postgres

Commit Graph

Author	SHA1	Message	Date
Amit Kapila	41fb3f51cb	Fix a deadlock during ALTER SUBSCRIPTION ... DROP PUBLICATION. A deadlock can occur when the DDL command and the apply worker acquire catalog locks in different orders while dropping replication origins. The issue is rare in PG16 and higher branches because, in most cases, the tablesync worker performs the origin drop in those branches, and its locking sequence does not conflict with DDL operations. This patch ensures consistent lock acquisition to prevent such deadlocks. As per buildfarm. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Ajin Cherian <itsajin@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: vignesh C <vignesh21@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 14, where it was introduced Discussion: https://postgr.es/m/bab95e12-6cc5-4ebb-80a8-3e41956aa297@gmail.com	5 months ago
Noah Misch	7ee7c1cd38	Sort dump objects independent of OIDs, for the 7 holdout object types. pg_dump sorts objects by their logical names, e.g. (nspname, relname, tgname), before dependency-driven reordering. That removes one source of logically-identical databases differing in their schema-only dumps. In other words, it helps with schema diffing. The logical name sort ignored essential sort keys for constraints, operators, PUBLICATION ... FOR TABLE, PUBLICATION ... FOR TABLES IN SCHEMA, operator classes, and operator families. pg_dump's sort then depended on object OID, yielding spurious schema diffs. After this change, OIDs affect dump order only in the event of catalog corruption. While pg_dump also wrongly ignored pg_collation.collencoding, CREATE COLLATION restrictions have been keeping that imperceptible in practical use. Use techniques like we use for object types already having full sort key coverage. Where the pertinent queries weren't fetching the ignored sort keys, this adds columns to those queries and stores those keys in memory for the long term. The ignorance of sort keys became more problematic when commit `172259afb5` added a schema diff test sensitive to it. Buildfarm member hippopotamus witnessed that. However, dump order stability isn't a new goal, and this might avoid other dump comparison failures. Hence, back-patch to v13 (all supported versions). Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/20250707192654.9e.nmisch@google.com Backpatch-through: 13	5 months ago
Tom Lane	25388fb2cb	pg_dump: provide a stable sort order for rules. Previously, we sorted rules by schema name and then rule name; if that wasn't unique, we sorted by rule OID. This can be problematic for comparing dumps from databases with different histories, especially since certain rule names like "_RETURN" are very common. Let's make the sort key schema name, rule name, table name, which should be unique. (This is the same behavior we've long used for triggers and RLS policies.) Andreas Karlsson This back-patches v18 commit `350e6b8ea8` to all supported branches. The next commit will assert that pg_dump provides a stable sort order for all object types. That assertion would fail without stabilizing DO_RULE order as this commit did. Discussion: https://postgr.es/m/b4e468d8-0cd6-42e6-ac8a-1d6afa6e0cf1@proxel.se Discussion: https://postgr.es/m/20250707192654.9e.nmisch@google.com Backpatch-through: 13-17	5 months ago
Michael Paquier	60953d4cba	Fix ./configure checks with __cpuidex() and __cpuid() The configure checks used two incorrect functions when checking the presence of some routines in an environment: - __get_cpuidex() for the check of __cpuidex(). - __get_cpuid() for the check of __cpuid(). This means that Postgres has never been able to detect the presence of these functions, impacting environments where these exist, like Windows. Simply fixing the function name does not work. For example, using configure with MinGW on Windows causes the checks to detect all four of __get_cpuid(), __get_cpuid_count(), __cpuidex() and __cpuid() to be available, causing a compilation failure as this messes up with the MinGW headers as we would include both <intrin.h> and <cpuid.h>. The Postgres code expects only one in { __get_cpuid() , __cpuid() } and one in { __get_cpuid_count() , __cpuidex() } to exist. This commit reshapes the configure checks to do exactly what meson is doing, which has been working well for us: check one, then the other, but never allow both to be detected in a given build. The logic is wrong since `3dc2d62d04` and `792752af4e` where these checks have been introduced (the second case is most likely a copy-pasto coming from the first case), with meson documenting that the configure checks were broken. As far as I can see, they are not once applied consistently with what the code expects, but let's see if the buildfarm has different something to say. The comment in meson.build is adjusted as well, to reflect the new reality. Author: Lukas Fittl <lukas@fittl.com> Co-authored-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/aIgwNYGVt5aRAqTJ@paquier.xyz Backpatch-through: 13	5 months ago
Tom Lane	2dee95bd0c	Don't put library-supplied -L/-I switches before user-supplied ones. For many optional libraries, we extract the -L and -l switches needed to link the library from a helper program such as llvm-config. In some cases we put the resulting -L switches into LDFLAGS ahead of -L switches specified via --with-libraries. That risks breaking the user's intention for --with-libraries. It's not such a problem if the library's -L switch points to a directory containing only that library, but on some platforms a library helper may "helpfully" offer a switch such as -L/usr/lib that points to a directory holding all standard libraries. If the user specified --with-libraries in hopes of overriding the standard build of some library, the -L/usr/lib switch prevents that from happening since it will come before the user-specified directory. To fix, avoid inserting these switches directly into LDFLAGS during configure, instead adding them to LIBDIRS or SHLIB_LINK. They will still eventually get added to LDFLAGS, but only after the switches coming from --with-libraries. The same problem exists for -I switches: those coming from --with-includes should appear before any coming from helper programs such as llvm-config. We have not heard field complaints about this case, but it seems certain that a user attempting to override a standard library could have issues. The changes for this go well beyond configure itself, however, because many Makefiles have occasion to manipulate CPPFLAGS to insert locally-desirable -I switches, and some of them got it wrong. The correct ordering is any -I switches pointing at within-the- source-tree-or-build-tree directories, then those from the tree-wide CPPFLAGS, then those from helper programs. There were several places that risked pulling in a system-supplied copy of libpq headers, for example, instead of the in-tree files. (Commit `cb36f8ec2` fixed one instance of that a few months ago, but this exercise found more.) The Meson build scripts may or may not have any comparable problems, but I'll leave it to someone else to investigate that. Reported-by: Charles Samborski <demurgos@demurgos.net> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/70f2155f-27ca-4534-b33d-7750e20633d7@demurgos.net Backpatch-through: 13	5 months ago
Tom Lane	cdcdabce5b	Remove unnecessary complication around xmlParseBalancedChunkMemory. When I prepared `71c0921b6` et al yesterday, I was thinking that the logic involving explicitly freeing the node_list output was still needed to dodge leakage bugs in libxml2. But I was misremembering: we introduced that only because with early 2.13.x releases we could not trust xmlParseBalancedChunkMemory's result code, so we had to look to see if a node list was returned or not. There's no reason to believe that xmlParseBalancedChunkMemory will fail to clean up the node list when required, so simplify. (This essentially completes reverting all the non-cosmetic changes in 6082b3d5d.) Reported-by: Jim Jones <jim.jones@uni-muenster.de> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/997668.1753802857@sss.pgh.pa.us Backpatch-through: 13	5 months ago
Alexander Korotkov	276b022ec0	Clarify documentation for the initcap function This commit documents differences in the definition of word separators for the initcap function between libc and ICU locale providers. Backpatch to all supported branches. Discussion: https://postgr.es/m/804cc10ef95d4d3b298e76b181fd9437%40postgrespro.ru Author: Oleg Tselebrovskiy <o.tselebrovskiy@postgrespro.ru> Backpatch-through: 13	5 months ago
Tom Lane	0395464aff	Avoid regression in the size of XML input that we will accept. This mostly reverts commit `6082b3d5d`, "Use xmlParseInNodeContext not xmlParseBalancedChunkMemory". It turns out that xmlParseInNodeContext will reject text chunks exceeding 10MB, while (in most libxml2 versions) xmlParseBalancedChunkMemory will not. The bleeding-edge libxml2 bug that we needed to work around a year ago is presumably no longer a factor, and the argument that xmlParseBalancedChunkMemory is semi-deprecated is not enough to justify a functionality regression. Hence, go back to doing it the old way. Reported-by: Michael Paquier <michael@paquier.xyz> Author: Michael Paquier <michael@paquier.xyz> Co-authored-by: Erik Wienhold <ewie@ewie.name> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/aIGknLuc8b8ega2X@paquier.xyz Backpatch-through: 13	5 months ago
Alexander Korotkov	50026136cc	Limit checkpointer requests queue size If the number of sync requests is big enough, the palloc() call in AbsorbSyncRequests() will attempt to allocate more than 1 GB of memory, resulting in failure. This can lead to an infinite loop in the checkpointer process, as it repeatedly fails to absorb the pending requests. This commit limits the checkpointer requests queue size to 10M items. In addition to preventing the palloc() failure, this change helps to avoid long queue processing time. Also, this commit is for backpathing only. The master branch receives a more invasive yet comprehensive fix for this problem. Discussion: https://postgr.es/m/db4534f83a22a29ab5ee2566ad86ca92%40postgrespro.ru Backpatch-through: 13	5 months ago
Tom Lane	868b39a544	Fix build breakage on Solaris-alikes with late-model GCC. Solaris has never bothered to add "const" to the second argument of PAM conversation procs, as all other Unixen did decades ago. This resulted in an "incompatible pointer" compiler warning when building --with-pam, but had no more serious effect than that, so we never did anything about it. However, as of GCC 14 the case is an error not warning by default. To complicate matters, recent OpenIndiana (and maybe illumos in general?) does supply the "const" by default, so we can't just assume that platforms using our solaris template need help. What we can do, short of building a configure-time probe, is to make solaris.h #define _PAM_LEGACY_NONCONST, which causes OpenIndiana's pam_appl.h to revert to the traditional definition, and hopefully will have no effect anywhere else. Then we can use that same symbol to control whether we include "const" in the declaration of pam_passwd_conv_proc(). Bug: #18995 Reported-by: Andrew Watkins <awatkins1966@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18995-82058da9ab4337a7@postgresql.org Backpatch-through: 13	5 months ago
Michael Paquier	408fe659a8	ecpg: Fix NULL pointer dereference during connection lookup ECPGconnect() caches established connections to the server, supporting the case of a NULL connection name when a database name is not specified by its caller. A follow-up call to ECPGget_PGconn() to get an established connection from the cached set with a non-NULL name could cause a NULL pointer dereference if a NULL connection was listed in the cache and checked for a match. At least two connections are necessary to reproduce the issue: one with a NULL name and one with a non-NULL name. Author: Aleksander Alekseev <aleksander@tigerdata.com> Discussion: https://postgr.es/m/CAJ7c6TNvFTPUTZQuNAoqgzaSGz-iM4XR61D7vEj5PsQXwg2RyA@mail.gmail.com Backpatch-through: 13	5 months ago
Fujii Masao	7efaf0a1b3	doc: Document reopen of output file via SIGHUP in pg_recvlogical. When pg_recvlogical receives a SIGHUP signal, it closes the current output file and reopens a new one. This is useful since it allows us to rotate the output file by renaming the current file and sending a SIGHUP. This behavior was previously undocumented. This commit adds the missing documentation. Back-patch to all supported versions. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Shinya Kato <shinya11.kato@gmail.com> Discussion: https://postgr.es/m/0977fc4f-1523-4ecd-8a0e-391af4976367@oss.nttdata.com Backpatch-through: 13	5 months ago
Alexander Korotkov	bedfdb85b0	Fix infinite wait when reading a partially written WAL record If a crash occurs while writing a WAL record that spans multiple pages, the recovery process marks the page with the XLP_FIRST_IS_OVERWRITE_CONTRECORD flag. However, logical decoding currently attempts to read the full WAL record based on its expected size before checking this flag, which can lead to an infinite wait if the remaining data is never written (e.g., no activity after crash). This patch updates the logic first to read the page header and check for the XLP_FIRST_IS_OVERWRITE_CONTRECORD flag before attempting to reconstruct the full WAL record. If the flag is set, decoding correctly identifies the record as incomplete and avoids waiting for WAL data that will never arrive. Discussion: https://postgr.es/m/CAAKRu_ZCOzQpEumLFgG_%2Biw3FTa%2BhJ4SRpxzaQBYxxM_ZAzWcA%40mail.gmail.com Discussion: https://postgr.es/m/CALDaNm34m36PDHzsU_GdcNXU0gLTfFY5rzh9GSQv%3Dw6B%2BQVNRQ%40mail.gmail.com Author: Vignesh C <vignesh21@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Backpatch-through: 13	5 months ago
Tom Lane	d5cba77462	Fix PQport to never return NULL unless the connection is NULL. This is the documented behavior, and it worked that way before v10. However, addition of the connhost[] array created cases where conn->connhost[conn->whichhost].port is NULL. The rest of libpq is careful to substitute DEF_PGPORT[_STR] for a null or empty port string, but we failed to do so here, leading to possibly returning NULL. As of v18 that causes psql's \conninfo command to segfault. Older psql versions avoid that, but it's pretty likely that other clients have trouble with this, so we'd better back-patch the fix. In stable branches, just revert to our historical behavior of returning an empty string when there was no user-given port specification. However, it seems substantially more useful and indeed more correct to hand back DEF_PGPORT_STR in such cases, so let's make v18 and master do that. Author: Daniele Varrazzo <daniele.varrazzo@gmail.com> Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CA+mi_8YTS8WPZPO0PAb2aaGLwHuQ0DEQRF0ZMnvWss4y9FwDYQ@mail.gmail.com Backpatch-through: 13	5 months ago
Álvaro Herrera	b9a8968284	Remove assertion from PortalRunMulti We have an assertion to ensure that a command tag has been assigned by the time we're done executing, but if we happen to execute a command with no queries, the assertion would fail. Per discussion, rather than contort things to get a tag assigned, just remove the assertion. Oversight in `2f9661311b`. That commit also retained a comment that explained logic that had been adjacent to it but diffused into various places, leaving none apt to keep part of the comment. Remove that part, and rewrite what remains for extra clarity. Bug: #18984 Backpatch-through: 13 Reported-by: Aleksander Alekseev <aleksander@tigerdata.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Michaël Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/18984-0f4778a6599ac3ae@postgresql.org	5 months ago
Daniel Gustafsson	01d1c45c0a	doc: Add example file for COPY The paragraph for introducing INSERT and COPY discussed how a file could be used for bulk loading with COPY, without actually showing what the file would look like. This adds a programlisting for the file contents. Backpatch to all supported branches since this example has lacked the file contents since PostgreSQL 7.2. Author: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/158017814191.19852.15019251381150731439@wrigleys.postgresql.org Backpatch-through: 13	5 months ago
Álvaro Herrera	e04aca1c4d	Fix dumping of comments on invalid constraints on domains We skip dumping constraints together with domains if they are invalid ('separate') so that they appear after data -- but their comments were dumped together with the domain definition, which in effect leads to the comment being dumped when the constraint does not yet exist. Delay them in the same way. Oversight in 7eca575d1c28; backpatch all the way back. Author: jian he <jian.universality@gmail.com> Discussion: https://postgr.es/m/CACJufxF_C2pe6J_+nPr6C5jf5rQnbYP8XOKr4HM8yHZtp2aQqQ@mail.gmail.com	5 months ago
Nathan Bossart	0490d6efd2	psql: Fix note on project naming in output of \copyright. This adjusts the wording to match the changes in commits `5987553fde`, `a233a603ba`, and pgweb commit 2d764dbc08. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://postgr.es/m/aHVo791guQR6uqwT%40nathan Backpatch-through: 13	5 months ago
Tom Lane	6f7d016e91	Doc: clarify description of regexp fields in pg_ident.conf. The grammar was a little shaky and confusing here, so word-smith it a bit. Also, adjust the comments in pg_ident.conf.sample to use the same terminology as the SGML docs, in particular "DATABASE-USERNAME" not "PG-USERNAME". Back-patch appropriate subsets. I did not risk changing pg_ident.conf.sample in released branches, but it still seems OK to change it in v18. Reported-by: Alexey Shishkin <alexey.shishkin@enterprisedb.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: David G. Johnston <david.g.johnston@gmail.com> Discussion: https://postgr.es/m/175206279327.3157504.12519088928605422253@wrigleys.postgresql.org Backpatch-through: 13	5 months ago
Tom Lane	8254b7e33b	Silence uninitialized-value warnings in compareJsonbContainers(). Because not every path through JsonbIteratorNext() sets val->type, some compilers complain that compareJsonbContainers() is comparing possibly-uninitialized values. The paths that don't set it return WJB_DONE, WJB_END_ARRAY, or WJB_END_OBJECT, so it's clear by manual inspection that the "(ra == rb)" code path is safe, and indeed we aren't seeing warnings about that. But the (ra != rb) case is much less obviously safe. In Assert-enabled builds it seems that the asserts rejecting WJB_END_ARRAY and WJB_END_OBJECT persuade gcc 15.x not to warn, which makes little sense because it's impossible to believe that the compiler can prove of its own accord that ra/rb aren't WJB_DONE here. (In fact they never will be, so the code isn't wrong, but why is there no warning?) Without Asserts, the appearance of warnings is quite unsurprising. We discussed fixing this by converting those two Asserts into pg_assume, but that seems not very satisfactory when it's so unclear why the compiler is or isn't warning: the warning could easily reappear with some other compiler version. Let's fix it in a less magical, more future-proof way by changing JsonbIteratorNext() so that it always does set val->type. The cost of that should be pretty negligible, and it makes the function's API spec less squishy. Reported-by: Erik Rijkers <er@xs4all.nl> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/988bf1bc-3f1f-99f3-bf98-222f1cd9dc5e@xs4all.nl Discussion: https://postgr.es/m/0c623e8a204187b87b4736792398eaf1@postgrespro.ru Backpatch-through: 13	5 months ago
Tom Lane	209a22d794	Doc: clarify description of current-date/time functions. Minor wordsmithing of the func.sgml paragraph describing statement_timestamp() and allied functions: don't switch between "statement" and "command" when those are being used to mean about the same thing. Also, add some text to protocol.sgml describing the perhaps-surprising behavior these functions have in a multi-statement Query message. Reported-by: P M <petermittere@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at> Reviewed-by: David G. Johnston <david.g.johnston@gmail.com> Discussion: https://postgr.es/m/175223006802.3157505.14764328206246105568@wrigleys.postgresql.org Backpatch-through: 13	5 months ago
Tom Lane	ac8cdb2495	Fix inconsistent quoting of role names in ACLs. getid() and putid(), which parse and deparse role names within ACL input/output, applied isalnum() to see if a character within a role name requires quoting. They did this even for non-ASCII characters, which is problematic because the results would depend on encoding, locale, and perhaps even platform. So it's possible that putid() could elect not to quote some string that, later in some other environment, getid() will decide is not a valid identifier, causing dump/reload or similar failures. To fix this in a way that won't risk interoperability problems with unpatched versions, make getid() treat any non-ASCII as a legitimate identifier character (hence not requiring quotes), while making putid() treat any non-ASCII as requiring quoting. We could remove the resulting excess quoting once we feel that no unpatched servers remain in the wild, but that'll be years. A lesser problem is that getid() did the wrong thing with an input consisting of just two double quotes (""). That has to represent an empty string, but getid() read it as a single double quote instead. The case cannot arise in the normal course of events, since we don't allow empty-string role names. But let's fix it while we're here. Although we've not heard field reports of problems with non-ASCII role names, there's clearly a hazard there, so back-patch to all supported versions. Reported-by: Peter Eisentraut <peter@eisentraut.org> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/3792884.1751492172@sss.pgh.pa.us Backpatch-through: 13	6 months ago
Masahiko Sawada	0514616f0e	Fix tab-completion for COPY and \copy options. Commit `c273d9d8ce` reworked tab-completion of COPY and \copy in psql and added support for completing options within WITH clauses. However, the same COPY options were suggested for both COPY TO and COPY FROM commands, even though some options are only valid for one or the other. This commit separates the COPY options for COPY FROM and COPY TO commands to provide more accurate auto-completion suggestions. Back-patch to v14 where tab-completion for COPY and \copy options within WITH clauses was first supported. Author: Atsushi Torikoshi <torikoshia@oss.nttdata.com> Reviewed-by: Yugo Nagata <nagata@sraoss.co.jp> Discussion: https://postgr.es/m/079e7a2c801f252ae8d522b772790ed7@oss.nttdata.com Backpatch-through: 14	6 months ago
Tom Lane	602c91cf2e	Restore the ability to run pl/pgsql expression queries in parallel. pl/pgsql's notion of an "expression" is very broad, encompassing any SQL SELECT query that returns a single column and no more than one row. So there are cases, for example evaluation of an aggregate function, where the query involves significant work and it'd be useful to run it with parallel workers. This used to be possible, but commits `3eea7a0c9` et al unintentionally disabled it. The simplest fix is to make exec_eval_expr() pass maxtuples = 0 rather than 2 to exec_run_select(). This avoids the new rule that we will never use parallelism when a nonzero "count" limit is passed to ExecutorRun(). (Note that the pre-3eea7a0c9 behavior was indeed unsafe, so reverting that rule is not in the cards.) The reason for passing 2 before was that exec_eval_expr() will throw an error if it gets more than one returned row, so we figured that as soon as we have two rows we know that will happen and we might as well stop running the query. That choice was cost-free when it was made; but disabling parallelism is far from cost-free, so now passing 2 amounts to optimizing a failure case at the expense of useful cases. An expression query that can return more than one row is certainly broken. People might now need to wait a bit longer to discover such breakage; but hopefully few will use enormously expensive cases as their first test of new pl/pgsql logic. Author: Dipesh Dhameliya <dipeshdhameliya125@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CABgZEgdfbnq9t6xXJnmXbChNTcWFjeM_6nuig41tm327gYi2ig@mail.gmail.com Backpatch-through: 13	6 months ago
Michael Paquier	ac166b19a1	Fix incompatibility with libxml2 >= 2.14 libxml2 has deprecated the members of xmlBuffer, and it is recommended to access them with dedicated routines. We have only one case in the tree where this shows an impact: xml2/xpath.c where "content" was getting directly accessed. The rest of the code looked fine, checking the PostgreSQL code with libxml2 close to the top of its "2.14" branch. xmlBufferContent() exists since year 2000 based on a check of the upstream libxml2 tree, so let's switch to it. Like `400928b83b`, backpatch all the way down as this can have an impact on all the branches already released once newer versions of libxml2 get more popular. Reported-by: Walid Ibrahim <walidib@amazon.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/aGdSdcR4QTjEHX6s@paquier.xyz Backpatch-through: 13	6 months ago
Álvaro Herrera	94dc2b37ba	Fix new pg_upgrade query not to rely on regnamespace That was invented in 9.5, and pg_upgrade claims to support back to 9.0. But we don't need that with a simple query change, tested by Tom Lane. Discussion: https://postgr.es/m/202507041645.afjl5rssvrgu@alvherre.pgsql	6 months ago
Álvaro Herrera	ea3386cc78	pg_upgrade: check for inconsistencies in not-null constraints w/inheritance With tables defined like this, CREATE TABLE ip (id int PRIMARY KEY); CREATE TABLE ic (id int) INHERITS (ip); ALTER TABLE ic ALTER id DROP NOT NULL; pg_upgrade fails during the schema restore phase due to this error: ERROR: column "id" in child table must be marked NOT NULL This can only be fixed by marking the child column as NOT NULL before the upgrade, which could take an arbitrary amount of time (because ic's data must be scanned). Have pg_upgrade's check mode warn if that condition is found, so that users know what to adjust before running the upgrade for real. Author: Ali Akbar <the.apaan@gmail.com> Reviewed-by: Justin Pryzby <pryzby@telsasoft.com> Backpatch-through: 13 Discussion: https://postgr.es/m/CACQjQLoMsE+1pyLe98pi0KvPG2jQQ94LWJ+PTiLgVRK4B=i_jg@mail.gmail.com	6 months ago
Michael Paquier	b61ddcaf41	Disable commit timestamps during bootstrap Attempting to use commit timestamps during bootstrapping leads to an assertion failure, that can be reached for example with an initdb -c that enables track_commit_timestamp. It makes little sense to register a commit timestamp for a BootstrapTransactionId, so let's disable the activation of the module in this case. This problem has been independently reported once by each author of this commit. Each author has proposed basically the same patch, relying on IsBootstrapProcessingMode() to skip the use of commit_ts during bootstrap. The test addition is a suggestion by me, and is applied down to v16. Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Author: Andy Fan <zhihuifan1213@163.com> Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/OSCPR01MB14966FF9E4C4145F37B937E52F5102@OSCPR01MB14966.jpnprd01.prod.outlook.com Discussion: https://postgr.es/m/87plejmnpy.fsf@163.com Backpatch-through: 13	6 months ago
Tom Lane	e902f81819	Obtain required table lock during cross-table updates, redux. Commits `8319e5cb5` et al missed the fact that ATPostAlterTypeCleanup contains three calls to ATPostAlterTypeParse, and the other two also need protection against passing a relid that we don't yet have lock on. Add similar logic to those code paths, and add some test cases demonstrating the need for it. In v18 and master, the test cases demonstrate that there's a behavioral discrepancy between stored generated columns and virtual generated columns: we disallow changing the expression of a stored column if it's used in any composite-type columns, but not that of a virtual column. Since the expression isn't actually relevant to either sort of composite-type usage, this prohibition seems unnecessary; but changing it is a matter for separate discussion. For now we are just documenting the existing behavior. Reported-by: jian he <jian.universality@gmail.com> Author: jian he <jian.universality@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: CACJufxGKJtGNRRSXfwMW9SqVOPEMdP17BJ7DsBf=tNsv9pWU9g@mail.gmail.com Backpatch-through: 13	6 months ago
Fujii Masao	f062e43484	doc: Remove incorrect note about wal_status in pg_replication_slots. The documentation previously stated that the wal_status column is NULL if restart_lsn is NULL in the pg_replication_slots view. This is incorrect, and wal_status can be "lost" even when restart_lsn is NULL. This commit removes the incorrect description. Back-patched to all supported versions. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Nisha Moond <nisha.moond412@gmail.com> Discussion: https://postgr.es/m/c9d23cdc-b5dd-455a-8ee9-f1f24d701d89@oss.nttdata.com Backpatch-through: 13	6 months ago
Nathan Bossart	e35a0174a9	Document pg_get_multixact_members(). Oversight in commit `0ac5ad5134`. Author: Sami Imseih <samimseih@gmail.com> Co-authored-by: Álvaro Herrera <alvherre@kurilemu.de> Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com> Discussion: https://postgr.es/m/20150619215231.GT133018%40postgresql.org Discussion: https://postgr.es/m/CAA5RZ0sjQDDwJfMRb%3DZ13nDLuRpF13ME2L_BdGxi0op8RKjmDg%40mail.gmail.com Backpatch-through: 13	6 months ago
Tom Lane	71d71ac4d1	Make safeguard against incorrect flags for fsync more portable. The existing code assumed that O_RDONLY is defined as 0, but this is not required by POSIX and is not true on GNU Hurd. We can avoid the assumption by relying on O_ACCMODE to mask the fcntl() result. (Hopefully, all supported platforms define that.) Author: Michael Banck <mbanck@gmx.net> Co-authored-by: Samuel Thibault Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/6862e8d1.050a0220.194b8d.76fa@mx.google.com Discussion: https://postgr.es/m/68480868.5d0a0220.1e214d.68a6@mx.google.com Backpatch-through: 13	6 months ago
Nathan Bossart	326f2aaee6	Document age(xid) and mxid_age(xid). These functions have been around for some time, but commits `48b5aa3143` and `15afb7d61c` were only back-patched to v16. Let's back-patch them to all supported versions now. Reported-by: David Rowley <dgrowleyml@gmail.com> (commit `48b5aa3143`) Author: Bruce Momjian <bruce@momjian.us> (commit `48b5aa3143`) Co-authored-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> (commit `15afb7d61c`) Reviewed-by: Michael Paquier <michael@paquier.xyz> (commit `15afb7d61c`) Reviewed-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de> Discussion: https://postgr.es/m/aGMCxHxLfeMdQk8m%40nathan Backpatch-through: 13-15	6 months ago
Tom Lane	25cab44735	Obtain required table lock during cross-table constraint updates. Sometimes a table's constraint may depend on a column of another table, so that we have to update the constraint when changing the referenced column's type. We need to have lock on the constraint's table to do that. ATPostAlterTypeCleanup believed that this case was only possible for FOREIGN KEY constraints, but it's wrong at least for CHECK and EXCLUDE constraints; and in general, we'd probably need exclusive lock to alter any sort of constraint. So just remove the contype check and acquire lock for any other table. This prevents a "you don't have lock" assertion failure, though no ill effect is observed in production builds. We'll error out later anyway because we don't presently support physically altering column types within stored composite columns. But the catalog-munging is basically all there, so we may as well make that part work. Bug: #18970 Reported-by: Alexander Lakhin <exclusion@gmail.com> Diagnosed-by: jian he <jian.universality@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18970-a7d1cfe1f8d5d8d9@postgresql.org Backpatch-through: 13	6 months ago
Nathan Bossart	e2f0628212	Use correct DatumGet*() function in test_shm_mq_main(). This is purely cosmetic, as dsm_attach() interprets its argument as a dsm_handle (i.e., an unsigned integer), but we might as well fix it. Oversight in commit `4db3744f1f`. Author: Jianghua Yang <yjhjstz@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAAZLFmRxkUD5jRs0W3K%3DUe4_ZS%2BRcAb0PCE1S0vVJBn3sWH2UQ%40mail.gmail.com Backpatch-through: 13	6 months ago
Melanie Plageman	5a24c20c84	Remove unused check in heap_xlog_insert() `8e03eb92e9` reverted the commit `39b66a91bd` which allowed freezing in the heap_insert() code path but forgot to remove the corresponding check in heap_xlog_insert(). This code is extraneous but not harmful. However, cleaning it up makes it very clear that, as of now, we do not support any freezing of pages in the heap_insert() path. Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Tomas Vondra <tomas@vondra.me> Discussion: https://postgr.es/m/flat/CAAKRu_Zp4Pi-t51OFWm1YZ-cctDfBhHCMZ%3DEx6PKxv0o8y2GvA%40mail.gmail.com Backpatch-through: 14	6 months ago
Michael Paquier	c079ba3fc2	Avoid scribbling of VACUUM options This fixes two issues with the handling of VacuumParams in vacuum_rel(). This code path has the idea to change the passed-in pointer of VacuumParams for the "truncate" and "index_cleanup" options for the relation worked on, impacting the two following scenarios where incorrect options may be used because a VacuumParams pointer is shared across multiple relations: - Multiple relations in a single VACUUM command. - TOAST relations vacuumed with their main relation. The problem is avoided by providing to the two callers of vacuum_rel() copies of VacuumParams, before the pointer is updated for the "truncate" and "index_cleanup" options. The refactoring of the VACUUM option and parameters done in `0d83138974` did not introduce an issue, but it has encouraged the problem we are dealing with in this commit, with `b84dbc8eb8` for "truncate" and `a96c41feec` for "index_cleanup" that have been added a couple of years after the initial refactoring. HEAD will be improved with a different patch that hardens the uses of VacuumParams across the tree. This cannot be backpatched as it introduces an ABI breakage. The backend portion of the patch has been authored by Nathan, while I have implemented the tests. The tests rely on injection points to check the option values, making them faster, more reliable than the tests originally proposed by Shihao, and they also provide more coverage. This part can only be backpatched down to v17. Reported-by: Shihao Zhong <zhong950419@gmail.com> Author: Nathan Bossart <nathandbossart@gmail.com> Co-authored-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/CAGRkXqTo+aK=GTy5pSc-9cy8H2F2TJvcrZ-zXEiNJj93np1UUw@mail.gmail.com Backpatch-through: 13	6 months ago
Daniel Gustafsson	af2c08671b	doc: Remove dead link to NewbieDoc Docbook Guide The link returns 404 and no replacement is available in the project on Sourceforge where the content once was. Since we already link to resources for both beginner and experienced docs hackers, remove the the dead link. Backpatch to all supported versions as the link was added in 8.1. Author: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Magnus Hagander <magnus@hagander.net> Reviewed-by: Michael Paquier <michael@paquier.xyz> Reported-by: jian he <jian.universality@gmail.com> Discussion: https://postgr.es/m/CACJufxH=YzQPDOe+2WuYZ7seD-BOyjCBmP6JiErpoSiVZWDRnw@mail.gmail.com Backpatch-through: 13	6 months ago
Fujii Masao	5fbaf0ffb5	doc: Fix incorrect UUID index entry in function documentation. Previously, the UUID functions documentation defined the "UUID" index entry to link to the UUID data type page, even though that entry already exists there. Instead, the UUID functions page should define its own index entry linking to itself. This commit updates the UUID index entry in the UUID functions documentation to point to the correct section, improving navigation and avoiding duplication. Back-patch to all supported versions. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://postgr.es/m/f33e0493-5773-4296-87c5-7ce459054cfe@oss.nttdata.com Backpatch-through: 13	6 months ago
Tom Lane	9bd588f87d	Doc: improve documentation about width_bucket(). Specify whether the bucket bounds are inclusive or exclusive, and improve some other vague language. Explain the behavior that occurs when the "low" bound is greater than the "high" bound. Make width_bucket_numeric's comment more like that for width_bucket_float8, in particular noting that infinite bounds are rejected (since they became possible in v14). Reported-by: Ben Peachey Higdon <bpeacheyhigdon@gmail.com> Author: Robert Treat <rob@xzilla.net> Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com> Discussion: https://postgr.es/m/2BD74F86-5B89-4AC1-8F13-23CED3546AC1@gmail.com Backpatch-through: 13	6 months ago
Tom Lane	27af8b9be8	Use SnapshotDirty when checking for conflicting index names. While choosing an autogenerated name for an index, look for pre-existing relations using a SnapshotDirty snapshot, instead of the previous behavior that considered only committed-good pg_class rows. This allows us to detect and avoid conflicts against indexes that are still being built. It's still possible to fail due to a race condition, but the window is now just the amount of time that it takes DefineIndex to validate all its parameters, call smgrcreate(), and enter the index's pg_class row. Formerly the race window covered the entire time needed to create and fill an index, which could be very long if the table is large. Worse, if the conflicting index creation is part of a larger transaction, it wouldn't be visible till COMMIT. So this isn't a complete solution, but it should greatly ameliorate the problem, and the patch is simple enough to be back-patchable. It might at some point be useful to do the same for pg_constraint entries (cf. ChooseConstraintName, ConstraintNameExists, and related functions). However, in the absence of field complaints, I'll leave that alone for now. The relation-name test should be good enough for index-based constraints, while foreign-key constraints seem to be okay since they require exclusive locks to create. Bug: #18959 Reported-by: Maximilian Chrzan <maximilian.chrzan@here.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com> Discussion: https://postgr.es/m/18959-f63b53b864bb1417@postgresql.org Backpatch-through: 13	6 months ago
Masahiko Sawada	983b363625	Fix re-distributing previously distributed invalidation messages during logical decoding. Commit `4909b38af0` introduced logic to distribute invalidation messages from catalog-modifying transactions to all concurrent in-progress transactions. However, since each transaction distributes not only its original invalidation messages but also previously distributed messages to other transactions, this leads to an exponential increase in allocation request size for invalidation messages, ultimately causing memory allocation failure. This commit fixes this issue by tracking distributed invalidation messages separately per decoded transaction and not redistributing these messages to other in-progress transactions. The maximum size of distributed invalidation messages that one transaction can store is limited to MAX_DISTR_INVAL_MSG_PER_TXN (8MB). Once the size of the distributed invalidation messages exceeds this threshold, we invalidate all caches in locations where distributed invalidation messages need to be executed. Back-patch to all supported versions where we introduced the fix by commit `4909b38af0`. Note that this commit adds two new fields to ReorderBufferTXN to store the distributed transactions. This change breaks ABI compatibility in back branches, affecting third-party extensions that depend on the size of the ReorderBufferTXN struct, though this scenario seems unlikely. Additionally, it adds a new flag to the txn_flags field of ReorderBufferTXN to indicate distributed invalidation message overflow. This should not affect existing implementations, as it is unlikely that third-party extensions use unused bits in the txn_flags field. Bug: #18938 #18942 Author: vignesh C <vignesh21@gmail.com> Reported-by: Duncan Sands <duncan.sands@deepbluecap.com> Reported-by: John Hutchins <john.hutchins@wicourts.gov> Reported-by: Laurence Parry <greenreaper@hotmail.com> Reported-by: Max Madden <maxmmadden@gmail.com> Reported-by: Braulio Fdo Gonzalez <brauliofg@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Discussion: https://postgr.es/m/680bdaf6-f7d1-4536-b580-05c2760c67c6@deepbluecap.com Discussion: https://postgr.es/m/18942-0ab1e5ae156613ad@postgresql.org Discussion: https://postgr.es/m/18938-57c9a1c463b68ce0@postgresql.org Discussion: https://postgr.es/m/CAD1FGCT2sYrP_70RTuo56QTizyc+J3wJdtn2gtO3VttQFpdMZg@mail.gmail.com Discussion: https://postgr.es/m/CANO2=B=2BT1hSYCE=nuuTnVTnjidMg0+-FfnRnqM6kd23qoygg@mail.gmail.com Backpatch-through: 13	6 months ago
Alexander Korotkov	e2832bd961	Keep WAL segments by the flushed value of the slot's restart LSN The patch fixes the issue with the unexpected removal of old WAL segments after checkpoint, followed by an immediate restart. The issue occurs when a slot is advanced after the start of the checkpoint and before old WAL segments are removed at the end of the checkpoint. The idea of the patch is to get the minimal restart_lsn at the beginning of checkpoint (or restart point) creation and use this value when calculating the oldest LSN for WAL segments removal at the end of checkpoint. This idea was proposed by Tomas Vondra in the discussion. Unlike 291221c46575, this fix doesn't affect ABI and is intended for back branches. Discussion: https://postgr.es/m/flat/1d12d2-67235980-35-19a406a0%4063439497 Author: Vitaly Davydov <v.davydov@postgrespro.ru> Reviewed-by: Tomas Vondra <tomas@vondra.me> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 13	6 months ago
Peter Geoghegan	7c7c0a77dc	Make _bt_killitems drop pins it acquired itself. Teach nbtree's _bt_killitems to leave the so->currPos page that it sets LP_DEAD items on in whatever state it was in when _bt_killitems was called. In particular, make sure that so->dropPin scans don't acquire a pin whose reference is saved in so->currPos.buf. Allowing _bt_killitems to change so->currPos.buf like this is wrong. The immediate consequence of allowing it is that code in _bt_steppage (that copies so->currPos into so->markPos) will behave as if the scan is a !so->dropPin scan. so->markPos will therefore retain the buffer pin indefinitely, even though _bt_killitems only needs to acquire a pin (along with a lock) for long enough to mark known-dead items LP_DEAD. This issue came to light following a report of a failure of an assertion from recent commit `e6eed40e`. The test case in question involves the use of mark and restore. An initial call to _bt_killitems takes place that leaves so->currPos.buf in a state that is inconsistent with the scan being so->dropPin. A subsequent call to _bt_killitems for the same position (following so->currPos being saved in so->markPos, and then restored as so->currPos) resulted in the failure of an assertion that tests that so->currPos.buf is InvalidBuffer when the scan is so->dropPin (non-assert builds got a "resource was not closed" WARNING instead). The same problem exists on earlier releases, though the issue is far more subtle there. Recent commit `e6eed40e` introduced the so->dropPin field as a partial replacement for testing so->currPos.buf directly. Earlier releases won't get an assertion failure (or buffer pin leak), but they will allow the second _bt_killitems call from the test case to behave as if a buffer pin was consistently held since the original call to _bt_readpage. This is wrong; there will have been an initial window during which no pin was held on the so->currPos page, and yet the second _bt_killitems call will neglect to check if so->currPos.lsn continues to match the page's now-current LSN. As a result of all this, it's just about possible that _bt_killitems will set the wrong items LP_DEAD (on release branches). This could only happen with merge joins (the sole user of nbtree mark/restore support), when a concurrently inserted index tuple used a recently-recycled TID (and only when the new tuple was inserted onto the same page as a distinct concurrently-removed tuple with the same TID). This is exactly the scenario that _bt_killitems' check of the page's now-current LSN against the LSN stashed in currPos was supposed to prevent. A follow-up commit will make nbtree completely stop conditioning whether or not a position's pin needs to be dropped on whether the 'buf' field is set. All call sites that might need to drop a still-held pin will be taught to rely on the scan-level so->dropPin field recently introduced by commit `e6eed40e`. That will make bugs of the same general nature as this one impossible (or make them much easier to detect, at least). Author: Peter Geoghegan <pg@bowt.ie> Reported-By: Alexander Lakhin <exclusion@gmail.com> Discussion: https://postgr.es/m/545be1e5-3786-439a-9257-a90d30f8b849@gmail.com Backpatch-through: 13	7 months ago
Tom Lane	0703c9385b	Don't reduce output request size on non-Unix-socket connections. Traditionally, libpq's pqPutMsgEnd has rounded down the amount-to-send to be a multiple of 8K when it is eagerly writing some data. This still seems like a good idea when sending through a Unix socket, as pipes typically have a buffer size of 8K or some fraction/multiple of that. But there's not much argument for it on a TCP connection, since (a) standard MTU values are not commensurate with that, and (b) the kernel typically applies its own packet splitting/merging logic. Worse, our SSL and GSSAPI code paths both have API stipulations that if they fail to send all the data that was offered in the previous write attempt, we mustn't offer less data in the next attempt; else we may get "SSL error: bad length" or "GSSAPI caller failed to retransmit all data needing to be retried". The previous write attempt might've been pqFlush attempting to send everything in the buffer, so pqPutMsgEnd can't safely write less than the full buffer contents. (Well, we could add some more state to track exactly how much the previous write attempt was, but there's little value evident in such extra complication.) Hence, apply the round-down only on AF_UNIX sockets, where we never use SSL or GSSAPI. Interestingly, we had a very closely related bug report before, which I attempted to fix in commit `d053a879b`. But the test case we had then seemingly didn't trigger this pqFlush-then-pqPutMsgEnd scenario, or at least we failed to recognize this variant of the bug. Bug: #18907 Reported-by: Dorjpalam Batbaatar <htgn.dbat.95@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18907-d41b9bcf6f29edda@postgresql.org Backpatch-through: 13	7 months ago
Robert Haas	a4b9707c41	pg_prewarm: Allow autoprewarm to use more than 1GB to dump blocks. Reported-by: Daria Shanina <vilensipkdm@gmail.com> Author: Daria Shanina <vilensipkdm@gmail.com> Author: Robert Haas <robertmhaas@gmail.com> Backpatch-through: 13	7 months ago
Tom Lane	09498d2f2c	Doc: you must own the target object to use SECURITY LABEL. For some reason this wasn't mentioned before. Author: Patrick Stählin <me@packi.ch> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/931e012a-57ba-41ba-9b88-24323a46dec5@packi.ch Backpatch-through: 13	7 months ago
Nathan Bossart	49584901ec	doc: Remove notes about "unencrypted" passwords. The documentation for the pg_authid system catalog and the pg_shadow system view indicates that passwords might be stored in cleartext, but that hasn't been possible for some time. Oversight in commit `eb61136dc7`. Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/aD2yKkZro4nbl5ol%40nathan Backpatch-through: 13	7 months ago
Tom Lane	eb42346475	Disallow "=" in names of reloptions and foreign-data options. We store values for these options as array elements with the syntax "name=value", hence a name containing "=" confuses matters when it's time to read the array back in. Since validation of the options is often done (long) after this conversion to array format, that leads to confusing and off-point error messages. We can improve matters by rejecting names containing "=" up-front. (Probably a better design would have involved pairs of array elements, but it's too late now --- and anyway, there's no evident use-case for option names like this. We already reject such names in some other contexts such as GUCs.) Reported-by: Chapman Flack <jcflack@acm.org> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Chapman Flack <jcflack@acm.org> Discussion: https://postgr.es/m/6830EB30.8090904@acm.org Backpatch-through: 13	7 months ago
Tom Lane	d4556f592e	Run pgindent on the previous commit. Clean up after rearranging PG_TRY blocks. Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/2954090.1748723636@sss.pgh.pa.us Backpatch-through: 13	7 months ago

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