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This removes a difference between the standard IsUnderPostmaster execution environment and that of --boot and --single. In a stand-alone backend, "SELECT random()" always started at the same seed. On a system capable of using posix shared memory, initdb could still conclude "selecting dynamic shared memory implementation ... sysv". Crashed --boot or --single postgres processes orphaned shared memory objects having names that collided with the not-actually-random names that initdb probed. The sysv fallback appeared after ten crashes of --boot or --single postgres. Since --boot and --single are rare in production use, systems used for PostgreSQL development are the principal candidate to notice this symptom. Back-patch to 9.3 (all supported versions). PostgreSQL 9.4 introduced dynamic shared memory, but 9.3 does share the "SELECT random()" problem. Reviewed by Tom Lane and Kyotaro HORIGUCHI. Discussion: https://postgr.es/m/20180915221546.GA3159382@rfd.leadboat.com |
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| pg_basebackup | ||
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| pg_controldata | ||
| pg_ctl | ||
| pg_dump | ||
| pg_resetwal | ||
| pg_rewind | ||
| pg_test_fsync | ||
| pg_test_timing | ||
| pg_upgrade | ||
| pg_verify_checksums | ||
| pg_waldump | ||
| pgbench | ||
| pgevent | ||
| psql | ||
| scripts | ||
| Makefile | ||