pgsql: Don't run atexit callbacks in quickdie signal handlers.
| От | Heikki Linnakangas |
|---|---|
| Тема | pgsql: Don't run atexit callbacks in quickdie signal handlers. |
| Дата | |
| Msg-id | E1fnRBS-0005cA-HW@gemulon.postgresql.org обсуждение исходный текст |
| Список | pgsql-committers |
Don't run atexit callbacks in quickdie signal handlers. exit() is not async-signal safe. Even if the libc implementation is, 3rd party libraries might have installed unsafe atexit() callbacks. After receiving SIGQUIT, we really just want to exit as quickly as possible, so we don't really want to run the atexit() callbacks anyway. The original report by Jimmy Yih was a self-deadlock in startup_die(). However, this patch doesn't address that scenario; the signal handling while waiting for the startup packet is more complicated. But at least this alleviates similar problems in the SIGQUIT handlers, like that reported by Asim R P later in the same thread. Backpatch to 9.3 (all supported versions). Discussion: https://www.postgresql.org/message-id/CAOMx_OAuRUHiAuCg2YgicZLzPVv5d9_H4KrL_OFsFP%3DVPekigA%40mail.gmail.com Branch ------ REL9_4_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/d5a9b706ea93a95d9359066488c33aee33a695bc Modified Files -------------- src/backend/postmaster/bgworker.c | 25 +++++++++---------------- src/backend/postmaster/bgwriter.c | 24 +++++++++--------------- src/backend/postmaster/checkpointer.c | 24 +++++++++--------------- src/backend/postmaster/startup.c | 24 +++++++++--------------- src/backend/postmaster/walwriter.c | 24 +++++++++--------------- src/backend/replication/walreceiver.c | 32 +++++++++++++------------------- src/backend/tcop/postgres.c | 32 +++++++++++++++++++------------- 7 files changed, 77 insertions(+), 108 deletions(-)
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