From: | Thomas Munro <tmunro(at)postgresql(dot)org> |
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To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Fix deadlock in heap_compute_xid_horizon_for_tuples(). |
Date: | 2019-04-01 20:31:53 |
Message-ID: | E1hB3az-0007aE-6O@gemulon.postgresql.org |
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Lists: | pgsql-committers |
Fix deadlock in heap_compute_xid_horizon_for_tuples().
We can't call code that uses syscache while we hold buffer locks
on a catalog relation. If passed such a relation, just fall back
to the general effective_io_concurrency GUC rather than trying to
look up the containing tablespace's IO concurrency setting.
We might find a better way to control prefetching in follow-up
work, but for now this is enough to avoid the deadlock introduced
by commit 558a9165e0.
Reviewed-by: Andres Freund
Diagnosed-by: Peter Geoghegan
Discussion: https://postgr.es/m/CA%2BhUKGLCwPF0S4Mk7S8qw%2BDK0Bq65LueN9rofAA3HHSYikW-Zw%40mail.gmail.com
Discussion: https://postgr.es/m/962831d8-c18d-180d-75fb-8b842e3a2742%40chrullrich.net
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/4fd05bb55b40a3c9dde2b19942f275fc31b5225a
Modified Files
--------------
src/backend/access/heap/heapam.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
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