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Tom Lane 3420851a2c Fix busted logic for parallel lock grouping in TopoSort(). ... A "break" statement erroneously left behind by commit a1c1af2a1 caused TopoSort to do the wrong thing if a lock's wait list contained multiple members of the same locking group. Because parallel workers don't normally need any locks not already taken by their leader, this is very hard --- maybe impossible --- to hit in production. Still, if it did happen, the queries involved in an otherwise-resolvable deadlock would block until canceled. In addition to removing the bogus "break", add an Assert showing that the conflicting uses of the beforeConstraints[] array (for both counts and flags) don't overlap, and add some commentary explaining why not; because it's not obvious without explanation, IMHO. Original report and patch from Rui Hai Jiang; additional assert and commentary by me. Back-patch to 9.6 where the bug came in. Discussion: https://postgr.es/m/CAEri+mLd3bpHLyW+a9pSe1y=aEkeuJpwBSwvo-+m4n7-ceRmXw@mail.gmail.com		6 years ago
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access	Fix inconsistencies and typos in the tree	6 years ago
bootstrap	Fix inconsistencies and typos in the tree	7 years ago
catalog	Fix inconsistencies and typos in the tree	6 years ago
commands	Fix inconsistencies and typos in the tree	6 years ago
executor	Fix slot type handling for Agg nodes performing internal sorts.	6 years ago
foreign	Update copyright for 2019	7 years ago
jit	Avoid macro clash with LLVM 9.	6 years ago
lib	Fix inconsistencies in the code	7 years ago
libpq	Fix inconsistencies and typos in the tree	6 years ago
main	Replace @postgresql.org with @lists.postgresql.org for mailinglists	7 years ago
nodes	Fix handling of expressions and predicates in REINDEX CONCURRENTLY	6 years ago
optimizer	Adjust overly strict Assert	7 years ago
parser	Make identity sequence management more robust	7 years ago
partitioning	Fix inconsistencies and typos in the tree	7 years ago
po	Translation updates	7 years ago
port	Fix inconsistencies and typos in the tree	7 years ago
postmaster	Fix inconsistencies and typos in the tree	6 years ago
regex	Phase 2 pgindent run for v12.	7 years ago
replication	Fix inconsistencies and typos in the tree	6 years ago
rewrite	Make identity sequence management more robust	7 years ago
snowball	Sync our Snowball stemmer dictionaries with current upstream	7 years ago
statistics	Use column collation for extended statistics	7 years ago
storage	Fix busted logic for parallel lock grouping in TopoSort().	6 years ago
tcop	Fix inconsistencies and typos in the tree	6 years ago
tsearch	Phase 2 pgindent run for v12.	7 years ago
utils	Fix inconsistencies and typos in the tree	6 years ago
.gitignore	…
Makefile	Get rid of jsonpath_gram.h and jsonpath_scanner.h	7 years ago
common.mk	Remove PARTIAL_LINKING build mode.	8 years ago
nls.mk	Translation updates	7 years ago