wtperf -h /tmp/WT_TEST
-O /b/bostic/wiredtiger/bench/wtperf/runners/update-checkpoint-btree.wtperf
sweep-server: ../src/conn/conn_dhandle.c, 647: !final || ret == 0

(gdb) where
WT-6  0x0000000000481df3 in __wt_conn_dhandle_discard_single (
    session=0x802537000, dhandle=0x803647400, final=1)
    at ../src/conn/conn_dhandle.c:647
WT-7  0x0000000000481e58 in __wt_conn_dhandle_discard (conn=0x80250ce00)
    at ../src/conn/conn_dhandle.c:677
WT-8  0x000000000041209a in __wt_connection_close (conn=0x80250ce00)
    at ../src/conn/conn_open.c:92
WT-9  0x000000000040d2c9 in __conn_close (wt_conn=0x80250ce00, config=0x0)
    at ../src/conn/conn_api.c:573
WT-10 0x0000000000409cce in start_run (cfg=0x7fffffffd730)
    at ../../../bench/wtperf/wtperf.c:1869
WT-11 0x000000000040923b in start_all_runs (cfg=0x7fffffffd730)
    at ../../../bench/wtperf/wtperf.c:1652
WT-12 0x000000000040a745 in main (argc=5, argv=0x7fffffffd950)
    at ../../../bench/wtperf/wtperf.c:2086
(gdb) p final
$6 = 1
(gdb) p ret
$7 = 16
(gdb) p *dhandle
$8 = {rwlock = 0x80341d0c0, l = {sle_next = 0x8025a3400}, session_ref = 0, 
  session_inuse = 0, timeofdeath = 1402609850, 
  name_hash = 9596272081698085885, name = 0x80341d0d0 "file:test.wt", 
  checkpoint = 0x0, cfg = 0x80341e060, dsrc = 0x0, handle = 0x803667140,
{ statistics }, flags = 32}