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+-- Check that stack depth detection mechanism works and
+-- max_stack_depth is not set too high.
+create function infinite_recurse() returns int as
+'select infinite_recurse()' language sql;
+-- Unfortunately, up till mid 2020 the Linux kernel had a bug in PPC64
+-- signal handling that would cause this test to crash if it happened
+-- to receive an sinval catchup interrupt while the stack is deep:
+-- https://bugzilla.kernel.org/show_bug.cgi?id=205183
+-- It is likely to be many years before that bug disappears from all
+-- production kernels, so disable this test on such platforms.
+-- (We still create the function, so as not to have a cross-platform
+-- difference in the end state of the regression database.)
+SELECT version() ~ 'powerpc64[^,]*-linux-gnu'
+ AS skip_test \gset
+\if :skip_test
+\quit
+\endif
+-- The full error report is not very stable, so we show only SQLSTATE
+-- and primary error message.
+\set VERBOSITY sqlstate
+select infinite_recurse();
+ERROR: 54001
+\echo :LAST_ERROR_MESSAGE
+stack depth limit exceeded