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SIMILAR-TO leads FB to crash when checking blob with size > 2Gb for matching to string literal [CORE4893] #5186

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firebird-issue-importer opened this issue Jul 30, 2015 · 8 comments

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@firebird-issue-importer

Submitted by: @pavel-zotov

Doing on LI-V3.0.0.31942 SuperClassic, database with FW = OFF, FB config:

Servermode = SuperClassic
RemoteServicePort = 3330
DefaultDbCachePages = 512

BugCheckAbort=1

AuthClient = Legacy_Auth,Srp,Win_Sspi
AuthServer = Legacy_Auth,Srp
UserManager = Legacy_UserManager
WireCrypt = Disabled

ExternalFileAccess = Restrict /var/db/fb30
FileSystemCacheThreshold = 65536K

LockMemSize = 64M
LockHashSlots = 22111

MaxUserTraceLogSize = 99999
TempCacheLimit = 2147483647
#⁠TempDirectories = /dev/shm;/tmp
TempDirectories = /tmp/firebird

Test:
#⁠#⁠#⁠#⁠

recreate global temporary table gtt(b blob);
recreate sequence g;
commit;
insert into gtt(b) select list( gen_id( g, 1 ) )
from rdb$types,rdb$types,rdb$types,(select 1 k from rdb$types rows 15);
select char_length(b) from gtt;

      CHAR\_LENGTH

=====================
2346948497

SQL> select gen_id(g,0) from rdb$database;

           GEN\_ID

=====================
245805960

SQL> select 1 from gtt where b like '%,245805959,%';

CONSTANT

============
1

SQL> select 1 from gtt where b similar to '%,2,%'; ----------- worked VERY slowly, was interrupted by Ctrl-C
^C
CONSTANT

Statement failed, SQLSTATE = HY008
operation was cancelled
SQL> select 1 from gtt where b similar to '%,2,%'; ---------- was NOT interrupted, but after ~2 minutes produced:

CONSTANT

============
Statement failed, SQLSTATE = 08006
Error reading data from the connection.

Result is reproduced also if cancel last query by Ctrl-C -- see two attached files with stack-trace.

Commits: 28e1874

====== Test Details ======

Test can not be implemented because of huge size of data (more than 2 Gb).
I've cheched on WI-T4.0.0.1598 (08-sep-2019) and got following results:

select 1 from gtt where b like '%,245805959,%';

       1

Current memory = 182333584
Delta memory = 3520
Max memory = 182415760
Elapsed time = 36.354 sec
Buffers = 20000
Reads = 408126
Writes = 19886
Fetches = 815853

select 2 from gtt where b similar to '%,2,%'; -- worked VERY slowly, was interrupted by Ctrl-C

       2

Current memory = 4477299296
Delta memory = 4294965712
Max memory = 6624792864
Elapsed time = 51.449 sec
Buffers = 20000
Reads = 607589
Writes = 0
Fetches = 1214585

select 3 from gtt where b similar to '%,2,%'; -- was NOT interrupted, but after ~2 minutes produced: Error reading data from the connection.

       3

Current memory = 4477299296
Delta memory = 0
Max memory = 6624792864
Elapsed time = 69.458 sec
Buffers = 20000
Reads = 607589
Writes = 0
Fetches = 1214585

So, the problem was gone.

@firebird-issue-importer
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@firebird-issue-importer firebird-issue-importer commented Jul 30, 2015

Commented by: @pavel-zotov

Link to .zip with stack-traces: https://yadi.sk/d/vY0KnR4LiBP4c

0xFF. Last time something wrong occurs with ability to attach files: I permanently get error from JIRA.

@firebird-issue-importer
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@firebird-issue-importer firebird-issue-importer commented Jul 30, 2015

Commented by: @dyemanov

I'd say that built-in functions are not always expected to work with blobs > 2GB. That said, the server surely should not crash but report an error.

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@firebird-issue-importer firebird-issue-importer commented Dec 18, 2015

Commented by: @dyemanov

Did you check against v2.5? I doubt this is a v3 regression.

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@firebird-issue-importer firebird-issue-importer commented Dec 18, 2015

Commented by: @pavel-zotov

Something weird one may to see in FB 2.5.5.
Script (run this on new empty database):

===
set bail on;
set term ^;
execute block as
begin
execute statement 'drop sequence g';
when any do begin end
end
^
set term ;^
commit;
create sequence g;
recreate global temporary table gtt(b blob);
commit;
set bail off;

set list on;
select current_timestamp as dts_beg from rdb$database;
set echo on;
set stat on;
insert into gtt(b) select list( gen_id( g, 1 ) ) from rdb$types,rdb$types,rdb$types,(select 1 k from rdb$types rows 20);
set stat off;
select current_timestamp as dts_end from rdb$database;

Its STDOUT & STDERR will be:

$ /opt/fb25sc/bin/isql /3255:/var/db/fb25/e25.fdb -i qq.sql

DTS_BEG 2015-12-18 15:06:05.6770

set stat on;
insert into gtt(b) select list( gen_id( g, 1 ) ) from rdb$types,rdb$types,rdb$types,(select 1 k from rdb$types rows 20);
Statement failed, SQLSTATE = 08001
I/O error during "open O_CREAT" operation for file ""
-Error while trying to create file
-No such file or directory
After line 19 in file qq.sql
Current memory = 10311184
Delta memory = 274920
Max memory = 10323632
Elapsed time= 242.37 sec
Cpu = 0.00 sec
Buffers = 2048
Reads = 802
Writes = 787696
Fetches = 727872092
set stat off;
select current_timestamp as dts_end from rdb$database;

DTS_END 2015-12-18 15:10:08.0430

Firstly I've thought that there is no space for GTT data - but:

$ env|grep -i "firebird\|tmp\|temp"
MC_TMPDIR=/tmp/mc-root
FIREBIRD_TMP=/tmp/firebird

$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda4 243G 49G 182G 22% /
tmpfs 16G 0 16G 0% /dev/shm
/dev/sda2 194M 50M 135M 28% /boot
/dev/sda1 200M 260K 200M 1% /boot/efi
/dev/sdb1 275G 199G 63G 77% /u01
192.168.0.61:/u01/u4backupset/RACDB
1.3T 797G 378G 68% /u4bkp_RACDB

So, 182 G - it should be enough for storing such blob (IMO).

Database has size about 3 Gb when this fault has occured:

$ ls -l /var/db/fb25/e25.fdb
-rw-r----- 1 firebird firebird 3277156352 Dec 18 15:17 /var/db/fb25/e25.fdb

Trace:

2015-12-18T15:10:08.0420 (551:0x7f819f2357a0) FAILED EXECUTE_STATEMENT_FINISH
/var/db/fb25/e25.fdb (ATT_3, SYSDBA:NONE, NONE, TCPv4:192.168.0.220)
/opt/fb25sc/bin/isql:549
(TRA_10, CONCURRENCY | WAIT | READ_WRITE)

Statement 87:
-------------------------------------------------------------------------------
insert into gtt(b) select list( gen_id( g, 1 ) ) from rdb$types,rdb$types,rdb$types,(select 1 k from rdb$types rows 20)
0 records fetched
242364 ms, 800 read(s), 787696 write(s), 727871981 fetch(es), 240202496 mark(s)

Table Natural Index Update Insert Delete Backout Purge Expunge
***************************************************************************************************************
RDB$TYPES 238091300

2015-12-18T15:10:08.0420 (551:0x7f819f2357a0) ERROR AT jrd8_execute
/var/db/fb25/e25.fdb (ATT_3, SYSDBA:NONE, NONE, TCPv4:192.168.0.220)
/opt/fb25sc/bin/isql:549
335544344 : I/O error during "open O_CREAT" operation for file ""
335544733 : Error while trying to create file
2 : No such file or directory

PS.
ISQL Version: LI-V2.5.6.26958 Firebird 2.5
Server version:
LI-V2.5.6.26958 Firebird 2.5
LI-V2.5.6.26958 Firebird 2.5/tcp (oel64)/P12
LI-V2.5.6.26958 Firebird 2.5/tcp (oel64)/P12

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@firebird-issue-importer firebird-issue-importer commented Dec 18, 2015

Commented by: @pavel-zotov

PPS. Sorry, I forgot to show my firebird.conf:

$ cat firebird.conf

RemoteServicePort = 3255

DefaultDbCachePages = 2048
LockHashSlots = 22111

ExternalFileAccess = Restrict /var/db/fb25
TempDirectories = /dev/shm;/tmp
MaxUserTraceLogSize = 99999
FileSystemCacheThreshold = 1000000
TempCacheLimit = 2147483647

NB:
TempDirectories = /dev/shm;/tmp -- here '/dev/shm' is at the start of list. This device has capacity = 16 Gb.
But (AFAIK) GTT data are stored exactly in the folder which is defined by env. FIREBIRD_TMP=/tmp/firebird -- am I right ?

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@firebird-issue-importer firebird-issue-importer commented Sep 6, 2019

Modified by: @asfernandes

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

Fix Version: 4.0 Beta 2 [ 10888 ]

assignee: Adriano dos Santos Fernandes [ asfernandes ]

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@firebird-issue-importer firebird-issue-importer commented Sep 8, 2019

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Resolved [ 5 ]

QA Status: No test => Cannot be tested

Test Details: Test can not be implemented because of huge size of data (more than 2 Gb).
I've cheched on WI-T4.0.0.1598 (08-sep-2019) and got following results:

select 1 from gtt where b like '%,245805959,%';

       1

Current memory = 182333584
Delta memory = 3520
Max memory = 182415760
Elapsed time = 36.354 sec
Buffers = 20000
Reads = 408126
Writes = 19886
Fetches = 815853

select 2 from gtt where b similar to '%,2,%'; -- worked VERY slowly, was interrupted by Ctrl-C

       2

Current memory = 4477299296
Delta memory = 4294965712
Max memory = 6624792864
Elapsed time = 51.449 sec
Buffers = 20000
Reads = 607589
Writes = 0
Fetches = 1214585

select 3 from gtt where b similar to '%,2,%'; -- was NOT interrupted, but after ~2 minutes produced: Error reading data from the connection.

       3

Current memory = 4477299296
Delta memory = 0
Max memory = 6624792864
Elapsed time = 69.458 sec
Buffers = 20000
Reads = 607589
Writes = 0
Fetches = 1214585

So, the problem was gone.

@firebird-issue-importer
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@firebird-issue-importer firebird-issue-importer commented Sep 8, 2019

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Closed [ 6 ]

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