pg.ddx.io pgsql-hackers@postgresql.org mailing list archive help / color / mirror / Atom feed From: Justin Pryzby <pryzby@telsasoft.com>
To: pgsql-hackers@lists.postgresql.org
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: David G. Johnston <david.g.johnston@gmail.com>
Cc: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Cc: Cary Huang <cary.huang@highgo.ca>
Cc: Maciek Sakrejda <m.sakrejda@gmail.com>
Cc: Shubham Khanna <khannashubham1197@gmail.com>
Subject: Re: warn if GUC set to an invalid shared library
Date: Sun, 7 Jan 2024 07:27:00 -0600
Message-ID: <ZZqmpB8a0CokcxwC@pryzbyj2023> (raw )
In-Reply-To: <ZKcg1w4FoYq/4M4V@telsasoft.com >
References: <20220722183557.GC7789@telsasoft.com >
<729940.1658516423@sss.pgh.pa.us >
<20220722191443.GE7789@telsasoft.com >
<734432.1658518007@sss.pgh.pa.us >
<20220902222458.GC31833@telsasoft.com >
<20221029174053.GA19704@telsasoft.com >
<CAOtHd0DXpECx=w556LQQQyMG7bRKSStsr=wyF=5PN3TBAW3nCg@mail.gmail.com >
<20221031133120.GO16921@telsasoft.com >
<20221101222634.GE16921@telsasoft.com >
<ZKcg1w4FoYq/4M4V@telsasoft.com >
On Fri, Jul 22, 2022 at 03:26:47PM -0400, Tom Lane wrote:
> Hmph. I wonder if we shouldn't change that, because it's a lie.
> The value isn't actually coming from the config file, at least
> not yet.
On Thu, Jul 06, 2023 at 03:15:20PM -0500, Justin Pryzby wrote:
> On Sat, Oct 29, 2022 at 10:40 AM Justin Pryzby <pryzby@telsasoft.com> wrote:
> > > > > On Fri, Sep 02, 2022 at 05:24:58PM -0500, Justin Pryzby wrote:
> > > > > > It caused no issue when I changed:
> > > > > >
> > > > > > /* Check that it's acceptable for the indicated parameter */
> > > > > > if (!parse_and_validate_value(record, name, value,
> > > > > > - PGC_S_FILE, ERROR,
> > > > > > + PGC_S_TEST, ERROR,
> > > > > > &newval, &newextra))
> > > > > >
> > > > > > I'm not sure where to go from here.
> > > > >
> > > > > I'm hoping for some guidance ; this simple change may be naive, but I'm not
> > > > > sure what a wider change would look like.
>
> I'm still hoping.
@cfbot: rebased
Attachments: download all (4 files, .tar.gz)
v8-0001-WIP-test-GUCs-from-ALTER-SYSTEM-as-PGC_S_TEST-not.patch (text/x-diff, 1.5K) download
From e983189c5ae64524f724f317f024d6938f6ad271 Mon Sep 17 00:00:00 2001
From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Fri, 22 Jul 2022 15:52:11 -0500
Subject: [PATCH v8 1/4] WIP: test GUCs from ALTER SYSTEM as PGC_S_TEST not
FILE
WIP: ALTER SYSTEM should use PGC_S_TEST rather than PGC_S_FILE
Since the value didn't come from a file. Or maybe we should have
another PGC_S_ value for this, or a flag for 'is a test'.
---
src/backend/utils/misc/guc.c | 2 +-
src/include/utils/guc.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 09353bb613a..0339d2bc722 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4701,7 +4701,7 @@ AlterSystemSetConfigFile(AlterSystemStmt *altersysstmt)
void *newextra = NULL;
if (!parse_and_validate_value(record, name, value,
- PGC_S_FILE, ERROR,
+ PGC_S_TEST, ERROR,
&newval, &newextra))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 109e7c5abbd..d0ac2fd4944 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -120,6 +120,7 @@ typedef enum
PGC_S_INTERACTIVE, /* dividing line for error reporting */
PGC_S_TEST, /* test per-database or per-user setting */
PGC_S_SESSION, /* SET command */
+ // PGC_S_TEST_FILE, /* test global cluster settings (ALTER SYSTEM) */
} GucSource;
/*
--
2.42.0
v8-0002-warn-when-setting-GUC-to-a-nonextant-library.patch (text/x-diff, 9.7K) download
From 790fc2db29d28c7d00dceaa3f1ca22919ba09213 Mon Sep 17 00:00:00 2001
From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Mon, 13 Dec 2021 08:42:38 -0600
Subject: [PATCH v8 2/4] warn when setting GUC to a nonextant library
Note that warnings shouldn't be issued during startup (only fatals):
$ ./tmp_install/usr/local/pgsql/bin/postgres -D ./testrun/regress/regress/tmp_check/data -c shared_preload_libraries=ab
2023-07-06 14:47:03.817 CDT postmaster[2608106] FATAL: could not access file "ab": No existe el archivo o el directorio
2023-07-06 14:47:03.817 CDT postmaster[2608106] CONTEXT: while loading shared libraries for setting "shared_preload_libraries"
---
src/backend/commands/variable.c | 95 +++++++++++++++++++
src/backend/utils/misc/guc_tables.c | 6 +-
src/include/utils/guc_hooks.h | 7 ++
.../unsafe_tests/expected/rolenames.out | 19 ++++
.../modules/unsafe_tests/sql/rolenames.sql | 13 +++
src/test/regress/expected/rules.out | 8 ++
6 files changed, 145 insertions(+), 3 deletions(-)
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 30efcd554ae..7109091440c 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -40,6 +40,7 @@
#include "utils/timestamp.h"
#include "utils/tzparser.h"
#include "utils/varlena.h"
+#include <unistd.h>
/*
* DATESTYLE
@@ -1234,3 +1235,97 @@ check_ssl(bool *newval, void **extra, GucSource source)
#endif
return true;
}
+
+
+/*
+ * See also load_libraries() and internal_load_library().
+ */
+static bool
+check_preload_libraries(char **newval, void **extra, GucSource source,
+ bool restricted)
+{
+ char *rawstring;
+ List *elemlist;
+ ListCell *l;
+
+ /* nothing to do if empty */
+ if (newval == NULL || *newval[0] == '\0')
+ return true;
+
+ /*
+ * issue warnings only during an interactive SET, from ALTER
+ * ROLE/DATABASE/SYSTEM.
+ */
+ if (source != PGC_S_TEST)
+ return true;
+
+ /* Need a modifiable copy of string */
+ rawstring = pstrdup(*newval);
+
+ /* Parse string into list of filename paths */
+ if (!SplitDirectoriesString(rawstring, ',', &elemlist))
+ {
+ /* Should not happen ? */
+ return false;
+ }
+
+ foreach(l, elemlist)
+ {
+ /* Note that filename was already canonicalized */
+ char *filename = (char *) lfirst(l);
+ char *expanded = NULL;
+
+ /* If restricting, insert $libdir/plugins if not mentioned already */
+ if (restricted && first_dir_separator(filename) == NULL)
+ {
+ expanded = psprintf("$libdir/plugins/%s", filename);
+ filename = expanded;
+ }
+
+ /*
+ * stat()/access() only check that the library exists, not that it has
+ * the correct magic number or even a library. But error messages
+ * from dlopen() are not portable, so it'd be hard to report any
+ * problem other than "does not exist".
+ */
+ if (access(filename, R_OK) == 0)
+ continue;
+
+ if (source == PGC_S_FILE)
+ /* ALTER SYSTEM */
+ ereport(WARNING,
+ errcode_for_file_access(),
+ errmsg("could not access file \"%s\"", filename),
+ errdetail("The server will currently fail to start with this setting."),
+ errhint("If the server is shut down, it will be necessary to manually edit the %s file to allow it to start again.",
+ "postgresql.auto.conf"));
+ else
+ /* ALTER ROLE/DATABASE */
+ ereport(WARNING,
+ errcode_for_file_access(),
+ errmsg("could not access file \"%s\"", filename),
+ errdetail("New sessions will currently fail to connect with the new setting."));
+ }
+
+ list_free_deep(elemlist);
+ pfree(rawstring);
+ return true;
+}
+
+bool
+check_shared_preload_libraries(char **newval, void **extra, GucSource source)
+{
+ return check_preload_libraries(newval, extra, source, true);
+}
+
+bool
+check_local_preload_libraries(char **newval, void **extra, GucSource source)
+{
+ return check_preload_libraries(newval, extra, source, false);
+}
+
+bool
+check_session_preload_libraries(char **newval, void **extra, GucSource source)
+{
+ return check_preload_libraries(newval, extra, source, true);
+}
diff --git a/src/backend/utils/misc/guc_tables.c b/src/backend/utils/misc/guc_tables.c
index f89f148ff3c..2509167b2d4 100644
--- a/src/backend/utils/misc/guc_tables.c
+++ b/src/backend/utils/misc/guc_tables.c
@@ -4161,7 +4161,7 @@ struct config_string ConfigureNamesString[] =
},
&session_preload_libraries_string,
"",
- NULL, NULL, NULL
+ check_session_preload_libraries, NULL, NULL
},
{
@@ -4172,7 +4172,7 @@ struct config_string ConfigureNamesString[] =
},
&shared_preload_libraries_string,
"",
- NULL, NULL, NULL
+ check_shared_preload_libraries, NULL, NULL
},
{
@@ -4183,7 +4183,7 @@ struct config_string ConfigureNamesString[] =
},
&local_preload_libraries_string,
"",
- NULL, NULL, NULL
+ check_local_preload_libraries, NULL, NULL
},
{
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 5300c44f3b0..870006a83fe 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -163,4 +163,11 @@ extern void assign_wal_consistency_checking(const char *newval, void *extra);
extern bool check_wal_segment_size(int *newval, void **extra, GucSource source);
extern void assign_wal_sync_method(int new_wal_sync_method, void *extra);
+extern bool check_local_preload_libraries(char **newval, void **extra,
+ GucSource source);
+extern bool check_session_preload_libraries(char **newval, void **extra,
+ GucSource source);
+extern bool check_shared_preload_libraries(char **newval, void **extra,
+ GucSource source);
+
#endif /* GUC_HOOKS_H */
diff --git a/src/test/modules/unsafe_tests/expected/rolenames.out b/src/test/modules/unsafe_tests/expected/rolenames.out
index 291dd9f8d53..28c2d382595 100644
--- a/src/test/modules/unsafe_tests/expected/rolenames.out
+++ b/src/test/modules/unsafe_tests/expected/rolenames.out
@@ -1099,6 +1099,25 @@ ERROR: permission denied to examine "session_preload_libraries"
DETAIL: Only roles with privileges of the "pg_read_all_settings" role may examine this parameter.
ROLLBACK;
REVOKE pg_read_all_settings FROM regress_role_haspriv;
+-- test some warnings
+ALTER ROLE regress_testrol0 SET session_preload_libraries="DoesNotExist";
+WARNING: could not access file "$libdir/plugins/DoesNotExist"
+DETAIL: New sessions will currently fail to connect with the new setting.
+ALTER ROLE regress_testrol0 SET local_preload_libraries="DoesNotExist";
+WARNING: could not access file "DoesNotExist"
+DETAIL: New sessions will currently fail to connect with the new setting.
+CREATE DATABASE regression_nosuch_db;
+ALTER DATABASE regression_nosuch_db SET session_preload_libraries="DoesNotExist";
+WARNING: could not access file "$libdir/plugins/DoesNotExist"
+DETAIL: New sessions will currently fail to connect with the new setting.
+ALTER DATABASE regression_nosuch_db SET local_preload_libraries="DoesNotExist";
+WARNING: could not access file "DoesNotExist"
+DETAIL: New sessions will currently fail to connect with the new setting.
+DROP DATABASE regression_nosuch_db;
+-- SET doesn't do anything, but should not warn, either
+SET session_preload_libraries="DoesNotExist";
+SET SESSION session_preload_libraries="DoesNotExist";
+begin; SET LOCAL session_preload_libraries="DoesNotExist"; rollback;
-- clean up
\c
DROP SCHEMA test_roles_schema;
diff --git a/src/test/modules/unsafe_tests/sql/rolenames.sql b/src/test/modules/unsafe_tests/sql/rolenames.sql
index cf72aaf13a3..d957fd3dd0e 100644
--- a/src/test/modules/unsafe_tests/sql/rolenames.sql
+++ b/src/test/modules/unsafe_tests/sql/rolenames.sql
@@ -503,6 +503,19 @@ ROLLBACK;
REVOKE pg_read_all_settings FROM regress_role_haspriv;
+-- test some warnings
+ALTER ROLE regress_testrol0 SET session_preload_libraries="DoesNotExist";
+ALTER ROLE regress_testrol0 SET local_preload_libraries="DoesNotExist";
+CREATE DATABASE regression_nosuch_db;
+ALTER DATABASE regression_nosuch_db SET session_preload_libraries="DoesNotExist";
+ALTER DATABASE regression_nosuch_db SET local_preload_libraries="DoesNotExist";
+DROP DATABASE regression_nosuch_db;
+
+-- SET doesn't do anything, but should not warn, either
+SET session_preload_libraries="DoesNotExist";
+SET SESSION session_preload_libraries="DoesNotExist";
+begin; SET LOCAL session_preload_libraries="DoesNotExist"; rollback;
+
-- clean up
\c
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index d878a971df9..7ef2fdf768b 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -3486,6 +3486,14 @@ CREATE FUNCTION func_with_set_params() RETURNS integer
SET datestyle to iso, mdy
SET local_preload_libraries TO "Mixed/Case", 'c:/''a"/path', '', '0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'
IMMUTABLE STRICT;
+WARNING: could not access file "Mixed/Case"
+DETAIL: New sessions will currently fail to connect with the new setting.
+WARNING: could not access file "c:/'a"/path"
+DETAIL: New sessions will currently fail to connect with the new setting.
+WARNING: could not access file ""
+DETAIL: New sessions will currently fail to connect with the new setting.
+WARNING: could not access file "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"
+DETAIL: New sessions will currently fail to connect with the new setting.
SELECT pg_get_functiondef('func_with_set_params()'::regprocedure);
pg_get_functiondef
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--
2.42.0
v8-0003-errcontext-if-server-fails-to-start-due-to-librar.patch (text/x-diff, 4.5K) download
From 2bfff366b754b77815604a2916dd97f2971a5a4b Mon Sep 17 00:00:00 2001
From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Sat, 18 Dec 2021 22:51:01 -0600
Subject: [PATCH v8 3/4] errcontext if server fails to start due to library
GUCs
---
src/backend/utils/fmgr/dfmgr.c | 21 ++++++++++++++++-----
src/backend/utils/init/miscinit.c | 2 +-
src/include/fmgr.h | 1 +
3 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/src/backend/utils/fmgr/dfmgr.c b/src/backend/utils/fmgr/dfmgr.c
index 638eddf19f4..28082890bf0 100644
--- a/src/backend/utils/fmgr/dfmgr.c
+++ b/src/backend/utils/fmgr/dfmgr.c
@@ -75,7 +75,7 @@ static DynamicFileList *file_tail = NULL;
char *Dynamic_library_path;
-static void *internal_load_library(const char *libname);
+static void *internal_load_library(const char *libname, const char *gucname);
static void incompatible_module_error(const char *libname,
const Pg_magic_struct *module_magic_data) pg_attribute_noreturn();
static bool file_exists(const char *name);
@@ -113,7 +113,7 @@ load_external_function(const char *filename, const char *funcname,
fullname = expand_dynamic_library_name(filename);
/* Load the shared library, unless we already did */
- lib_handle = internal_load_library(fullname);
+ lib_handle = internal_load_library(fullname, NULL);
/* Return handle if caller wants it */
if (filehandle)
@@ -142,6 +142,15 @@ load_external_function(const char *filename, const char *funcname,
*/
void
load_file(const char *filename, bool restricted)
+{
+ load_file_guc(filename, restricted, NULL);
+}
+
+/*
+ * Also accepts a GUC arg, for error reports
+ */
+void
+load_file_guc(const char *filename, bool restricted, const char *gucname)
{
char *fullname;
@@ -153,7 +162,7 @@ load_file(const char *filename, bool restricted)
fullname = expand_dynamic_library_name(filename);
/* Load the shared library */
- (void) internal_load_library(fullname);
+ (void) internal_load_library(fullname, gucname);
pfree(fullname);
}
@@ -172,6 +181,7 @@ lookup_external_function(void *filehandle, const char *funcname)
/*
* Load the specified dynamic-link library file, unless it already is
* loaded. Return the pg_dl* handle for the file.
+ * gucname may be passed for error reports.
*
* Note: libname is expected to be an exact name for the library file.
*
@@ -181,7 +191,7 @@ lookup_external_function(void *filehandle, const char *funcname)
* perhaps other things that are definitely unsafe currently.
*/
static void *
-internal_load_library(const char *libname)
+internal_load_library(const char *libname, const char *gucname)
{
DynamicFileList *file_scanner;
PGModuleMagicFunction magic_func;
@@ -206,6 +216,7 @@ internal_load_library(const char *libname)
if (stat(libname, &stat_buf) == -1)
ereport(ERROR,
(errcode_for_file_access(),
+ gucname ? errcontext("while loading shared libraries for setting \"%s\"", gucname) : 0,
errmsg("could not access file \"%s\": %m",
libname)));
@@ -694,7 +705,7 @@ RestoreLibraryState(char *start_address)
{
while (*start_address != '\0')
{
- internal_load_library(start_address);
+ internal_load_library(start_address, NULL);
start_address += strlen(start_address) + 1;
}
}
diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c
index 23f77a59e58..a2322a25769 100644
--- a/src/backend/utils/init/miscinit.c
+++ b/src/backend/utils/init/miscinit.c
@@ -1821,7 +1821,7 @@ load_libraries(const char *libraries, const char *gucname, bool restricted)
expanded = psprintf("$libdir/plugins/%s", filename);
filename = expanded;
}
- load_file(filename, restricted);
+ load_file_guc(filename, restricted, gucname);
ereport(DEBUG1,
(errmsg_internal("loaded library \"%s\"", filename)));
if (expanded)
diff --git a/src/include/fmgr.h b/src/include/fmgr.h
index ccb4070a251..a2f6fa60196 100644
--- a/src/include/fmgr.h
+++ b/src/include/fmgr.h
@@ -745,6 +745,7 @@ extern void *load_external_function(const char *filename, const char *funcname,
bool signalNotFound, void **filehandle);
extern void *lookup_external_function(void *filehandle, const char *funcname);
extern void load_file(const char *filename, bool restricted);
+extern void load_file_guc(const char *filename, bool restricted, const char *gucname);
extern void **find_rendezvous_variable(const char *varName);
extern Size EstimateLibraryStateSpace(void);
extern void SerializeLibraryState(Size maxsize, char *start_address);
--
2.42.0
v8-0004-show-the-GUC-source-in-errcontext.patch (text/x-diff, 3.4K) download
From 002be0e6ed8cc4d00505cec5c3d9097571d93cfa Mon Sep 17 00:00:00 2001
From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Wed, 2 Feb 2022 20:54:49 -0600
Subject: [PATCH v8 4/4] show the GUC source in errcontext
//-os-only: freebsd
---
src/backend/utils/fmgr/dfmgr.c | 14 +++++++++++---
src/backend/utils/misc/guc_funcs.c | 26 ++++++++++++++++++++++++++
src/include/utils/guc.h | 1 +
3 files changed, 38 insertions(+), 3 deletions(-)
diff --git a/src/backend/utils/fmgr/dfmgr.c b/src/backend/utils/fmgr/dfmgr.c
index 28082890bf0..acbcaef7957 100644
--- a/src/backend/utils/fmgr/dfmgr.c
+++ b/src/backend/utils/fmgr/dfmgr.c
@@ -34,6 +34,7 @@
#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "storage/shmem.h"
+#include "utils/guc_tables.h"
#include "utils/hsearch.h"
@@ -214,11 +215,18 @@ internal_load_library(const char *libname, const char *gucname)
* Check for same files - different paths (ie, symlink or link)
*/
if (stat(libname, &stat_buf) == -1)
+ {
+ char *errstr = strerror(errno);
+ int linenum;
+ char *sourcefile = gucname ? GetConfigSourceFile(gucname, &linenum) : NULL;
+
ereport(ERROR,
(errcode_for_file_access(),
gucname ? errcontext("while loading shared libraries for setting \"%s\"", gucname) : 0,
- errmsg("could not access file \"%s\": %m",
- libname)));
+ sourcefile ? errcontext("from %s:%d", sourcefile, linenum) : 0,
+ errmsg("could not access file \"%s\": %s",
+ libname, errstr)));
+ }
for (file_scanner = file_list;
file_scanner != NULL &&
@@ -282,7 +290,7 @@ internal_load_library(const char *libname, const char *gucname)
}
else
{
- /* try to close library */
+ /* try to close library */ // Not needed due to ERROR ? //
dlclose(file_scanner->handle);
free(file_scanner);
/* complain */
diff --git a/src/backend/utils/misc/guc_funcs.c b/src/backend/utils/misc/guc_funcs.c
index 0ad7e6cf1f1..4229eb3a794 100644
--- a/src/backend/utils/misc/guc_funcs.c
+++ b/src/backend/utils/misc/guc_funcs.c
@@ -177,6 +177,32 @@ ExtractSetVariableArgs(VariableSetStmt *stmt)
}
}
+
+/*
+ * Get the source file and line associated with the given option, if it was set
+ * by a file.
+ *
+ * If the option doesn't exist, throw an ereport and don't return.
+ */
+char *
+GetConfigSourceFile(const char *name, int *linenum)
+{
+ struct config_generic *record;
+
+ record = find_option(name, false, false, ERROR);
+
+ /* Should not happen */
+ if (record == NULL)
+ return NULL;
+
+ if (record->source != PGC_S_FILE)
+ return NULL;
+
+ *linenum = record->sourceline;
+ return record->sourcefile;
+}
+
+
/*
* flatten_set_variable_args
* Given a parsenode List as emitted by the grammar for SET,
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index d0ac2fd4944..2bab6baadf0 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -367,6 +367,7 @@ extern const char *GetConfigOption(const char *name, bool missing_ok,
bool restrict_privileged);
extern const char *GetConfigOptionResetString(const char *name);
extern int GetConfigOptionFlags(const char *name, bool missing_ok);
+extern char *GetConfigSourceFile(const char *name, int *linenum);
extern void ProcessConfigFile(GucContext context);
extern char *convert_GUC_name_for_parameter_acl(const char *name);
extern void check_GUC_name_for_parameter_acl(const char *name);
--
2.42.0
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To: pgsql-hackers@postgresql.org
Cc: pryzby@telsasoft.com, pgsql-hackers@lists.postgresql.org, tgl@sss.pgh.pa.us, robertmhaas@gmail.com, david.g.johnston@gmail.com, bharath.rupireddyforpostgres@gmail.com, cary.huang@highgo.ca, m.sakrejda@gmail.com, khannashubham1197@gmail.com
Subject: Re: warn if GUC set to an invalid shared library
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