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memory corruption bug

From: Alan Stange <stange(at)rentec(dot)com>
To: pgsql-bugs(at)postgresql(dot)org
Subject: memory corruption bug
Date: 2004-03-30 15:40:22
Message-ID: 406994E6.mailxM3Z11IURX@monstert25 (view raw or flat)
Thread:
Lists: pgsql-bugs
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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name		:Alan Stange
Your email address	:stange(at)rentec(dot)com	


System Configuration
---------------------
  Architecture (example: Intel Pentium)  	: Sun UltraSparc IIICu

  Operating System (example: Linux 2.4.18) 	: Solaris 9

  PostgreSQL version (example: PostgreSQL-7.4.1):   PostgreSQL-7.4.1

  Compiler used (example:  gcc 2.95.2)		: Sun spro9.  


Please enter a FULL description of your problem:
------------------------------------------------
There's memory corruption occuring causing the malloc routines to SIGBUS.   This is typically caused
by a routine overwriting the end of malloc()'d memory causing corruption to the meta data used by malloc(), 
free(), realloc(), etc.

We have this happen about once / day.

program terminated by signal BUS (invalid address alignment)
0xff043694: realfree+0x023c:    ld       [%o2 + 8], %o0
(dbx) where
=>[1] realfree(0x703b50, 0x782c0, 0x51, 0xff0bc000, 0x3c, 0x18cf08), at 0xff043694
  [2] cleanfree(0x0, 0x9, 0xff0c26ec, 0x10018, 0x703b50, 0x0), at 0xff043d90
  [3] _malloc_unlocked(0x20018, 0x79270, 0x0, 0xff0bc000, 0x0, 0x0), at 0xff042ebc
  [4] malloc(0x20018, 0x20007, 0x0, 0x0, 0x0, 0x0), at 0xff042dac
  [5] AllocSetAlloc(0x5cadf8, 0x20000, 0x0, 0x0, 0x0, 0x2000), at 0x24fdfc
  [6] AllocSetRealloc(0x5cadf8, 0x604608, 0x20000, 0x604608, 0x2000, 0x604600), at 0x25053c
  [7] enlargeStringInfo(0xffbfed48, 0x10473, 0x20000, 0x10474, 0x100, 0x1), at 0x10fb10
  [8] pq_getmessage(0xffbfed48, 0x0, 0x0, 0x0, 0x2ff910, 0x604608), at 0x1181bc
  [9] SocketBackend(0xffbfed48, 0x310400, 0x51, 0x30000, 0x3c, 0x18cf08), at 0x18d2bc
  [10] PostgresMain(0x190400, 0x310c00, 0x1, 0x315000, 0x310c00, 0x1), at 0x19193c
  [11] BackendFork(0x364b18, 0x356848, 0x2d043c, 0x2d044c, 0x310400, 0x319958), at 0x15b988
  [12] BackendStartup(0x364b18, 0x7f7f7c00, 0x7f7f7c00, 0x3541d8, 0x6e0c3a8f, 0x349c00), at 0x15b170
  [13] ServerLoop(0xc0, 0x310640, 0x364b18, 0x320e64, 0x1, 0x1), at 0x159814
  [14] PostmasterMain(0x15b800, 0x15a500, 0xffffffff, 0x349000, 0x354000, 0x315000), at 0x159048
  [15] main(0x1, 0x35608c, 0x3543d8, 0x3541d8, 0x0, 0x278), at 0x119bf4


These bugs are hard to fix.  The actual corruption could have occured much earlier in the execution.

We had the same error with the gcc compilers as well.  We're using the Sun compilers as the resulting
PG binaries are much faster.


Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible: 
----------------------------------------------------------------------
Sadly, we have no reproducible test case right now.  




If you know how this problem might be fixed, list the solution below:
---------------------------------------------------------------------

Typically one would use a tool like purify, bcheck, etc., to find the offending code.


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Subject: psql: relocation error: psql: undefined

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