BUG #5589: psql dies with bad free() in libedit

The following bug has been logged online:

Bug reference: 5589
Logged by: Steve Atkins
Email address: steve@blighty.com
PostgreSQL version: 9.0beta3
Operating system: OS X
Description: psql dies with bad free() in libedit
Details:

I have a database that contains two tables (partminer and partminer2), and
two sequences (partminer2_id_seq and partminer_pk), on a 9.0beta3
installation built from source with default configure options.

The database was corrupted (cable for an external drive fell out), but
apparently recovered fine on restart.

From psql, entering "\d p<tab>" works as expected. Entering "\d pa<tab>"
throws an abort from malloc(): "malloc: *** error for object 0x3: pointer
being freed was not allocated", with the error within libedit.

Process: psql [39127]
Path: /Volumes/G-RAID/pgsql/bin/psql
Identifier: psql
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: bash [38218]

Date/Time: 2010-08-01 21:12:06.523 -0700
OS Version: Mac OS X 10.6.4 (10F569)
Report Version: 6

Interval Since Last Report: 187973 sec
Crashes Since Last Report: 12
Per-App Crashes Since Last Report: 11
Anonymous UUID: 1FE5E5C3-10D8-4225-B3F2-7AD2A0E5B4A3

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Application Specific Information:
abort() called

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libSystem.B.dylib 0x00007fff874543d6 __kill + 10
1 libSystem.B.dylib 0x00007fff874f4972 abort + 83
2 libSystem.B.dylib 0x00007fff8740c615 free + 128
3 libedit.2.dylib 0x00000001000899a8 fn_complete + 659
4 libedit.2.dylib 0x000000010008f416 rl_complete + 182
5 libedit.2.dylib 0x000000010008f428 rl_complete + 200
6 libedit.2.dylib 0x000000010008db87 el_gets + 709
7 libedit.2.dylib 0x000000010008f9bf readline + 279
8 psql 0x00000001000087cf gets_interactive + 79
9 psql 0x000000010000c22b MainLoop + 539
10 psql 0x000000010000e924 main + 2964
11 psql 0x0000000100001524 start + 52

Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000000000000002 rcx: 0x00007fff5fbfeeb8
rdx: 0x0000000000000000
rdi: 0x00000000000098d7 rsi: 0x0000000000000006 rbp: 0x00007fff5fbfeed0
rsp: 0x00007fff5fbfeeb8
r8: 0x0000000000000e03 r9: 0x0000000000000000 r10: 0x00007fff87450412
r11: 0x0000000000000202
r12: 0x00000001000cf000 r13: 0x00000001000cd000 r14: 0x0000000000000000
r15: 0x0000000000000001
rip: 0x00007fff874543d6 rfl: 0x0000000000000202 cr2: 0x00000001000ed000

Binary Images:
0x100000000 - 0x100051ff7 +psql ??? (???)
<9D94BB44-2BF0-1B3E-6CC9-2BA515E0606D> /Volumes/G-RAID/pgsql/bin/psql
0x100062000 - 0x10007dff7 +libpq.5.dylib 5.3.0 (compatibility
5.0.0) <12AF8A1A-F17B-4A97-32E6-FD7EB8008A59>
/Volumes/G-RAID/pgsql/lib/libpq.5.dylib
0x100085000 - 0x1000a1fe7 libedit.2.dylib 2.11.0
(compatibility 2.0.0) <EAF4D57B-1ADC-06CF-DAC7-72AF835140FD>
/usr/lib/libedit.2.dylib
0x7fff5fc00000 - 0x7fff5fc3bdef dyld 132.1 (???)
<B536F2F1-9DF1-3B6C-1C2C-9075EA219A06> /usr/lib/dyld
0x7fff82551000 - 0x7fff82555ff7 libmathCommon.A.dylib 315.0.0
(compatibility 1.0.0) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5>
/usr/lib/system/libmathCommon.A.dylib
0x7fff82b78000 - 0x7fff82bb7fef libncurses.5.4.dylib 5.4.0
(compatibility 5.4.0) <E1F34D53-3D62-78C0-CAD8-8AD22C110A9E>
/usr/lib/libncurses.5.4.dylib
0x7fff87405000 - 0x7fff875c5fef libSystem.B.dylib 125.2.0
(compatibility 1.0.0) <95E02DD0-ADEA-745B-E7FA-ABA064E4658C>
/usr/lib/libSystem.B.dylib
0x7fffffe00000 - 0x7fffffe01fff libSystem.B.dylib ??? (???)
<95E02DD0-ADEA-745B-E7FA-ABA064E4658C> /usr/lib/libSystem.B.dylib