pgsql: Drop slot's LWLock before returning from SaveSlotToPath()

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pgsql: Drop slot's LWLock before returning from SaveSlotToPath()

Peter Eisentraut-3
Drop slot's LWLock before returning from SaveSlotToPath()

When SaveSlotToPath() is called with elevel=LOG, the early exits didn't
release the slot's io_in_progress_lock.

This could result in a walsender being stuck on the lock forever.  A
possible way to get into this situation is if the offending code paths
are triggered in a low disk space situation.

Author: Pavan Deolasee <[hidden email]>
Reported-by: Craig Ringer <[hidden email]>
Discussion: https://www.postgresql.org/message-id/flat/56a138c5-de61-f553-7e8f-6789296de785%402ndquadrant.com

Branch
------
REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ce28a43ffa89b49584e75d6bb9f8ae03a8e13151

Modified Files
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src/backend/replication/slot.c | 9 +++++++++
1 file changed, 9 insertions(+)