Postgres crash when using uuid and explain

[ludobrands]

Hi,

encountering multiple connection crashes when working with uuid. Reduced it to it's simplest case:

cassandra@cqlsh> create table stats.messages (message_guid uuid PRIMARY KEY, from_domain text);

postgres=# \d+ message
                         Table "public.message"
    Column    | Type | Modifiers | Storage  | Stats target | Description 
--------------+------+-----------+----------+--------------+-------------
 message_guid | uuid | not null  | plain    |              | 
 domain       | text |           | extended |              | 
Indexes:
    "message_pkey" PRIMARY KEY, btree (message_guid)

select * from fdw_stats.messages where message_guid in ('5f6ff794-bff6-4404-96ea-ed4faefb812a','45fd83f9-6fc8-4dc2-9b4a-bdfef6bb6cf2');
works fine. But
explain select * from fdw_stats.messages where message_guid in ('5f6ff794-bff6-4404-96ea-ed4faefb812a','45fd83f9-6fc8-4dc2-9b4a-bdfef6bb6cf2');
crashes the server process. The only log I found is in /var/log/syslog:
kernel: [5994562.576860] postgres[14200]: segfault at 0 ip 0000558b194c77ba sp 00007fffcbaacfd0 error 4 in postgres[558b190c1000+64c000]

Enabled ISDEBUG but that doesn't seem to help a lot:

postgres=# explain select * from fdw_stats.messages c join message p on (p.message_guid = c.message_guid);
NOTICE:  begin: 0
NOTICE:  rowid requested
NOTICE:  path keys: [((u'message_guid',), 1), (u'message_guid', 10000), (u'from_domain', 10000), (u'__rowid__', 1)]
server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
!>

It is linked to the uuid since
explain select * from message m join fdw_stats.messages c on (m.domain=c.from_domain);
works just fine

Strangely enough, explain analyze of the same failing query does work:

postgres=# explain analyze select * from fdw_stats.messages c join message p on (p.message_guid = c.message_guid);
NOTICE:  begin: 0
NOTICE:  rowid requested
NOTICE:  path keys: [((u'message_guid',), 1), (u'message_guid', 10000), (u'from_domain', 10000), (u'__rowid__', 1)]
NOTICE:  building select statement... Quals: [message_guid = 1cc882db-f453-4af5-8289-205a2d5c4182], columns: set(['from_domain', 'message_guid', '__rowid__']), sortkeys: None, allow filtering: False
NOTICE:  qual field message_guid; qual index 1; qual type <type 'unicode'>; qual operator: =; qual value 1cc882db-f453-4af5-8289-205a2d5c4182
NOTICE:  CQL query: SELECT "from_domain","message_guid" FROM stats.messages WHERE  message_guid = %s 
NOTICE:  executing statement...
NOTICE:  cursor got in 6.60181045532 ms
NOTICE:  building select statement... Quals: [message_guid = 5f6ff794-bff6-4404-96ea-ed4faefb812a], columns: set(['from_domain', 'message_guid', '__rowid__']), sortkeys: None, allow filtering: False
NOTICE:  qual field message_guid; qual index 1; qual type <type 'unicode'>; qual operator: =; qual value 5f6ff794-bff6-4404-96ea-ed4faefb812a
NOTICE:  CQL query: SELECT "from_domain","message_guid" FROM stats.messages WHERE  message_guid = %s 
NOTICE:  executing statement...
NOTICE:  cursor got in 3.63993644714 ms
NOTICE:  qual field message_guid; qual index 1; qual type <type 'unicode'>; qual operator: =; qual value 5f6ff794-bff6-4404-96ea-ed4faefb812a
NOTICE:  CQL query: SELECT "from_domain","message_guid" FROM stats.messages WHERE  message_guid = %s 
NOTICE:  end_scan. Total time: 4.79602813721 ms
NOTICE:  pre commit
NOTICE:  commit
                                                    QUERY PLAN                                                     
-------------------------------------------------------------------------------------------------------------------
 Nested Loop  (cost=20.00..107031.40 rows=100000 width=128) (actual time=7.374..11.785 rows=2 loops=1)
   ->  Seq Scan on message p  (cost=0.00..20.70 rows=1070 width=48) (actual time=0.015..0.022 rows=2 loops=1)
   ->  Foreign Scan on messages c  (cost=20.00..100.00 rows=1 width=100) (actual time=5.846..5.873 rows=1 loops=2)
         Filter: (p.message_guid = message_guid)
         Multicorn: SELECT "from_domain","message_guid" FROM stats.messages WHERE  message_guid = %s 
         Multicorn: [UUID('5f6ff794-bff6-4404-96ea-ed4faefb812a')]
         Multicorn: ['from_domain', 'message_guid']
 Planning time: 1.027 ms
 Execution time: 12.074 ms
(9 rows)

This works also:

postgres=# explain select * from message m join fdw_stats.messages c on (m.message_guid=c.message_guid and c.message_guid='{5f6ff794-bff6-4404-96ea-ed4faefb812a}');
NOTICE:  begin: 0
NOTICE:  rowid requested
NOTICE:  path keys: [((u'message_guid',), 1), (u'message_guid', 10000), (u'from_domain', 10000), (u'__rowid__', 1)]
NOTICE:  qual field message_guid; qual index 1; qual type <type 'unicode'>; qual operator: =; qual value 5f6ff794-bff6-4404-96ea-ed4faefb812a
NOTICE:  CQL query: SELECT "from_domain","message_guid" FROM stats.messages WHERE  message_guid = %s
NOTICE:  end_scan. Total time: 0.861167907715 ms
NOTICE:  pre commit
NOTICE:  commit
                                              QUERY PLAN
------------------------------------------------------------------------------------------------------
 Nested Loop  (cost=20.15..108.18 rows=1 width=128)
   ->  Index Scan using message_pkey on message m  (cost=0.15..8.17 rows=1 width=48)
         Index Cond: (message_guid = '5f6ff794-bff6-4404-96ea-ed4faefb812a'::uuid)
   ->  Foreign Scan on messages c  (cost=20.00..100.00 rows=1 width=100)
         Filter: (message_guid = '5f6ff794-bff6-4404-96ea-ed4faefb812a'::uuid)
         Multicorn: SELECT "from_domain","message_guid" FROM stats.messages WHERE  message_guid = %s
         Multicorn: [UUID('5f6ff794-bff6-4404-96ea-ed4faefb812a')]
         Multicorn: ['from_domain', 'message_guid']
(8 rows)

Anything else I can do to pin point the cause of the problem?

Cheers,