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The LWLock used by this test module was defined as a process-local
variable, which was broken under -DEXEC_BACKEND, each backend getting
its own copy of the lock state. The shmem_startup_hook unconditionally
called LWLockRegisterTranche() and LWLockInitialize(), which means that
every backend would allocate a new tranche ID (which is still OK for
this module) but reset the lock's atomic state (which was bad).
This commit moves the LWLock to shared memory, so as it is initialized
only once, similarly to pg_prewarm/autoprewarm.c.
This change is only for REL_16_STABLE, per a report from buildfarm
member gokiburi (the system has been upgraded recently, so perhaps it
began failing due to some ALSR changes?). I have been able to reproduce
the problem on the same host with -DEXEC_BACKEND, and checked that this
commit addresses the issue. In v17 and v18, the test module wastes
tranche IDs, which only impacts the visibility of the locks like in
pg_stat_activity. The use of the SLRU bank locks ensures that the
LWLock state is safe. On HEAD, the logic of the module is safer thanks
to
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.