Bug 6787

We have found a memory leak in the XIO module when using the gram client and
gass server ez libraries. It appears that each time an incoming connection is
authenticated, the local credentials are read from disk but never freed. When
we eliminate all incoming connections, the memory leak vanishes.

We are observing this inside the Condor gahp_server using Globus 4.2.1. The BNL
ATLAS group has gahp_server processes that grow to over 1GB in memory usage
over the course of a day.

Here is an excerpt from valgrind:

==26280== 282,699 (2,020 direct, 280,679 indirect) bytes in 101 blocks are
definitely lost in loss record 1,384 of 2,000
==26280==    at 0x40053C0: malloc (vg_replace_malloc.c:149)
==26280==    by 0x8189E88: default_malloc_ex (mem.c:79)
==26280==    by 0x818A503: CRYPTO_malloc (mem.c:304)
==26280==    by 0x81A9C61: sk_new (stack.c:125)
==26280==    by 0x81A9C33: sk_new_null (stack.c:117)
==26280==    by 0x8131528: globus_gsi_cred_get_cert_chain
(globus_gsi_cred_handle.c:993)
==26280==    by 0x811E57C: globus_i_gsi_gss_create_cred
(globus_i_gsi_gss_utils.c:1628)
==26280==    by 0x811DF9B: globus_i_gsi_gss_cred_read
(globus_i_gsi_gss_utils.c:1401)
==26280==    by 0x811326A: gss_acquire_cred (acquire_cred.c:138)
==26280==    by 0x811C1E4: globus_i_gsi_gss_create_and_fill_context
(globus_i_gsi_gss_utils.c:364)
==26280==    by 0x8112314: gss_accept_sec_context (accept_sec_context.c:127)
==26280==    by 0x80DC927: globus_l_xio_gsi_read_token_cb
(globus_xio_gsi_driver.c:1189)
==26280==    by 0x80C41CB: globus_l_xio_driver_op_read_kickout
(globus_xio_driver.c:639)
==26280==    by 0x80D4AF1: globus_xio_driver_finished_read
(globus_xio_pass.c:1236)
==26280==    by 0x81000C4: globus_l_xio_tcp_finish_read
(globus_xio_tcp_driver.c:2249)
==26280==    by 0x810019E: globus_l_xio_tcp_system_read_cb
(globus_xio_tcp_driver.c:2265)
==26280==    by 0x81076F5: globus_l_xio_system_kickout
(globus_xio_system_select.c:919)
==26280==    by 0x814BD72: globus_callback_space_poll
(globus_callback_nothreads.c:1437)
==26280==    by 0x809381B: main (gahp_server.c:1946)