segfaults

Hey folks,

I've had some random segfaults in psycopg over the last week in a few
systems. Previously they've been fine, and other systems configured
the same run fine. Building a small testcase is tricky, the problem
comes and goes and there's a number of other C modules loaded in the
application. So, I'm looking for ideas. We're running psycopg2 from
r921 under Python2.5, on Ubuntu Feisty under amd64 & i386 (errors
occur on both) against Postgres8.2.

Traceback is below. #1/#2 is interesting, line 701 of pqpath suggests
PyTuple_New() should be called with size=7 statically.

Ringing any bells for anyone?

Rob :)

Program terminated with signal 11, Segmentation fault.
#0  PyErr_Occurred () at ../Python/errors.c:77
#1  0x080997ea in PyTuple_New (size=144071552) at ../Objects/tupleobject.c:68
#2  0xb7b225ef in _pq_fetch_tuples (curs=0x87aa978) at psycopg/pqpath.c:701
#3  0xb7b2391d in pq_fetch (curs=0x87aa978) at psycopg/pqpath.c:1115
#4  0xb7b22393 in pq_execute (curs=0x87aa978,
    query=0x88dc5f4 "\n", ' ' <repeats 14 times>, "SELECT conname,
pg_catalog.pg_get_constraintdef(oid, true) as condef \n", ' ' <repeats
14 times>, "FROM  pg_catalog.pg_constraint r \n", ' ' <repeats 14
times>, "WHERE r.conrelid = 33149 AND r.contype = 'f' \n       "...,
async=0)
    at psycopg/pqpath.c:630
#5  0xb7b2a705 in _psyco_curs_execute (self=0x87aa978,
operation=0x88dc490, vars=0x87e713c, async=0) at
psycopg/cursor_type.c:428
#6  0xb7b2a995 in psyco_curs_execute (self=0x87aa978, args=0x87fb4ec,
kwargs=0x0) at psycopg/cursor_type.c:483
#7  0x080c8a7c in PyEval_EvalFrameEx (f=0x88d68ec, throwflag=0) at
../Python/ceval.c:3564
#8  0x080c9ca5 in PyEval_EvalCodeEx (co=0x86f5140, globals=0x86f224c,
locals=0x0, args=0x88d68b4, argcount=4, kws=0x88d68c4, kwcount=1,
    defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:2831
#9  0x080c8169 in PyEval_EvalFrameEx (f=0x88d6764, throwflag=0) at
../Python/ceval.c:3660
#10 0x080c9ca5 in PyEval_EvalCodeEx (co=0x86e6260, globals=0x86de79c,
locals=0x0, args=0x88d6714, argcount=4, kws=0x88d6724, kwcount=1,
    defs=0x86eafd8, defcount=1, closure=0x0) at ../Python/ceval.c:2831