postgres

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Thomas Munro 1d93d18045 Fix race in dsm_unpin_segment() when handles are reused.

Teach dsm_unpin_segment() to skip segments that are in the process
of being destroyed by another backend, when searching for a handle.
Such a segment cannot possibly be the one we are looking for, even
if its handle matches.  Another slot might hold a recently created
segment that has the same handle value by coincidence, and we need
to keep searching for that one.

The bug caused rare "cannot unpin a segment that is not pinned"
errors on 10 and 11.  Similar to commit 6c0fb941 for dsm_attach().

Back-patch to 10, where dsm_unpin_segment() landed.

Author: Thomas Munro
Reported-by: Justin Pryzby
Tested-by: Justin Pryzby (along with other recent DSA/DSM fixes)
Discussion: https://postgr.es/m/20190216023854.GF30291@telsasoft.com

2019-02-18 09:59:27 +13:00

buffer

Remove dubious micro-optimization in ckpt_buforder_comparator().

2018-01-10 15:50:54 -05:00

file

Have BufFileSize() ereport() on FileSize() failure.

2018-11-28 14:42:52 -08:00

freespace

Avoid using potentially-under-aligned page buffers.

2018-09-01 15:27:13 -04:00

ipc

Fix race in dsm_unpin_segment() when handles are reused.