From a05f40ef874b95a39471db68a313076cd94e256f Mon Sep 17 00:00:00 2001 From: Thomas Munro Date: Fri, 15 Jul 2022 01:23:29 +1200 Subject: [PATCH] Don't clobber postmaster sigmask in dsm_impl_resize. Commit 4518c798 intended to block signals in regular backends that allocate DSM segments, but dsm_impl_resize() is also reached by dsm_postmaster_startup(). It's not OK to clobber the postmaster's signal mask, so only manipulate the signal mask when under the postmaster. Back-patch to all releases, like 4518c798. Discussion: https://postgr.es/m/CA%2BhUKGKNpK%3D2OMeea_AZwpLg7Bm4%3DgYWk7eDjZ5F6YbozfOf8w%40mail.gmail.com --- src/backend/storage/ipc/dsm_impl.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/src/backend/storage/ipc/dsm_impl.c b/src/backend/storage/ipc/dsm_impl.c index 69567fc5a2..c7e15c09a7 100644 --- a/src/backend/storage/ipc/dsm_impl.c +++ b/src/backend/storage/ipc/dsm_impl.c @@ -352,7 +352,8 @@ dsm_impl_posix_resize(int fd, off_t size) * allowed SIGUSR1 to interrupt us repeatedly (for example, due to recovery * conflicts), the retry loop might never succeed. */ - PG_SETMASK(&BlockSig); + if (IsUnderPostmaster) + PG_SETMASK(&BlockSig); /* Truncate (or extend) the file to the requested size. */ do @@ -390,9 +391,12 @@ dsm_impl_posix_resize(int fd, off_t size) } #endif /* HAVE_POSIX_FALLOCATE && __linux__ */ - save_errno = errno; - PG_SETMASK(&UnBlockSig); - errno = save_errno; + if (IsUnderPostmaster) + { + save_errno = errno; + PG_SETMASK(&UnBlockSig); + errno = save_errno; + } return rc; }