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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Michael Reed
Your email address : reed@itd.nrl.navy.mil
Category : runtime: back-end
Severity : serious
Summary: Backend dies when run at high debug level
System Configuration
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Operating System : Solaris 2.6
PostgreSQL version : 6.4.2
Compiler used : gcc 2.8.1
Hardware:
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SunOS sun0 5.6 Generic_105181-12 sun4u sparc SUNW,Ultra-4
Sun Ultra 450 (2x300Mhz, 512MB). Also verified on Sun Ultra 2 (2x167Mhz, 256MB)
Versions of other tools:
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gmake 3.75, bison 1.25, flex 2.5.4
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Problem Description:
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Backend server dies unexpectedly when running at high debug level.
Problem not seen with no debug level specified.
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Test Case:
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Run server at debug '10' on any solaris 2.6 platform (verified on
multiple machine types).
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Solution:
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Traced it to a SEGV in postgresql-6.4.2/src/backend/nodes/outfuncs.c
in the function _outResdom (line 671). The node->resname pointer was
NULL leading to an explosion of the sprintf statement (kinda hard to
do a sprintf of a string with a null pointer as the argument :-) Quick
hack to fix is:
sprintf(buf, "\"%s\"", node->resname ? node->resname : ""); /* fix for
SELECT col AS
instead of:
sprintf(buf, "\"%s\"", node->resname); /* fix for SELECT col AS
Why/how we are actually getting a NULL pointer in that field I didn't
track down (since this hack fixed the problem).
Tried to email this report to the mailing list, but it bounced.
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