Re: Segfault Exiting psql - Mailing list pgsql-hackers

David Wheeler <david@justatheory.com> writes:
> 8.0.3 is working great for me on Mac OS X Tiger, but I do get a  
> segfault every time I exit pssql:

> psql(7466) malloc: *** error for object 0x1806600: incorrect checksum  
> for freed object - object was probably modified after being freed,  
> break at szone_error to debug
> psql(7466) malloc: *** set a breakpoint in szone_error to debug
> zsh: segmentation fault  /usr/local/pgsql/bin/psql -U postgres -d sharky

> Anyone seen this before? Compiled with gcc 4.0 (Apple's).

Hmm, I don't see that symptom, but I do see some strange stuff building
PG CVS tip on a fully-up-to-date (10.4.2) OS X machine.  First off,
a lot of duplicate-symbol build warnings, eg while linking pg_dump:

usr/bin/ld: warning multiple definitions of symbol _pg_toupper
../../../src/port/libpgport.a(pgstrcasecmp.o) definition of _pg_toupper in section (__TEXT,__text)
../../../src/interfaces/libpq/libpq.dylib(pgstrcasecmp.o) definition of _pg_toupper
/usr/bin/ld: warning multiple definitions of symbol _pg_strncasecmp
../../../src/port/libpgport.a(pgstrcasecmp.o) definition of _pg_strncasecmp in section (__TEXT,__text)
../../../src/interfaces/libpq/libpq.dylib(pgstrcasecmp.o) definition of _pg_strncasecmp
/usr/bin/ld: warning multiple definitions of symbol _pg_strcasecmp
../../../src/port/libpgport.a(pgstrcasecmp.o) definition of _pg_strcasecmp in section (__TEXT,__text)
../../../src/interfaces/libpq/libpq.dylib(pgstrcasecmp.o) definition of _pg_strcasecmp
/usr/bin/ld: warning multiple definitions of symbol _pg_tolower
../../../src/port/libpgport.a(pgstrcasecmp.o) definition of _pg_tolower in section (__TEXT,__text)
../../../src/interfaces/libpq/libpq.dylib(pgstrcasecmp.o) definition of _pg_tolower
/usr/bin/ld: warning multiple definitions of symbol _pqStrerror
../../../src/port/libpgport.a(thread.o) definition of _pqStrerror in section (__TEXT,__text)
../../../src/interfaces/libpq/libpq.dylib(thread.o) definition of _pqStrerror
/usr/bin/ld: warning multiple definitions of symbol _pqGetpwuid
../../../src/port/libpgport.a(thread.o) definition of _pqGetpwuid in section (__TEXT,__text)
../../../src/interfaces/libpq/libpq.dylib(thread.o) definition of _pqGetpwuid

This noise wasn't there ever before; I do not know if it's just that
Apple's tools got pickier recently, or if we've broken something.

Second, at exit from an interactive psql session,

regression=# \q
could not save history to file "/Users/tgl/.psql_history": Invalid argument
$

The file is written, but it seems not to contain the expected contents.
This might be the fault of my not-so-up-to-date readline library.
Not sure if your symptom could also be blamed on readline --- have you
tried getting a stack trace from the crash?
        regards, tom lane