An INSERT can kill the PostgreSQL server
Your name : Richi Plana
Your email address : richip@mozcom.com
System Configuration
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Architecture (example: Intel Pentium) : Intel PentiumIII-500
Operating System (example: Linux 2.0.26 ELF) : Linux 2.2.15 ELF
PostgreSQL version (example: PostgreSQL-6.5.1): PostgreSQL-7.0
Compiler used (example: gcc 2.8.0) : gcc 2.91.66
Please enter a FULL description of your problem:
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While INSERTing a row into a TABLE, the backend would die and restart
Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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Table defs:
create table devices (brand varchar(30), model varchar(30), serial
varchar(30), ro_community varchar(50)[], rw_community varchar(50)[], primary
key (brand, model, serial));
create table routers (lo_address inet) inherits (devices);
Query:
insert into routers values ('Cisco', '7206VXR', '72498595', '{"Butterflies",
"Intehsoijfeijfjf"}', NULL, '10.2.3.4');
If you know how this problem might be fixed, list the solution below:
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--
L L Richi Plana, CCNA 8^) ,-,-. ,-,-. ,-,-. ,-,-. ,-
LL LL Systems Administrator / / \ \ / / \ \ / / \ \ / / \ \ / /
LLLLL Mosaic Communications, Inc. \ \ / / \ \ / / \ \ / / \ \ / /
LLLLL mailto:richip@mozcom.com `-'-' `-'-' `-'-' `-'-'
Richi Plana <richip@mozcom.com> writes:
create table devices (brand varchar(30), model varchar(30), serial
varchar(30), ro_community varchar(50)[], rw_community varchar(50)[], primary
key (brand, model, serial));
create table routers (lo_address inet) inherits (devices);
insert into routers values ('Cisco', '7206VXR', '72498595', '{"Butterflies",
"Intehsoijfeijfjf"}', NULL, '10.2.3.4');
Hmm. Looks like there is some kind of unpleasant interaction between
the constant-expression simplifier and application of array-element
length constraints. Thanks for the report, I'll look into it today.
If you are in a *big* hurry, I expect declaring rw_community as
text[] would avoid the bug.
regards, tom lane
Richi Plana <richip@mozcom.com> writes:
create table devices (brand varchar(30), model varchar(30), serial
varchar(30), ro_community varchar(50)[], rw_community varchar(50)[], primary
key (brand, model, serial));
create table routers (lo_address inet) inherits (devices);
insert into routers values ('Cisco', '7206VXR', '72498595', '{"Butterflies",
"Intehsoijfeijfjf"}', NULL, '10.2.3.4');
Ah, I see it: it's the NULL array value that is causing the problem.
6.5 parser didn't really handle the NULL properly, but 7.0's does:
it tries to apply array_map() to the NULL to ensure it's coerced to
50-chars-per-item length limit. Which means array_map had better be
NULL-proof.
This patch is applied for 7.0.1, but if you need a fix now:
*** src/backend/utils/adt/arrayfuncs.c~ Wed Jan 26 00:57:12 2000
--- src/backend/utils/adt/arrayfuncs.c Sun May 28 13:43:34 2000
***************
*** 1308,1313 ****
--- 1308,1317 ----
char *s;
char *p;
va_list ap;
+
+ /* Need to guard against NULL input array */
+ if (v == NULL)
+ return NULL; /* Large objects not yet supported */
if (ARR_IS_LO(v) == true)
regards, tom lane