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 ------ master Details ------- 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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