Re: [HACKERS] Block level parallel vacuum

Hi,

While testing this feature with parallel vacuum on "TEMPORARY TABLE", I got a server crash on PG Head+V36_patch.
Changed configuration parameters and Stack trace are as below:

autovacuum = on  
max_worker_processes = 4
shared_buffers = 10MB
max_parallel_workers = 8
max_parallel_maintenance_workers = 8
vacuum_cost_limit = 2000
vacuum_cost_delay = 10
min_parallel_table_scan_size = 8MB
min_parallel_index_scan_size = 0

-- Stack trace:
[centos@parallel-vacuum-testing bin]$ gdb -q -c data/core.1399 postgres
Reading symbols from /home/centos/BLP_Vacuum/postgresql/inst/bin/postgres...done.
[New LWP 1399]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `postgres: autovacuum worker   postgres                      '.
Program terminated with signal 6, Aborted.
#0  0x00007f4517d80337 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install glibc-2.17-292.el7.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.15.1-37.el7_7.2.x86_64 libcom_err-1.42.9-16.el7.x86_64 libgcc-4.8.5-39.el7.x86_64 libselinux-2.5-14.1.el7.x86_64 openssl-libs-1.0.2k-19.el7.x86_64 pcre-8.32-17.el7.x86_64 zlib-1.2.7-18.el7.x86_64
(gdb) bt
#0  0x00007f4517d80337 in raise () from /lib64/libc.so.6
#1  0x00007f4517d81a28 in abort () from /lib64/libc.so.6
#2  0x0000000000a96341 in ExceptionalCondition (conditionName=0xd18efb "strvalue != NULL", errorType=0xd18eeb "FailedAssertion",
    fileName=0xd18ee0 "snprintf.c", lineNumber=442) at assert.c:67
#3  0x0000000000b02522 in dopr (target=0x7ffdb0e38450, format=0xc5fa95 ".%s\"", args=0x7ffdb0e38538) at snprintf.c:442
#4  0x0000000000b01ea6 in pg_vsnprintf (str=0x256df50 "autovacuum: dropping orphan temp table \"postgres.", '\177' <repeats 151 times>..., count=1024,
    fmt=0xc5fa68 "autovacuum: dropping orphan temp table \"%s.%s.%s\"", args=0x7ffdb0e38538) at snprintf.c:195
#5  0x0000000000afbadf in pvsnprintf (buf=0x256df50 "autovacuum: dropping orphan temp table \"postgres.", '\177' <repeats 151 times>..., len=1024,
    fmt=0xc5fa68 "autovacuum: dropping orphan temp table \"%s.%s.%s\"", args=0x7ffdb0e38538) at psprintf.c:110
#6  0x0000000000afd34b in appendStringInfoVA (str=0x7ffdb0e38550, fmt=0xc5fa68 "autovacuum: dropping orphan temp table \"%s.%s.%s\"", args=0x7ffdb0e38538)
    at stringinfo.c:149
#7  0x0000000000a970fd in errmsg (fmt=0xc5fa68 "autovacuum: dropping orphan temp table \"%s.%s.%s\"") at elog.c:832
#8  0x00000000008588d2 in do_autovacuum () at autovacuum.c:2249
#9  0x0000000000857b29 in AutoVacWorkerMain (argc=0, argv=0x0) at autovacuum.c:1689
#10 0x000000000085772f in StartAutoVacWorker () at autovacuum.c:1483
#11 0x000000000086e64f in StartAutovacuumWorker () at postmaster.c:5562
#12 0x000000000086e106 in sigusr1_handler (postgres_signal_arg=10) at postmaster.c:5279
#13 <signal handler called>
#14 0x00007f4517e3f933 in __select_nocancel () from /lib64/libc.so.6
#15 0x0000000000869838 in ServerLoop () at postmaster.c:1691
#16 0x0000000000869212 in PostmasterMain (argc=3, argv=0x256bd70) at postmaster.c:1400
#17 0x000000000077855d in main (argc=3, argv=0x256bd70) at main.c:210
(gdb)

I have tried to reproduce the same with all previously executed queries but now I am not able to reproduce the same.