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The worker might have not started yet or it may never start,because its registration was cancelled due to worker limit.This commit adds a check for NULL value of pgws_collector_hdr->latch.The previous usage in pg_wait_sampling.c has such a check, weshould do the same here.
Воспроизведение. Можно запускать в любой директории, создается временный докер-контейнер. #!/bin/bashsudo docker run --rm -i ubuntu:24.04 bash<<"EOF"set -xeapt-get updateapt-get install -y \ git build-essential pkg-config libicu-dev libipc-run-perl \ flex bison libreadline-dev libz-dev gettext libperl-devgit clone -b REL_17_5 --depth 1 https://github.com/postgres/postgrescd postgresgit clone https://github.com/postgrespro/pg_wait_sampling contrib/pg_wait_samplingmkdir contrib/pgws_reproducecat - > contrib/pgws_reproduce/Makefile <<"_EOF"MODULE_big = pgws_reproduceOBJS = main.oEXTENSION = pgws_reproduceREGRESS =subdir = contrib/pgws_reproducetop_builddir = ../..include $(top_builddir)/src/Makefile.globalinclude $(top_srcdir)/contrib/contrib-global.mk_EOFcat - > contrib/pgws_reproduce/pgws_reproduce.control <<"_EOF" pg_wait_sampling extensioncomment = 'reproduce bug'default_version = '1'module_pathname = '$libdir/pgws_reproduce'relocatable = true_EOFcat - > contrib/pgws_reproduce/main.c <<"_EOF"#include "postgres.h"#include "postmaster/bgworker.h"#include "fmgr.h"#include <sched.h> /* Only works on linux. */PG_MODULE_MAGIC;void pgws_reproduce_worker_main(Datum main_arg);void _PG_init(void);void pgws_reproduce_worker_main(Datum main_arg) { while (true) { sched_yield(); }}void _PG_init(void) { /* Default limit of workers is 8. */ for (int i = 0; i < 32; ++i) { BackgroundWorker worker; memset(&worker, 0, sizeof(worker)); worker.bgw_restart_time = 1; worker.bgw_flags = BGWORKER_SHMEM_ACCESS; snprintf(worker.bgw_library_name, BGW_MAXLEN, "pgws_reproduce"); snprintf(worker.bgw_function_name, BGW_MAXLEN, CppAsString(pgws_reproduce_worker_main)); worker.bgw_main_arg = (Datum) 0; RegisterBackgroundWorker(&worker); }}_EOFgrep -v '$(recurse' contrib/Makefile > output.txtmv output.txt contrib/Makefileecho 'SUBDIRS += pg_wait_sampling pgws_reproduce' >> contrib/Makefileecho -e '$(recurse)\n$(recurse_always)' >> contrib/MakefileCFLAGS='-ggdb -O0 -g' ./configure -q \ --enable-cassert --enable-tap-tests --enable-nls \ --with-icu --with-perl --prefix=$(pwd)/installmake -s -j$(nproc) world-binmake -s -j$(nproc) install-world-binuseradd postgreschown -R postgres .cd installsu postgres -c 'bin/initdb -D data'su postgres -c "echo \"shared_preload_libraries = 'pgws_reproduce, pg_wait_sampling'\" > data/postgresql.conf"su postgres -c 'bin/pg_ctl -D data -l logfile start' || (cat logfile; exit 1)cd ..su postgres -c 'make -C contrib/pg_wait_sampling installcheck' || (grep '(PID ' install/logfile; exit 2)cat install/logfileEOF |
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The worker might have not started yet or it may never start, because its registration was cancelled due to worker limit.
This commit adds a check for NULL value of pgws_collector_hdr->latch. The previous usage in pg_wait_sampling.c has such a check, we should do the same here.