Re: Small query using LATERAL that segfaults Postgres - Mailing list pgsql-bugs
| From | Pavel Stehule |
|---|---|
| Subject | Re: Small query using LATERAL that segfaults Postgres |
| Date | |
| Msg-id | CAFj8pRAvA7tSRftHghGAwrZ4=oHzGNHL+PuHmer8TzbRHQmNTg@mail.gmail.com Whole thread Raw |
| In response to | Small query using LATERAL that segfaults Postgres (Tom Ellis <tom-lists-postgresql.org@jaguarpaw.co.uk>) |
| List | pgsql-bugs |
po 13. 7. 2020 v 20:06 odesílatel Tom Ellis <tom-lists-postgresql.org@jaguarpaw.co.uk> napsal:
This small query seems to segfault Postgres. I've tried on the
version of Postgres 11 that comes with Debian Stable and all versions
on https://www.db-fiddle.com/ including 13 (Beta). DB Fiddle actually
says "An unexpected error occurred." but I suspect that's the
segfault.
Tom
SELECT
0
FROM (SELECT
TRUE as "r",
SUM(0)
) as "T1",
LATERAL
(SELECT TRUE as "b"
UNION ALL
SELECT
"r" as "b"
FROM (SELECT 0 ORDER BY COALESCE(0)) as "T1"
) as "T2"
WHERE "b"
here is stacktrace
Program received signal SIGABRT, Aborted.
0x00007f269e6e9a25 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: dnf debuginfo-install libgcc-10.1.1-1.fc32.x86_64
(gdb) bt
#0 0x00007f269e6e9a25 in raise () from /lib64/libc.so.6
#1 0x00007f269e6d2895 in abort () from /lib64/libc.so.6
#2 0x000000000090340b in ExceptionalCondition (conditionName=conditionName@entry=0xa55fef "var->varno == rti",
errorType=errorType@entry=0x959029 "FailedAssertion", fileName=fileName@entry=0xa55f10 "allpaths.c",
lineNumber=lineNumber@entry=3532) at assert.c:67
#3 0x00000000006e3041 in qual_is_pushdown_safe (subquery=0x2b7cc40, safetyInfo=0x7ffcc3355530, qual=0x2b7a998, rti=6)
at allpaths.c:3532
#4 set_subquery_pathlist (rte=0x2b77258, rti=<optimized out>, rel=0x2b7a5e0, root=0x2b6fdb0) at allpaths.c:2262
#5 set_rel_size (root=root@entry=0x2b6fdb0, rel=rel@entry=0x2b7a5e0, rti=rti@entry=6, rte=rte@entry=0x2b77258) at allpaths.c:422
#6 0x00000000006e2101 in set_append_rel_size (rte=0x2b77258, rti=2, rel=0x2b6e850, root=0x2b798a0) at allpaths.c:1111
#7 set_rel_size (root=root@entry=0x2b6fdb0, rel=rel@entry=0x2b6e850, rti=rti@entry=2, rte=rte@entry=0x2b68098) at allpaths.c:383
#8 0x00000000006e4ea0 in set_base_rel_sizes (root=<optimized out>) at allpaths.c:323
#9 make_one_rel (root=root@entry=0x2b6fdb0, joinlist=joinlist@entry=0x2b79f08) at allpaths.c:185
#10 0x0000000000709b69 in query_planner (root=root@entry=0x2b6fdb0, qp_callback=qp_callback@entry=0x70a240 <standard_qp_callback>,
qp_extra=qp_extra@entry=0x7ffcc33557a0) at planmain.c:269
#11 0x000000000070edfb in grouping_planner (root=<optimized out>, inheritance_update=false, tuple_fraction=<optimized out>)
at planner.c:2058
#12 0x0000000000711907 in subquery_planner (glob=glob@entry=0x2b67ac8, parse=parse@entry=0x2b67be0,
parent_root=parent_root@entry=0x0, hasRecursion=hasRecursion@entry=false, tuple_fraction=tuple_fraction@entry=0)
at planner.c:1015
#13 0x0000000000712cbb in standard_planner (parse=0x2b67be0, query_string=<optimized out>, cursorOptions=256,
boundParams=<optimized out>) at planner.c:405
#14 0x00000000007dd4a8 in pg_plan_query (querytree=0x2b67be0,
query_string=query_string@entry=0x2aa23f0 "SELECT\n0\nFROM (SELECT\n TRUE as \"r\",\n SUM(0)\n ) as \"T1\",\nLATERAL\n(SELECT TRUE as \"b\"\n UNION ALL\n SELECT\n \"r\" as \"b\"\n FROM (SELECT 0 ORDER BY COALESCE(0)) as \""..., cursorOptions=cursorOptions@entry=256, boundParams=boundParams@entry=0x0) at postgres.c:875
#15 0x00000000007dd5a1 in pg_plan_queries (querytrees=0x2b6fd58,
query_string=query_string@entry=0x2aa23f0 "SELECT\n0\nFROM (SELECT\n TRUE as \"r\",\n SUM(0)\n ) as \"T1\",\nLATERAL\n(SELECT TRUE as \"b\"\n UNION ALL\n SELECT\n \"r\" as \"b\"\n FROM (SELECT 0 ORDER BY COALESCE(0)) as \""..., cursorOptions=cursorOptions@entry=256, boundParams=boundParams@entry=0x0) at postgres.c:966
#16 0x00000000007dd8f8 in exec_simple_query (
query_string=0x2aa23f0 "SELECT\n0\nFROM (SELECT\n TRUE as \"r\",\n SUM(0)\n ) as \"T1\",\nLATERAL\n(SELECT TRUE as \"b\"\n UNION ALL\n SELECT\n \"r\" as \"b\"\n FROM (SELECT 0 ORDER BY COALESCE(0)) as \""...)
at postgres.c:1158
#17 0x00000000007df755 in PostgresMain (argc=<optimized out>, argv=argv@entry=0x2ad06e8, dbname=<optimized out>,
username=<optimized out>) at postgres.c:4315
#18 0x00000000007579e9 in BackendRun (port=0x2ac6fe0) at postmaster.c:4523
0x00007f269e6e9a25 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: dnf debuginfo-install libgcc-10.1.1-1.fc32.x86_64
(gdb) bt
#0 0x00007f269e6e9a25 in raise () from /lib64/libc.so.6
#1 0x00007f269e6d2895 in abort () from /lib64/libc.so.6
#2 0x000000000090340b in ExceptionalCondition (conditionName=conditionName@entry=0xa55fef "var->varno == rti",
errorType=errorType@entry=0x959029 "FailedAssertion", fileName=fileName@entry=0xa55f10 "allpaths.c",
lineNumber=lineNumber@entry=3532) at assert.c:67
#3 0x00000000006e3041 in qual_is_pushdown_safe (subquery=0x2b7cc40, safetyInfo=0x7ffcc3355530, qual=0x2b7a998, rti=6)
at allpaths.c:3532
#4 set_subquery_pathlist (rte=0x2b77258, rti=<optimized out>, rel=0x2b7a5e0, root=0x2b6fdb0) at allpaths.c:2262
#5 set_rel_size (root=root@entry=0x2b6fdb0, rel=rel@entry=0x2b7a5e0, rti=rti@entry=6, rte=rte@entry=0x2b77258) at allpaths.c:422
#6 0x00000000006e2101 in set_append_rel_size (rte=0x2b77258, rti=2, rel=0x2b6e850, root=0x2b798a0) at allpaths.c:1111
#7 set_rel_size (root=root@entry=0x2b6fdb0, rel=rel@entry=0x2b6e850, rti=rti@entry=2, rte=rte@entry=0x2b68098) at allpaths.c:383
#8 0x00000000006e4ea0 in set_base_rel_sizes (root=<optimized out>) at allpaths.c:323
#9 make_one_rel (root=root@entry=0x2b6fdb0, joinlist=joinlist@entry=0x2b79f08) at allpaths.c:185
#10 0x0000000000709b69 in query_planner (root=root@entry=0x2b6fdb0, qp_callback=qp_callback@entry=0x70a240 <standard_qp_callback>,
qp_extra=qp_extra@entry=0x7ffcc33557a0) at planmain.c:269
#11 0x000000000070edfb in grouping_planner (root=<optimized out>, inheritance_update=false, tuple_fraction=<optimized out>)
at planner.c:2058
#12 0x0000000000711907 in subquery_planner (glob=glob@entry=0x2b67ac8, parse=parse@entry=0x2b67be0,
parent_root=parent_root@entry=0x0, hasRecursion=hasRecursion@entry=false, tuple_fraction=tuple_fraction@entry=0)
at planner.c:1015
#13 0x0000000000712cbb in standard_planner (parse=0x2b67be0, query_string=<optimized out>, cursorOptions=256,
boundParams=<optimized out>) at planner.c:405
#14 0x00000000007dd4a8 in pg_plan_query (querytree=0x2b67be0,
query_string=query_string@entry=0x2aa23f0 "SELECT\n0\nFROM (SELECT\n TRUE as \"r\",\n SUM(0)\n ) as \"T1\",\nLATERAL\n(SELECT TRUE as \"b\"\n UNION ALL\n SELECT\n \"r\" as \"b\"\n FROM (SELECT 0 ORDER BY COALESCE(0)) as \""..., cursorOptions=cursorOptions@entry=256, boundParams=boundParams@entry=0x0) at postgres.c:875
#15 0x00000000007dd5a1 in pg_plan_queries (querytrees=0x2b6fd58,
query_string=query_string@entry=0x2aa23f0 "SELECT\n0\nFROM (SELECT\n TRUE as \"r\",\n SUM(0)\n ) as \"T1\",\nLATERAL\n(SELECT TRUE as \"b\"\n UNION ALL\n SELECT\n \"r\" as \"b\"\n FROM (SELECT 0 ORDER BY COALESCE(0)) as \""..., cursorOptions=cursorOptions@entry=256, boundParams=boundParams@entry=0x0) at postgres.c:966
#16 0x00000000007dd8f8 in exec_simple_query (
query_string=0x2aa23f0 "SELECT\n0\nFROM (SELECT\n TRUE as \"r\",\n SUM(0)\n ) as \"T1\",\nLATERAL\n(SELECT TRUE as \"b\"\n UNION ALL\n SELECT\n \"r\" as \"b\"\n FROM (SELECT 0 ORDER BY COALESCE(0)) as \""...)
at postgres.c:1158
#17 0x00000000007df755 in PostgresMain (argc=<optimized out>, argv=argv@entry=0x2ad06e8, dbname=<optimized out>,
username=<optimized out>) at postgres.c:4315
#18 0x00000000007579e9 in BackendRun (port=0x2ac6fe0) at postmaster.c:4523
Regards
Pavel
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