch to 9.2, where the multi-
insert code was added.
Tom Lane [Thu, 16 May 2013 19:04:38 +0000 (15:04 -0400)]
Fix fd.c to preserve errno where needed.
PathNameOpenFile failed to ensure that the correct value of errno was
returned to its caller after a failure (because it incorrectly supposed
that free() can never change errno). In some cases this would result
in a user-visible failure because an expected ENOENT errno was replaced
with something else. Bogus EINVAL failures have been observed on OS X,
for example.
There were also a couple of places that could mangle an important value
of errno if FDDEBUG was defined. While the usefulness of that debug
support is highly debatable, we might as well make it safe to use,
so add errno save/restore logic to the DO_DB macro.
Per bug #8167 from Nelson Minar, diagnosed by RhodiumToad.
Back-patch to all supported branches.
Tom Lane [Mon, 13 May 2013 19:40:16 +0000 (15:40 -0400)]
Fix handling of OID wraparound while in standalone mode.
If OID wraparound should occur while in standalone mode (unlikely but
possible), we want to advance the counter to FirstNormalObjectId not
FirstBootstrapObjectId. Otherwise, user objects might be created with OIDs
in the system-reserved range. That isn't immediately harmful but it poses
a risk of conflicts during future pg_upgrade operations.
Noted by Andres Freund. Back-patch to all supported branches, since all of
them are supported sources for pg_upgrade operations.
Tom Lane [Sat, 11 May 2013 16:07:47 +0000 (12:07 -0400)]
Update CREATE FUNCTION documentation about argument names.
The 9.2 patch that added argument name support in SQL-language functions
missed updating a parenthetical comment about that in the CREATE FUNCTION
reference page. Noted by Erwin Brandstetter.
Tom Lane [Fri, 10 May 2013 21:15:35 +0000 (17:15 -0400)]
Guard against input_rows == 0 in estimate_num_groups().
This case doesn't normally happen, because the planner usually clamps
all row estimates to at least one row; but I found that it can arise
when dealing with relations excluded by constraints. Without a defense,
estimate_num_groups() can return zero, which leads to divisions by zero
inside the planner as well as assertion failures in the executor.
An alternative fix would be to change set_dummy_rel_pathlist() to make
the size estimate for a dummy relation 1 row instead of 0, but that seemed
pretty ugly; and probably someday we'll want to drop the convention that
the minimum rowcount estimate is 1 row.
Back-patch to 8.4, as the problem can be demonstrated that far back.
projects / postgresql / log