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(-)
