From 6b6bf90f1190dd49eafdfd1475a7c597fcfd108c Mon Sep 17 00:00:00 2001 From: Evgeniy Gorbanyov Date: Wed, 11 Nov 2026 14:23:50 +0600 Subject: [PATCH] Distinguish EOF from a read error when loading the relcache init file load_relcache_init_file() treats a zero-length fread() of the next relation descriptor length as the end of pg_internal.init, which has no record count. fread() also returns zero when a read error transfers no data. In that case the file is accepted whenever the nailed rel and index counts already match, so a partial cache can be installed instead of bootstrapping it from the built-in descriptors. Check ferror() before treating a zero-length read as the end of the file. Signed-off-by: Evgeniy Gorbanyov --- src/backend/utils/cache/relcache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c index 07868bafee2..cdd33306ed7 100644 --- a/src/backend/utils/cache/relcache.c +++ b/src/backend/utils/cache/relcache.c @@ -6329,7 +6329,7 @@ load_relcache_init_file(bool shared) nread = fread(&len, 1, sizeof(len), fp); if (nread != sizeof(len)) { - if (nread == 0) + if (nread == 0 && !ferror(fp)) break; /* end of file */ goto read_failed; } -- 2.50.1