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Tom Lane 130beba36d Fix inadequate buffer locking in FSM and VM page re-initialization. ... When reading an existing FSM or VM page that was found to be corrupt by the buffer manager, the code applied PageInit() to reinitialize the page, but did so without any locking. There is thus a hazard that two backends might concurrently do PageInit, which in itself would still be OK, but the slower one might then zero over subsequent data changes applied by the faster one. Even that is unlikely to be fatal; but it's not desirable, so add locking to prevent it. This does not add any locking overhead in the normal code path where the page is OK. It's not immediately obvious that that's safe, but I believe it is, for reasons explained in the added comments. Problem noted by R P Asim. It's been like this for a long time, so back-patch to all supported branches. Discussion: https://postgr.es/m/CANXE4Te4G0TGq6cr0-TvwP0H4BNiK_-hB5gHe8mF+nz0mcYfMQ@mail.gmail.com		7 years ago
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buffer	Remove dubious micro-optimization in ckpt_buforder_comparator().	8 years ago
file	Fix memory leak in BufFileCreateShared().	7 years ago
freespace	Fix inadequate buffer locking in FSM and VM page re-initialization.	7 years ago
ipc	Reset shmem_exit_inprogress after shmem_exit()	7 years ago
large_object	Update copyright for 2018	8 years ago
lmgr	Re-think predicate locking on GIN indexes.	7 years ago
page	Revert "Allow on-line enabling and disabling of data checksums"	8 years ago
smgr	Improve the performance of relation deletes during recovery.	7 years ago
Makefile	Remove cvs keywords from all files.	15 years ago