Fix WAIT FOR LSN cleanup on subtransaction abort
WAIT FOR LSN registers the current backend in shared memory before entering an
interruptible wait loop. Top-level abort and backend exit already call
WaitLSNCleanup(), but subtransaction abort did not. If an interrupt, such as
statement_timeout, occurred while waiting inside a savepoint, rolling back to
the savepoint left the backend marked as present in the WAIT FOR LSN heap.
Clean up WAIT FOR LSN state from AbortSubTransaction() as well, and add
a TAP test covering reuse of WAIT FOR LSN after a savepoint rollback.
Reported-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Discussion: https://postgr.es/m/CAJTYsWXDRwo-RVRaQgwxVcXgURVFeX8BKnijQrPiPcSCkDDX9A%40mail.gmail.com
Author: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Author: Xuneng Zhou <xunengzhou@gmail.com>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
Branch
------
master
Details
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https://git.postgresql.org/pg/commitdiff/5cdec423193cb99b502816197395637120256f0d
Modified Files
--------------
src/backend/access/transam/xact.c | 5 ++++
src/backend/access/transam/xlogwait.c | 2 +-
src/test/recovery/t/049_wait_for_lsn.pl | 48 +++++++++++++++++++++++++++++++++
3 files changed, 54 insertions(+), 1 deletion(-)
