Don't send protocol messages to a shm_mq that no longer exists. Commit 2bd9e412f92bc6a68f3e8bcb18e04955cc35001d introduced a mechanism for relaying protocol messages from a background worker to another backend via a shm_mq. However, there was no provision for shutting down the communication channel. Therefore, a protocol message sent late in the shutdown sequence, such as a DEBUG message resulting from cranking up log_min_messages, could crash the server. To fix, install an on_dsm_detach callback that disables sending messages to the shm_mq when the associated DSM is detached.
Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/2ad5c27bb565c26a4b12ea3343331c80f121f269 Modified Files -------------- src/backend/access/transam/parallel.c | 2 +- src/backend/libpq/pqmq.c | 28 ++++++++++++++++++++++++++-- src/include/libpq/pqmq.h | 2 +- 3 files changed, 28 insertions(+), 4 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
